KA3844 Datasheet PDF - Unspecified

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●BEIJING ESTEK ELECTRONICS CO.,LTD

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●Description

●The 3842A(AM)/43A(AM)/44A(AM)/45A(AM ) are fixed frequency current mode PWM controller. They are specially designed for OFF− Line and DC to DC converter applications with a minimal external components. Internally implemented 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 totempole output ideally suited for driving a power MOSFET. Protection circuitry includes built undervoltage lockout and current limiting. The 3842A(AM) and 3844A(AM) have UVLO thresholds of 16 V (on) and 10 V (off). The corresponding thresholds for the 3843A(AM)/45A(AM) are 8.4V (on) and 7.6V (off) . The MIK3842A(AM) and MIK3843A(AM) can operate within 100% duty cycle. The 3844A(AM) and UC3845A(AM) can operate within 50% duty cycle. The 384XA(AM) has Start-Up Current 0.17mA (typ).

●Features

●• Low Start-Up and Operating Current

●• High Current Totem Pole Output

●• Undervoltage Lockout With Hysteresis

●• Operating Frequency Up To 300KHz (384XA)

●                                       500KHz (384XAM)