UC3842AN
SMPS Controller

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Datasheet

Size: 42.49KB
Page: 8
PDF: UC3842AN.pdf
  • Description:
    SMPS Controller
  • MFG:
    FAIRCHILD [Fairchild Semiconductor]
 

Abstract


?2000 Fairchild Semiconductor International
www.fairchildsemi.com
Rev. 5.0
Features
? Low Start Current 0.2mA (typ)
? Operating Range Up To 500KHz
? Cycle by Cycle Current Limiting
? Under Voltage Lock Out With Hysteresis
? Short Shutdown Delay Time: typ.100ns
? High Current Totem-pole Output
? Output Swing Limiting: 22V
Description
The UC3842A/UC3843A are fixed PWM controller for Off-
Line and DC to DC converter applications. The internal cir-
cuits include UVLO, low start up current circuit, tempera-
ture compensated reference, high gain error amplifier,
current sensing comparator, and high current totem-pole out-
put for driving a POWER MOSFET. Also UC3842A/
UC3843A provide low start up current below 0.3mA and
short shutdown delay time typ. 100ns. The UC3842A has
UVLO threshold of 16V(on) and 10V(off). The UC3843A is
8.4V(on) and 7.6V(off). The UC3842A and UC3843A can
operate within 100% duty cycle.
8-DIP
8-SOP
1
1
Internal Block Diagram
8
+
-
7
5
SET/
RESET
5V
VREF
Internal
Bias Good LOGIC
2
R
S
OSCILLATOR
1
3
4
T
7
6
5
UVLO
29V
22V
1/3
Error Amp
1/2VREF
1V
C.S
Comp.
PWM
LATCH
VREF
VFB
COMP
C.S
RT/CT
OUTPUT
VCC
GND
PWR
VC
PWR
GND
UC3842A/UC3843A
SMPS Controller

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