KA3882 Fairchild Semiconductor, KA3882 Datasheet

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KA3882

Manufacturer Part Number
KA3882
Description
Current mode PWM controller
Manufacturer
Fairchild Semiconductor
Datasheet

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KA3882/3/4/5
CURRENT MODE PWM CONTROLLER
The KA3882/3/4/5 are fixed PWM controller for Off-Line and DC
to DC converter applications. The internal circuits include UVLO,
low start up current circuit, temperature compensated reference,
high gain error amplifier, current sensing comparator, and high
current totempole output for driving a POWER MOSFET. Also KA
3882/3/4/5 provide low start up current below 0.3mA and short
shutdown delay time typ. 100ns.
The KA3882 and KA3884 have UVLO threshold of 1 6V(on) and
10V(off).
The KA3883 and KA3885 are 8.4V(on) and 7.6V(off).
The KA3882 and KA3883 can operate within 100% duty cycle.
The KA3884 and KA3885 within 50% by using T Flip-Flop.
FEATURES
BLOCK DIAGRAM
©1999 Fairchild Semiconductor Corporation
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 Totempole Output
Output Swing Limiting: 22V
ORDERING INFORMATION
KA388X
KA388XD
Device
Package
8 SOP
8 DIP
8 DIP
8 SOP
SMPS CONTROLLER
Operating Temperature
0 ~ + 85
0 ~ + 85
Î
Î
Rev. B

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KA3882 Summary of contents

Page 1

... POWER MOSFET. Also KA 3882/3/4/5 provide low start up current below 0.3mA and short shutdown delay time typ. 100ns. The KA3882 and KA3884 have UVLO threshold of 1 6V(on) and 10V(off). The KA3883 and KA3885 are 8.4V(on) and 7.6V(off). The KA3882 and KA3883 can operate within 100% duty cycle. ...

Page 2

... KA3882/3/4/5 ABSOLUTE MAXIMUM RATINGS Characteristic Supply Voltage Output Current Analog Inputs (pin 2, 3) Error Amp. Output Sink Current Power Dissipation ELECTRICAL CHARACTERISTICS ` Î 15V 10K , C = 3.3nF Characteristic Symbol REFERENCE SECTION Output Voltage V L Line Regulation L Load Regulation ...

Page 3

... SOURCE 200mA 12 SOURCE Î ï 1nF (NOTE 1) Î ï 1nF (NOTE 1) ï 27V 1nF OLIM CC KA3882 KA3883/5 7.8 KA3882 KA3883/5 7.0 Typ Max Unit 2.50 2. ï ï 1 MHz ï ï ï -0.8 mA ï 0.8 1.1 V ...

Page 4

... NOTE 1. These parameters, although guaranteed, are not 100% tested in production. 2. Parameter measured at trip point of latch with Gain defined as PIN1 PIN3 SMPS CONTROLLER Î , unless otherwise specified) Test Conditions Min KA3882/3 94 KA3884/5 47 ï ï ï ï ï PIN2 PIN3 ï I ...

Page 5

... TRADEMARKS The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended exhaustive list of all such trademarks. ACEx™ CoolFET™ CROSSVOLT™ CMOS FACT™ FACT Quiet Series™ ® FAST FASTr™ ...

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