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LM3842A Datasheet(PDF) 3 Page - HTC Korea TAEJIN Technology Co.

Part No. LM3842A
Description  CURRENT MODE PWM CONTROLLER
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Maker  HTC [HTC Korea TAEJIN Technology Co.]
Homepage  http://www.htckorea.co.kr
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LM3842A Datasheet(HTML) 3 Page - HTC Korea TAEJIN Technology Co.

   
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CURRENT MODE PWM CONTROLLER
LM3842A/3A/4A/5A
Fig.1 Open Loop Test Circuit
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 5KΩ potentiometer are used to sample the oscillator waveform and apply an
adjustable ramp to pin 3.
Fig.2 Under Voltage Lockout
LM3842A
LM3843A/5A
VON
16V
8.4V
VOFF
10V
7.6V
During Under-Voltage Lock-Out, the output driver is biased to a high impedance state.
Pin 6 should be shunted to ground with a bleeder resistor to prevent activating the power switch
with output leakage current.
Fig.3 Error Amp Configuration
HTC
3
1
2
3
4
8
7
6
5
COMP
VREF
VFB
VC
OUTPUT
GND
ISENSE
RT/CT
LM3842A
0.1
0.1
A
CT
OUTPUT
1K/1W
VREF
V1
RT
100K
2N
2222
4.7K
1K
5K
ISENSE
ADJUST
4.7K
E/A
ADJUST
Error amp can source or sink up to 0.5mA
2
1
-
+
Zi
Zf
COMP
VFB
0.5mA
2.5V
7
ON/OFF COMMAND
TO REST OF IC
< 15mA
< 1mA
VOFF VON
VCC
ICC


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