MC44603AP_技术文档

Order this document by MC44603A/D

MIXED FREQUENCY MODE

GREENLINE PWM*

CONTROLLER:

Fixed Frequency, Variable Frequency,

Standby Mode

VARIABLE FREQUENCY,

FIXED FREQUENCY,

STANDBY MODE

The MC44603A is an enhanced high performance controller that is

specifically designed for off–line and dc–to–dc converter applications. This

device has the unique ability of automatically changing operating modes if

the converter output is overloaded, unloaded, or shorted, offering the

designer additional protection for increased system reliability. The

MC44603A has several distinguishing features when compared to

conventional SMPS controllers. These features consist of a foldback facility

for overload protection, a standby mode when the converter output is slightly

loaded, a demagnetization detection for reduced switching stresses on

transistor and diodes, and a high current totem pole output ideally suited for

driving a power MOSFET. It can also be used for driving a bipolar transistor

in low power converters (< 150 W). It is optimized to operate in

discontinuous mode but can also operate in continuous mode. Its advanced

design allows use in current mode or voltage mode control applications.

* PWM = Pulse Width Modulation

16

1

P SUFFIX

PLASTIC PACKAGE

CASE 648

Current or Voltage Mode Controller

• Operation up to 250 kHz Output Switching Frequency

• Inherent Feed Forward Compensation

• Latching PWM for Cycle–by–Cycle Current Limiting

• Oscillator with Precise Frequency Control

High Flexibility

16

1

DW SUFFIX

PLASTIC PACKAGE

CASE 751G

• Externally Programmable Reference Current

• Secondary or Primary Sensing

(SOP–16L)

• Synchronization Facility

• High Current Totem Pole Output

• Undervoltage Lockout with Hysteresis

Safety/Protection Features

PIN CONNECTIONS

V

1

2

16

15

14

R

CC

ref

• Overvoltage Protection Against Open Current and Open Voltage Loop

• Protection Against Short Circuit on Oscillator Pin

• Fully Programmable Foldback

Frequency

V

C

Standby

Voltage Feedback

Input

Output

Gnd

3

4

5

13 Error Amp Output

• Soft–Start Feature

R

Foldback Input

12

Power Standby

• Accurate Maximum Duty Cycle Setting

• Demagnetization (Zero Current Detection) Protection

• Internally Trimmed Reference

Overvoltage

Protection (OVP)

Soft–Start/D

Voltage Mode

/

max

6

7

11

10

Current Sense Input

C

T

• Enhanced Output Drive

Demag Detection

8

9

Sync Input

GreenLine Controller: Low Power Consumption in Standby Mode

• Low Startup and Operating Current

• Fully Programmable Standby Mode

• Controlled Frequency Reduction in Standby Mode

• Low dV/dT for Low EMI Radiations

(Top View)

ORDERING INFORMATION

Operating

Temperature Range

Device

Package

Plastic DIP–16

SOP–16L

GreenLine is a trademark of Motorola, Inc.

MC44603AP

MC44603ADW

T

A

= –25° to +85°C

Motorola, Inc. 1999

Rev 1

1

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

MAXIMUM RATINGS

Rating

Symbol

Value

Unit

mA

V

Total Power Supply and Zener Current

(I

CC

+ I )

Z

30

18

Supply Voltage with Respect to Ground (Pin 4)

V

C

V

CC

Output Current (Note 1)

mA

Source

Sink

I

–750

750

O(Source)

I

O(Sink)

Output Energy (Capacitive Load per Cycle)

W

5.0

µJ

V

R

, C , Soft–Start, R , R

F Stby ref P Stby

Inputs

V

–0.3 to 5.5

T

in

Foldback Input, Current Sense Input,

E/A Output, Voltage Feedback Input,

V

in

–0.3 to

Overvoltage Protection, Synchronization Input

V

+ 0.3

CC

Synchronization Input

High State Voltage

V

IH

+ 0.3

V

CC

Low State Reverse Current

V

IL

–20

mA

Demagnetization Detection Input Current

mA

Source

Sink

I

–4.0

10

demag–ib (Source)

I

demag–ib (Sink)

Error Amplifier Output Sink Current

I

20

mA

E/A (Sink)

Power Dissipation and Thermal Characteristics

P Suffix, Dual–In–Line, Case 648

Maximum Power Dissipation at T = 85°C

P

D

0.6

W

A

Thermal Resistance, Junction–to–Air

R

100

°C/W

θJA

DW Suffix, Surface Mount, Case 751G

Maximum Power Dissipation at T = 85°C

P

0.45

145

W

°C/W

A

D

Thermal Resistance, Junction–to–Air

Operating Junction Temperature

Operating Ambient Temperature

R

θJA

T

150

°C

J

T

A

–25 to +85

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

2. ESD data available upon request.

ELECTRICAL CHARACTERISTICS (V

CC

and V = 12 V, [Note 3], R = 10 kΩ, C = 820 pF, for typical values T = 25°C,

for min/max values T = –25° to +85°C [Note 4], unless otherwise noted.)

C

ref

T

A

Characteristic

OUTPUT SECTION

Symbol

Min

Typ

Max

Unit

Output Voltage (Note 5)

V

Low State (I

= 100 mA)

= 500 mA)

V

OL

–

1.0

1.4

1.2

2.0

Sink

High State (I

= 200 mA)

= 500 mA)

V

OH

–

1.5

2.0

2.7

Source

Output Voltage During Initialization Phase

V

OL

V

CC

V

CC

V

CC

= 0 to 1.0 V, I

= 1.0 to 5.0 V, I

= 5.0 to 13 V, I

= 10 µA

–

0.1

1.0

Sink

= 100 µA

Sink

= 1.0 mA

Output Voltage Rising Edge Slew–Rate (C = 1.0 nF, T = 25°C)

dVo/dT

–

300

–

V/µs

L

J

Output Voltage Falling Edge Slew–Rate (C = 1.0 nF, T = 25°C)

–300

L

J

ERROR AMPLIFIER SECTION

Voltage Feedback Input (V

= 2.5 V)

V

2.42

–2.0

65

2.5

–0.6

70

2.58

–

V

E/A out

= 2.5 V)

FB

Input Bias Current (V

I

µA

dB

FB

Open Loop Voltage Gain (V

FB–ib

= 2.0 to 4.0 V)

A

VOL

–

E/A out

NOTES: 3. Adjust V

above the startup threshold before setting to 12 V.

CC

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

5. V must be greater than 5.0 V.

C

2

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

ELECTRICAL CHARACTERISTICS (continued) (V

CC

and V = 12 V, [Note 3], R = 10 kΩ, C = 820 pF, for typical values T = 25°C,

C ref T A

for min/max values T = –25° to +85°C [Note 4], unless otherwise noted.)

A

Characteristic

ERROR AMPLIFIER SECTION (continued)

Unity Gain Bandwidth

Symbol

Min

Typ

Max

Unit

BW

MHz

T = 25°C

T = –25° to +85°C

J

–

4.0

–

5.5

J

Voltage Feedback Input Line Regulation (V

= 10 to 15 V)

V

–10

–

10

mV

mA

CC

FBline–reg

Output Current

Sink (V

T

A

= 1.5 V, V

= 2.7 V)

I

Sink

2.0

12

–

E/A out

= –25° to +85°C

FB

Source (V

= 5.0 V, V

= 2.3 V)

I

Source

–2.0

–0.2

E/A out

= –25° to +85°C

FB

T

A

Output Voltage Swing

V

High State (I

Low State (I

= 0.5 mA, V

= 2.3 V)

= 2.7 V)

V

OL

5.5

–

6.5

1.0

7.5

1.1

E/A out (source)

= 0.33 mA, V

FB

OH

E/A out (sink)

FB

REFERENCE SECTION

Reference Output Voltage (V

= 10 to 15 V)

V

2.4

–500

–40

2.5

–

2.6

–100

40

V

CC

ref

Reference Current Range (I = V /R , R = 5.0 k to 25 kΩ)

ref ref ref

I

µA

mV

ref

Reference Voltage Over I Range

ref

∆V

–

ref

OSCILLATOR AND SYNCHRONIZATION SECTION

Frequency

f

kHz

OSC

T

A

= 0° to +70°C

= –25° to +85°C

44.5

44

48

–

51.5

52

A

Frequency Change with Voltage (V

= 10 to 15 V)

∆f

/∆V

–

0.05

1.8

–

%/V

%/°C

V

CC

OSC

Frequency Change with Temperature (T = –25° to +85°C)

/∆T

OSC

A

Oscillator Voltage Swing (Peak–to–Peak)

V

1.65

1.95

OSC(pp)

Ratio Charge Current/Reference Current

I

/I

–

charge ref

T

A

= 0° to +70°C (V

= –25° to +85°C

= 2.0 V)

CT

0.375

0.37

0.4

–

0.425

0.43

A

Fixed Maximum Duty Cycle = I

/(I

R F Stby

+ I

)

D

78

80

82

%

–

discharge discharge charge

Ratio Standby Discharge Current versus I (Note 6)

I

/

disch–Stby

T

A

= 0° to +70°C

= –25° to +85°C (Note 8)

I

0.46

0.43

0.53

–

0.6

0.63

A

R F Stby

V

(I

= 100 µA)

V

2.4

18

2.5

21

–

2.6

24

V

kHz

µA

V

R F Stby R F Stby

R F Stby

Frequency in Standby Mode (R

Current Range

(Pin 15) = 25 kΩ)

F

Stby

F Stby

I

–200

–50

R F Stby

Synchronization Input Threshold Voltage (Note 7)

V

3.2

0.45

3.7

0.7

4.3

0.9

inthH

inthL

Synchronization Input Current

I

–5.0

–

0

µA

µs

Sync–in

Minimum Synchronization Pulse Width (Note 8)

UNDERVOLTAGE LOCKOUT SECTION

Startup Threshold

t

0.5

Sync

V

13.6

14.5

15.4

V

stup–th

Output Disable Voltage After Threshold Turn–On (UVLO 1)

V

disable1

T

A

= 0° to +70°C

= –25° to +85°C

8.6

8.3

9.0

–

9.4

9.6

A

Reference Disable Voltage After Threshold Turn–On (UVLO 2)

V

7.0

7.5

8.0

V

disable2

NOTES: 13. Adjust V

above the startup threshold before setting to 12 V.

CC

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

16. Standby is disabled for V < 25 mV typical.

R P Stby

17. If not used, Synchronization input must be connected to Ground.

18. Synchronization Pulse Width must be shorter than t

= 1/f .

OSC

3

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

ELECTRICAL CHARACTERISTICS (continued) (V

CC

and V = 12 V, [Note 3], R = 10 kΩ, C = 820 pF, for typical values T = 25°C,

C ref T A

for min/max values T = –25° to +85°C [Note 4], unless otherwise noted.)

A

Characteristic

Symbol

Min

Typ

Max

Unit

DEMAGNETIZATION DETECTION SECTION (Note 9)

Demagnetization Detect Input

Demagnetization Comparator Threshold (V

Decreasing)

V

50

–

–0.5

65

0.25

–

80

–

mV

µs

µA

Pin 9

Propagation Delay (Input to Output, Low to High)

demag–th

–

Input Bias Current (V

= 65 mV)

I

demag

Negative Clamp Level (I

demag–lb

= –2.0 mA)

C

–

–0.38

0.72

–

V

demag

L(neg)

L(pos)

Positive Clamp Level (I

= 2.0 mA)

SOFT–START SECTION (Note 11)

C

demag

Ratio Charge Current/I

I

/I

–

ref

ss(ch) ref

T

A

= 0° to +70°C

= –25° to +85°C

0.37

0.36

0.4

–

0.43

0.44

A

Discharge Current (V

Clamp Level

= 1.0 V)

I

1.5

2.2

5.0

2.4

–

mA

V

soft–start

discharge

V

2.6

ss(CL)

Duty Cycle (R

Duty Cycle (V

= 12 kΩ)

D

36

–

42

–

49

0

%

soft–start

soft–start (Pin 11)

soft–start 12k

D

soft–start

= 0.1 V)

OVERVOLTAGE SECTION

Protection Threshold Level on V

V

2.42

1.0

2.5

–

2.58

3.0

V

µs

V

OVP

OVP–th

Propagation Delay (V

Protection Level on V

> 2.58 V to V Low)

out

OVP

V

CC

CC prot

T

A

= 0° to +70°C

= –25° to +85°C

16.1

15.9

17

–

17.9

18.1

A

Input Resistance

–

kΩ

T

A

= 0° to +70°C

= –25° to +85°C

1.5

1.4

2.0

–

3.0

3.4

A

FOLDBACK SECTION (Note 10)

Current Sense Voltage Threshold (V

= 0.9 V)

V

0.86

–6.0

0.89

–2.0

0.9

–

V

foldback (Pin 5)

= 0 V)

CS–th

Foldback Input Bias Current (V

I

µA

foldback (Pin 5)

foldback–lb

STANDBY SECTION

Ratio I

/I

R P Stby ref

I

/I

–

R P Stby ref

T

A

= 0° to +70°C

0.37

0.36

0.4

–

0.43

0.44

T

A

= –25° to +85°C

Ratio Hysteresis (V Required to Return to Normal Operation from Standby

h

Operation)

V /V

h

R P Stby

T

A

= 0° to +70°C

= –25° to +85°C

1.42

1.4

1.5

–

1.58

1.6

A

Current Sense Voltage Threshold (V

= 1.0 V)

= 1.2 V)

V

0.28

0.31

0.34

V

R P Stby (Pin 12)

CS–Stby

CURRENT SENSE SECTION

Maximum Current Sense Input Threshold

(V = 2.3 V and V

V

CS–th

0.96

1.0

1.04

feedback (Pin 14) foldback (Pin 6)

Input Bias Current

I

–10

–

–2.0

120

–

µA

CS–ib

–

Propagation Delay (Current Sense Input to Output at V

MOS transistor = 3.0 V)

of

200

ns

TH

TOTAL DEVICE

Power Supply Current

I

mA

CC

Startup (V

Operating T = –25° to +85°C (Note 3)

= 13 V with V

Increasing)

–

13

0.3

17

0.45

20

CC

A

CC

Power Supply Zener Voltage (I

Thermal Shutdown

= 25 mA)

V

18.5

–

V

CC

Z

–

155

°C

NOTES: 13. Adjust V

above the startup threshold before setting to 12 V.

CC

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

19. This function can be inhibited by connecting Pin 8 to Gnd. This allows a continuous current mode operation.

10. This function can be inhibited by connecting Pin 5 to V

11. The MC44603A can be shut down by connecting the Soft–Start pin (Pin 11) to Ground.

.

CC

4

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

Representative Block Diagram

R

ref

F Stby

R

F Stby

15 16

V

ref

Negative

Active

Clamp

R

S

Q

+

UVLO2

Demag

Detect

V

CC

V

aux

8

1

+

18.0 V

+

65 mV

3.7 V

V

Demag Out

Synchro

V

CC

Reference

Block

Sync

Input

14.5 V/7.5 V

V

To Power

Transformer

9

ref

+

V

I

F Stby

V

0.4 I

ref

0.7 V

OSC prot

ref

1.0 V

R

S

V

C

Q

1.6 V

2

C

T

R

S

Q

10

+

V

OSC

Output

C

3.6 V

T

S

3

Q

R

4

V

Out

V

OVP

Thermal

Shutdown

2.0

Delay

µs

Gnd

0.4 I

I

ref

Discharge

V

ref

CC

V

ref

ref ref

0.6 I

ref

0.25

V

ref

V

ref

0.8 I

ref

I

F Stby

0.4 I

0.2 I

ref

0.4 I

ref

11.6 k

5.0

µs

R

Pwr Stby

12

OVP

Delay

6

2.0 k

V

CC

1.0 mA

R

OVP

I

Discharge/2

+

Feed–

back

Current Mirror X2

+

2.5 V

2R

1.6 V

14

+

Error Amplifier

Current

Sense Input

2.5 V

Compen–

sation

7

13

R

1.0 V

UVLO1

5

V

Foldback

CC

2.4 V

5.0 mA

Input

+

9.0 V

11 SS/D

C

/VM

max

= Sink only

= Positive True Logic

R

SS

This device contains 243 active transistors.

5

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

Figure 1. Timing Resistor versus

Oscillator Frequency

Figure 2. Standby Mode Timing Capacitor

versus Oscillator Frequency

100

10000

C

= 100 pF

T

V

= 16 V

V

= 16 V

= 25°C

= 10 k

CC

T

= 25

°C

T

A

C

= 500 pF

R

T

ref

R

= 2.0 k

F Stby

C

= 1000 pF

T

R

= 5.0 k

F Stby

10

1000

300

R

= 27 k

F Stby

R

= 100 k

F Stby

C

= 2200 pF

T

3.0

10 k

100 k

, Oscillator Frequency (Hz)

1.0 M

10 k

100 k

, Oscillator Frequency (Hz)

1.0 M

f

OSC

Figure 3. Oscillator Frequency

versus Temperature

Figure 4. Ratio Charge Current/Reference

Current versus Temperature

52

51

50

49

48

0.43

0.42

0.41

0.40

0.39

47

46

45

44

V

R

C

= 12 V

= 10 k

V

R

C

= 12 V

= 10 k

ref

T

CC

0.38

0.37

ref

= 820 pF

75

T

–50

–25

0

25

50

75

100

–50

–25

0

25

50

100

T , AMBIENT TEMPERATURE (

°C)

T , AMBIENT TEMPERATURE (°C)

A

Figure 5. Output Waveform

Figure 6. Output Cross Conduction

600

400

200

0

70

300

200

100

0

V

C

= 12 V

= 2200 pF

V

C

= 12 V

= 2200 pF

CC

L

CC

L

60

50

40

30

20

10

60

50

40

30

20

10

T

= 25

°C

T = 25°C

A

Current

Voltage

Current

–200

–100

–400

–600

–200

–300

–400

–500

V

O

Voltage

–800

0

I

CC

–10

–1000

1.0

µs/Div

1.0 µs/Div

6

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

Figure 7. Oscillator Discharge Current

versus Temperature

Figure 8. Source Output Saturation Voltage

versus Load Current

500

475

450

425

2.5

2.0

400

375

1.5

1.0

V

R

C

= 12 V

= 10 k

= 820 pF

V

R

C

= 12 V

= 10 k

ref

CC

ref

T

CC

350

325

300

= 820 pF

T

= 25°C

A

–50

–25

0

25

50

75

100

0

100

200

300

400

500

T , AMBIENT TEMPERATURE (

°C)

I , OUTPUT SOURCE CURRENT (mA)

source

A

Figure 9. Sink Output Saturation Voltage

versus Sink Current

Figure 10. Error Amplifier Gain and Phase

versus Frequency

2.0

1.6

80

60

V

= 12 V

CC

Sink Saturation

G = 10

(Load to V

)

140

CC

V

R

= 30 mV

= 2.0 to 4.0 V

= 100 k

in

O

L

1.2

0.8

40

20

T = 25°C

A

50

T

V

80

= 25°C

A

= 12 V

CC

0.4

0

µ

s Pulsed Load

120 Hz Rate

–20

–40

0

1

2

3

4

10

0

100

200

300

400

500

10

f, FREQUENCY (kHz)

10

I

, SINK OUTPUT CURRENT (mA)

sink

Figure 11. Voltage Feedback Input

versus Temperature

Figure 12. Demag Comparator Threshold

versus Temperature

2.60

2.55

80

V

= 12 V

V

= 12 V

CC

75

70

65

60

55

50

G = 10

V

R

= 2.0 to 4.0 V

= 100 k

O

L

2.50

2.45

2.40

–50

–25

0

25

50

75

100

–50

–25

0

25

50

75

100

T , AMBIENT TEMPERATURE (

°C)

T , AMBIENT TEMPERATURE (°C)

A

7

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

Figure 13. Current Sense Gain

versus Temperature

Figure 14. Thermal Resistance and Maximum

Power Dissipation versus P.C.B. Copper Length

100

80

5.0

4.0

3.2

3.1

3.0

Printed circuit board heatsink example

2.0 oz

L

Copper

L

3.0 mm

R

60

40

20

0

3.0

2.0

θ

JA

Graphs represent symmetrical layout

V

R

C

= 12 V

= 10 k

= 820 pF

CC

ref

T

2.9

2.8

P

for T = 70°C

A

D(max)

1.0

0

–50

–25

0

25

50

75

100

0

10

20

30

40

50

T , AMBIENT TEMPERATURE (

°C)

L, LENGTH OF COPPER (mm)

A

Figure 15. Propagation Delay Current Sense

Input to Output versus Temperature

Figure 16. Startup Current versus V

CC

140

120

100

80

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0

V

R

C

= 12 V

= 10 k

= 820 pF

R

= 10 k

ref

CC

ref

T

C

= 820 pF

T

–50

–25

0

25

50

75

100

0

2.0

4.0

6.0

, SUPPLY VOLTAGE (V)

CC

8.0

10

12

14

T , AMBIENT TEMPERATURE (

°C)

V

A

Figure 17. Supply Current versus

Supply Voltage

Figure 18. Power Supply Zener Voltage

versus Temperature

21.5

16

14

12

10

21.0

20.5

8.0

6.0

4.0

2.0

0

20.0

19.5

19.0

T

= 25°C

A

R

C

V

= 10 k

= 820 pF

= 0 V

ref

T

I

= 25 mA

75

CC

FB

CS

V

= 0 V

2.0

4.0

6.0

V

8.0

10

12

14

16

–50

–25

0

25

50

100

, SUPPLY VOLTAGE (V)

T , AMBIENT TEMPERATURE (

°C)

CC

A

8

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

Figure 19. Startup Threshold Voltage

versus Temperature

Figure 20. Disable Voltage After Threshold

Turn–On (UVLO1) versus Temperature

15.5

15.0

9.50

9.25

14.5

14.0

13.5

9.00

8.55

8.50

V

Increasing

V

Decreasing

CC

–50

–25

0

25

50

75

100

–50

–25

0

25

50

75

100

T , AMBIENT TEMPERATURE (

°

C)

T , AMBIENT TEMPERATURE (°

C)

A

Figure 21. Disable Voltage After Threshold

Turn–On (UVLO2) versus Temperature

Figure 22. Protection Threshold Level on

V

versus Temperature

OVP

8.0

7.8

7.6

7.4

2.60

2.55

2.50

2.45

2.40

2.35

2.30

V

= 12 V

CC

V

Decreasing

CC

7.2

7.0

6.8

–50

–25

0

25

50

75

–50

–25

0

25

50

75

100

T , AMBIENT TEMPERATURE (

°

C)

T , AMBIENT TEMPERATURE (°C)

A

Figure 23. Protection Level on V

versus Temperature

Figure 24. Propagation Delay (V

> 2.58 V

CC

OVP

Low) versus Temperature

to V

out

18

17.5

17

3.0

2.5

2.0

R

C

= 10 k

= 820 pF

ref

T

Pin 6 Open

V

= 12 V

= 10 k

= 820 pF

CC

ref

16.5

16

1.5

1.0

R

C

T

–50

–25

0

25

50

75

–50

–25

0

25

50

75

100

T , AMBIENT TEMPERATURE (

°C)

T , AMBIENT TEMPERATURE (°C)

A

9

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

Figure 25. Standby Reference Current

versus Temperature

Figure 26. Current Sense Voltage Threshold

Standby Mode versus Temperature

270

265

260

0.33

0.32

0.31

0.30

255

250

V

R P Stdby (Pin 12)

Voltage Increasing

245

V

R

C

= 12 V

= 10 k

= 820 pF

CC

ref

T

240

235

230

Pin 12 Clamped

at 1.0 V

–50

–25

0

25

50

75

100

–50

–25

0

25

50

75

100

T , AMBIENT TEMPERATURE (

°C)

T , AMBIENT TEMPERATURE (°C)

A

PIN FUNCTION DESCRIPTION

1

Name

Description

This pin is the positive supply of the IC. The operating voltage range after startup is 9.0 to 14.5 V.

The output high state (V ) is set by the voltage applied to this pin. With a separate connection to the

V

CC

2

V

C

OH

power source, it can reduce the effects of switching noise on the control circuitry.

3

4

5

Output

Peak currents up to 750 mA can be sourced or sunk, suitable for driving either MOSFET or Bipolar

transistors. This output pin must be shunted by a Schottky diode, 1N5819 or equivalent.

Gnd

The ground pin is a single return, typically connected back to the power source; it is used as control and

power ground.

Foldback Input

The foldback function provides overload protection. Feeding the foldback input with a portion of the V

CC

voltage (1.0 V max) establishes on the system control loop a foldback characteristic allowing a smoother

startup and sharper overload protection. Above 1.0 V the foldback input is inactive.

6

7

Overvoltage

Protection

When the overvoltage protection pin receives a voltage greater than 17 V, the device is disabled and

requires a complete restart sequence. The overvoltage level is programmable.

Current Sense

Input

A voltage proportional to the current flowing into the power switch is connected to this input. The PWM

latch uses this information to terminate the conduction of the output buffer when working in a current

mode of operation. A maximum level of 1.0 V allows either current or voltage mode operation.

8

9

Demagnetization

Detection

A voltage delivered by an auxiliary transformer winding provides to the demagnetization pin an indication

of the magnetization state of the flyback transformer. A zero voltage detection corresponds to complete

core saturation. The demagnetization detection ensures a discontinuous mode of operation. This

function can be inhibited by connecting Pin 8 to Gnd.

Synchronization

Input

The synchronization input pin can be activated with either a negative pulse going from a level between

0.7 V and 3.7 V to Gnd or a positive pulse going from a level between 0.7 V and 3.7 V up to a level

higher than 3.7 V. The oscillator runs free when Pin 9 is connected to Gnd.

10

11

C

The normal mode oscillator frequency is programmed by the capacitor C choice together with the R

ref

T

resistance value. C , connected between Pin 10 and Gnd, generates the oscillator sawtooth.

T

Soft–Start/D

max

Voltage–Mode

/

A capacitor, resistor or a voltage source connected to this pin limits the switching duty–cycle. This pin

can be used as a voltage mode control input. By connecting Pin 11 to Ground, the MC44603A can be

shut down.

12

R

A voltage level applied to the R pin determines the output power level at which the oscillator will

P Standby

turn into the reduced frequency mode of operation (i.e. standby mode). An internal hysteresis

comparator allows to return in the normal mode at a higher output power level.

P Standby

13

14

E/A Out

Voltage Feedback

The error amplifier output is made available for loop compensation.

This is the inverting input of the Error Amplifier. It can be connected to the switching power supply output

through an optical (or other) feedback loop.

15

16

R

The reduced frequency or standby frequency programming is made by the R

resistance choice.

sets the internal reference current. The internal reference current ranges from 100 µA to 500 µA.

F Standby

ref

F Standby

R

ref

This requires that 5.0 kΩ ≤ R ≤ 25 kΩ.

ref

10

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

Figure 27. Starting Behavior and Overvoltage Management

No–Take Over

Loop Failure

>2.0 µs

Startup

Restart

V

CC

CC prot

stup–th

V

Normal Mode

V

disable1

disable2

V

ref

UVLO1

V

Pin 11

(Soft–Start)

V

OVP Out

Output

I

CC

17 mA

0.3 mA

Figure 28. Demagnetization

V

Demag In

Output

(Pin 3)

V

Demag Out

V

Demag Out

Demagnetization

Management

V

Oscillator

Demag In

Buffer

Output

11

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

Figure 29. Switching Off Behavior

V

CC

stup–th

V

disable1

disable2

V

ref

UVLO1

V

Pin 11

(Soft–Start)

Output

(Pin 3)

I

CC

17 mA

0.3 mA

Figure 30. Oscillator

3.6 V

1.6 V

V

CT

1.0 V

V

Stby

V

Demag Out

V

OSC

V

OSC prot

V

Demag Out

V

Synchronization

Input

OSC prot

Oscillator

V

OSC

C

T

V

Stby

12

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

Figure 31. Soft–Start & D

max

V

ref

V

+ 1.6 V

CSS

Internal Clamp

Soft–Start

External Clamp

V

3.6 V

CT

V

low 1.6 V

CT

V

OSC

Output

(Pin 3)

OPERATING DESCRIPTION

Error Amplifier

Figure 32. Error Amplifier Compensation

A fully compensated Error Amplifier with access to the

inverting input and output is provided. It features a typical dc

voltage gain of 70 dB. The noninverting input is internally

biased at 2.5 V and is not pinned out. The converter output

voltage is typically divided down and monitored by the

inverting input. The maximum input bias current with the

inverting input at 2.5 V is –2.0 µA. This can cause an output

voltage error that is equal to the product of the input bias

current and the equivalent input divider source resistance.

The Error Amp output (Pin 13) is provided for external loop

compensation. The output voltage is offset by two diode

drops (≈ 1.4 V) and divided by three before it connects to the

inverting input of the Current Sense Comparator. This

guarantees that no drive pulses appear at the Output (Pin 3)

+

1.0 mA

Compensation

13

Error

R

FB

Amplifier

R

f

2R

C

2.5 V

f

14

R

Voltage

Feedback

Input

Current Sense

Comparator

1.0 V

Gnd

5

Foldback

Input

4

From Power Supply Output

R2

R1

when Pin 13 is at its lowest state (V ). The Error Amp

OL

minimum feedback resistance is limited by the amplifier’s

minimum source current (0.2 mA) and the required output

Current Sense Comparator and PWM Latch

The MC44603A can operate as a current mode controller

or as a voltage mode controller. In current mode operation,

the MC44603A uses the current sense comparator. The

output switch conduction is initiated by the oscillator and

terminated when the peak inductor current reaches the

voltage (V

OH

clamp level:

) to reach the current sense comparator’s 1.0 V

3.0 (1.0 V) 1.4 V

R

22 k

f(min)

0.2 mA

13

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

threshold level established by the Error Amplifier output (Pin

Figure 34. Oscillator

13). Thus, the error signal controls the peak inductor current

on a cycle–by–cycle basis. The Current Sense Comparator

PWM Latch ensures that only a single pulse appears at the

Source Output during the appropriate oscillator cycle.

The inductor current is converted to a voltage by inserting

V

ref

0.4 I

ref

C

VOS prot

V

OSC prot

1.0 V

1.6 V

V

the ground referenced sense resistor R in series with the

OSC

S

C

power switch Q1.

OSC Low

R

Q

C

< 1.6 V

T

This voltage is monitored by the Current Sense Input

(Pin 7) and compared to a level derived from the Error Amp

output. The peak inductor current under normal operating

conditions is controlled by the voltage at Pin 13 where:

L

S

OSC

Discharge

R Q

C

OSC High

Synchro

10

Disch

S

C

T

3.6 V

V

Demag

Out

C

OSC Regul

V

(Pin 13) – 1.4 V

3 R

I

pk

0

1

S

The Current Sense Comparator threshold is internally

clamped to 1.0 V. Therefore, the maximum peak switch

current is:

1

0

I

Regul

I

Discharge

1.0 V

I

pk(max)

R

S

Figure 35. Simplified Block Oscillator

Figure 33. Output Totem Pole

V

in

ref

V

C

14

I

C

UVLO

Charge

OSC Regul

0.4 I

V

ref

OSC prot

1.6 V

10

R2

Q1

V

Demag Out

3

0

1

0: Discharge Phase

1: Charge Phase

S

R

D

R3

Thermal

Protection

C

Q

1N5819

T

I

Discharge

I

PWM

Latch

Regul

Current

Sense

Substrate

R

Current Sense

Comparator

7

R

C

S

Two comparators are used to generate the sawtooth. They

compare the C voltage to the oscillator valley (1.6 V) and

T

peak reference (3.6 V) values. A latch (L

oscillator state.

) memorizes the

disch

Series gate resistor, R2, will dampen any high frequency oscillations caused by

the MOSFET input capacitance and any series wiring inductance in the

gate–source circuit. Diode D is required if the negative current into the output

drive pin exceeds 15 mA.

In addition to the charge and discharge cycles, a third

state can exist. This phase can be produced when, at the end

of the discharge phase, the oscillator has to wait for a

synchronization or demagnetization pulse before restarting.

Oscillator

The oscillator is a very accurate sawtooth generator that

can work either in free mode or in synchronization mode. In

this second mode, the oscillator stops in the low state and

waits for a demagnetization or a synchronization pulse to

start a new charging cycle.

During this delay, the C voltage must remain equal to the

oscillator valley value ( 1.6 V). So, a third regulated current

T

sourceI

controlledbyC ,isconnectedtoC in

Regul

OSCRegul T

order to perfectly compensate the (0.4 I ) current source

that permanently supplies C .

The maximum duty cycle is 80%. Indeed, the on–time is

allowed only during the oscillator capacitor charge.

ref

T

• The Sawtooth Generation:

In the steady state, the oscillator voltage varies between

about 1.6 V and 3.6 V.

Consequently:

The sawtooth is obtained by charging and discharging an

T

= C x ∆V/I

charge T charge

external capacitor C (Pin 10), using two distinct current

= C x ∆V/I

discharge

T

discharge

where:

T

sources = I

and I

. In fact, C is permanently

charge

discharge T

connected to the charging current source (0.4 I ) and so,

the discharge current source has to be higher than the

ref

T

is the oscillator charge time

charge

∆V is the oscillator peak–to–peak value

is the oscillator charge current

charge current to be able to decrease the C voltage (refer

T

I

charge

to Figure 35).

and

T

This condition is performed, its value being (2.0 I ) in

ref

in standby mode).

is the oscillator discharge time

is the oscillator discharge current

discharge

normal working and (0.4 I + 0.5 I

ref

F Stby

I

14

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

So, as f = 1 /(T

charge

+ T

) when the Regul

A diode D has been incorporated to clamp the positive

applied voltages while an active clamping system limits the

negative voltages to typically –0.33 V. This negative clamp

level is sufficient to avoid the substrate diode switching on.

In addition to the comparator, a latch system has been

incorporated in order to keep the demagnetization block

output level low as soon as a voltage lower than 65 mV is

detected and as long as a new restart is produced (high level

on the output) (refer to Figure 38). This process prevents

ringing on the signal at Pin 8 from disrupting the

demagnetization detection. This results in a very accurate

demagnetization detection.

S

discharge

arrangement is not activated, the operating frequency can be

obtained from the graph in Figure 1.

NOTE: The output is disabled by the signal V

when

OSC prot

V

is lower than 1.0 V (refer to Figure 30).

CT

Synchronization and Demagnetization Blocks

To enable the output, the L latch complementary

OSC

output must be low. Reset is activated by the L

during the discharge phase. To restart, the L

(refer to Figure 34). To perform this, the demagnetization

signal and the synchronization must be low.

output

disch

has to be set

OSC

The demagnetization block output is also directly

connected to the output, disabling it during the

demagnetization phase (refer to Figure 33).

• Synchronization:

The synchronization block consists of two comparators

that compare the synchronization signal (external) to 0.7 and

3.7 V (typical values). The comparators’ outputs are

connected to the input of an AND gate so that the final output

of the block should be :

NOTE: The demagnetization detection can be inhibited by

connecting Pin 8 to the ground.

Figure 38. Demagnetization Block

– high when 0.7 < SYNC < 3.7 V

– low in the other cases.

Oscillator

Output

R

Q

Buffer

As a low level is necessary to enable the output,

synchronized low level pulses have to be generated on the

output of the synchronization block. If synchronization is not

required, the Pin 9 must be connected to the ground.

Demag

S

V

CC

Negative Active

Clamping System

Figure 36. Synchronization

V

Demag Out

3.7 V

8

C Dem

65 mV

Oscillator

Sync

9

D

Standby

Output Buffer

0.7 V

• Power Losses in a Classical Flyback Structure

Figure 39. Power Losses in a Classical

Flyback Structure

• Demagnetization:

In flyback applications, a good means to detect magnetic

saturation of the transformer core, or demagnetization,

consists in using the auxiliary winding voltage. This voltage is:

Clamping

Network

V

in

R

ICL

– negative during the on–time,

– positive during the off–time,

+

AC Line

– equal to zero for the dead–time with generally some

– ringing (refer to Figure 37).

R

startup

That is why, the MC44603A demagnetization detection

consists of a comparator that can compare the auxiliary

winding voltage to a reference that is typically equal to

65 mV.

V

CC

MC44603A

R

S

Figure 37. Demagnetization Detection

Snubber

In a classical flyback (as depicted in Figure 39), the

standby losses mainly consist of the energy waste due to:

0.75 V

Zero Current

Detection

V

Pin 8

– the startup resistor R

startup

P

startup

– the consumption of the IC and

– the power switch control

P

control

65 mV

– the inrush current limitation resistor R

P

ICL

– the switching losses in the power switch

– the snubber and clamping network

P

SW

–0.33 V

P

SN–CLN

P

is nearly constant and is equal to:

startup

On–Time

Off–Time

Dead–Time

2

R

startup

(V –V

in CC

)

15

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

P

only depends on the current drawn from the mains.

The V

threshold level is typically equal to

ICL

CS

)/3] and if the corresponding power threshold is

Losses can be considered constant. This waste of energy

decreases when the standby losses are reduced.

[(V

R P Stby

labelled P

P

:

thL

P

increases when the oscillator frequency is

V

control

2

R P Stby

3.0 R

S

0.5 x L x

x f

S

thL

increased (each switching requires some energy to turn on

the power switch).

And as:

P

and P are proportional to the switching

SW

frequency.

SN–CLN

V

R

x 0.4 x I

x 0.4 x

ref

R P Stby

P Stby

Consequently, standby losses can be minimized by

decreasing the switching frequency as much as possible.

The MC44603A was designed to operate at a standby

frequency lower than the normal working one.

V

ref

R

R P Stby

R

• Standby Power Calculations with MC44603A

During a switching period, the energy drawn by the

transformer during the on–time to be transferred to the output

during the off–time, is equal to:

10.6 x R x R

P

S

ref

thL

L x f

R

x

P Stby

V

ref

Thus, when the power drawn by the converter decreases,

decreases and when V becomes lower than [V

S

V

CS

x (V

1

2

CS

CS–th

2

E

x L x I

pk

)/3], the standby mode is activated. This results in

R P Stby

an oscillator discharge current reduction in order to increase

the oscillator period and to diminish the switching frequency.

As it is represented in Figure 40, the (0.8 x I ) current

where:

– L is the transformer primary inductor,

– l is the inductor peak current.

pk

ref

source is disconnected and is replaced by a lower value one

(0.25 x I

).

F Stby

Input power is labelled P :

in

2

0.5 x L x I x f

pk

S

P

Where: I

= V /R

ref F Stby

in

F Stby

where f is the normal working switching frequency.

S

In order to prevent undesired mode switching when power

is close to the threshold value, a hysteresis that is

Also,

proportional to V

is incorporated creating a second

R P Stby

thresholdlevelthatisequalto[2.5x(V

V

R

CS

I

pk

V

)/3].When

CS

RPStby

S

the standby comparator output is high, a second current

where R is the resistor used to measure the power switch

S

source (0.6 x I ) is connected to Pin 12.

ref

current.

Finally, the standby mode function can be shown

graphically in Figure 41.

2

Thus, the input power is proportional to V

(V

being

CS

the internal current sense comparator input).

That is why the standby detection is performed by creating

a V threshold. An internal current source (0.4 x I ) sets

the threshold level by connecting a resistor to Pin 12.

As depicted in Figure 40, the standby comparator

Figure 41. Dynamic Mode Change

CS

ref

P

in

f

S

noninverting input voltage is typically equal to (3.0 x V

+ V )

CS

F

while the inverter input value is (V

+ V ).

R P Stby

F

Figure 40. Standby

Normal

Working

Oscillator

Discharge

Current

V

ref ref

f

Stby

V

ref ref

0.6 I

1

P

thH

ref

0.4 I

0.8 I

ref

V

0.25

I

ref

F Stby

R

0.2 I

P Stby

ref

0

Standby

P

thL

V

CS

12

1

0

C

Stby

[(V

R P Stby

)/3]

2.5 x [(V )/3]

R P Stby

1

13

I

Discharge

Discharge/2

This curve shows that there are two power threshold

levels:

ER

AmpOut

2R

1R

C. S. Comparator

Current Mirror X2

– the low one:

– the high one:

P

fixed by V

2

thL

R P Stby

f

Stby

P

(2.5) x P

x

f

thH

thL

f

S

Stby

P

6.25 x P

x

thH

thL

f

S

16

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

Figure 45. Foldback Characteristic

Maximum Duty Cycle and Soft–Start Control

Maximum duty cycle can be limited to values less than

80% by utilizing the D and soft–start control. As depicted

in Figure 42, the Pin 11 voltage is compared to the oscillator

sawtooth.

I

V

pk max

out

max

V

O

Nominal

Figure 42. D

and Soft–Start

max

New Startup

Sequence Initiated

V

ref

Output

Control

0.4 I

ref

V

CC

disable2

V

I

11

out

Output

Drive

C

D

Dmax

max

Overload

D

2.4 V

Z

V

OSC

NOTE: Foldback is disabled by connecting Pin 5 to V

.

CC

Soft–Start

Capacitor

Oscillator

Overvoltage Protection

The overvoltage arrangement consists of a comparator

that compares the Pin 6 voltage to V

Figure 46).

(2.5 V) (refer to

ref

Figure 43. Maximum Duty Cycle Control

If no external component is connected to Pin 6, the

comparator noninverting input voltage is nearly equal to:

Pin 11

Voltage

V

CT

(Pin 10)

2.0 k

11.6 k

x V

CC

2.0 k

D

max

The comparator output is high when:

2.0 k

11.6 k

Using the internal current source (0.4 I ), the Pin 11

ref

x V

2.5 V

CC

2.0 k

voltage can easily be set by connecting a resistor to this pin.

If a capacitor is connected to Pin 11, the voltage increases

from 0 to its maximum value progressively (refer to Figure

44), thereby, implementing a soft–start. The soft–start

V

17 V

CC

A delay latch (2.0 µs) is incorporated in order to sense

overvoltages that last at least 2.0 µs.

If this condition is achieved, V , the delay latch

output, becomes high. As this level is brought back to the

input through an OR gate, V remains high (disabling

capacitor is discharged internally when the V

voltage drops below 9.0 V.

(Pin 1)

CC

OVP out

Figure 44. Different Possible Uses of Pin 11

the IC output) until V is disabled.

ref

Consequently, when an overvoltage longer than 2.0 µs is

Pin 11

RI

R Connected to Pin 11

I = 0.4 I

C

C // R

detected, the output is disabled until V

then re–applied.

is connected after V has reached steady state

in order to limit the circuit startup consumption.

is removed and

CC

V

RI

V

Z

ref

Z

The V

CC

ref

τ

= RC

The overvoltage section is enabled 5.0 µs after the

regulator has started to allow the reference V to stabilize.

ref

If no external component is connected to Pin 11, an

internal zener diode clamps the Pin 11 voltage to a value V

that is higher than the oscillator peak value, disabling

soft–start and maximum duty cycle limitation.

By connecting an external resistor to Pin 6, the threshold

Z

V

level can be changed.

CC

Figure 46. Overvoltage Protection

Foldback

V

ref

V

As depicted in Figures 32 and 48, the foldback input (Pin

CC

5) can be used to reduce the maximum V

foldback protection. The foldback arrangement is a

programmable peak current limitation.

value, providing

CS

Out

Delay

In

5.0 µs

τ

T

If the output load is increased, the required converter peak

2.5 V

0

current becomes higher and V

increases until it reaches its

CS

Enable

11.6 k

maximum value (normally, V

= 1.0 V).

CS max

V

OVP

6

V

OVP out

Then, if the output load keeps on increasing, the system is

unable to supply enough energy to maintain the output

voltages in regulation. Consequently, the decreasing output

can be applied to Pin 5, in order to limit the maximum peak

current. In this way, the well known foldback characteristic

can be obtained (refer to Figure 45).

τ

In

Out

C

External

Resistor

OVLO

2.0 k

Delay

2.0 µs

2.5 V

(If V

= 1.0,

OVP out

(V

)

ref

the Output is Disabled)

17

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

As depicted in Figure 47, an undervoltage lockout has

been incorporated to garantee that the IC is fully functional

before allowing system operation.

Undervoltage Lockout Section

Figure 47. V

Management

CC

This block particularly, produces V (Pin 16 voltage) and

ref

I

that is determined by the resistor R connected between

ref

Pin 16 and the ground:

R

ref

F Stby

V

R

ref

I

where V

2.5 V (typically)

ref

Pin 15

Pin 16

V

Another resistor is connected to the Reference Block:

ref enable

startup

1

R

that is used to fix the standby frequency.

F Stby

V

C

CC

In addition to this, V

is compared to a second threshold

). UVLO1 is

CC

level that is nearly equal to 9.0 V (V

1

disable1

generated to reset the maximum duty cycle and soft–start

block disabling the output stage as soon as V becomes

Reference Block:

Voltage and Current

Sources Generator

0

CC

. In this way, the circuit is reset and made

1

0

(V , I , ...)

lower than V

ref ref

disable1

V

Startup

14.5 V

ready for the next startup, before the reference block is

disabled (refer to Figure 29). Finally, the upper limit for the

minimum normal operating voltage is 9.4 V (maximum value

disable2

7.5 V

C

UVLO1

of V

) and so the minimum hysteresis is 4.2 V.

disable1

(to Soft–Start)

((V

)

= 13.6 V).

stup–th min

V

disable1

9.0 V

The large hysteresis and the low startup current of the

MC44603A make it ideally suited for off–line converter

applications where efficient bootstrap startup techniques are

required.

18

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

Figure 48. 250 W Input Power Off–Line Flyback Converter with MOSFET Switch

185 Vac

to

270 Vac

RFI

Filter

R1

1.0/5.0 W

C3

1.0 nF/1.0 kV

C4 ... C7

1.0 nF/1000 V

R3

4.7 M

D1 ... D4

1N4007

C1

220

µF

R20

22 k

L2

22.5

C32 220 pF

D8

5.0 W

µ

H

150 V/0.6 A

C31

C17

47 nF

D5

1N4934

R2

68 k/2.0 W

MR856

C30

C33

100

µF

µ

F

0.1 µF

C2

220

µF

Sync

D7

M856

L1

1.0 µH

C29 220 pF

C16

R12

30 V/2.0 A

C28

C8 2.2 nF

C9 1.0 nF

100 pF 27 k

9

8

D9

MR852

D6

1N4148

C27

1000

R9 1.0 k

0.1 µF

L

p

µF

aux

10

11

12

13

14

15

16

7

6

5

4

3

2

1

R5

1.2 k

C15

1.0 nF

C14

C10 1.0 µF

4.7 nF

C26 220 pF

R7 180 k

14 V/2.0 A

C24

R6

150

R8

15 k

R15

5.6 k

D10

MR852

C25

1000

C11

1.0 nF

µF

0.1 µF

C18

2.2 nF

D12

MR856

MTP6N60E

*D15 1N5819

R10 10

R15

22 k

R26

1.0 k

C23 220 pF

7.0 V/2.0 A

C22

R11 39

D11

MR852

R12 22

C21

1000

R14

0.2

R13

1.0 k

R17

22 k

µF

0.1 µF

R18

27 k

R19

10 k

C13

100 nF

R24

270

R23

147.5 k

MOC8101

R21

10 k

C19

100 nF

D14

1N4733

C20

33 nF

TL431

R25

1.0 k

C12

6.8 nF

R22

2.5 k

* Diode D15 is required if the negative current into the output pin exceeds 15 mA.

19

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

250 W Input Power Fly–Back Converter

185 V – 270 V Mains Range

MC44603AP & MTP6N60E

Tests

Conditions

Results

Line Regulation

V

= 185 Vac to 270 Vac

= 50 Hz

= 0.6 A

= 2.0 A

in

F

mains

150 V

130 V

114 V

7.0 V

I

10 mV

20 mV

out

Load Regulation

150 V

V

= 220 Vac

= 0.3 A to 0.6 A

in

I

50 mV

out

Cross Regulation

V

in

= 220 Vac

I

(150 V) = 0.6 A

(30 V) = 0 A to 2.0 A

(14 V) = 2.0 A

(7.0 V) = 2.0 A

out

150 V

< 1.0 mV

81%

Efficiency

V

= 220 Vac, P = 250 W

in

Standby Mode

P input

V

= 220 Vac, P

= 0 W

3.3 W

out

Switching Frequency

Output Short Circuit

Startup

20 kHz fully stable

Safe on all outputs

Vac = 160 V

P

= 270 W

out (max)

= 250 W

in

20

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

OUTLINE DIMENSIONS

P SUFFIX

PLASTIC PACKAGE

CASE 648–08

ISSUE R

NOTES:

–A–

1. DIMENSIONING AND TOLERANCING PER ANSI

Y14.5M, 1982.

2. CONTROLLING DIMENSION: INCH.

3. DIMENSION L TO CENTER OF LEADS WHEN

FORMED PARALLEL.

4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.

5. ROUNDED CORNERS OPTIONAL.

16

1

9

8

B

S

INCHES

MILLIMETERS

DIM

A

B

C

D

F

MIN

MAX

0.770

0.270

0.175

0.021

0.70

MIN

18.80

6.35

3.69

0.39

1.02

MAX

19.55

6.85

4.44

0.53

1.77

F

0.740

0.250

0.145

0.015

0.040

C

L

SEATING

PLANE

–T–

G

H

J

K

L

0.100 BSC

0.050 BSC

2.54 BSC

1.27 BSC

K

M

0.008

0.015

0.130

0.305

10

0.21

0.38

3.30

7.74

10

H

J

0.110

0.295

0

2.80

7.50

0

G

D 16 PL

0.25 (0.010)

M

S

0.020

0.040

0.51

1.01

M

T

A

21

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

OUTLINE DIMENSIONS

DW SUFFIX

PLASTIC PACKAGE

CASE 751G–02

(SOP–16L)

ISSUE A

–A–

NOTES:

1. DIMENSIONING AND TOLERANCING PER ANSI

Y14.5M, 1982.

16

9

2. CONTROLLING DIMENSION: MILLIMETER.

3. DIMENSIONS A AND B DO NOT INCLUDE MOLD

PROTRUSION.

4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER

SIDE.

5. DIMENSION D DOES NOT INCLUDE DAMBAR

PROTRUSION. ALLOWABLE DAMBAR

PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN

EXCESS OF D DIMENSION AT MAXIMUM

MATERIAL CONDITION.

–B–

8X P

0.010 (0.25)

M

B

1

8

J

16X D

MILLIMETERS

INCHES

M

S

0.010 (0.25)

T

A

B

DIM

A

B

C

D

MIN

10.15

7.40

2.35

0.35

0.50

MAX

10.45

7.60

2.65

0.49

0.90

MIN

MAX

0.411

0.299

0.104

0.019

0.035

0.400

0.292

0.093

0.014

0.020

F

R X 45

F

G

J

K

M

P

R

1.27 BSC

0.050 BSC

0.25

0.10

0

0.32

0.25

7

0.010

0.004

0

0.012

0.009

7

C

–T–

M

10.05

0.25

10.55

0.75

0.395

0.010

0.415

0.029

SEATING

14X G

K

PLANE

22

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding

the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and

specificallydisclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola

datasheetsand/orspecificationscananddovaryindifferentapplicationsandactualperformancemayvaryovertime. Alloperatingparameters,including“Typicals”

must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of

others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other

applicationsintended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury

ordeathmayoccur. ShouldBuyerpurchaseoruseMotorolaproductsforanysuchunintendedorunauthorizedapplication,BuyershallindemnifyandholdMotorola

and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees

arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that

Motorola was negligent regarding the design or manufacture of the part. Motorola and

Opportunity/Affirmative Action Employer.

are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal

23

MOTOROLA ANALOG IC DEVICE DATA

MC44603A

Mfax is a trademark of Motorola, Inc.

JAPAN: Motorola Japan Ltd.; SPD, Strategic Planning Office, 141,

How to reach us:

USA/EUROPE/Locations Not Listed: Motorola Literature Distribution;

P.O. Box 5405, Denver, Colorado 80217. 1–303–675–2140 or 1–800–441–2447 4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan. 81–3–5487–8488

Customer Focus Center: 1–800–521–6274

Mfax : RMFAX0@email.sps.mot.com – TOUCHTONE 1–602–244–6609

ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Centre,

Motorola Fax Back System

– US & Canada ONLY 1–800–774–1848 2, Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong.

– http://sps.motorola.com/mfax/

852–26629298

HOME PAGE: http://motorola.com/sps/

MC44603A/D

◊

24

MOTOROLA ANALOG IC DEVICE DATA


型号：	MC44603AP
厂家：	ONSEMI
描述：	MIXED FREQUENCY MODE GREENLINE PWM CONTROLLER 混合频率GREENLINE模式PWM控制器开关光电二极管控制器
文件：	总24页 (文件大小：409K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MC44603AP [ONSEMI]

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