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Description

The HY3843 / HY3842D-N / HY3843D-N / HY3844D-N / HY3845D-N, are fixed frequency current mode PWM controller. Theyare speciallydesigned for OFF−Line and DC to DC converter applications with a minimal externalcomponents. Internallyimplemented circuits include a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totem pole output ideally  suited for driving a power MOSFET. Protection circuitry includes built under  voltage lockout and current limiting.

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Features 

• Low Start-Up and Operating Current

• High Current Totem Pole Output

• Under voltage Lockout With Hysteresis

• Operating Frequency Up To 500KHz