KA3842A Fairchild Semiconductor, KA3842A Datasheet

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KA3842A

Manufacturer Part Number
KA3842A
Description
The KA3842AC/KA3842AE are fixed PWM controller for Off Line and DC to DC converter applications
Manufacturer
Fairchild Semiconductor
Datasheet

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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
Internal Block Diagram
©2002 Fairchild Semiconductor Corporation
KA3882C/KA3883C
SMPS Controller
COMP
R
V
C.S
T
V
/C
REF
FB
T
8
2
1
3
4
Internal
Bias
1/2V
REF
Error Amp
+
-
OSCILLATOR
V
5V
REF
Good LOGIC
1/3
RESET
SET/
1V
C.S
Comp.
Description
The KA3882C/KA3883C is a fixed PWM controller for Off
Line and DC to DC converter applications. The internal
circuits include an UVLO, a low start up current circuit, a
temperature compensated reference, a high gain error
amplifier, a current sensing comparator, and the high current
totem-pole output for driving a POWER MOSFET. Also the
KA3882C/KA3883C provides low start-up current below
0.3mA and short shutdown delay time typ. 100ns. The
KA3882C has the UVLO threshold of 16V (on) and
10V(off). The KA3883C is 8.4V(on) and 7.6V(off). The
KA3882C and KA3883C can operate within 100% duty
cycle.
UVLO
PWM
LATCH
R
S
8-DIP
8-SOP
T
1
1
29V
22V
www.fairchildsemi.com
7
5
7
6
5
OUTPUT
GND
PWR
GND
V
PWR
V
CC
C
Rev. 1.0.1

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KA3842A Summary of contents

Page 1

... C ©2002 Fairchild Semiconductor Corporation Description The KA3882C/KA3883C is a fixed PWM controller for Off Line and converter applications. The internal circuits include an UVLO, a low start up current circuit, a temperature compensated reference, a high gain error amplifier, a current sensing comparator, and the high current totem-pole output for driving a POWER MOSFET. Also the KA3882C/KA3883C provides low start-up current below 0 ...

Page 2

KA3882C/KA3883C Absolute Maximum Ratings Parameter Supply Voltage Output Current Analog Inputs (pin 2, 3) Error Amp. Output Sink Current Power Dissipation Thermal Resistance, Junction-to-Air (Note4) 8-SOP 8-DIP Storage Temperature Electrical Characteristics (V = 15V 10k , C = ...

Page 3

Electrical Characteristics (V = 15V 10k , C = 3.3nF Parameter Symbol ERROR AMPLIFIER SECTION Input Voltage Input Bias Current Open Loop Gain Unity Gain Bandwidth PSRR Output Sink Current Output Source Current I ...

Page 4

KA3882C/KA3883C Mechanical Dimensions Package 6.40 0.20 0.252 0.008 # 7.62 0.300 4 8-DIP 5.08 MAX 0.200 3.40 0.33 0.20 MIN 0.013 0.134 0.008 3.30 0.30 0.130 0.012 ...

Page 5

Mechanical Dimensions Package #1 #4 6.00 0.236 3.95 0.156 0.225 0.50 0.20 0.020 0.008 (Continued) 8-SOP 1.55 0.20 0.061 0.008 #8 #5 0.30 1.80 MAX 0.012 0.071 0.20 0.008 5.72 KA3882C/KA3883C 0.1~0.25 MIN 0.004~0.001 5 ...

Page 6

... KA3883C KA3883CD DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. ...

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