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AS2208N Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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1 / 6 page ASTEC Semiconductor Description The AS2208 is a simplified pulse width modulation control- ler, offering similar functionality as that of the AS3842. Based on the AS2214, the AS2208 provides the additional features of low startup current and overvoltage latching, making it a good solution for adapter applications. The PWM function is controlled by the current sense com- parator for normal current mode control. The COMP pin, which serves as an input to the current sense comparator, provides a 1 mA current source which can be tied directly to the control loop optocoupler. The output stage is a high current totem pole output that sees only 85 ns delay from the PWM comparator. The AS2208 requires only 100 µA of startup current. The undervoltage lockout (UVLO) thresholds are nominally 14V for turn on and 8 V for turn off. The VREG pin, based on a trimmed bandgap reference, provides a temperature com- pensated 5 V to loads of up to 50 mA. The oscillator discharge current is trimmed to provide guaranteed duty cycle clamping. AS2208 Primary Side PWM Controller Preliminary Specification Features • Low Startup Current • Single-start or auto-restart modes • Oscillator trimmed for precision duty cycle clamp • Standard temperature range extended to 105 °C • Remote on / off control • Self limiting supply Voltage • Standard current mode control Pin Configuration — Top view Ordering Information Package Temperature Range Order Code 8-Pin Plastic DIP 0 to 105 ° C AS2208N 8-Pin Plastic SOIC 0 to 105 ° C AS2208D 77 8 1 7 2 GND 6 3 OV VREG 5 4 RT/CT OUT COMP VCC ISNS 8L SOIC (D) PDIP (N) 8 1 7 2 GND 6 3 OV VREG 5 4 RT/CT OUT VCC ISNS COMP |
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