ADDtek AMC3843B
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. The under voltage lock-out (U.V.L.O.) is designed to operated with 200µA start-up current in typical, allowing an efficient bootstrap supply voltage design.| Part No. | AMC3843B |
|---|---|
| Datasheet | AMC3843B Download |
| Manufacturer |  ADDtek |
| Description | CURRENT MODE PWM CONTROLLER |
| Buy | Stock & Price |
DESCRIPTION
The U.V.L.O. 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 CONTROLLERFEATURES
Low Start-Up current (max. 200µA) Optimized for Off-Line and DC-to-DC Converters Maximum Duty Cycle U.V.L.O. with Hysteresis Operating Frequency Up to 500KHz Internal Trimmed Bandgap Reference High Current Totem Pole Output Error Amplifier With Low Output Resistance Available in 8-Pin Plastic DIP and Surface Mount 14-Pin S.O.I.C. 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. Monitor Power Supply VFB ISENSE RT/CT 8-Pin Plastic DIP (Top View) AVAILABLE OPTIONS Device AMC3842B AMC3843B AMC3844B AMC3845B Start-UP Voltage 16V 8.4V 16V 8.4V Hysteresis 6V 0.8V 6V 0.8V Max.
