3843GP 参数 Datasheet PDF下载

Data Sheet

GREEN MODE PWM CONTROLLER

Electrical Characteristics (Continued)

V

REF

4.7k

R

T

2N2222

1

AP384XG

AP3842G

COMP

REF

8

A

V

CC

1k

ERROR AMP

ADJUST

4.7k

100k

2

FB

VCC

7

0.1µF

5k

I

SENSE

ADJUST

3

CS

R

T

/C

T

OUTPUT

GND

6

1K

1W

OUTPUT

0.1µF

4

5

C

T

GND

Figure 4. Basic Test Circuit

Figure 4 is the basic test circuit for AP384XG. In testing, the high peak currents associated with capacitive loads

necessitate careful grounding techniques. Timing and bypass capacitors should be connected close to pin 5 in a

single point ground. The transistor and 5k potentiometer are used to sample the oscillator waveform and apply an

adjustable ramp to pin 3.

Aug. 2005 Rev. 1. 2

BCD Semiconductor Manufacturing Limited

7