UC3843BD1013TR Datasheet

PMIC - Voltage Regulators - DC DC Switching Controllers


The UC3843BD1013TR 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 offstate.Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC3842B and UC3843BD1013TR have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC3843BD1013TR and UC3845B are 8.5 V and 7.9 V. The UC3842B and UC3843BD1013TR can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC3844B and UC3845B by the addition of an internal toggle flip flop which blanks the output off every other clock cycle. UC3843BD1013TR Features &bull; TRIMMED OSCILLATOR FOR PRECISE FRE-&bull; QUENCY CONTROL OSCILLATOR FREQUENCY GUARANTEED&bull; AT 250kHz .CURRENT MODE OPERATION TO 500kHz AUTOMATIC FEED FORWARD COMPENSA. TION LATCHING PWM FOR CYCLE-BY-CYCLE&bull; CURRENT LIMITING INTERNALLY TRIMMED REFERENCE WITH&bull; UNDERVOLTAGE LOCKOUT .HIGH CURRENT TOTEM POLE OUTPUT UNDERVOLTAGE LOCKOUT WITH HYSTER. ESIS LOW START-UP AND OPERATING CURRENT


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