Anachip AP3844
the AP3844 and AP3845 by the addition of an internal toggle flip flop which blanks the output off every other clock cycle. Optimized for Off-Line and DC to DC Converters Low Start-Up Current (≦0.5mA) Automatic Feed Forward Compensation Pulse-by-Pulse Current Limiting Enhanced Load Response Characteristics Under-Voltage Lockout (UVLO) with Hysteresis Double Pulse Suppression High Current Totem Pole Output Internally Trimmed Bandgap Reference Current Mode Operation to 500KHZ Low Ro Error Amplifier Pin Connections PDIP-8L, SOP-8L Top View COMP.| Part No. | AP3844 |
|---|---|
| Datasheet | AP3844 Download |
| Manufacturer |  Anachip |
| Description | High Performance Current Mode PWM Controller |
| Buy | Stock & Price |
FEATURES
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GENERAL DESCRIPTION
The AP3842/3/4/5 family of control ICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include under voltage lockout featuring start-up current less than 0.5 mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off-state. Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The AP3842 and AP3844 have UVLO thresholds of 16V(on) and 10V(off), ideally suited for off-line applications. The corresponding thresholds for the AP3843 and AP3845 are 8.5V and 7.6V. The AP3842 and AP3843 can operate to duty cycles approaching 100%.
