Texas Instruments PTH08T240F, PTH08T240FAZT Datasheet

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FEATURES

APPLICATIONS

DESCRIPTION

PTH08T240F

SLTS277 – DECEMBER 2006

10-A, 4.5-V to 14-V INPUT, NON-ISOLATED

POWER MODULE FOR 3-GHz DSP SYSTEMS

• Up to 10-A Output Current • TurboTrans™ Technology

• 4.5-V to 14-V Input Voltage • Designed to meet Ultra-Fast Transient

Requirements for 3-GHz DSP Systems

• Wide-Output Voltage Adjust (0.69 V to 2.0 V)

• 15 mV Output Voltage Deviation

• ± 1.5% Total Output Voltage Variation

= 3000 µ F, ∆ I = 5 A)

• Efficiencies up to 92%

• Output Overcurrent Protection

(Nonlatching, Auto-Reset)

• Wireless Infrastructure Base Stations

• Operating Temperature: –40 ° C to 85 ° C

• Safety Agency Approvals:

– UL/IEC/CSA-C22.2 60950-1

• Prebias Startup

• On/Off Inhibit

• Differential Output Voltage Remote Sense

• Adjustable Undervoltage Lockout

• Auto-Track™ Sequencing

• SmartSync Technology

The PTH08T240F is a high-performance 10-A rated, non-isolated power module designed to meet ultra-fast transient requirements for 3-GHz DSP systems. This module represent the 2nd generation of the popular PTH series power modules which include a reduced footprint and additional features.

Operating from an input voltage range of 4.5 V to 14 V, the PTH08T240F requires a single resistor to set the output voltage to any value over the range, 0.69 V to 2.0 V. The output voltage range makes the PTH08T240F particularly suitable for the 3-GHz DSP's core voltage requirements between 0.9 V and 1.1 V. Additionally, the wide input voltage range increases design flexibility by supporting operation with 5-V, 8-V, or 12-V intermediate bus architectures.

The module incorporates a comprehensive list of features. Output over-current and over-temperature shutdown protects against most load faults. A differential remote sense ensures tight load regulation. An adjustable under-voltage lockout allows the turn-on voltage threshold to be customized. Auto-Track™sequencing is a popular feature that greatly simplifies the simultaneous power-up and power-down of multiple modules in a power system.

The PTH08T240F includes new patent pending technologies, TurboTrans™ and SmartSync. The TurboTrans feature optimizes the transient response of the regulator while simultaneously reducing the quantity of external output capacitors required to meet a target voltage deviation specification. TurboTrans allows PTH08T240F to meet the tight transient voltage tolerances required by 3-GHz DSPs with minimal output capacitance. SmartSync allows for switching frequency synchronization of multiple modules, thus simplifying EMI noise suppression tasks and reducing input capacitor RMS current requirements. The module uses double-sided surface mount construction to provide a low profile and compact footprint. Package options include both through-hole and surface mount configurations that are lead (Pb) - free and RoHS compatible.

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

Auto-Track, TMS320 are trademarks of Texas Instruments.

PRODUCT PREVIEW information concerns products in the

formative or design phase of development. Characteristic data and other specifications are design goals. Texas Instruments reserves the right to change or discontinue these products without notice.

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PRODUCT PREVIEW

UDG−06005

0.05 W (Optional)

1000 µF (Required)

SET

[A]

0.05 W (Required)

330 µF (Required)

UVLO

0.05 W (Optional)

VOAdj

TurboTranst

PTH08T240F

Track

GND

+Sense

L O A D

−Sense

GND

Inhibit

INH/UVLO

Track

−Sense

+Sense

SYNC

SmartSync

CI2 22 µF (Optional)

PTH08T240F

SLTS277 – DECEMBER 2006

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.

A. R

SET

required to set the output voltage to a value higher than 0.69 V. See Electrical Characteristics table.

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DATASHEET TABLE OF CONTENTS

ENVIRONMENTAL AND ABSOLUTE MAXIMUM RATINGS

PTH08T240F

SLTS277 – DECEMBER 2006

ORDERING INFORMATION

For the most current package and ordering information, see the Package Option Addendum at the end of this datasheet, or see the TI website at www.ti.com.

DATASHEET SECTION PAGE NUMBER

ENVIRONMENTAL AND ABSOLUTE MAXIMUM RATINGS 3 ELECTRICAL CHARACTERISTICS TABLE 4 TERMINAL FUNCTIONS 6 TYPICAL CHARACTERISTICS (VI= 12V) 7 TYPICAL CHARACTERISTICS (VI= 5V) 8 ADJUSTING THE OUTPUT VOLTAGE 9 INPUT & OUTPUT CAPACITOR RECOMMENDATIONS 11 TURBOTRANS™ INFORMATION 15 UNDERVOLTAGE LOCKOUT (UVLO) 20 SOFT-START POWER-UP 21 OUTPUT INHIBIT 22 OVER-CURRENT PROTECTION 23 OVER-TEMPERATURE PROTECTION 23 REMOTE SENSE 23 SYCHRONIZATION (SMARTSYNC) 24 AUTO-TRACK SEQUENCING 25 PREBIAS START-UP 28 TAPE & REEL AND TRAY DRAWINGS 30

(Voltages are with respect to GND)

UNIT

Track

Track pin voltage –0.3 to VI+ 0.3 V

Operating temperature range Over VIrange –40 to 85

suffix AH 235

Surface temperature of module body or

wave

Wave soldering temperature

pins for 5 seconds maximum.

suffix AD 260

° C

suffix AS 235

(1)

Surface temperature of module body or

reflow

Solder reflow temperature

pins

suffix AZ 260

(1)

stg

Storage temperature –40 to 125

(2)

Mechanical shock Per Mil-STD-883D, Method 2002.3 1 suffix AH & AD 500

msec, 1/2 sine, mounted

suffix AS & AZ 250 G Mechanical vibration Mil-STD-883D, Method 2007.2 20-2000 Hz 15 Weight 5 grams Flammability Meets UL94V-O

(1) During reflow of surface mount package version do not elevate peak temperature of the module, pins or internal components above the

stated maximum.

(2) The shipping tray or tape and reel cannot be used to bake parts at temperatures higher than 65°C.

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ELECTRICAL CHARACTERISTICS

PTH08T240F

SLTS277 – DECEMBER 2006

PTH08T240F

TA= 25 ° C, VI= 5 V, VO= 1.0 V, CI= 330 µF, CO= 1000 µF, and IO= IOmax (unless otherwise stated)

PARAMETER TEST CONDITIONS PTH08T240F UNIT

MIN TYP MAX

Output current Over VOrange 25 ° C, natural convection 0 10 A

11 ×

0.69 ≤ VO≤ 1.2 4.5

(1)

Input voltage range Over IOrange V

1.2 < VO≤ 2.0 4.5 14

OADJ

Output voltage adjust range Over IOrange 0.69 2.0 V Set-point voltage tolerance ± 0.5 ± 1

(2)

Temperature variation –40 ° C < TA< 85 ° C ± 0.3 %V

Line regulaltion Over VIrange ± 3 mV Load regulation Over IOrange ± 2 mV Total output variation Includes set-point, line, load, –40 ° C ≤ TA≤ 85 ° C ± 1.5

(2)

SET

= 4.78 k Ω , VO= 1.8 V 90%

SET

= 7.09 k Ω , VO= 1.5 V 88%

η Efficiency IO= 10 A

SET

= 12.1 k Ω , VO= 1.2 V 87%

SET

= 20.8 k Ω , VO= 1.0 V 85%

VORipple (peak-to-peak) 20-MHz bandwidth 10

(3)

LIM

Overcurrent threshold Reset, followed by auto-recovery 20 A

Recovery time tbd µs

w/o TurboTrans CO= 1000 µ F, Type C

∆ V

2.5 A/µs load step VOover/undershoot tbd mV

Transient response 50 to 100% IOmax

trTT

w/ TurboTrans Recovery time tbd µs

VO= 2.5 V

CO= tbd µ F, Type C,

∆ V

trTT

VOover/undershoot tbd

RTT = tbd Ω

Track input current (pin 10) Pin to GND –130

(4)

µA

track

/dt Track slew rate capability CO≤ CO(max) 1 V/ms

VIincreasing, R

UVLO

= OPEN 4.3 4.45

Adjustable Under-voltage lockout

UVLO

ADJ

VIdecreasing, R

UVLO

= OPEN 4.0 4.2 V

(pin 11)

Hysteresis, R

UVLO

≤ 52.3 k Ω 0.5

Input high voltage (VIH) Open

(5)

Inhibit control (pin 11) Input low voltage (VIL) -0.2 0.8

Input low current (IIL), Pin 11 to GND -235 µA

Input standby current Inhibit (pin 11) to GND, Track (pin 10) open 5 mA

Switching frequency Over VIand IOranges, SmartSync (pin 1) to GND 260 300 340 kHz Synchronization (SYNC)

SYNC

240 400 kHz

frequency

SYNCH

SYNC High-Level Input Voltage 2 5.5 V

SYNCL

SYNC Low-Level Input Voltage 0.8 V

SYNC

SYNC Minimum Pulse Width 200 nSec

Nonceramic 330

(6)

External input capacitance µF

Ceramic 22

(6)

(1) The maximum input voltage is duty cycle limited to (VO× 11) or 14 volts, whichever is less. The maximum allowable input voltage is a

function of switching frequency, and may increase or decrease when the SmartSync feature is utilized. Please review the SmartSync section of the Application Information for further guidance.

(2) The set-point voltage tolerance is affected by the tolerance and stability of R

SET

. The stated limit is unconditionally met if R

SET

has a

tolerance of 1% with 100 ppm/°C or better temperature stability.

(3) For output voltages less than 1.7 V, the ripple may increase (up to 2 × ) when operating at input voltages greater than (VO× 11). See the

SmartSync section of the Application Information for input voltage and frequency limitations.

(4) A low-leakage (<100 nA), open-drain device, such as MOSFET or voltage supervisor IC, is recommended to control pin 10. The

open-circuit voltage is less than 8 Vdc.

(5) This control pin has an internal pull-up. Do not place an external pull-up on this pin. If it is left open-circuit, the module operates when

input power is applied. A small, low-leakage (<100 nA) MOSFET is recommended for control. For additional information, see the related application information section.

(6) A 330 µF electrolytic input capacitor is required for proper operation. The electrolytic capacitor must be rated for a minimum of 500 mA

rms of ripple current.

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PTH08T240F

SLTS277 – DECEMBER 2006

ELECTRICAL CHARACTERISTICS (continued)

PTH08T240F

TA= 25 ° C, VI= 5 V, VO= 1.0 V, CI= 330 µF, CO= 1000 µF, and IO= IOmax (unless otherwise stated)

PARAMETER TEST CONDITIONS PTH08T240F UNIT

MIN TYP MAX

Nonceramic 1000

(7)

5000

(8)

Capacitance Value µF

w/o TurboTrans Ceramic 500

Equivalent series resistance (non-ceramic) 7 m Ω

External output capacitance

see table

Capacitance Value µF

(7) (9)

w/ TurboTrans

Capacitance × ESR product (CO× ESR) 1000 10000

(9)

µF × m Ω

Per Telcordia SR-332, 50% stress,

MTBF Reliability 6.1

106Hr

TA= 40 ° C, ground benign

(7) 1000 µF of external output capacitance is required for basic operation. The minimum output capacitance requirement increases when

TurboTrans™ (TT) technology is utilized. See related Application Information for more guidance.

(8) This is the calculated maximum disregarding TurboTrans™ technology. When the TurboTrans™ feature is utilized, the minimum output

capacitance must be increased.

(9) When using TurboTrans™ technology, a minimum value of output capacitance is required for proper operation. Additionally, low ESR

capacitors are required for proper operation. See the application notes for further guidance.

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PRODUCT PREVIEW

1 10

543

PTH08T240F

(Top View)

PTH08T240F

SLTS277 – DECEMBER 2006

TERMINAL FUNCTIONS

TERMINAL

DESCRIPTION

NAME NO.

2 The positive input voltage power node to the module, which is referenced to common GND.

5 The regulated positive power output with respect to GND.

This is the common ground connection for the VIand VOpower connections. It is also the 0 Vdcreference for

GND 3, 4

the control inputs. The Inhibit pin is an open-collector/drain, negative logic input that is referenced to GND. Applying a low level

ground signal to this input disables the module’s output and turns off the output voltage. When the Inhibit control is active, the input current drawn by the regulator is significantly reduced. If the Inhibit pin is left open-circuit, the

Inhibit

(1)

and

module produces an output whenever a valid input source is applied.

UVLO

This pin is also used for input undervoltage lockout (UVLO) programming. Connecting a resistor from this pin to GND (pin 3) allows the ON threshold of the UVLO to be adjusted higher than the default value. For more information, see the Application Information section.

A 0.05 W 1% resistor must be directly connected between this pin and pin 7 (–Sense) to set the output voltage to a value higher than 0.69 V. The temperature stability of the resistor should be 100 ppm/ ° C (or better). The setpoint range for the output voltage is from 0.69 V to 2.0 V. If left open circuit, the output voltage will default to

VoAdjust 8

its lowest value. For further information, on output voltage adjustment see the related application note. The specification table gives the preferred resistor values for a number of standard output voltages. The sense input allows the regulation circuit to compensate for voltage drop between the module and the load.

+ Sense 6

For optimal voltage accuracy, +Sense must be connected to VO, very close to the load. The sense input allows the regulation circuit to compensate for voltage drop between the module and the load.

– Sense 7 For optimal voltage accuracy –Sense must be connected to GND (pin 4) very close to the module (within

10 cm). This is an analog control input that enables the output voltage to follow an external voltage. This pin becomes

active typically 20 ms after the input voltage has been applied, and allows direct control of the output voltage from 0 V up to the nominal set-point voltage. Within this range the module's output voltage follows the voltage at

Track 10

the Track pin on a volt-for-volt basis. When the control voltage is raised above this range, the module regulates at its set-point voltage. The feature allows the output voltage to rise simultaneously with other modules powered from the same input bus. If unused, this input should be connected to VI.

NOTE: Due to the undervoltage lockout feature, the output of the module cannot follow its own input voltage during power up. For more information, see the related application note.

This input pin adjusts the transient response of the regulator. To activate the TurboTrans™ feature, a 1%, 50 mW resistor must be connected between this pin and pin 6 (+Sense) very close to the module. For a given value of output capacitance, a reduction in peak output voltage deviation is achieved by utililizing this feature. If

TurboTrans™ 9

unused, this pin must be left open-circuit. The resistance requirement can be selected from the TurboTrans™ resistor table in the Application Information section. External capacitance must never be connected to this pin unless the TurboTrans resistor value is a short, 0 Ω .

This input pin sychronizes the switching frequency of the module to an external clock frequency. The SmartSync feature can be used to sychronize the switching fequency of multiple PTH08T240F modules, aiding EMI noise

SmartSync 1

suppression efforts. If unused, this pin should be connected to GND (pin 3). For more information, please review the Application Information section.

(1) Denotes negative logic: Open = Normal operation, Ground = Function active

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TYPICAL CHARACTERISTICS

(1) (2)

CHARACTERISTIC DATA (V

= 12 V)

2 4 6 8 10

100

IO − Output Current − A

= 12 V

= 1.8 V

= 1.2 V

η − Efficiency − %

(V)

1.8

1.2

0 2 4 6 8 10

0.5

1.0

2.5

2.0

3.0

4.0

3.5

1.5

IO − Output Current − A

= 12 V

= 1.8 V

= 1.2 V

− Power Dissipation − W

(V)

1.8

1.2

6 8 10

2 4

IO − Output Current − A

= 12 V

− Output Voltage Ripple − mV

= 1.2 V

= 1.8 V

(V)

1.8

1.2

IO − Output Current − A

− Ambient Temperature − °C

0 2 4 6 8 10

= 12 V

= 1.2 V

Natural Convection

PTH08T240F

SLTS277 – DECEMBER 2006

EFFICIENCY OUTPUT RIPPLE POWER DISSIPATION

vs vs vs

LOAD CURRENT LOAD CURRENT LOAD CURRENT

Figure 1. Figure 2. Figure 3.

SAFE OPERATING AREA

Figure 4.

(1) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the

converter. Applies to Figure 1 , Figure 2 , and Figure 3 .

(2) The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum

operating temperatures. Derating limits apply to modules soldered directly to a 100 mm x 100 mm double-sided PCB with 2 oz. copper. For surface mount packages (AS and AZ suffix), multiple vias must be utilized. Please refer to the mechanical specification for more information. Applies to Figure 4 .

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PRODUCT PREVIEW

TYPICAL CHARACTERISTICS

(1) (2)

CHARACTERISTIC DATA (V

= 5 V)

0 2 4 6 8 10

0.5

1.0

2.0

1.5

2.5

IO − Output Current − A

= 5 V

= 0.9 V

= 1.8 V

− Power Dissipation − W

= 1.2 V

= 0.7 V

0.7

0.9

1.8

1.2

(V)

IO − Output Current − A

− Output Voltage Ripple − mV

2 4 6 8 10

= 5 V

= 1.8 V

= 1.2 V

= 0.9 V

= 0.7 V

0.7

0.9

1.8

1.2

(V)

2 4 6 8 10

100

0.7

0.9

1.8

1.2

IO − Output Current − A

= 5 V

= 1.8 V

= 1.2 V

η − Efficiency − %

= 0.9 V

= 0.7 V

(V)

0 2 4 6 8 10

Natural

Convection

IO − Output Current − A

= 5 V

All V

− Ambient Temperature − °C

PTH08T240F

SLTS277 – DECEMBER 2006

EFFICIENCY OUTPUT RIPPLE POWER DISSIPATION

vs vs vs

LOAD CURRENT LOAD CURRENT LOAD CURRENT

Figure 5. Figure 6. Figure 7.

SAFE OPERATING AREA

Figure 8.

(1) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the

converter. Applies to Figure 5 , Figure 6 , and Figure 7 .

(2) The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum

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APPLICATION INFORMATION

ADJUSTING THE OUTPUT VOLTAGE

R =10k x

SET

0.69

V -0.69

-1.43kW

(1)

+Sense

−Sense

VoAdjGND

PTH08T240F

+Sense

−Sense

GND

SET

0.05 W

UDG−06077

PTH08T240F

SLTS277 – DECEMBER 2006

The VoAdjust control (pin 8) sets the output voltage of the PTH08T240F. The adjustment range is 0.69 V to 2.0 V. The adjustment method requires the addition of a single external resistor, R

SET

, that must be connected

directly between the V

Adjust and – Sense pins. Table 1 gives the standard value of the external resistor for a

number of standard voltages, along with the actual output voltage that this resistance value provides. For other output voltages, the value of the required resistor can either be calculated using the following formula,

or simply selected from the range of values given in Table 2 . Figure 9 shows the placement of the required resistor.

Table 1. Standard Values of R

SET

for Standard Output Voltages

VO(Standard) (V) R

SET

(Standard Value) (k Ω ) VO(Actual) (V)

1.8 4.75 1.807

1.5 6.98 1.510

1.2

(1)

12.1 1.200

(1)

20.5 1.004

0.7

(1)

681 0.700

(1) The maximum input voltage is (VO× 11) or 14 V, whichever is less. The maximum allowable input

voltage is a function of switching frequency and may increase or decrease when the Smart Sync feature is utilized. Please review the Smart Sync application section for further guidance.

(1) R

SET

: Use a 0.05 W resistor with a tolerance of 1% and temperature stability of 100 ppm/ ° C (or better). Connect the

resistor directly between pins 8 and 7, as close to the regulator as possible, using dedicated PCB traces.

(2) Never connect capacitors from VOAdjust to either + Sense, GND, or VO. Any capacitance added to the VOAdjust pin

affects the stability of the regulator.

Figure 9. V

Adjust Resistor Placement

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PTH08T240F

SLTS277 – DECEMBER 2006

Table 2. Output Voltage Set-Point Resistor Values

(Standard Values)

VORequired (V) R

SET

(k Ω )

0.70

(1)

681

0.75

(1)

113

0.80

(1)

61.9

0.85

(1)

41.2

0.90

(1)

31.6

0.95

(1)

24.9

1.00

(1)

20.5

1.05

(1)

17.8

1.10

(1)

15.4

1.15

(1)

13.3

1.20

(1)

12.1

1.25

(1)

10.7

1.30 9.88

1.35 9.09

1.40 8.25

1.45 7.68

1.50 6.98

1.55 6.49

1.60 6.04

1.65 5.76

1.70 5.36

1.75 5.11

1.80 4.75

1.85 4.53

1.90 4.22

1.95 4.02

2.00 3.83

(1) The maximum input voltage is (VO× 11) or 14 V, whichever is less.

The maximum allowable input voltage is a function of switching frequency and may increase or decrease when the Smart Sync feature is utilized. Please review the Smart Sync application section for further guidance.

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TurboTrans™ Technology

TurboTrans™ Selection

PTH08T240F

SLTS277 – DECEMBER 2006

TurboTrans technology is a feature introduced in the T2 generation of the PTH/PTV family of power modules. TurboTrans optimizes the transient response of the regulator with added external capacitance using a single external resistor. Benefits of this technology include reduced output capacitance, minimized output voltage deviation following a load transient, and enhanced stability when using ultra-low ESR output capacitors. The amount of output capacitance required to meet a target output voltage deviation will be reduced with TurboTrans activated. Likewise, for a given amount of output capacitance, with TurboTrans engaged, the amplitude of the voltage deviation following a load transient will be reduced. Applications requiring tight transient voltage tolerances and minimized capacitor footprint area will benefit greatly from this technology.

Utilizing TurboTrans requires connecting a resistor, R

, between the +Sense pin (pin 6) and the TurboTrans pin (pin 9). The value of the resistor directly corresponds to the amount of output capacitance required. All T2 products require a minimum value of output capacitance whether or not TurboTrans is utilized. For the PTH08T240F, the minimum required capacitance is 1000 µ F. When using TurboTrans, capacitors with a capacitance × ESR product below 10,000 µ F × m Ω are required. (Multiply the capacitance (in µ F) by the ESR (in m Ω ) to determine the capacitance × ESR product.) See the Capacitor Selection section of the datasheet for a variety of capacitors that meet this criteria.

Figure 10 shows the amount of output capacitance required to meet a desired transient voltage deviation with

and without TurboTrans for Type C (e.g. OS-CON) capacitors; Type B (e.g. polymer-tantalum) capacitor charts will be added. To calculate the proper value of R

, first determine your required transient voltage deviation limits and magnitude of your transient load step. Next, determine what type of output capacitors will be used. (If more than one type of output capacitor is used, select the capacitor type that makes up the majority of your total output capacitance.) Knowing this information, use the chart (Figure 10 ; for Type C capacitors) that corresponds to the capacitor type selected. To use the chart, begin by dividing the maximum voltage deviation limit (in mV) by the magnitude of your load step (in Amps). This gives a mV/A value. Find this value on the Y-axis of the appropriate chart. Read across the graph to the 'With TurboTrans' plot. From this point, read down to the X-axis which lists the minimum required capacitance, CO, to meet that transient voltage deviation. The required R

resistor value can then be calculated using the equation or selected from the TurboTrans table. The TurboTrans tables include both the required output capacitance and the corresponding R

values to meet several values of

transient voltage deviation for 25% (2.5 A), 50% (5 A), and 75% (7.5 A) output load steps. The chart can also be used to determine the achievable transient voltage deviation for a given amount of output

capacitance. By selecting the amount of output capacitance along the X-axis, reading up to the desired 'With TurboTrans'' curve, and then over to the Y-axis, gives the transient voltage deviation limit for that value of output capacitance. The required R

resistor value can be calculated using the equation or selected from the

TurboTrans table. As an example, let's look at a 5-V application requiring a 15 mV deviation during an 5 A, 50% load transient. A

majority of 680 µ F, 10 m Ω ouput capacitors will be used. Use the 5-V, Type C capacitor chart, Figure 10 . Dividing 15 mV by 5 A gives 3 mV/A transient voltage deviation per amp of transient load step. Select 3 mV/A on the Y-axis and read across to the 'With TurboTrans'' plot. Following this point down to the X-axis gives a minimum required output capacitance of approximately 3000 µ F. The required R

resistor value for 3000 µ F

can then be calculated or selected from Table 3 . The required R

resistor is approximately 13.0 k Ω .

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PRODUCT PREVIEW

PTH08T240F Type C Capacitors

6000

5000

4000

3000

2000

1000

7 6

5 4

10000

8000

9000

7000

9 8

C − Capacitance − µF

Transient −mV/A

Without TurboTrans

With TurboTrans

40 ƪ1 *ǒCOń6300

Ǔƫ

5 C

) 1300

ń6300Ǔ* 1

(kW)

(2)

PTH08T240F

SLTS277 – DECEMBER 2006

5-V Input

Figure 10. Capacitor Type C, 5000 < C( µ F) × ESR(m Ω ) ≤

10,000 (e.g. OS-CON)

Table 3. Type C TurboTrans C

Values and Required R

Selection Table

Transient Voltage Deviation (mV) 5-V Input

25% load step 50% load step 75% load step C

(2.5 A) (5 A) (7.5 A) Minimum Required Required TurboTrans

Output Resistor (k Ω )

Capacitance ( µ F)

23 45 68 1000 open 20 40 60 1150 274 18 35 53 1300 133 15 30 45 1500 76.8 13 25 38 1810 44.2 10 20 30 2300 24.9

8 15 23 3050 12.7 5 10 15 4620 3.74

Resistor Selection

The TurboTrans resistor value, R

can be determined from the TurboTrans programming, see Equation 2 .

Where C

is the total output capacitance in µ F. C

values greater than or equal to 6300 µ F require R

to be a

short, 0 Ω . (R

results in a negative value when C

> 6300 µ F).

To ensure stability, the value of R

must be calculated using the minimum required output capacitance

determined from the capacitor transient response charts above.

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Texas Instruments PTH08T240F, PTH08T240FAZT Datasheet

Specifications and Main Features

Frequently Asked Questions

User Manual