TEXAS INSTRUMENTS UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44 Technical data

UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45 UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45

SLUS458E -- AUGUST 2001 -- REVISED OCTOBER 2010

BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLER

FEATURES

D Enhanced Replacement for UC3842A Family

With Pin-to-Pin Compatibility

D 1-MHz Operation D 50-μA Standby Current, 100-μA Maximum D Low Operating Current of 2.3 mA at 52 kHz D Fast 35-ns Cycle-by-Cycle Overcurrent

Limiting

D ±1-A Peak Output Current D Rail-to-Rail Output Swings with 25-ns Rise

and 20-ns Fall Times

D ±1% Initial Trimmed 2.5-V Error Amplifier

Reference

D Trimmed Oscillator Discharge Current D New Under Voltage Lockout Versions D MSOP-8 Package Minimizes Board Space

APPLICATIONS

D Switch-Mode Power Supplies D dc-to-dc Converters D Board Mount Power Modules

DESCRIPTION

UCC38C4x family is a high-performance currentmode PWM controller. It is an enhanced BiCMOS version with pin-for-pin compatibility to the industry standard UC384xA family and UC384x family of PWM controllers. In addition, lower startup voltage versions of 7 V are offered as UCC38C40 and UCC38C41.

Providing necessary features to control fixed frequency, peak current-mode power supplies, this family offers the following performance advantages. The device offers high-frequency operation up to 1 MHz with low start-up and operating currents, thus minimizing start-up loss and low operating power consumption for improved efficiency. The device also features a very fast current-sense-to-output delay time of 35 ns and a ±1 A peak output current capability with improved rise and fall times for driving large external MOSFETs directly.

The UCC38C4x family is offered in 8-pin packages, MSOP (DGK), SOIC (D) and PDIP (P).

FUNCTIONAL BLOCK DIAGRAM

5.0 V

8

4

RT/CT

2.5 V +

2

FB

1COMP

3CS

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications ofTexas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

VREF

ERROR AMP

Note: Toggle flip--flop used only in UCC38C41, UCC38C44, and UCC38C45.

OSC

2R

VREF

GOOD LOGIC

R

1V

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UVLO

+

(NOTE)

T

SQ

7VREF

VDD

+

QR

5GND

6OUT

UDG--99139

1

UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45

0Cto70C

UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45

SLUS458E -- AUGUST 2001 -- REVISED OCTOBER 2010

recommended operating conditions

MIN MAX UNIT

Input voltage, V

Output voltage range, V

Average output current, I

Reference output current, I

Operating junction temperature, T

¶

It is not recommended that the device operate under conditions beyond those specified in this table for extended periods of time.

DD

OUT

W

OUT(ref)

W

J

-- 4 0 105 °C

18 V

200 mA

-- 2 0 mA

absolute maximum ratings over operating free-air temperature (unless otherwise noted)

}w

Supply voltage (VDD) 20 V......................................................................

(MAX ICC) 30 mA..................................................................

Output current, I

peak ±1A...................................................................

OUT

Output energy, capacitive load 5 μJ...............................................................

Voltage rating (COMP, CS, FB) --0.3 V to 6.3 V....................................................

(OUT) --0.3 V to 20 V...............................................................

(RT/CT) --0.3 V to 6.3 V............................................................

(VREF) 7V.......................................................................

Error amplifier output sink current 10 mA..........................................................

Total Power Dissipation at T

=25°C: D package 50 °C/W..........................................

A

DGK package 120°C/W......................................

P package 65°C/W..........................................

Operating junction temperature range, T Storage temperature range T

stg

J

-- 5 5 °C to 150°C...........................................

-- 6 5 °C to 150°C....................................................

Lead Temperature (Soldering, 10 seconds) 300°C..................................................

‡

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

§

All voltages are with respect to ground. Currents are positive into and negative out of the specified terminals. Consult the Packaging Section of the Databook for thermal limitations and considerations of the package.

AVAILABLE OPTIONS

T

A=TJ

°

-- 4 0 °C to 105°C

0°Cto70°C

†

D (SOIC--8) and DGK (MSOP--8) packages are available taped and reeled. Add R suffix to device type (e.g. UCC28C42DR) to order quantities of 2500 devices per reel. Tube quantities are 75 for D packages (SOIC--8) and 80 for DGK package (MSOP--8), and 50 for P package (PDIP-8).

MAXIMUM

DUTY CYCLE

100%

°

50%

100%

50%

UVLO

ON/OFF

14.5V / 9.0V UCC28C42D UCC28C42P UCC28C42DGK

8.4V / 7.6V UCC28C43D UCC28C43P UCC28C43DGK

7.0V / 6.6V UCC28C40D UCC28C40P UCC28C40DGK

14.5V / 9.0V UCC28C44D UCC28C44P UCC28C44DGK

8.4V / 7.6V UCC28C45D UCC28C45P UCC28C45DGK

7.0V / 6.6V UCC28C41D UCC28C41P UCC28C41DGK

14.5V / 9.0V UCC38C42D UCC38C42P UCC38C42DGK

8.4V / 7.6V UCC38C43D UCC38C43P UCC38C43DGK

7.0V / 6.6V UCC38C40D UCC38C40P UCC38C40DGK

14.5V / 9.0V UCC38C44D UCC38C44P UCC38C44DGK

8.4V / 7.6V UCC38C45D UCC38C45P UCC38C45DGK

7.0V / 6.6V UCC38C41D UCC38C41P UCC38C41DGK

SOIC--8

SMALL OUTLINE

(D){

PDIP--8

PLASTIC DIP

(P)

MSOP--8

SMALL OUTLINE

(DGK){

2

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UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45 UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45

SLUS458E -- AUGUST 2001 -- REVISED OCTOBER 2010

electrical characteristics VDD= 15 V (See Note 1), RT=10kΩ,CT=3.3nF,C

=0.1μF and no load

VDD

on the outputs, TA=--40°C to 105°C for the UCC28C4x and TA=0°Cto70°C for the UCC38C4x, TA=TJ(unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

Reference Section

Output voltage, initial accuracy TA=25°CI

Line regulation VDD=12Vto18V 0.2 20 mV

Load regulation 1mA to 20mA 3 25 mV

Temperature stability SeeNote2 0.2 0.4 mV/°C

Total output variation SeeNote2 4.82 5.18 V

Output noise voltage 10 Hz to 10 kHz, TA=25°C, SeeNote2 50 μV

Long term stability 1000 hours, TA= 125°C, SeeNote2 5 25 mV

Output short circuit –30 –45 –55 mA

Oscillator Section

Initial accuracy TA=25°C, SeeNote3 50.5 53 55 kHz

Voltage stability VDD=12Vto18V 0.2% 1.0%

Temperature stability T

Amplitude RT/CT Pin peak-to-peak 1.9 V

Discharge current

Error Amplifier Section

Feedback input voltage, initial accuracy V

Feedback input voltage, total variation V

Input bias current VFB=5.0V –0.1 –2.0 μA

Open-loop voltage gain (A

Unity gain bandwidth SeeNote2 1.0 1.5 MHz

Power s upply rejection ratio (PSRR) VDD=12Vto18V 60 dB

Output sink current VFB=2.7V, V

Output source current VFB=2.3V, V

High-level output voltage (VOH) VFB=2.7V, R

Low-level output voltage (VOL) VFB=2.7V, R

Current Sense Section

Gain SeeNote5,6 2.85 3.00 3.15 V/V

Maximum input signal VFB<2.4V 0.9 1.0 1.1 V

Power s upply rejection ratio (PSRR) VDD = 12 V to 18 V, See Note 2, 5 70 dB

Input bias current –0.1 –2.0 μA

CS to output delay 35 70 ns

COMP to CS offset VCS=0V 1.15 V

NOTE: 1. Adjust VDDabove the start threshold before setting at 15 V. NOTE: 2. Ensured by design. Not production tested.

NOTE: 3. Output frequencies of the UCC38C41, UCC38C44 and the UCC38C45 are half the oscillator frequency. NOTE: 4. Oscillator discharge current is measured with R NOTE: 5. Parameter measured at trip point of latch with VFB=0V.

NOTE: 6. Gain is defined as ACS =

) V

VOL

ΔV

to T

MIN

TA=25°C, RT/CT = 2 V, See Note 4 7.7 8.4 9.0 mA

RT/CT = 2 V, See Note 4 7.2 8.4 9.5 mA

COMP

OUT

COM

,0V ≼ VCS≼ 900mV

CS

,SeeNote2 1% 2.5%

MAX

=2.5V, TA=25°C 2.475 2.500 2.525 V

=2.5V, 2.45 2.50 2.55 V

=2Vto4V 65 90 dB

=10kΩ to V

T

=1mA 4.9 5.0 5.1 V

OUT

=1.1V 2 14 mA

COMP

=5V –0.5 –1.0 mA

COMP

=15ktoGND 5 6.8 V

LOAD

= 15 k to VREF 0.1 1.1 V

LOAD

REF.

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3

UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45

Startthreshol

d

V

Minimumoperatingvoltage

UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45

SLUS458E -- AUGUST 2001 -- REVISED OCTOBER 2010

electrical characteristics VDD= 15 V (See Note 1), RT=10kΩ,CT=3.3nF,C

=0.1μF and no load

VDD

on the outputs, TA=--40°C to 105°C for the UCC28C4x and TA=0°Cto70°C for the UCC38C4x, TA=TJ(unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

Output Section

V

low (R

OUT

V

high (R

OUT

Rise tIme TA=25°C, C

Fall time TA=25°C, C

Undervoltage Lockout Section

Start threshold

Minimum operating voltage

PWM Section

Maximum duty cycle

Minimum duty cycle VFB>2.6V 0%

Current Supply Section

Start-up current (I

Operating supply current (IDD) VFB=VCS=0V 2.3 3.0 mA

NOTE 1: Adjust VDDabove the start threshold before setting at 15 V.

pull-down) I

DS(on)

pull-up) I

DS(on)

START-UP

) VDD= Undervoltage lockout start threshold ( --0.5 V) 50 100 μA

= 200 mA 5.5 15

SINK

= 200 mA 10 25

SOURCE

=1nF 25 50

LOAD

=1nF 20 40

LOAD

UCC38C42, UCC38C44 13.5 14.5 15.5

UCC38C43, UCC38C45 7.8 8.4 9.0

UCC38C40, UCC38C41 6.5 7.0 7.5

UCC38C42, UCC38C44 8 9 10

UCC38C43, UCC38C45 7.0 7.6 8.2

UCC38C40, UCC38C41 6.1 6.6 7.1

UCC38C42, UCC38C43, UCC38C40, VFB<2.4V 94% 96%

UCC38C44, UCC38C45, UCC38C41, VFB<2.4V 47% 48%

Ω

ns

PDIP (P) or SOIC (D) PACKAGE

COMP

RT/CT

FB

CS

(TOP VIEW)

1

2

3

4

8

7

6

5

VREF VDD OUT GND

COMP

FB

CS

RT/CT

MSOP (DGK) PACKAGE

(TOP VIEW)

1

2

3

4

8

7

6

5

VREF VDD OUT GND

4

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UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45 UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45

SLUS458E -- AUGUST 2001 -- REVISED OCTOBER 2010

pin assignments

COMP: This pin provides the output of the error amplifier for compensation. In addition, the COMP pin is

frequently used as a control port by utilizing a secondary-side error amplifier to send an error signal across the secondary-primary isolation boundary through an opto-isolator.

CS: The current sense pin is the non-inverting input to the PWM comparator. This is compared to a signal proportional to the error amplifier output voltage. A voltage ramp can be applied to this pin to run the device with a voltage mode control configuration.

FB: This pin is the inverting input to the error amplifier. The non-inverting input to the error amplifier is internally trimmedto2.5V±1%.

GND: Ground return pin for the output driver stage and the logic level controller section.

OUT: The output of the on-chip drive stage. OUT is intended to directly drive a MOSFET. The OUT pin in the

UCC38C40, UCC38C42 and UCC38C43 is the same frequency as the oscillator, and can operate near 100% duty cycle. In the UCC38C41, UCC38C44 and the UCC38C45, the frequency of OUT is one-half that of the oscillator due to an internal T flipflop. This limits the maximum duty cycle to < 50%.

RT/CT: Timing resistor and timing capacitor. The timing capacitor should be connected to the device ground using minimal trace length.

VDD: Power s upply pin for the device. This pin should be bypassed with a 0.1-μF capacitor with minimal trace lengths. Additional capacitance may be needed to provid e hold up power to the device during startup.

VREF: 5-V reference. For stability, the reference should be bypassed with a 0.1-μF capacitor to ground using the minimal trace length possible.

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5

UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45 UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45

SLUS458E -- AUGUST 2001 -- REVISED OCTOBER 2010

APPLICATION INFORMATION

This device is a pin-for-pin replacement of the bipolar UC3842 family of controllers, the industry standard PWM controller for single-ended converters. Familiarity with this controller family is assumed.

The UCC28C4x/UCC38C4x series is an enhanced replacement with pin-to-pin compatibility to the bipolar UC284x/UC384x and UC284xA/UC384xA families. The new series offers improved performance when compared to older bipolar devices and other competitive BiCMOS devices with similar functionality. Note that these improvements discussed below generally consist of tighter specification limits that are a subset of the older product ratings, maintaining drop-in capability. In new designs these improvements can be utilized to reduce the component count or enhance circuit performance when compared to the previously available devices.

advantages

This device increases the total circuit efficiency whether operating off-line or in dc input circuits. In off-line applications the low start-up current of this device reduces steady state power dissipation in the startup resistor, and the low operating current maximizes efficiency while running. The low running current also provides an efficiency boost in battery operated supplies.

low voltage operation

Two members of the UCC38C4x family are intended for applications that require a lower start-up voltage than the original family members. The UCC38C40 and UCC38C41 have a turn-on voltage of 7.0 V typical and exhibit hysteresis of 0.4 V for a turn-off voltage of 6.6 V. This reduced start-up voltage enables use in systems with lower voltages, such as 12-V battery systems which are nearly discharged.

high speed operation

The BiCMOS design allows operation at high frequencies that were not feasible in the predecessor bipolar devices. First, the output stage has been redesigned to drive the external power switch in approximately half the time of the earlier devices. Second, the internal oscillator is more robust with less variation as frequency increases. In addition, the current sense to output delay has been reduced by a factor of three, to 45ns typical. These features combine to provide a device capable of reliable high frequency operation.

The UCC38C4x family oscillator is true to the curves of the original bipolar devices at lower frequencies yet extends the frequency programmability range to at least 1MHz. This allows the device to offer pin to pin capability where required yet capable of extending the operational range to the higher frequencies typical of latest applications. When the original UC3842 was released in 1984 most switching supplies operated between 20kHz and 100kHz. Today, the UCC38C4x can be used in designs cover a span roughly ten times higher than those numbers.

start/run current improvements

The start--up current is only 60 μA typical, a significant reduction from the bipolar device’s ratings of 300uA (UC384xA). For operation over the temperature range of --40 to 85°C the UCC28C4x devices offer a maximum startup current of 100 μA, an improvement over competitive BiCMOS devices. This allows the power supply designer to further optimize the selection of the startup resistor value to provide a more efficient design. In applications where low component cost overrides maximum efficiency the low run current of 2.3 mA, typical, may allow the control device to run directly through the single resistor to (+) rail, rather than needing a bootstrap winding on the power transformer, along with a rectifier. The start/run resistor for this case must also pass enough current to allow driving the primary switching MOSFET, which may be a few milliamps in small devices.

6

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UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45 UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45

SLUS458E -- AUGUST 2001 -- REVISED OCTOBER 2010

APPLICATION INFORMATION

± 1% initial reference voltage

The BiCMOS internal reference of 2.5 V has an enhanced design and utilizes production trim to allow initial accuracy of ±1% at room temperature and ± 2% over the full temperature range. This can be used to eliminate an external reference in applications that do not require the extreme accuracy afforded by the additional device. This is very useful for nonisolated dc-to-dc applications where the control device is referenced to the same common as the output. It is also applicable in offline designs that regulate on the primary side of the isolation boundary by looking at a primary bias winding, or perhaps from a winding on the output inductor of a buck-derived circuit.

reduced discharge current variation

The original UC3842 oscillator did not have trimmed discharged current, and the parameter was not specified on the datasheet. Since many customers attempted to use the discharge current to set a crude deadtime limit the UC3842A family was released with a trimmed discharge current specified at 25°C. The UCC28C4x/UCC38C4x series now offers even tighter control of this parameter, with approximately ±3% accuracy at 25°C, and less than 10% variation over temperature using the UCC28C4x devices. This level of accuracy can enable a meaningful limit to be programmed, a feature not currently seen in competitive BiCMOS devices. The improved oscillator and reference also contribute to decreased variation in the peak to peak variation in the oscillator waveform, which is often used as the basis for slope compensation for the complete power system.

soft-start

The following diagram provides a typical soft-start circuit for use with the UCC38C42. The values of R and C should be selected to bring the COMP pin up at a controlled rate, limiting the peak current supplied by the power stage. After the soft-start interval is complete the capacitor continues to charge to V

, effectively removing

REF

the PNP transistor from circuit considerations.

The optional diode in parallel with the resistor forces a soft-start each time the PWM goes through UVLO and the reference (V

) goes low. Without the diode,the capacitor otherwise remains charged during a brief loss

REF

of supply or brown-out, and no soft-start is enabled upon reapplication of VIN.

8

V

REF

UCC38C42

GND

5

1COMP

Figure 1

UDG--01072

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7

UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45 UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45

SLUS458E -- AUGUST 2001 -- REVISED OCTOBER 2010

APPLICATION INFORMATION

oscillator synchronization

The UCC38C4x oscillator has the same synchronization characteristics as the original bipolar devices. Thus, the information in the Application Note U--100A, UC3842/3/4/5 Provides Low-Cost Current-Mode Control, (TI Literature No. SLUA143) still applies. The application note describes how a small resistor from the timing capacitor-to-ground can offer an insertion point for synchronization to an external clock, (see Figures 2 and 3). Figure 2 shows how the UCC38C42 can be synchronized to an external clock source. This allows precise control of frequency and dead time with a digital pulse train.

8

V

REF

R

C

24

T

4

RT/C

T

UCC38C42 PWM

Ω

SYNCHRONIZATION CIRCUIT INPUT

CLOCK

INPUT

PWM

OUT

Figure 2. Oscillator Synchronization Circuit

LOW LOWHIGH

ON .

VCT(ANALOG)

V

SYNC

(DIGITAL)

COMBINED

ON .OFF .

Figure 3. Synchronization to an External Clock

OUTPUT A

UPPER THRESHOLD

V

CT

LOWER THRESHOLD

UDG--01069

UPPER THRESHOLD

LOWER THRESHOLD

UDG--01070

8

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UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45 UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45

SLUS458E -- AUGUST 2001 -- REVISED OCTOBER 2010

APPLICATION INFORMATION

precautions

The absolute maximum supply voltage is 20 V, including any transients that may be present. If this voltage is exceeded, device damage is likely. This is in contrast to the predecessor bipolar devices, w hich could s urvive up to 30 V.Thus, the supply pin should be decoupled as close to the ground pin as possible. Also, since no clamp is included in the device, the supply pin should be protected from external sources which could exceed the 20 V level.

Careful layout of the printed board has always been a necessity for high frequency power supplies. As the device switching speeds and operating frequencies increase the layout of the converter becomes increasingly important.

This 8-pin device has only a single ground for the logic and power connections. This forces the gate drive current pulses to flow through the s ame ground that the control circuit uses for reference. Thus, the interconnect inductance should be minimized as much as possible. One implication is to place the device (gate driver) circuitry close to the MOSFET it is driving. Note that this can conflict with the need for the error amplifier and the feedback path to be away from the noise generating components.

circuit applications

Figure 4 shows a typical off-line application.

D50

T1

R16

C13

D51

IC3

C52

IC2

R50

K

AR

C53

L50

C54

R50

C50

C51

R55

R52

R56

R53

R54

AC INPUT

100 Vac -- 240 Vac

EMI FILTER REQUIRED

IC2

F1

R10

C3

D2

D6

Q1

RT1

+

R6

1COMP

2FB

3CS

4RT/CT

BR1

UCC38C44

C12

R11

C18C1A

8REF

7VCC

6OUT

5GND

R12

C5

C55

12 V OUT

5V OUT

SEC COMMON

UDG--01071

Figure 4. Typical Off-Line Application

Figure 5 shows the forward converter with synchronous rectification. This application provides 48 V to 3.3 V at 10 A with over 85% efficiency and uses the UCC38C42 as the secondary-side controller and UCC3961 as the primary-side startup control device.

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9

UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45 UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45

SLUS458E -- AUGUST 2001 -- REVISED OCTOBER 2010

APPLICATION INFORMATION

+

C15

1uF

R22

100

0.22uF

7

5.6nF

20k

Vcc

D6

6

OUT

UCC38C4x

50k

R15

C14

1uF

5

GND

C24

0.1uF

3r3V

+

L1

C18

4.7uH 4700pF

T1

C21

C17

+

Q4

R20

0.1uF

C20

C19

R21

4700pF

10

470uF

10

PWRGND

C13

C26

2uF

8

6

7

5

BOOT

BTLO

HIDR

0.33

2

PGND

LODR

DT

Vcc

3

4

R23

402

C22

4.7nF

U4

TPS2832

IN

BAR74

1

R28

100

D3

BAR74

R9

R27

4.7

R26

4.7

Q3

20

R19

D5

Q1

21.5k

R16

8

U2

1

C23 680pF

REF

COMP2FB3CS4Rt/Ct

C16

R17

BZX84C15LT1

C12

3300pF

20k

R24

R14

R18

7.5k

C11

1500pF

R25

20k

20k 40%

D2

C2

1nF

R7

10k

VinP

D1

C25

0.047uF

R1

32.4k

+

R5

76.8k

R4

1.5k

R2

1.2k

C1

470uF

R8

5.1k

R6

4.7

Q2

13St14

R3

2.4k

VinN

UVS

U1

ucc3961

OVS2SD3SS

1

C3 10nF

R10

12

Vdd

C4

1k

C9

0.1uF

C8

1uF

11

Out

PGnd

4FB5Rt6

R11

0.22uF

8Vs9CS10

Ref7AGnd

C5

46.4k

C6

0.1uF

470pF

C7

100pF

C10

2.7nF

300

R13

3

4

T2

1

2

200

R12

Figure 5. Forward Converter with Synchronous Rectification Using the UCC38C42

as the Secondary-Side Controller

10

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UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45

k

Y

UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45

SLUS458E -- AUGUST 2001 -- REVISED OCTOBER 2010

TYPICAL CHARACTERISTICS

f -- Frequency -- Hz

OSCILLATOR FREQUENC

vs

TIMING RESISTANCE AND CAPACITANCE

10 M

CT = 220 pF

1M

100 k

10 k

CT = 4.7 nF

1k

1 k 10 k 100

-- Timing Resistance -- Ω

R

T

CT = 470 pF

CT = 2.2 nF

Figure 6

CT = 1 nF

OSCILLATOR DISCHARGE CURRENT

vs

TEMPERATURE

9.5

9.0

8.5

8.0

-- Oscillator Discharge Current -- mA

7.5

DISCH

I

7.0

--50 --25 0 25 50 75 100 125

TJ-- Temperature -- °C

Figure 7

100

90

80

70

60

50

40

Gain -- (dB)

30

20

10

0

1 10 100 10 k 100 k 1 M 10 M1k

PHASE

MARGIN

ERROR AMPLIFIER

FREQUENCY RESPONSE

GAIN

f -- Frequency -- Hz

Figure 8

200

180

160

140

120

100

80

60

40

20

0

COMP to CS OFFSET VOLTAGE (with CS = 0)

vs

TEMPERATURE

1.8

1.6

1.4

1.2

1.0

0.8

Phase Margin -- (°)

COMP to CS

0.6

0.4

0.2

0.0

--50 --25 0 25 50 75 100 125

TJ-- Temperature -- °C

Figure 9

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11

UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45 UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45

SLUS458E -- AUGUST 2001 -- REVISED OCTOBER 2010

TYPICAL CHARACTERISTICS

REFERENCE VOLTAGE

vs

TEMPERATURE

5.05

5.04

5.03

5.02

5.01

5.00

4.99

-- Reference Voltage -- V

4.98

REF

V

4.97

4.96

4.95

--50 --25 0 25 50 75 100 125

T

-- Temperature -- °C

J

Figure 10

ERROR AMPLIFIER REFERENCE VOLTAGE

vs

TEMPERATURE

2.55

2.54

2.53

2.52

2.51

2.50

2.49

2.48

-- Error Amplifier Reference Voltage -- V

2.47

2.46

EAREF

V

2.45

--50 --25 0 25 50 75 100 125

TJ-- Temperature -- °C

Figure 11

REFERENCE SHORT-CIRCUIT CURRENT

vs

TEMPERATURE

-- 3 5

-- 3 7

-- 3 9

-- 4 1

-- 4 3

-- 4 5

-- 4 7

-- 4 9

-- Reference Short Circuit Current -- mA

-- 5 1

SC

I

-- 5 3

-- 5 5

--50 --25 0 25 50 75 100 125 T

-- Temperature -- °C

J

Figure 12

ERROR AMPLIFIER INPUT BIAS CURRENT

vs

TEMPERATURE

200

150

100

50

0

-- 5 0

--100

-- Error Amplifier Input Bias Current -- nA

--150

BIAS

I

--200

--50 --25 0 25 50 75 100 125 TJ-- Temperature -- °C

Figure 13

12

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UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45 UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45

SLUS458E -- AUGUST 2001 -- REVISED OCTOBER 2010

TYPICAL CHARACTERISTICS

UNDERVOLTAGE LOCKOUT

vs

TEMPERATURE (UCC38C42 & UCC38C44)

16

15

14

13

12

11

-- U V L O V o l t a g e -- V 10

UVLO

9

V

8

7

6

--50 --25 0 25 50 75 100 125

UVLO

ON

UVLO

OFF

TJ-- Temperature -- °C

Figure 14

UNDERVOLTAGE LOCKOUT

vs

TEMPERATURE (UCC38C43 & UCC38C45)

9.0

8.8

8.6

8.4

8.2

8.0

-- U V L O V o l t a g e -- V

7.8

UVLO

V

7.6

7.4

7.2

7.0

--50 --25 0 25 50 75 100 125

UVLO

ON

UVLO

OFF

TJ-- Temperature -- °C

Figure 15

UNDERVOLTAGE LOCKOUT

vs

TEMPERATURE (UCC38C40 & UCC38C41)

7.3

7.2

7.1

7.0

6.9

6.8

-- U V L O V o l t a g e -- V

6.7

UVLO

6.6

V

6.5

6.4

6.3

--50 --25 0 25 50 75 100 125

UVLO

ON

UVLO

OFF

TJ-- Temperature -- °C

Figure 16

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13

UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45 UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45

SLUS458E -- AUGUST 2001 -- REVISED OCTOBER 2010

TYPICAL CHARACTERISTICS

SUPPLY CURRENT

vs

OSCILLATOR FREQUENCY

25

20

15

10

-- Supply Current -- mA

DD

I

5

0

0k 1M

200 k 400 k 600 k 800 k

f -- Frequency -- Hz

1-nF LOAD

Figure 17

NO LOAD

-- Supply Current -- mA

DD

I

3.0

2.9

2.8

2.7

2.6

2.5

2.4

2.3

2.2

2.1

2.0

SUPPLY CURRENT

vs

TEMPERATURE

NO LOAD

-- 5 0

--25 0 25 50 75 100 125

TJ-- Temperature -- °C

Figure 18

OUTPUT RISE TIME AND FALL TIME

vs

40

10% to 90%

V

35

30

25

20

Output Rise and Fall TIme -- ns

15

10

DD

--50 --25 0 25 50 75 100 125

TEMPERATURE

=12V

-- Temperature -- °C

T

J

tr

(1 nF)

Figure 19

MAXIMUM DUTY CYCLE

vs

OSCILLATOR FREQUENCY

100

CT = 220 pF

90

tf

80

70

Duty Cycle -- %

60

50

0

500

CT = 1 nF

1000

f -- Frequency -- kHz

1500

2000

2500

Figure 20

14

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UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45

A

Y

UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45

SLUS458E -- AUGUST 2001 -- REVISED OCTOBER 2010

TYPICAL CHARACTERISTICS

MAXIMUM DUTYCYCLE

vs

100

UCC38C40 UCC38C42 UCC38C43

98

96

94

Maximum Duty Cycle -- %

92

90

--50 --25 0 25 50 75 100 125

TEMPERATURE

T

-- Temperature -- °C

J

Figure 21

MAXIMUM DUTY CYCLE

vs

TEMPERATURE

50

UCC38C41 UCC38C44 UCC38C45

49

48

47

Output Rise and Fall TIme -- ns

46

45

--50 --25 0 25 50 75 100 125

-- Temperature -- °C

T

J

Figure 22

CURRENT SENSE THRESHOLD VOLTAGE

vs

1.10

1.05

1.00

-- Current Sense Threshold -- V

0.95

CS_th

V

0.90

--50 --25 0 25 50 75 100 125

TEMPERATURE

-- Temperature -- °C

T

J

Figure 23

CS TO OUT DEL

TIME

vs

TEMPERATURE

70

65

60

55

50

45

40

-- CD to OUT Delay Time -- ns

D

t

35

30

--50 --25 0 25 50 75 100 125

T

-- Temperature -- °C

J

Figure 24

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15

UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45 UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45

SLUS458E -- AUGUST 2001 -- REVISED OCTOBER 2010

Revision History

Revision SLUS458D to SLUS458E, 10/2010

1) Updated Operating Juction Temperature in the Recommended Operating Conditions Table, from

--55 to 150 to --40 to 105.

2) Updated Available Options Table heading from TAto TA=TJ.

16

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PACKAGE OPTION ADDENDUM

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PACKAGING INFORMATION

Orderable Device

UCC28C40D ACTIVE SOIC D 8 75 Green (RoHS

UCC28C40DG4 ACTIVE SOIC D 8 75 Green (RoHS

UCC28C40DGK ACTIVE MSOP DGK 8 80 Green (RoHS

UCC28C40DGKG4 ACTIVE MSOP DGK 8 80 Green (RoHS

UCC28C40DGKR ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC28C40DGKRG4 ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC28C40DR ACTIVE SOIC D 8 2500 Green (RoHS

UCC28C40DRG4 ACTIVE SOIC D 8 2500 Green (RoHS

UCC28C40P ACTIVE PDIP P 8 50 Green (RoHS

UCC28C40PG4 ACTIVE PDIP P 8 50 Green (RoHS

UCC28C41D ACTIVE SOIC D 8 75 Green (RoHS

UCC28C41DG4 ACTIVE SOIC D 8 75 Green (RoHS

UCC28C41DGK ACTIVE MSOP DGK 8 100 Green (RoHS

UCC28C41DGKG4 ACTIVE MSOP DGK 8 100 Green (RoHS

UCC28C41DGKR ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC28C41DGKRG4 ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC28C41DR ACTIVE SOIC D 8 2500 Green (RoHS

Status

(1)

Package Type Package

Drawing

Pins Package Qty

Eco Plan

& no Sb/Br)

(2)

Lead/

Ball Finish

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAUAGLevel-2-260C-1 YEAR

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAU N / A for Pkg Type

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAUAGLevel-2-260C-1 YEAR

CU NIPDAU Level-2-260C-1 YEAR

CU NIPDAU Level-1-260C-UNLIM

MSL Peak Temp

30-Jul-2011

(3)

Samples

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Addendum-Page 1

PACKAGE OPTION ADDENDUM

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Orderable Device

Status

(1)

Package Type Package

Drawing

Pins Package Qty

UCC28C41DRG4 ACTIVE SOIC D 8 2500 Green (RoHS

UCC28C42D ACTIVE SOIC D 8 75 Green (RoHS

UCC28C42DG4 ACTIVE SOIC D 8 75 Green (RoHS

UCC28C42DGK ACTIVE MSOP DGK 8 100 Green (RoHS

UCC28C42DGKG4 ACTIVE MSOP DGK 8 100 Green (RoHS

UCC28C42DGKR ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC28C42DGKRG4 ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC28C42DR ACTIVE SOIC D 8 2500 Green (RoHS

UCC28C42DRG4 ACTIVE SOIC D 8 2500 Green (RoHS

UCC28C42P ACTIVE PDIP P 8 50 Green (RoHS

UCC28C42PG4 ACTIVE PDIP P 8 50 Green (RoHS

UCC28C43D ACTIVE SOIC D 8 75 Green (RoHS

UCC28C43DG4 ACTIVE SOIC D 8 75 Green (RoHS

UCC28C43DGK ACTIVE MSOP DGK 8 80 Green (RoHS

UCC28C43DGKG4 ACTIVE MSOP DGK 8 80 Green (RoHS

UCC28C43DGKR ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC28C43DGKRG4 ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC28C43DR ACTIVE SOIC D 8 2500 Green (RoHS

Eco Plan

& no Sb/Br)

(2)

Lead/

Ball Finish

MSL Peak Temp

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAUAGLevel-2-260C-1 YEAR

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAU N / A for Pkg Type

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAU Level-2-260C-1 YEAR

CU NIPDAUAGLevel-2-260C-1 YEAR

CU NIPDAU Level-1-260C-UNLIM

30-Jul-2011

(3)

Samples

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Addendum-Page 2

PACKAGE OPTION ADDENDUM

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Orderable Device

Status

(1)

Package Type Package

Drawing

Pins Package Qty

UCC28C43DRG4 ACTIVE SOIC D 8 2500 Green (RoHS

UCC28C43P ACTIVE PDIP P 8 50 Green (RoHS

UCC28C43PG4 ACTIVE PDIP P 8 50 Green (RoHS

UCC28C44D ACTIVE SOIC D 8 75 Green (RoHS

UCC28C44DG4 ACTIVE SOIC D 8 75 Green (RoHS

UCC28C44DGK ACTIVE MSOP DGK 8 80 Green (RoHS

UCC28C44DGKG4 ACTIVE MSOP DGK 8 80 Green (RoHS

UCC28C44DGKR ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC28C44DGKRG4 ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC28C44DR ACTIVE SOIC D 8 2500 Green (RoHS

UCC28C44DRG4 ACTIVE SOIC D 8 2500 Green (RoHS

UCC28C44P ACTIVE PDIP P 8 50 Green (RoHS

UCC28C44PG4 ACTIVE PDIP P 8 50 Green (RoHS

UCC28C45D ACTIVE SOIC D 8 75 Green (RoHS

UCC28C45DG4 ACTIVE SOIC D 8 75 Green (RoHS

UCC28C45DGK ACTIVE MSOP DGK 8 100 Green (RoHS

UCC28C45DGKG4 ACTIVE MSOP DGK 8 100 Green (RoHS

UCC28C45DGKR ACTIVE MSOP DGK 8 2500 Green (RoHS

Eco Plan

& no Sb/Br)

(2)

Lead/

Ball Finish

MSL Peak Temp

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAU N / A for Pkg Type

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAUAGLevel-2-260C-1 YEAR

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAU N / A for Pkg Type

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAUAGLevel-2-260C-1 YEAR

30-Jul-2011

(3)

Samples

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Addendum-Page 3

PACKAGE OPTION ADDENDUM

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Orderable Device

Status

(1)

Package Type Package

Drawing

Pins Package Qty

UCC28C45DGKRG4 ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC28C45DR ACTIVE SOIC D 8 2500 Green (RoHS

UCC28C45DRG4 ACTIVE SOIC D 8 2500 Green (RoHS

UCC28C45P ACTIVE PDIP P 8 50 Green (RoHS

UCC28C45PG4 ACTIVE PDIP P 8 50 Green (RoHS

UCC38C40D ACTIVE SOIC D 8 75 Green (RoHS

UCC38C40DG4 ACTIVE SOIC D 8 75 Green (RoHS

UCC38C40DGK ACTIVE MSOP DGK 8 80 Green (RoHS

UCC38C40DGKG4 ACTIVE MSOP DGK 8 80 Green (RoHS

UCC38C40DGKR ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC38C40DGKRG4 ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC38C40DR ACTIVE SOIC D 8 2500 Green (RoHS

UCC38C40DRG4 ACTIVE SOIC D 8 2500 Green (RoHS

UCC38C40P ACTIVE PDIP P 8 50 Green (RoHS

UCC38C40PG4 ACTIVE PDIP P 8 50 Green (RoHS

UCC38C41D ACTIVE SOIC D 8 75 Green (RoHS

UCC38C41DG4 ACTIVE SOIC D 8 75 Green (RoHS

UCC38C41DGK ACTIVE MSOP DGK 8 100 Green (RoHS

Eco Plan

& no Sb/Br)

(2)

Lead/

Ball Finish

MSL Peak Temp

CU NIPDAUAGLevel-2-260C-1 YEAR

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAU N / A for Pkg Type

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAUAGLevel-2-260C-1 YEAR

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAU N / A for Pkg Type

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAUAGLevel-2-260C-1 YEAR

30-Jul-2011

(3)

Samples

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Addendum-Page 4

PACKAGE OPTION ADDENDUM

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Orderable Device

Status

(1)

Package Type Package

Drawing

Pins Package Qty

UCC38C41DGKG4 ACTIVE MSOP DGK 8 100 Green (RoHS

UCC38C41DR ACTIVE SOIC D 8 2500 Green (RoHS

UCC38C41DRG4 ACTIVE SOIC D 8 2500 Green (RoHS

UCC38C41P ACTIVE PDIP P 8 50 Green (RoHS

UCC38C41PG4 ACTIVE PDIP P 8 50 Green (RoHS

UCC38C42D ACTIVE SOIC D 8 75 Green (RoHS

UCC38C42DG4 ACTIVE SOIC D 8 75 Green (RoHS

UCC38C42DGK ACTIVE MSOP DGK 8 100 Green (RoHS

UCC38C42DGKG4 ACTIVE MSOP DGK 8 100 Green (RoHS

UCC38C42DGKR ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC38C42DGKRG4 ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC38C42DR ACTIVE SOIC D 8 2500 Green (RoHS

UCC38C42DRG4 ACTIVE SOIC D 8 2500 Green (RoHS

UCC38C42P ACTIVE PDIP P 8 50 Green (RoHS

UCC38C42PG4 ACTIVE PDIP P 8 50 Green (RoHS

UCC38C43D ACTIVE SOIC D 8 75 Green (RoHS

UCC38C43DG4 ACTIVE SOIC D 8 75 Green (RoHS

UCC38C43DGK ACTIVE MSOP DGK 8 80 Green (RoHS

Eco Plan

& no Sb/Br)

(2)

Lead/

Ball Finish

MSL Peak Temp

CU NIPDAUAGLevel-2-260C-1 YEAR

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAU N / A for Pkg Type

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAUAGLevel-2-260C-1 YEAR

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAU N / A for Pkg Type

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAUAGLevel-2-260C-1 YEAR

30-Jul-2011

(3)

Samples

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Addendum-Page 5

PACKAGE OPTION ADDENDUM

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Orderable Device

Status

(1)

Package Type Package

Drawing

Pins Package Qty

UCC38C43DGKG4 ACTIVE MSOP DGK 8 80 Green (RoHS

UCC38C43DGKR ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC38C43DGKRG4 ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC38C43DR ACTIVE SOIC D 8 2500 Green (RoHS

UCC38C43DRG4 ACTIVE SOIC D 8 2500 Green (RoHS

UCC38C43P ACTIVE PDIP P 8 50 Green (RoHS

UCC38C43PG4 ACTIVE PDIP P 8 50 Green (RoHS

UCC38C44D ACTIVE SOIC D 8 75 Green (RoHS

UCC38C44DG4 ACTIVE SOIC D 8 75 Green (RoHS

UCC38C44DGK ACTIVE MSOP DGK 8 80 Green (RoHS

UCC38C44DGKG4 ACTIVE MSOP DGK 8 80 Green (RoHS

UCC38C44DGKR ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC38C44DGKRG4 ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC38C44DR ACTIVE SOIC D 8 2500 Green (RoHS

UCC38C44DRG4 ACTIVE SOIC D 8 2500 Green (RoHS

UCC38C44P ACTIVE PDIP P 8 50 Green (RoHS

UCC38C44PG4 ACTIVE PDIP P 8 50 Green (RoHS

UCC38C45D ACTIVE SOIC D 8 75 Green (RoHS

Eco Plan

& no Sb/Br)

(2)

Lead/

Ball Finish

MSL Peak Temp

CU NIPDAUAGLevel-2-260C-1 YEAR

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAU N / A for Pkg Type

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAUAGLevel-2-260C-1 YEAR

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAU N / A for Pkg Type

CU NIPDAU Level-1-260C-UNLIM

30-Jul-2011

(3)

Samples

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Addendum-Page 6

PACKAGE OPTION ADDENDUM

www.ti.com

Orderable Device

UCC38C45DG4 ACTIVE SOIC D 8 75 Green (RoHS

UCC38C45DGK ACTIVE MSOP DGK 8 80 Green (RoHS

UCC38C45DGKG4 ACTIVE MSOP DGK 8 80 Green (RoHS

UCC38C45DGKR ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC38C45DGKRG4 ACTIVE MSOP DGK 8 2500 Green (RoHS

UCC38C45DR ACTIVE SOIC D 8 2500 Green (RoHS

UCC38C45DRG4 ACTIVE SOIC D 8 2500 Green (RoHS

UCC38C45P ACTIVE PDIP P 8 50 Green (RoHS

UCC38C45PG4 ACTIVE PDIP P 8 50 Green (RoHS

(1)

The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device.

Status

(1)

Package Type Package

Drawing

Pins Package Qty

Eco Plan

& no Sb/Br)

(2)

Lead/

Ball Finish

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAUAGLevel-2-260C-1 YEAR

CU NIPDAU Level-1-260C-UNLIM

CU NIPDAU N / A for Pkg Type

MSL Peak Temp

(3)

(Requires Login)

30-Jul-2011

Samples

(2)

Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability

information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that

lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

Addendum-Page 7

PACKAGE OPTION ADDENDUM

www.ti.com

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

30-Jul-2011

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

OTHER QUALIFIED VERSIONS OF UCC28C41, UCC28C43, UCC28C45 :

Automotive: UCC28C41-Q1

•

Enhanced Product: UCC28C43-EP, UCC28C45-EP

•

NOTE: Qualified Version Definitions:

Automotive - Q100 devices qualified for high-reliability automotive applications targeting zero defects

•

Enhanced Product - Supports Defense, Aerospace and Medical Applications

•

Addendum-Page 8

PACKAGE MATERIALS INFORMATION

www.ti.com 29-Jul-2011

TAPE AND REEL INFORMATION

*All dimensions are nominal

Device Package

UCC28C40DGKR MSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

UCC28C40DR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1

UCC28C41DGKR MSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

UCC28C41DR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1

UCC28C42DGKR MSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

UCC28C42DR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1

UCC28C43DGKR MSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

UCC28C43DR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1

UCC28C44DGKR MSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

UCC28C44DR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1

UCC28C45DGKR MSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

UCC28C45DR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1

UCC38C40DGKR MSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

UCC38C40DR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 UCC38C41DR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1

UCC38C42DGKR MSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

UCC38C42DR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1

UCC38C43DGKR MSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

Type

Package

Drawing

Pins SPQ Reel

Diameter

(mm)

Reel

Width

W1 (mm)

A0

(mm)B0(mm)K0(mm)P1(mm)W(mm)

Pin1

Quadrant

Pack Materials-Page 1

PACKAGE MATERIALS INFORMATION

www.ti.com 29-Jul-2011

Device Package

UCC38C43DR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1

UCC38C44DGKR MSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

UCC38C44DR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1

UCC38C45DGKR MSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

UCC38C45DR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1

Type

Package

Drawing

Pins SPQ Reel

Diameter

(mm)

Reel

Width

W1 (mm)

A0

(mm)B0(mm)K0(mm)P1(mm)W(mm)

Pin1

Quadrant

*All dimensions are nominal

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)

UCC28C40DGKR MSOP DGK 8 2500 366.0 364.0 50.0

UCC28C40DR SOIC D 8 2500 340.5 338.1 20.6

UCC28C41DGKR MSOP DGK 8 2500 346.0 346.0 29.0

UCC28C41DR SOIC D 8 2500 340.5 338.1 20.6

UCC28C42DGKR MSOP DGK 8 2500 346.0 346.0 29.0

UCC28C42DR SOIC D 8 2500 340.5 338.1 20.6

UCC28C43DGKR MSOP DGK 8 2500 346.0 346.0 29.0

UCC28C43DR SOIC D 8 2500 340.5 338.1 20.6

UCC28C44DGKR MSOP DGK 8 2500 366.0 364.0 50.0

UCC28C44DR SOIC D 8 2500 340.5 338.1 20.6

UCC28C45DGKR MSOP DGK 8 2500 366.0 364.0 50.0

UCC28C45DR SOIC D 8 2500 340.5 338.1 20.6

Pack Materials-Page 2

PACKAGE MATERIALS INFORMATION

www.ti.com 29-Jul-2011

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)

UCC38C40DGKR MSOP DGK 8 2500 346.0 346.0 29.0

UCC38C40DR SOIC D 8 2500 340.5 338.1 20.6 UCC38C41DR SOIC D 8 2500 340.5 338.1 20.6

UCC38C42DGKR MSOP DGK 8 2500 346.0 346.0 29.0

UCC38C42DR SOIC D 8 2500 340.5 338.1 20.6

UCC38C43DGKR MSOP DGK 8 2500 346.0 346.0 29.0

UCC38C43DR SOIC D 8 2500 340.5 338.1 20.6

UCC38C44DGKR MSOP DGK 8 2500 346.0 346.0 29.0

UCC38C44DR SOIC D 8 2500 340.5 338.1 20.6

UCC38C45DGKR MSOP DGK 8 2500 346.0 346.0 29.0

UCC38C45DR SOIC D 8 2500 340.5 338.1 20.6

Pack Materials-Page 3

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TEXAS INSTRUMENTS UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44 Technical data

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Frequently Asked Questions

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