UC3842AN UC3842 Dip 8pin Tkpw1063 Original

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UC3842B UC3842 B Current Mode PWM SOP8 BH36

Description:

The UC284xB family of control ICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA, a precision 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.

Feature:

LOW START-UP AND OPERATING CURRENT

UNDERVOLTAGE LOCKOUT WITH HYSTERESIS

INTERNALLY TRIMMED REFERENCE WITH UNDERVOLTAGE LOCKOUT

CURRENT LIMITING

TRIMMED OSCILLATOR FOR PRECISE FREQUENCY CONTROL

CURRENT MODE OPERATION TO 500kHz

OSCILLATOR FREQUENCY GUARANTEED AT 250kHz

LATCHING PWM FOR CYCLE-BY-CYCLE

HIGH CURRENT TOTEM POLE OUTPUT

AUTOMATIC FEED FORWARD COMPENSATION

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