UC2843 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	Output Phases	Output Type	Function	Clock Sync	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Package / Case	Package / Case	Package / Case	Supplier Device Package	Duty Cycle (Max) [Max]	Output Configuration	Operating Temperature [Max]	Operating Temperature [Min]	Mounting Type	Number of Outputs	Synchronous Rectifier	Topology	Control Features
Microchip Technology UC2843AY	1	Transistor Driver	Step-Down, Step-Up		7.6 V	30 V	7.62 mm	0.3 in	8-CDIP	8-CERDIP	96 %	Isolation Capable, Positive	85 °C	-40 °C	Through Hole	1		Boost, Buck, Flyback, Forward	Frequency Control

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