UNISONIC TECHNOLOGIES CO., LTD UC3842G
HIGH PERFORMANCE CURRENT MODE CONTROLLER
■ DESCRIPTION
LINEAR INTEGRATED CIRCUIT
The UTC UC3842G of high performance current mode controller is specifically designed for off-line and DC-to-DC converter applications offering the designer a cost effective solution with minimal external components. This integrated circuit features approximately 300μA start up current, a precision reference trimmed the error amplifier input. Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limiting, and so on.
■
FEATURES
Lead-free: UC3842GL Halogen-free: UC3842GP
* Low startup and operating current * User defined switching frequency(Norm is 52kHz) * Power-saving mode for low power * Under voltage lockout with hysteresis * Over voltage protection * Latching PWM for Cycle-By-Cycle current limiting * Internally trimmed reference with undervoltage lockout
ORDERING INFORMATION
Normal UC3842G-S08-R UC3842G-S08-T UC3842G-D08-T Ordering Number Lead Free UC3842GL-S08-R UC3842GL-S08-T UC3842GL-D08-T Halogen Free UC3842GP-S08-R UC3842GP-S08-T UC3842GP-D08-T Package SOP-8 SOP-8 DIP-8 Packing Tape Reel Tube Tube
www.unisonic.com.tw Copyright © 2008 Unisonic Technologies Co., Ltd
1 of 8 QW-R103-036.B
UC3842G
PIN CONFIGURATION
LINEAR INTEGRATED CIRCUIT
COMP 1
8 VREF
FB 2
7 VCC
CS 3
6 OUT
CT 4
5 GND
■
PIN DESCRIPTION
PIN NAME COMP FB CS CT GND OUT VCC VREF I/O O I I I O O Function This pin is error amplifier output The error amplifier inverting input Current sense input The capacitor controlling switch frequency Ground Output to the gate of external power MOS Supply voltage Inter 5V reference voltage output
PIN NO. 1 2 3 4 5 6 7 8
UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw
2 of 8 QW-R103-036.B
UC3842G
■ BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw
3 of 8 QW-R103-036.B
UC3842G
ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
LINEAR INTEGRATED CIRCUIT
PARAMETER SYMBOL RATINGS UNIT Supply Voltage (Low Impedance Source) VCC 30 V Supply Voltage (ICC
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