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UC3843P

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UC1842/3/4/5 UC2842/3/4/5 UC3842/3/4/5 www.ti.com SLUS223C – APRIL 1997 – REVISED JUNE 2007 CURRENT MODE PWM CONTROLLER FEATURES • • • • • • • • • • • DESCRIPTION Optimized For Off-line and DC-to-DC Converters Low Start-Up Current (<1 mA) Automatic Feed Forward Compensation Pulse-by-Pulse Current Limiting Enhanced Load Response Characteristics Under-Voltage Lockout With Hysteresis Double Pulse Suppression High Current Totem Pole Output Internally Trimmed Bandgap Reference 500-kHz Operation Low RO Error Amp The UC1842/3/4/5 family of control devices 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 under-voltage lockout featuring start up current less than 1 mA, 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. Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC1842 and UC1844 have UVLO thresholds of 16 VON and 10 VOFF, ideally suited to off-line applications. The corresponding thresholds for the UC1843 and UC1845 are 8.4 V and 7.6 V. The UC1842 and UC1843 can operate to duty cycles approaching 100%. A range of zero to 50% is obtained by the UC1844 and UC1845 by the addition of an internal toggle flip flop which blanks the output off every other clock cycle. BLOCK DIAGRAM Vcc 7 12 UVLO 34 V S/R GROUND 5 9 5V REF 8 14 VREF 5V 50 mA 2.50 V Internal BIAS VREF Good Logic 4 7 RT/CT OSC Error Amp VFB 2 COMP 1 CURRENT SENSE 3 7 11 VC 3 1 6 10 OUTPUT T S 2R R R 1V CURRENT SENSE COMPARATOR PWM LATCH 5 8 POWER GROUND 5 Note 1: A/B A = DIL−8 Pin Number. B = SO−14 and CFP−14 Pin Number. Note 2: Toggle flip flop used only in 1844 and 1845. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 1997–2007, Texas Instruments Incorporated

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