Motorola MC34065P, MC34065DW, MC33065P, MC33065DW Datasheet

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Order this document by MC34065/D

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The MC34065 is a high performance, fixed frequency , dual current mode
controllers. It is specifically designed for off–line and dc–to–dc converter
applications offering the designer a cost effective solution with minimal
external components. This integrated circuit feature a unique oscillator for
precise duty cycle limit and frequency control, a temperature compensated
reference, two high gain error amplifiers, two current sensing comparators,
Drive Output 2 Enable pin, and two high current totem pole outputs ideally
suited for driving power MOSFETs.

Also included are protective features consisting of input and reference
undervoltage lockouts each with hysteresis, cycle–by–cycle current limiting,
and a latch for single pulse metering of each output.

The MC34065 and MC33065 are available in dual–in–line and surface
mount packages.

• Unique Oscillator for Precise Duty Cycle Limit and Frequency Control

• Current Mode Operation to 500 kHz

• Automatic Feed Forward Compensation

• Separate Latching PWMs for Cycle–By–Cycle Current Limiting

• Internally Trimmed Reference with Undervoltage Lockout

• Drive Output 2 Enable Pin

• Two High Current Totem Pole Outputs

• Input Undervoltage Lockout with Hysteresis

• Low Startup and Operating Current

HIGH PERFORMANCE

DUAL CHANNEL CURRENT

MODE CONTROLLER

SEMICONDUCTOR

TECHNICAL DATA

P SUFFIX

PLASTIC PACKAGE

CASE 648

DW SUFFIX

PLASTIC PACKAGE

CASE 751G

(SO–16L)

16

1

16

1

Representative Block Diagram

V

ref

Lockout

5.0 V

Reference

V

ref

Sync Input

R

T

C

T

Voltage

Feedback 1

Compensation 1

Drive Output 2

Enable

Voltage

Feedback 2

Compensation 2

15

1
3

2

4

5

14

13

12

R

R

Undervoltage

Oscillator

+
–

Error

Amp 1

+
–

Error

Amp 2

Gnd 8 Drive Gnd 9

This device contains 208 active transistors.

MOTOROLA ANALOG IC DEVICE DATA

V

CC

Undervoltage

Lockout

Latching

PWM 1

Latching

PWM 2

PIN CONNECTIONS

V

16

CC

Drive
Output 1

7

Current
Sense 1

6

Drive
Output 2

10

Current
Sense 2

11

 Motorola, Inc. 1996 Rev 1

Sync Input

Voltage Feedback 1

Compensation 1
Current Sense 1

Drive Output 1

ORDERING INFORMATION

Device

MC34065DW
MC34065P
MC33065DW
MC33065P

1
2

C

T

3

R

T

4
5
6
7
89

Gnd

(Top View)

Operating

Temperature Range

TA = 0° to +70°C

TA = –40° to +85°C

16

V

CC

15

V

ref

Drive Output 2

14

Enable

13

Voltage Feedback 2

12

Compensation 2

11

Current Sense 2

10

Drive Output 2
Drive Gnd

Package

SO–16L

Plastic DIP

SO–16L

Plastic DIP

1

MC34065 MC33065

MAXIMUM RATINGS

Rating Symbol Value Unit

Total Power Supply and Zener Current (ICC + IZ) 50 mA
Output Current, Source or Sink (Note 1) I

O

Output Energy (Capacitive Load per Cycle) W 5.0 µJ
Current Sense, Enable, and Voltage Feedback Inputs V

in

Sync Input

High State (Voltage) V
Low State (Reverse Current) I

Error Amp Output Sink Current I

IH

IL
O

Power Dissipation and Thermal Characteristics

DW Suffix, Plastic Package Case 751G

Maximum Power Dissipation @ TA = 25°C P
Thermal Resistance, Junction–to–Air R

D

θJA

P Suffix, Plastic Package Case 648

Maximum Power Dissipation @ TA = 25°C P
Thermal Resistance, Junction–to–Air R

Operating Junction Temperature T
Operating Ambient Temperature T

D

θJA

J

A

MC34065 0 to +70
MC33065 –40 to +85

Storage Temperature Range T

NOTE: ESD data available upon request.

stg

1.0 A

–0.3 to +5.5 V

5.5 V

–5.0 mA

10 mA

862 mW
145 °C/W

1.25 W
100 °C/W

+150 °C

–65 to +150 °C

°C

ELECTRICAL CHARACTERISTICS (V

= 15 V [Note 2], RT = 8.2 kΩ, CT = 3.3 nF, for typical values TA = 25°C, for

CC

min/max values TA is the operating ambient temperature range that applies [Note 3].)

Characteristics

Symbol Min Typ Max Unit

REFERENCE SECTION

Reference Output Voltage (IO = 1.0 mA, TJ = 25°C) V
Line Regulation (VCC = 11 V to 15 V) Reg
Load Regulation (IO = 1.0 mA to 10 mA) Reg
Total Output Variation over Line, Load, and Temperature V
Output Short Circuit Current I

ref

line

load

ref

SC

4.9 5.0 5.1 V
– 2.0 20 mV
– 3.0 25 mV

4.85 – 5.15 V
30 100 – mA

OSCILLATOR AND PWM SECTIONS

Total Frequency Variation over Line and Temperature f

VCC = 11 V to 15 V, TA = T

low

to T

high

osc

MC34065 46.5 49 51.5
MC33065 45 49 53

Frequency Change with Voltage (VCC = 11 V to 15 V) ∆f

/∆V – 0.2 1.0 %

osc

Duty Cycle at each Output %

Maximum DC
Minimum DC

max

min

46 49.5 52

– – 0

Sync Input Current µA

High State (Vin = 2.4 V) I
Low State (Vin = 0.8 V) I

NOTES: 1. Maximum package power dissipation limits must be observed.

2.Adjust VCC above the startup threshold before setting to 15 V.

3.Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible:
T

= 0°C for the MC34065 T

low

T

= –40°C for the MC33065 T

low

4.This parameter is measured at the latch trip point with VFB = 0 V

5.Comparator gain is defined as

AV

+

= +70°C for MC34065

high

= +85°C for MC33065

high

D

V Compensation

D

V Current Sense

IH

IL

– 170 250
– 80 160

kHz

2

MOTOROLA ANALOG IC DEVICE DATA

MC34065 MC33065

ELECTRICAL CHARACTERISTICS (continued) (V

= 15 V [Note 2], RT = 8.2 kΩ, CT = 3.3 nF, for typical values TA = 25°C, for

CC

min/max values TA is the operating ambient temperature range that applies [Note 3].)

Characteristics UnitMaxTypMinSymbol

ERROR AMPLIFIERS

Voltage Feedback Input (VO = 2.5 V) V
Input Bias Current (VFB = 5.0 V) I
Open Loop Voltage Gain (VO = 2.0 to 4.0 V) A

FB
IB

VOL

2.42 2.5 2.58 V
– – 0.1 –1.0 µA

65 100 – dB
Unity Gain Bandwidth (TJ = 25°C) BW 0.7 1.0 – MHz
Power Supply Rejection Ratio (VCC = 11 V to 15 V) PSRR 60 90 – dB
Output Current mA

Source (VO = 3.0 V, VFB = 2.3 V) I
Sink (VO = 1.2 V, VFB = 2.7 V) I

source

sink

–0.45 –1.0 –

2.0 12 –

Output Voltage Swing V

High State (RL = 15 k to ground, VFB = 2.3 V) V
Low State (RL = 15 k to V

, VFB = 2.7 V) V

ref

OH
OL

5.0 6.2 –
– 0.8 1.1

CURRENT SENSE SECTION

Current Sense Input Voltage Gain (Notes 4 and 5) A
Maximum Current Sense Input Threshold (Note 4) V
Input Bias Current I
Propagation Delay (Current Sense Input to Output) t

PLN(In/Out)

V
th

IB

2.75 3.0 3.25 V/V
430 480 530 mV

– –2.0 –10 µA
– 150 300 ns

DRIVE OUTPUT 2 ENABLE PIN

Enable Pin Voltage V

High State (Output 2 Enabled) V
Low State (Output 2 Disabled) V

Low State Input Current (VIL = 0 V) I

IH

IL

IB

3.5 – V

ref

0 – 1.5

100 250 400 µA

DRIVE OUTPUTS

Output Voltage V

Low State (I

High State(I

Output Voltage with UVLO Activated (VCC = 6.0 V, I
Output Voltage Rise T ime (CL = 1.0 nF) t
Output Voltage Fall T ime (CL = 1.0 nF) t

= 20 mA) V

sink

(I

= 200 mA) – 1.6 2.5

sink

= 20 mA) V

source

(I

= 200 mA) 12 13.4 –

source

= 1.0 mA) V

sink

OL

OH

OL(UVLO)

r
f

– 0.1 0.4

13 13.5 –

– 0.1 1.1 V
– 28 150 ns
– 25 150 ns

UNDERVOLTAGE LOCKOUT SECTION

Startup Threshold V
Minimum Operating Voltage After Turn–On V

CC(min)

th

13 14 15 V

9.0 10 11 V

TOTAL DEVICE

Power Supply Current I

CC

Startup (VCC = 12 V) – 0.6 1.0
Operating (Note 2) – 20 25

Power Supply Zener Voltage (ICC = 30 mA) V

NOTES: 1. Maximum package power dissipation limits must be observed.

2.Adjust VCC above the startup threshold before setting to 15 V.

3.Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible:
T

= 0°C for the MC34065 T

low

T

= –40°C for the MC33065 T

low

4.This parameter is measured at the latch trip point with VFB = 0 V

5.Comparator gain is defined as

AV

+

= +70°C for MC34065

high

= +85°C for MC33065

high

D

V Compensation

D

V Current Sense

Z

15.5 17 19 V

mA

MOTOROLA ANALOG IC DEVICE DATA

3

MC34065 MC33065

PIN FUNCTION DESCRIPTION

Pin Function Description

1 Sync Input A narrow rectangular waveform applied to this input will synchronize the oscillator. A dc voltage

2 C

3 R

T

T

4 Voltage Feedback 1 This pin is the inverting input of Error Amplifier 1. It is normally connected to the switching power

5 Compensation 1 This pin is the output of Error Amplifier 1 and is made available for loop compensation.
6 Current Sense 1 A voltage proportional to the inductor current is connected to this input. PWM 1 uses this

7 Drive Output 1 This pin directly drives the gate of a power MOSFET Q1. Peak currents up to 1.0 A are sourced

8 Gnd This pin is the control circuitry ground return and is connected back to the source ground.
9 Drive Gnd This pin is a separate power ground return that is connected back to the power source. It is used

10 Drive Output 2 This pin directly drives the gate of a power MOSFET Q2. Peak currents up to 1.0 A are sourced

11 Current Sense 2 A voltage proportional to inductor current is connected to this input. PWM 2 uses this information

12 Compensation 2 This pin is the output of Error Amplifier 2 and is made available for loop compensation.
13 Voltage Feedback 2 This pin is the inverting input of Error Amplifier 2. It is normally connected to the switching power

14 Drive Output 2 Enable A logic low at this input disables Drive Output 2.
15 V
16 V

ref
CC

within the range of 2.4 V to 5.5 V will inhibit the oscillator.
Timing capacitor CT connects from this pin to ground setting the free–running oscillator frequency

range.
Resistor RT connects from this pin to ground precisely setting the charge current for CT. RT must

be between 4.0 k and 16 k.

supply output through a resistor divider.

information to terminate conduction of output switch Q1.

and sunk by this pin.

to reduce the effects of switching transient noise on the control circuitry .

and sunk by this pin.

to terminate conduction of output switch Q2.

supply output through a resistor divider.

This is the 5.0 V reference output. It can provide bias for any additional system circuitry.
This pin is the positive supply of the control IC. The minimum operating voltage range after startup

is 11 V to 15.5 V.

Figure 1. Timing Resistor versus

Oscillator Frequency

16

3.3 nF

)

14

Ω

12

10

8.0

, TIMING RESISTOR (k

T

R

6.0

4.0
10 k 30 k 50 k 300 k 500 k100 k 1.0 M

5.0 nF

CT=
10 nF

VCC=15V

°

C

TA=25

f

osc, OSCILLATOR FREQUENCY (Hz)

500 pF

1.0 nF

2.2 nF

100 pF

220 pF

330 pF

4

Figure 2. Maximum Output Duty Cycle

50

48

46

44

VCC=15V

42

, DUTY CYCLE MAXIMUM (%)

RT= 4.0 k to 16 k
CL=15pF

max

40

TA = 25

DC

38

10 k 30 k 50 k 300 k 500 k100 k 1.0 M

versus Oscillator Frequency

°

f

osc, OSCILLATOR FREQUENCY (Hz)

Output 2

Output 1

MOTOROLA ANALOG IC DEVICE DATA

MC34065 MC33065

Figure 3. Error Amp Small–Signal

Transient Response

2.55 V

2.50 V

2.45 V

1.0 µs/DIV

Figure 5. Error Amp Open Loop Gain and

Phase versus Frequency

100

80

60

40

20

Gain

VCC=15V
AV= –1.0
TA=25

VCC=15V
VO= 1.5 V to 2.5 V
RL= 100 k

°

C

TA=25

Phase

°

C

0

30

60

90

120

3.0 V

2.5 V

20 mV/DIV

2.0 V

Figure 4. Error Amp Large–Signal

Transient Response

1.0 µs/DIV

Figure 6. Current Sense Input Threshold

versus Error Amp Output Voltage

0.6
VCC = 15 V

0.5

0.4

0.3

0.2

TA = 25°C

TA = 125°C

TA = –55°C

VCC=15V
AV= –1.0

°

C

TA=25

200 mV/DIV

, OPEN LOOP VOL TAGE GAIN (dB)

0

VOL

A

–20

10 100 1.0 k 10 k 100 k 1.0 M 10 M

f, FREQUENCY (Hz)

Figure 7. Reference V oltage Change

versus Source Current

0

VCC = 15 V

–4.0

–8.0

–12

–16

–20

, REFERENCE VOLTAGE CHANGE (mV)

ref

V

∆

–24

0

20 40 60 80 100 120

I

, REFERENCE SOURCE CURRENT (mA)

ref

TA = 25°C

TA = 125°C

TA = –55°C

, EXCESS PHASE (DEGREES)

150

φ

180

0.1

, CURRENT SENSE INPUT THRESHOLD (V)

0

th

V

0 1.0 2.0 3.0 4.0 7.05.0 6.0

120

100

80

60

, REFERENCE SHORT CIRCUIT CURRENT (mA)

–55

SC

I

VO, ERROR AMP OUTPUT VOLTAGE (V)

Figure 8. Reference Short Circuit Current

versus T emperature

VCC=15V

≤

0.1

R

L

–25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (°C)

Ω

MOTOROLA ANALOG IC DEVICE DATA

5