Data Sheet
GREEN MODE PWM CONTROLLER
AP384XG
Electrical Characteristics (Continued)
VREF
RT
AP3842G
4.7k
2N2222
100k
A
VCC
1
2
3
4
8
7
6
5
REF
COMP
1k
VCC
FB
ERROR AMP
ADJUST
0.1µF
1K
1W
5k
ISENSE
ADJUST
CS
OUTPUT
GND
OUTPUT
GND
4.7k
RT/CT
0.1µF
CT
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.
BCD Semiconductor Manufacturing Limited
Aug. 2005 Rev. 1. 2
7
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
