MC44608

http://onsemi.com

2

+

−

+

−

+

−

DMG

Demag

Logic

Output

Startup

Phase

Switching

Phase

Latched off

Phase

1 V

4 kHz Filter

Regulation

Block

Switching Phase

S2

S3

&

Latched off Phase

Standby

Thermal

DMG

OUT Disable

OVP

UVLO1

Switching Phase

Startup Phase

Latched off Phase

UVLO2

9 mA

Startup

CC

Buffer

PWM

Q

R

S

&

&

PWM

VPWM

&

OSC

OSC

Clock

Standby

Leading Edge

S1

10

&

Standby

18

6

5

4

3

2

Demag

Vi

Isense

Control

GND

Driver

V

Input

CC

Shutdown

Latch

UVLO2

Management

V

&

Source

Management

Enable

Blanking

Output

CS

2 S

m

>120 A

m

>24 A

m

50 mV

/20 mV

NOC

OC

200 A

m

Startup

Phase

Figure 1. Representative Block Diagram

ORDERING INFORMATION

Device

Switching Frequency

Package

Shipping

MC44608P40

40 kHz

PDIP−8

50 Units / Rail

MC44608P40G

PDIP−8

(Pb−Free)

50 Units / Rail

MC44608P75

75 kHz

PDIP−8

50 Units / Rail

MC44608P75G

PDIP−8

(Pb−Free)

50 Units / Rail

MAXIMUM RATINGS

Rating

Symbol

Value

Unit

Total Power Supply Current

30

mA

Output Supply Voltage with Respect to Ground

16

V

All Inputs except Vi

−1.0 to +16

V

Line Voltage Absolute Rating

500

V

Recommended Line Voltage Operating Condition

400

V

Power Dissipation and Thermal Characteristics

600

mW

Thermal Resistance, Junction−to−Air

100

°C/W

Operating Junction Temperature

150

°C

Operating Ambient Temperature

−25 to +85

°C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.