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AP3842 Datasheet(PDF) 5 Page - Anachip Corp

Part No. AP3842
Description  High Performance Current Mode PWM Controller
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Maker  ANACHIP [Anachip Corp]
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AP3842 Datasheet(HTML) 5 Page - Anachip Corp

   
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High Performance Current Mode PWM Controller
AP3842/3/4/5
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Oct.11, 2004
5/8
Peak current(is) is determined by the formula
1.0V
IS max ≈
RS
A small RC filter may be required to suppress switch transients.
Figure 4.
5
4
8
R
T
C
T
V
REF
R
T/CT
GROUND
for R
T > 5KΩ f=
1.72
R
TCT
Figure 5 : Open Loop Test Circuit.
1
2
3
4
5
6
7
8
COMP.
VFB
VREF
ISENSE
RT/CT
OUTPUT
GROUND
Vi
AP3842
A
GROUND
OUTPUT
Vi
VREF
TW
1K
0.1
uF
0.1
uF
CT
5K
4.7K
4.7K
1K
100K
ISENSE
ADJUST
ERROR AMP.
ADJUST
RT
2N2222
High peak currents associated with capacitive loads necessitate careful grounding techniques. Timing and
bypass apacitors should be connected close to pin 5 in a single point ground. The transistor and 5 KΩ
potentiometer are used to sample the oscillator waveform and apply an adjustable ramp to pin 3.
Figure 6 : Shutdown Techniques.
3
B
1 COMP
SHUTDOWN
TO CURRENT
SENSE RESISTOR
VREF
ISENSE
1K
500K
330K
SHUTDOWN


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