UC3845A datasheet(9/16 Pages) STMICROELECTRONICS

Part #	UC3845A

Description	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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UC384XA - UC284XA

Figure 21. Isolated MOSFET Drive and Current Transformer Sensing.

Figure 22. Latched Shutdown.

7

6

COMP/LATCH

ISOLATION

BOUNDARY

D95IN349

5.0Vref

VCC

+

-

+

-

Q

S

R

3

R

RS

NS

C

Vin

Q1

NP

VGS Waveforms

+

0

+

0

-

50% DC

25% DC

Ipk =

V(pin 1) -1.4

3RS

NS

NP

()

D95IN350

BIAS

+

-

EA

R

+

OSC

2N

3905

2N

3903

1mA

R

2R

1

2

8

4

SCR must be selected for a holding current of less than 0.5mA at TA(min).

The simple two transistor circuit can be used in place of the SCR as shown. All resistors are 10K.

5

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