HY3844
DESCRIPTION
The HY3842D-N/3843D-N/3844D-N/3845D-N, are fixed frequency current mode PWM controller. They are specially designed for OFF- Line and DC to DC converter applications with a minimal external ponents. Internally implemented circuits include a trimmed oscillator for precise duty cycle control, a temperature pensated reference, high gain error amplifier, current sensing parator, and a high current totem pole output ideally suited for driving a power MOSFET. Protection circuitry includes built under voltage lockout and current limiting. The HY3842D-N, HY3844D-N, have UVLO thresholds of 16 V (on) and 10 V (off). The corresponding thresholds for the HY3843D-N/3845D- N are 8.4V (on) and 7.6V (off). The HY 3842D-N, HY3843D-N, can operate within 100% duty cycle. The HY3844D-N, HY3845D-N, can operate w i thin 50% duty cycle. The HY384XD-N have Start-Up Current 0.17m A (typ).
PIN CONNECTION (TOP VIEW)
FEATURES
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- - Low Start-Up and Operating Current High Current Totem Pole Output...
