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UC1843J bảng dữ liệu(PDF) 1 Page - Texas Instruments |
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UC1843J bảng dữ liệu(HTML) 1 Page - Texas Instruments |
1 / 28 page www.ti.com FEATURES DESCRIPTION BLOCK DIAGRAM 11 A/B Vcc 7 12 5 9 GROUND 4 7 RT/CT 2 3 VFB 1 1 COMP 3 5 CURRENT SENSE 34 V 2.50 V OSC UVLO S/R 5 V REF VREF Good Logic Internal BIAS Error Amp 2R R 1 V CURRENT SENSE COMPARATOR PWM LATCH S R T 8 14 VREF 5 V 50 mA 7 VC 10 6 OUTPUT 8 5 POWER GROUND Note 1: Note 2: A = DIL−8 Pin Number. B = SO−14 and CFP−14 Pin Number. Toggle flip flop used only in 1844 and 1845. UC1842/3/4/5 UC2842/3/4/5 UC3842/3/4/5 SLUS223C – APRIL 1997 – REVISED JUNE 2007 CURRENT MODE PWM CONTROLLER • Optimized For Off-line and DC-to-DC The UC1842/3/4/5 family of control devices provides Converters the necessary features to implement off-line or dc-to-dc fixed frequency current mode control • Low Start-Up Current (<1 mA) schemes with a minimal external parts count. • Automatic Feed Forward Compensation Internally implemented circuits include under-voltage • Pulse-by-Pulse Current Limiting lockout featuring start up current less than 1 mA, a precision reference trimmed for accuracy at the error • Enhanced Load Response Characteristics amp input, logic to insure latched operation, a PWM • Under-Voltage Lockout With Hysteresis comparator which also provides current limit control, • Double Pulse Suppression and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for • High Current Totem Pole Output driving N-Channel MOSFETs, is low in the off state. • Internally Trimmed Bandgap Reference Differences between members of this family are the • 500-kHz Operation under-voltage lockout thresholds and maximum duty • Low R O Error Amp 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. 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. Copyright © 1997–2007, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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