UC1843A Series

PWM Controller flyback or forward - Low start-up current (0.5mA max.) 500KHz op

Catalog

PWM Controller flyback or forward - Low start-up current (0.5mA max.) 500KHz op

Part	Number of Outputs	Supplier Device Package	Control Features	Output Phases	Function	Topology	Mounting Type	Clock Sync	Duty Cycle (Max) [Max]	Synchronous Rectifier	Operating Temperature [Max]	Operating Temperature [Min]	Output Configuration	Output Type	Package / Case	Package / Case	Package / Case	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]
Microchip Technology UC1843AY	1	8-CERDIP	Frequency Control	1	Step-Down, Step-Up	Boost, Buck, Flyback, Forward	Through Hole		96 %		125 °C	-55 °C	Isolation Capable, Positive	Transistor Driver	7.62 mm	0.3 in	8-CDIP	7.6 V	30 V

Catalog

PWM Controller flyback or forward - Low start-up current (0.5mA max.) 500KHz op

Key Features

• * Optimized For Off-Line Control

• * Low Start-Up Current (<1mA)

• * Automatic Feed Forward Compensation

• * Trimmed Oscillator Discharge Current

• * Pulse-By-Pulse Current Limiting

• * Enhanced Load Response Characteristics -

• * Double-Pulse Suppression

• * High-Current Totem-Pole Output (1A Peak)

• * Internally Trimmed Band-gap Reference

• * 500kHz Operation Under-voltage Lockout: SG1843 - 8.4 volts

• * Low Shoot-Through Current <75mA Over Temperature

Description

Control ICs provides all the necessary features to implement off-line fixed-frequency, current-mode switching power supplies with a minimum of external components. The current mode architecture demonstrates improved load regulation, pulse-by- pulse current limiting and inherent protection of the power supply output switch