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UC3842A/3843A
PIN CONFIGURATION
COMP 1
VFB 2
Current Sense 3
RT/CT 4
LINEAR INTEGRATED CIRCUIT
8 VREF
7 VCC
6 Output
5 GND
BLOCK DIAGRAM
VREF
8
Internal
Bias
VFB
2
COMP 1
CURRENT SENSE 3
RT/CT 4
1/2VREF
ERROR
AMPLIFIER
5V REF
S/R
VREF
Good
Logic
1/ 3VREF
U.V.L.O
CURRENT
SENSE
COMPARATOR
1V
R
PWM
LATCH
S
OSCILLATOR
7 Vcc
5 GND
7 Vcc
6 OUTPUT
5 GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 9
QW-R103-002,D