AMC3844B Overview
Description
The AMC3842B/43B/44B/45B are fixed frequency current-mode PWM controllers specially designed for OFF-Line switching power supply and DC-to-DC converters with a minimum number of external components. These devices feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and high current totem pole output which is suitable for driving MOSFETs.
Key Features
- thresholds for the AMC3842B/44B are 16V (on) and 10V (off), which are ideal for off-line applications
- The corresponding typical threshold for the AMC3843/45BB is 8.4V (on) and 7.6V (off)
- The AMC3842B/43B can operate within 100% duty cycle and the AMC3844B/45B can operate within 50% duty cycle
- APPLICATIONS - - - - - - - - - - - - - CURRENT MODE PWM CONTROLLER FEATURES Low Start-Up current (max
- 200µA) Optimized for Off-Line and DC-to-DC Converters Maximum Duty Cycle U.V.L.O
- Identical pin assignment to earlier UC384X series
- PACKAGE PIN OUT COMP VREF VCC OUTPUT GND Off-line flyback or forward converters
- DC-to-DC buck or boost converter
- Surface Mount (Top View) 8-Pin Plastic S.O.I.C
- Surface Mount (Top
