Anachip AP3845
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. The output stage, suitable for driving N-Channel MOSFETs, is low in the off-state. The AP3842 and AP3844 have UVLO thresholds of 16V(on) and 10V(off), ideally suited for off-line applications.| Part No. | AP3845 |
|---|---|
| Datasheet | AP3845 Download |
| Manufacturer |  Anachip |
| Description | High Performance Current Mode PWM Controller |
| Buy | Stock & Price |
FEATURES
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GENERAL DESCRIPTION
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. Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. 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%. A range of the zero to < 50% is obtained by 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 Characteris...
