MOTOROLA MC44602P2 Datasheet



SEMICONDUCTOR

TECHNICAL DATA

HIGH PERFORMANCE

CURRENT MODE

CONTROLLER

PIN CONNECTIONS

Order this document by MC44602/D

P2 SUFFIX

PLASTIC PACKAGE

CASE 648C

DIP (12 + 2 + 2)

16

1

(T op View)

Compensation

Load Detect Input

Voltage Feedback Input

Sink Gnd

Current Sense Input

Sync Input

RT/C

T

V

ref

V

CC

Sink Gnd

Source Output

Gnd

V

C

Sink Output

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

Device

Operating

Temperature Range

Package

ORDERING INFORMATION

MC44602 TA = –25 to 85°C DIP (12 + 2 + 2)

1

MOTOROLA ANALOG IC DEVICE DATA

  
  

The MC44602 is an enhanced high performance fixed frequency current
mode controller that is specifically designed for off–line and high voltage
dc–to–dc converter applications. This device has the unique ability of
changing operating modes if the converter output is overloaded or shorted,
offering the designer additional protection for increased system reliability.
The MC44602 has several distinguishing features when compared to
conventional current mode controllers. These features consist of a foldback
amplifier for overload detection, valid load and demag comparators with a
fault latch for short circuit detection, thermal shutdown, and separate high
current source and sink outputs that are ideally suited for driving a high
voltage bipolar power transistor, such as the MJE18002, MJE18004, or
MJE18006.

Standard features include an oscillator with a sync input, a temperature
compensated reference, high gain error amplifier, and a current sensing
comparator. Protective features consist of input and reference undervoltage
lockouts each with hysteresis, cycle–by–cycle current limiting, a latch for
single pulse metering, and a flip–flop which blanks the output off every other
oscillator cycle, allowing output deadtimes to be programmed from 50% to
70%. This device is manufactured in a 16 pin dual–in–line heat tab package
for improved thermal conduction.

• Separate High Current Source and Sink Outputs Ideally Suited for

Driving Bipolar Power Transistors: 1.0 A Source, 1.5 A Sink

• Unique Overload and Short Circuit Protection

• Thermal Protection

• Oscillator with Sync Input

• Current Mode Operation to 500 kHz Output Switching Frequency

• Output Deadtime Adjustable from 50% to 70%

• Automatic Feed Forward Compensation

• Latching PWM for Cycle–By–Cycle Current Limiting

• Input and Reference Undervoltage Lockouts with Hysteresis

• Low Startup and Operating Current

Simplified Block Diagram

Error

Amplifier

Foldback
Amplifier

16

V

ref

7

Sync Input

8

RT/C

T

1

Compensation

3

Voltage Feedback–Input

V

ref

Undervoltage

Lockout

5.0V

Reference

V

CC

Undervoltage

Lockout

Short Circuit

Detection

Oscillator

Flip Flop

and

Latching

PWM

Thermal

Gnd 9

15

V

CC

2

11

6

Load Detect Input

14

V

C

Source Output

10

Sink Output

4, 5, 12, 13

Sink Ground

Current Sense Input

 Motorola, Inc. 1996 Rev 0

MC44602

2

MOTOROLA ANALOG IC DEVICE DATA

MAXIMUM RATINGS

Rating Symbol Value Unit

Total Power Supply and Zener Current (ICC + IZ) 30 mA
Sink Ground Voltage

with Respect to Gnd (Pin 9)

V

Sink(neg)

–5.0 V

Output Supply Voltage

with Respect to Sink Gnd (Pins 4, 5, 12, 13)

V

C

20 V

Output Current (Note 1)

Source
Sink

I

O(Source)

I

O(Sink)

1.0

1.5

A

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

in

–0.3 to 5.5 V

Sync Input

High State Voltage
Low State Reverse Current

V

IH

I

IL

5.5

–20

V

mA

Load Detect Input Current I

in

–20 to +10 mA

Error Amplifier Output Sink Current IEA

(Sink)

10 mA

Power Dissipation and Thermal Characteristics

Maximum Power Dissipation at TA = 25°C
Thermal Resistance, Junction–to–Air
Thermal Resistance, Junction–to–Case

P

D

R

θJA

R

θJC

2.5
80
15

W

°C/W
°C/W

Operating Junction Temperature T

J

150 °C

Operating Ambient Temperature T

A

–25 to +85 °C

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

ELECTRICAL CHARACTERISTICS (V

CC

and VC = 12 V [Note 2], RT = 10k, CT = 1.0 nF, for typical values TA = 25°C, for min/max

values TA = –25°C to +85°C [Note 3] unless otherwise noted.)

Characteristic

Symbol Min Typ Max Unit

ERROR AMPLIFIER SECTION

Voltage Feedback Input (VO = 2.5V) V

FB

2.45 2.5 2.65 V

Input Bias Current (VFB = 2.5 V) I

IB

– –0.6 –2.0 µA

Open Loop Voltage Gain (VO = 2.0 V to 4.0 V) A

VOL

65 90 – dB

Unity Gain Bandwidth

TJ = 25°C
TA = –25 to +85°C

BW

1.0

0.8

1.4
–

1.8

2.0

MHz

Power Supply Rejection Ratio (VCC = 10 V to 16 V) PSRR 65 70 – dB
Output Current

Sink (VO = 1.5 V , VFB = 2.7 V)

Sink TJ = 25°C
Sink TA = –25 to +85°C

Source (VO = 5.0 V , VFB = 2.3 V)

Source TJ = 25°C
Source TA = –25 to +85°C

I

Sink

I

Source

–

1.5

–

–2.0

5.0
–

–1.1

–

–

10

–

–0.2

mA

Output Voltage Swing

High State (I

O(Source)

= 0.5 mA, VFB = 2.3 V)

Low State (I

O(Sink)

= 0.33 mA, VFB = 2.7 V)

V

OH

V

OL

6.0
–

7.0

1.0

–

1.1

V

NOTES: 2. Adjust VCC above the startup threshold before setting to 12V.

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

MC44602

3

MOTOROLA ANALOG IC DEVICE DATA

ELECTRICAL CHARACTERISTICS (V

CC

and VC = 12 V [Note 2], RT = 10k, CT = 1.0 nF, for typical values TA = 25°C, for min/max

values TA = –25°C to +85°C [Note 3] unless otherwise noted.)

Characteristic

Symbol Min Typ Max Unit

OSCILLATOR SECTION

Frequency

TJ = 25°C
TA = –25°C to +85°C

f

OSC

168
160

180

–

192
200

kHz

Frequency Change with Voltage (VCC = 12 V to 18 V) ∆f

OSC

/∆V – 0.1 0.2 %/V

Frequency Change with Temperature ∆f

OSC

/∆T – 0.05 – %/°C

Oscillator Voltage Swing (Peak–to–Peak) V

OSC(pp)

1.3 1.6 – V

Discharge Current (V

OSC

= 3.0 V)
TJ = 25°C
TA = –25°C to +85°C

I

dischg

6.5

6.0

10

–

13.5
14

mA

Sync Input Threshold Voltage

High State
Low State

V

IH

V

IL

2.5

1.0

2.8

1.3

3.2

1.7

V

Sync Input Resistance

TJ = 25°C
TA = –25°C to +85°C

R

in

6.5

6.0

10

–

13.5
18

kΩ

REFERENCE SECTION

Reference Output Voltage (IO = 1.0 mA) V

ref

4.7 5.0 5.3 V

Line Regulation (VCC = 12 V to 18 V) Reg

line

– 1.0 10 mV

Load Regulation (IO = 1.0 mA to 20 mA) Reg

load

– 3.0 15 mV

T emperature Stability T

S

– 0.2 – mV/°C

Total Output Variation over Line, Load and Temperature V

ref

4.65 – 5.35 V

Output Noise Voltage (f = 10 Hz to 10 kHz, TJ = 25°C) V

n

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

TJ = 25°C
TA = –25°C to +85°C

I

SC

–

–70

–130

–

–

–180

mA

CURRENT SENSE SECTION

Current Sense Input Voltage Gain (Notes 4 & 5)

TJ = 25°C
TA = –25°C to +85°C

A

V

2.85

2.7

3.0
–

3.15

3.2

V/V

Maximum Current Sense Input Threshold (Note 4) V

th

0.9 1.0 1.1 V

Input Bias Current I

IB

– –4.0 –10 µA

Propagation Delay (Current Sense Input to Sink Output) t

PLH(in/out)

– 100 150 ns

UNDERVOLTAGE LOCKOUT SECTIONS

Startup Threshold (VCC Increasing) V

th

13 14.1 15 V

Minimum Operating Voltage After Turn–On (VCC Decreasing) V

CC(min)

9.0 10.2 11 V

Reference Undervoltage Threshold (V

ref

Decreasing) V

ref

(UVLO) 3.0 3.35 3.7 V

NOTES: 2.Adjust VCC above the startup threshold before setting to 12V.

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

4.This parameter is measured at the latch trip point with IFB = –5.0

µA, refer to Figure 9.

5.Comparator gain is defined as AV =

∆V Current Sense Input

∆V Compensation

MC44602

4

MOTOROLA ANALOG IC DEVICE DATA

ELECTRICAL CHARACTERISTICS

(V

CC

and VC = 12 V [Note 2], RT = 10k, CT = 1.0 nF, for typical values TA = 25°C, for min/max

values TA = –25°C to +85°C [Note 3] unless otherwise noted.)

Characteristic

Symbol Min Typ Max Unit

OUTPUT SECTION

Output Voltage (TA = 25°C)

Low State (I

Sink

= 100 mA)

Low State (I

Sink

= 1.0A)

Low State (I

Sink

= 1.5 A)

High State (I

Source

= 50 mA)

High State (I

Source

= 0.5 A)

High State (I

Source

= 0.75 A)

V

OL

(VCC–VOH)

–
–
–

–
–
–

0.6

1.8

2.1

1.4

1.7

1.8

0.3

2.0

2.6

1.7

2.0

2.2

V

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

Sink

= 1.0 mA) V

OL(UVLO)

– 0.1 1.1 V

Output Voltage Rise T ime (CL = 1.0 nF, TJ = 25°C) t

r

– 50 150 ns

Output Voltage Fall T ime (CL = 1.0 nF, TJ = 25°C) t

f

– 50 150 ns

PWM SECTION

Duty Cycle

Maximum
Minimum

DC

(max)

DC

(min)

46

–

48

–

50

0

%

TOTAL DEVICE

Power Supply Current

Startup (VCC = 5 V)
Operating (Note 2)

TJ = 25° C
TA = –25°C to +85° C

I

CC

–

–

10

0.2

17

–

0.5

20
22

mA

Power Supply Zener Voltage (ICC = 25 mA) V

Z

18 20 23 V

OVERLOAD AND SHORT CIRCUIT PROTECTION

Foldback Amplifier Threshold (Figures 9,10) ∆V

FB

(VFB–100) (VFB–200) (VFB–300) mV

Load Detect Input

Valid Load Comparator Threshold (V

Pin 2

Increasing)

Demag Comparator Threshold (V

Pin 2

Decreasing)
Propagation Delay (Input to Sink or Source Output)
Input Resistance

V

th(VL)

V

th(Demag)

t

PLH(in/out)

R

in

2.0
50

–

12

2.5
88

1.1
18

3.0

120

1.6
30

V

mV

µS
kΩ

NOTES: 2. Adjust VCC above the startup threshold before setting to 12V.

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

Figure 1. Timing Resistor

versus Oscillator Frequency

0.8

2.0

5.0

8.0

20

50

80

R

T

, TIMING RESISTOR (k )

Ω

1.0 M500 k200 k100 k50 k20 k10 k

f

OSC

, OSCILLATOR FREQUENCY (Hz)

CT=100 pF

CT=500 pF

Figure 2. Output Deadtime

versus Oscillator Frequency

1.0 M100 k10 k

f

OSC

, OSCILLATOR FREQUENCY (Hz)

50

% DT, PERCENT OUTPUT DEADTIME

1

2

3

4

5

55

60

65

70

75

Ä

6

30

10

3.0

1.0
20 k 50 k 200 k 500 k

Note: Output switches at
one–half the oscillator
frequency .

VCC = 12 V
TA = 25

°

C

CT=10 nF

CT=1.0 nF

CT=200 pF

CT=2.0 nF

VCC = 12 V
TA = 25

°

C

Note: Output switches at
one–half the oscillator frequency.

CT=5.0 nF

ÄÄÄÄ

ÄÄÄÄ

ÄÄÄÄ

1. CT = 10 nF

2. CT = 5.0 nF

3. CT = 2.0 nF

4. CT = 1.0 nF

5. CT = 500 pF

6. CT = 100 pF

MC44602

5

MOTOROLA ANALOG IC DEVICE DATA

OSC

Figure 3. Oscillator Discharge Current

versus Temperature

, DISCHARGE CURRENT (mA)

–55

TA, AMBIENT TEMPERATURE (

°

C)

–25 0 25 50 75 100 125

dischg

I

12

VCC = 12 V
V

OSC

= 3.0 V

Figure 4. Oscillator Voltage Swing

versus Temperature

–20

A

VOL

, OPEN LOOP VOL TAGE GAIN (dB)

10 M0.1 k

f, FREQUENCY (Hz)

Gain

Phase

0

30

60

90

120

150

180

1.0 k 10 k 100 k 1.0 M

0

20

40

60

80

100

EXCESS PHASSE (DEGREES)

Figure 5. Error Amp Small Signal

Transient Response

0

VO, ERROR AMP OUTPUT VOLTAGE (V)

0

, CURRENT SENSE INPUT THRESHOLD (V)V

th

0.2

0.4

0.6

0.8

1.0

1.2

2.0 4.0 6.0

VCC = 12 V

TA = 25°C

TA = 125°C

TA = –40°C

Figure 6. Error Amp Large Signal

Transient Response

Figure 7. Error Amp Open Loop Gain and

Phase versus Frequency

Figure 8. Current Sense Input Threshold versus

Error Amp Output Voltage

, OSCILLATOR VOLTAGE SWING (V)V

5.0

4.0

3.0

2.0

1.0

0

–55

TA, AMBIENT TEMPERATURE (

°

C)

–25 0 25 50 75 100 125

VCC = 12 V
RT = 10 k
CT = 1.0 nF

Peak Voltage

Valley Voltage

1.0 3.0 5.0 7.0

11

10

9.0

8.0

7.0

VCC = 12 V
VO = 2.0 V to 4.0 V
RL = 100 k
TA = 25

°

C

2.55 V

2.5 V

2.45 V

3.0 V

2.5 V

2.0 V

t, TIME (0.5

µ

s/DIV) t, TIME (1.0 µs/DIV)

VCC = 12 V
AV = –1.0
TA = 25

°

C

VCC = 12 V
AV = –1.0
TA = 25

°

C

20 mV/DIV

200 mV/DIV

MC44602

6

MOTOROLA ANALOG IC DEVICE DATA

, REFERENCE VOLTAGE CHANGE (mV)

ref

V

∆

80

Figure 9. Voltage Feedback Input,

Voltage versus Current

0

0

100

R

JA

, THERMAL RESISTANCE JUNCTION TO AIR ( C/W)

θ

80

60

40

20

10 20 30 40 50

L, LENGTH OF COPPER (mm)

°

R

θ

JA

P

D

, MAXIMUM POWER DISSIPATION (W)

5.0

4.0

3.0

2.0

1.0

0

P

D(max)

for TA = 70°C

Figure 10. Voltage Feedback Input

versus Current Sense Clamp Level

Figure 11. Reference Short Circuit Current

versus Temperature

Figure 12. Reference Line and Load

Regulation versus Temperature

Figure 13. Reference Voltage Change

versus Source Current

Figure 14. Thermal Resistance and Maximum

Power Dissipation versus P.C.B. Copper Length

, INPUT VOLTAGE (V)

1.0
–500

Iin, INPUT CURRENT (

µ

A)

in

V

1.4

1.8

2.2

2.6

–400 –300 –200 –100 0

V

Clamp

= 1.0 V

V

Clamp

= 0.7 V

V

Clamp

= 0.3 V

VCC = 12 V
TA = 25

°

C

V

Clamp

= 0.1 V

V

Clamp

= 0.5 V

, INPUT VOLTAGE (V)

in

V

1.0
0

V

Clamp

, CURRENT SENSE CLAMP LEVEL (V)

1.4

1.8

2.2

2.6

0.2 0.4 0.6 0.8 1.0

TA = 125°C

VCC = 12 V

TA = –55°C

, REFERENCE SHORT CIRCUIT CURRENT (mA)

SC

I

40

–55

TA, AMBIENT TEMPERATURE (

°

C)

120

160

200

–25 0 25 50 75 100 125

VCC = 12 V
RL

≤

0.1

Ω

, REFERENCE VOLTAGE CHANGE (mA)

ref

V

3.0

–55

TA, AMBIENT TEMPERATURE (

°

C)

–25 0 25 50 75 100 125

∆

2.0

1.0

0
–1.0
–2.0

–3.0
–4.0
–5.0

Line Regulation
VCC = 12 V to 18 V
I

ref

= 0 mA

0

I

ref

, REFERENCE SOURCE CURRENT (mA)

0

30 60 90 120 150 180

–5.0

–10

–15

–20

–25

–30

TA = 125°C

TA = 25°C

TA = –55°C

Load Regulation
VCC = 12 V
I

ref

= 1.0 mA to 20 mA

TA = 25°C

VCC = 12 V

Graphs represent symmetrical layout

3.0 mm

Printed circuit board heatsink example

L

L

2.0 oz

Copper