MOTOROLA MC34023, MC33023 Technical data

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The MC34023 series are high speed, fixed frequency , single–ended pulse
width modulator controllers optimized for high frequency operation. They are
specifically designed for Off–Line and DC–to–DC converter applications
offering the designer a cost–effective solution with minimal external
components. These integrated circuits feature an oscillator, a temperature
compensated reference, a wide bandwidth error amplifier, a high speed
current sensing comparator, and a high current totem pole output ideally
suited for driving a power MOSFET.

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.

The flexibility of this series allows it to be easily configured for either
current mode or voltage mode control.

• 50 ns Propagation Delay to Output

• High Current Totem Pole Output

• Wide Bandwidth Error Amplifier

• Fully–Latched Logic with Double Pulse Suppression

• Latching PWM for Cycle–By–Cycle Current Limiting

• Soft–Start Control with Latched Overcurrent Reset

• Input Undervoltage Lockout with Hysteresis

• Low Start–Up Current (500 µA Typ)

• Internally Trimmed Reference with Undervoltage Lockout

• 90% Maximum Duty Cycle (Externally Adjustable)

• Precision Trimmed Oscillator

• Voltage or Current Mode Operation to 1.0 MHz

• Functionally Similar to the UC3823

Order this document by MC34023/D

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16

1

P SUFFIX

PLASTIC PACKAGE

CASE 648

16

1

DW SUFFIX

PLASTIC PACKAGE

CASE 751G

(SO–16L)

PIN CONNECTIONS

Simplified Application

16

V

ref

4

Clock

5

R

T

C

T

Ramp

Error Amp

Output

Noninverting

Input

Inverting

Input

Soft–Start

Oscillator

6

7

3

2

1
8

Error
Amp

Soft–Start

This device contains 176 active transistors.

MOTOROLA ANALOG IC DEVICE DATA

5.1V

Reference

UVLO

Latching

PWM

Ground

10

15

V

CC

13

V

C

14

Output

12

Power
Ground

11

Current
Limit Ref

9

Current
Limit/
Shutdown

Error Amp

Inverting Input

Error Amp

Noninverting Input

Error Amp Output

Clock

R

T

C

T

Ramp

Soft–Start

1
2
3
4
5
6
7

8

(Top View)

16

V

ref

15

V

CC

14

Output

13

V

C

12

Power Ground
Current Limit

11

Reference
Ground

10

Current Limit/

9

Shutdown

ORDERING INFORMATION

Operating

Device

MC33023P Plastic DIP
MC33023DW SO–16L
MC34023P TA = 0° to +70°C Plastic DIP

 Motorola, Inc. 1996 Rev 2

Temperature Range

TA = –40° to +105°C

Package

1

MC34023 MC33023

DIP Pack

648)

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Supply Voltage V
Output Driver Supply Voltage V
Output Current, Source or Sink (Note 1)

DC

Pulsed (0.5 µs)
Current Sense, Soft–Start, Ramp, and Error Amp Inputs V
Error Amp Output and Soft–Start Sink Current I
Clock and RT Output Current I
Power Dissipation and Thermal Characteristics

SO–16L Package (Case 751G)

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

age (Case
Maximum Power Dissipation @ TA = +25°C
Thermal Resistance, Junction–to–Air

Operating Junction Temperature T
Operating Ambient Temperature (Note 2)

MC34023
MC33023

Storage Temperature Range T

R

R

CC

I

O

O

CO

P

θJA

P

θJA

T

stg

C

–0.3 to +7.0 V

in

D

D

J

A

0 to +70

–40 to +105
–55 to +150 °C

30 V
20 V

0.5

2.0

10 mA

5.0 mA

862
145

1.25
100

mW

°C/W

W

°C/W

+150 °C

°C

A

ELECTRICAL CHARACTERISTICS (V

= 15 V , RT = 3.65 kΩ, CT = 1.0 nF, for typical values TA = +25°C, for min/max values TA is

CC

the operating ambient temperature range that applies [Note 2], unless otherwise noted.)

Characteristic

Symbol Min Typ Max Unit

REFERENCE SECTION

Reference Output Voltage (IO = 1.0 mA, TJ = +25°C) V
Line Regulation (VCC = 10 V to 30 V) Reg
Load Regulation (IO = 1.0 mA to 10 mA) Reg
T emperature Stability T
Total Output V ariation over Line, Load, and Temperature V
Output Noise Voltage (f = 10 Hz to 10 kHz, TJ = +25°C) V

ref

line
load
S

ref

n

5.05 5.1 5.15 V
– 2.0 15 mV
– 2.0 15 mV
– 0.2 – mV/°C

4.95 – 5.25 V
– 50 – µV

Long Term Stability (TA = +125°C for 1000 Hours) S – 5.0 – mV
Output Short Circuit Current I

SC

– 30 –65 –100 mA

OSCILLATOR SECTION

Frequency

TJ = +25°C
Line (VCC = 10 V to 30 V) and Temperature (TA = T

low

to T

high

)
Frequency Change with Voltage (VCC = 10 V to 30 V) ∆f
Frequency Change with Temperature (TA = T

low

to T

) ∆f

high

Sawtooth Peak Voltage V
Sawtooth Valley Voltage V

f

osc

/∆V – 0.2 1.0 %

osc

/∆T – 2.0 – %

osc
OSC(P)
OSC(V)

380
370

400
400

420
430

2.6 2.8 3.0 V

0.7 1.0 1.25 V

Clock Output Voltage

High State
Low State

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

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

=0°C for MC34023 T

low

T

= –40°C for MC33023 T

low

= +70°C for MC34023

high

= +105°C for MC33023

high

V

OH

V

OL

3.9
–

2.3

4.5

–

2.9

kHz

V

2

MOTOROLA ANALOG IC DEVICE DATA

MC34023 MC33023

ELECTRICAL CHARACTERISTICS (V

= 15 V , RT = 3.65 kΩ, CT = 1.0 nF, for typical values TA = +25°C, for min/max values TA is

CC

the operating ambient temperature range that applies [Note 2], unless otherwise noted.)

Characteristic

Symbol Min Typ Max Unit

ERROR AMPLIFIER SECTION

Input Offset Voltage V
Input Bias Current I
Input Offset Current I
Open–Loop Voltage Gain (VO = 1.0 V to 4.0 V) A

IO
IB
IO

VOL

– – 15 mV
– 0.6 3.0 µA
– 0.1 1.0 µA

60 95 – dB
Gain Bandwidth Product (TJ = +25°C) GBW 4.0 8.3 – MHz
Common Mode Rejection Ratio (VCM = 1.5 V to 5.5 V) CMRR 75 95 – dB
Power Supply Rejection Ratio (VCC = 10 V to 30 V) PSRR 85 110 – dB
Output Current, Source (VO = 4.0 V)

Output Current, Sink (VO = 1.0 V)

Output Voltage Swing, High State (IO = –0.5 mA)

Output Voltage Swing, Low State (IO = 1 mA)

I

Source

I

Sink

V

OH

V

OL

0.5

1.0

4.5
0

3.0

3.6

4.75

0.4

–
–

5.0

1.0

Slew Rate SR 6.0 12 – V/µs

PWM COMPARATOR SECTION

Ramp Input Bias Current I
Duty Cycle, Maximum

Duty Cycle, Minimum

DC

DC
Zero Duty Cycle Threshold Voltage Pin 3(4) (Pin 7(9) = 0 V) V
Propagation Delay (Ramp Input to Output, TJ =+25°C) t

PLH(in/out)

IB

(max)

(min)

th

– –0.5 –5.0 µA

80

–

90

–

0

–

1.1 1.25 1.4 V
– 60 100 ns

SOFT–START SECTION

Charge Current (V

Soft–Start

Discharge Current (V

= 0.5 V) I

Soft–Start

= 1.5 V) I

chg

dischg

3.0 9.0 20 µA

1.0 4.0 – mA

CURRENT SENSE SECTION

Input Bias Current (Pin 9(12) = 0 V to 4.0 V) I
Current Limit Comparator Input Offset Voltage (Pin 11(14) = 1.1 V) V
Current Limit Reference Input Common Mode Range (Pin 11(14)) V
Shutdown Comparator Threshold V
Propagation Delay (Current Limit/Shutdown to Output, TJ =+25°C) t

PLH(in/out)

IB

IO

CMR

th

– – 15 µA
– – 45 mV

1.0 – 1.25 V

1.25 1.40 1.55 V
– 50 80 ns

OUTPUT SECTION

Output Voltage

Low State (I

High State (I

Sink

(I

Sink
Source

(I

Source

= 20 mA)
= 200 mA)

= 20 mA)
= 200 mA)

Output Voltage with UVLO Activated (VCC = 6.0 V, I

= 0.5 mA) V

Sink

V

V

OL(UVLO)

Output Leakage Current (VC = 20 V) I
Output Voltage Rise T ime (CL = 1.0 nF, TJ = +25°C) t
Output Voltage Fall T ime (CL = 1.0 nF, TJ = +25°C) t

OL

OH

L

r

f

–
–

13
12

0.25

1.2

13.5
13

0.4

2.2
–
–

– 0.25 1.0 V
– 100 500 µA
– 30 60 ns
– 30 60 ns

UNDERVOLTAGE LOCKOUT SECTION

Start–Up Threshold (VCC Increasing) V
UVLO Hysteresis Voltage (VCC Decreasing After Turn–On) V

th(on)

H

8.8 9.2 9.6 V

0.4 0.8 1.2 V

TOTAL DEVICE

Power Supply Current

Start–Up (VCC = 8.0 V)
Operating

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

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

=0°C for MC34023 T

low

T

= –40°C for MC33023 T

low

= +70°C for MC34023

high

= +105°C for MC33023

high

I

CC

–
–

0.5
20

1.2
30

mA

V

%

V

mA

MOTOROLA ANALOG IC DEVICE DATA

3

100 k

1 3 5 7

Ω

CT =

1. 100 nF

10 k

2. 47 nF

3. 22 nF

4. 10 nF

5. 4.7 nF

, TIMING RESISTOR ( )

6. 2.2 nF

T

R

7. 1.0 nF

1.0 k

8. 470 pF

9. 220 pF

470

100 1000

Figure 1. Timing Resistor versus

Oscillator Frequency

9

2 4 6 8

4

10

f

, OSCILLAT OR FREQUENCY (Hz)

osc

10

5

VCC = 15 V
TA = +25

10

MC34023 MC33023

Figure 2. Oscillator Frequency versus T emperature

1200

°

C

6

10

7

1000

800

600

400

, OSCILLAT OR FREQUENCY (kHz)f

200

osc

0

– 55 – 25 0 25 50 75

VCC = 15 V

1.0 MHz

400 kHz

50 kHz

TA, AMBIENT TEMPERATURE (°C)

RT = 1.2 k
CT = 1.0 nF

RT = 3.6 k
CT = 1.0 nF

RT = 36 k
CT = 1.0 nF

100 125

Figure 3. Error Amp Open Loop Gain and

Phase versus Frequency

120
100

80
60
40
20

, OPEN LOOP VOL TAGE GAIN (dB)

0

VOL

A

–20

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

Phase

Gain

f, FREQUENCY (Hz)

Figure 5. Error Amp Small Signal

Transient Response

2.55 V

0

45

90

θ

135

1.30

1.28

C)

°

1.26

1.24

, ZERO DUTY CYCLE (V)

, EXCESS PHASE (

TH

1.22

V

1.20
– 55 – 25 0 25 50 75 100

3.0 V

Figure 4. PWM Comparator Zero Duty Cycle

Threshold V oltage versus Temperature

VCC = 15 V
Pin 7(9) = 0 V

°

TA, AMBIENT TEMPERATURE (

C)

Figure 6. Error Amp Large Signal

Transient Response

125

2.5 V

2.45 V

4

2.5 V

2.0 V

0.1 µs/DIV 0.1 µs/DIV

MOTOROLA ANALOG IC DEVICE DATA

MC34023 MC33023

Figure 7. Reference V oltage Change

0

– 5.0

VCC = 15 V

–10

–15

–20

–25

, REFERENCE VOLTAGE CHANGE (mV)

ref

V

–30

0

10 20 30 40 50

Figure 9. Reference Line Regulation Figure 10. Reference Load Regulation

versus Source Current

TA = – 55°C

TA = +125°C

I

, SOURCE CURRENT (mA)

Source

TA = +25°C

65.6

65.2

64.8

64.4

, REFERENCE SHORT CIRCUIT CURRENT (mA)

SC

I

Figure 8. Reference Short Circuit Current

versus T emperature

66

VCC = 15 V

64
–55

– 25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (

°

C)

– 100

, CURRENT LIMIT INPUT OFFSET VOLTAGE (mV)V

IO

100

60

20

–20

–60

2.0 mV/DIV

V

LINE REGULA TION 10 V to 24 V

ref

(2.0 ms/DIV)

Figure 11. Current Limit Comparator Input

Offset Voltage versus Temperature

VCC = 15 V
Pin 11(14) = 1.1 V

TA, AMBIENT TEMPERATURE (°C)

2.0 mV/DIV

V

LOAD REGULATION 1.0 mA to 10 mA

ref

Figure 12. Shutdown Comparator Threshold

V oltage versus Temperature

1.50

VCC = 15 V

1.46

1.42

1.38

, THRESHOLD VOLTAGE (V)V

1.34

th

1.30

100 0

– 55 – 25 25 50 75 100 125– 55 – 25 0 25 50 75 125

TA, AMBIENT TEMPERATURE (

(2.0 ms/DIV)

°

C)

MOTOROLA ANALOG IC DEVICE DATA

5

MC34023 MC33023

Figure 13. Soft–Start Charge Current

versus T emperature

A)

10

µ

, SOFT-ST ART CHARGE CURRENT (
I

chg

9.5

9.0

8.5

8.0

7.5

7.0

VCC = 15 V

– 55 – 25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (°C)

Figure 15. Drive Output Rise and Fall Time Figure 16. Drive Output Rise and Fall Time

Figure 14. Output Saturation Voltage

versus Load Current

0

– 1.0

VCC = 15 V

µ

s Pulsed Load

80
120 Hz Rate

– 2.0

, OUTPUT SA TURATION VOLTAGE (V)

sat

V

2.0

1.0

0

°

C

TA = 25

0 0.2 0.4 0.6 0.8 1.0

V

IO, OUTPUT LOAD CURRENT (A)

CC

Ground

Source Saturation

(Load to Ground)

Sink Saturation

(Load to VCC)

OUTPUT RISE & FALL TIME 1.0 nF LOAD

50 ns/DIV

Figure 17. Supply V oltage versus Supply Current

30

25

20

15

10

, SUPPLY CURRENT (mA)

CC

5.0

I

RT = 3.65 k
CT = 1.0 nF

VCC Decreasing

0

0 4.0 8.0 12 16 20

OUTPUT RISE & FALL TIME 10 nF LOAD

50 ns/DIV

Ω

VCC Increasing

VCC, SUPPLY VOLTAGE (V)

6

MOTOROLA ANALOG IC DEVICE DATA