Description

The UC3844B and UC3845B series are high-performance fixed-frequency current mode controllers. They are specifically designed for Off??Line and DC-DC converter applications offering the designer a cost??effective solution with minimal external components. These integrated circuits feature an oscillator, a temperature-compensated reference, high-gain error amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET.

Features:

Trimmed Oscillator for Precise Frequency Control
Oscillator Frequency Guaranteed at 250 kHz
Current Mode Operation to 500 kHz Output Switching Frequency
Output dead adjustable from 50% to 70%
Automatic Feed Forward Compensation
Latching PWM for Cycle??By??Cycle Current Limiting
Internally Trimmed Reference with Undervoltage Lockout
High Current Totem Pole Output
Undervoltage Lockout with Hysteresis

Package Includes:
1 x UC3845BD1G ONSEMI Current Mode PWM, 25V-12V supply, 52 kHz, 13.4V/200mA out, SOIC-8