UC3842BN Datasheet

Current Mode PWM Controllers


The UC384X2B family of control ICs provides the nec-essary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally imple-mented circuits include a trimmed oscillator for pre-cise DUTY CYCLE CONTROL under voltage lock-out featuring start-up current less than 0.5mA, a pre-cision 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. The output stage, suitable for driving N-Channel MOSFETs, is low in the off-state. UC3842BN Features • Trimmed oscillator for precise fre-quency control• Oscillator frequency guaranteed at 250khz• Current mode operation to 500khz• Automatic feed forward compensa-tion• Latching pwm for cycle-by-cycle current limiting• Iinternally trimmed reference with undervoltage lockout• High current totem pole output• Undervoltage lockout with hyster-esis• Low start-up and operating current


[{"Name":"Switching Frequency","Value":"500 kHz"},{"Name":"Rise Time","Value":"50 ns"},{"Name":"Fall Time","Value":"50 ns"},{"Name":"Operating Supply Voltage","Value":"30 V"},{"Name":"Number of Outputs","Value":"1"},{"Name":"Maximum Operating Temperature","Value":"+ 150 C"},{"Name":"Mounting Style","Value":"Through Hole"},{"Name":"Package / Case","Value":"PDIP-8"},{"Name":"Minimum Operating Temperature","Value":"- 40 C"},{"Name":"Output Current","Value":"1000 mA"}]

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