UC3845AN 参数 Datasheet PDF下载

UC384XA - UC284XA

Figure 21. Isolated MOSFET Drive and Current Transformer Sensing.

V

CC

V

in

7

5.0Vref

+

-

ISOLATION

BOUNDARY

V

GS

Waveforms

+

-

S

R

-

6

Q1

+

0

-

50% DC

+

0

-

25% DC

Q

I

pk

=

V

(pin 1)

-1.4

3R

S

(

N

)

N

S

P

Figure 22. Latched Shutdown.

+

COMP/LATCH

3

C

D95IN349

R

R

S

N

S

N

P

4

OSC

8

R

BIAS

R

+

1mA

+

2

-

EA

2R

R

1

5

2N

3905

2N

3903

D95IN350

SCR must be selected for a holding current of less than 0.5mA at T

A(min)

.

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

9/16