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AP3842 Datasheet(PDF) 4 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) 4 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
4/8
Notes:2.These parameters, although guaranteed, are not 100% tested in production.
3.Parameter measured at trip point of latch with VPIN2=0.
4.Gain defined as:
∆VPIN1
A=
∆VPIN3
; 0≦VPIN3≦0.8V
5.Adjust Vi above the start threshold before setting at 15V.
6.Output frequency equals oscillator frequency for the AP3842 and AP3843.
7.Output frequency is one and half oscillator frequency for the AP3844 and AP3845.
Figure 1 : Error Amp Configuration.
Zf
Zf
COMP
V
FB
2
1
2.5V
0.8 mA
Error amp can source or sink up to 0.5mA
Figure 2 : Under Voltage Lockout.
AP3842
AP3844
AP3843
AP3845
VON
VOFF
16V
10V
8.4V
7.6V
7
Vi
ON/OFF COMMAND
TO REST OF IC
ICC
VCC
VON
VOFF
<1 mA
<17 mA
During Under-Voltage Lockout, the output driver is biased to sink minor amounts of current. Pin 6 should be
shunted to ground with a bleeder resistor to prevent activating the power switch with extraneous leakage
currents.
Figure 3 : Current Sense Circuit.
3
1
5
R
2R
1V
CURRENT
SENSE
COMPARATOR
ERROR
AMP
COMP
CURRENT
SENSE
GND
C
R
Rs
IS


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