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5962-8670402VPA Datasheet(PDF) 1 Page - Texas Instruments |
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5962-8670402VPA Datasheet(HTML) 1 Page - Texas Instruments |
1 / 13 page 1 2 3 4 5 6 7 8 GROUND OUTPUT V CC V REF R /C T T I SENSE V FB COMP JG PACKAGE (TOP VIEW) 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: A = DIL−8 Pin Number. B = SO−14 and CFP−14 Pin Number . UC1843-SP www.ti.com SLUS981 – MARCH 2010 QML CLASS V, CURRENT-MODE PWM CONTROLLER Check for Samples: UC1843-SP 1 FEATURES • QML-V Qualified, SMD 5962-86704 • Rad-Tolerant: 50 kRad (Si) TID (ELDRS Free) (1) • Controlled Baseline • 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 xxx (1) Radiation tolerance is a typical value based upon initial device qualification with dose rate = 10 mrad/sec. Radiation Lot Acceptance Testing is available - contact factory for details. DESCRIPTION The UC1843 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. The under-voltage lockout threshold is 8.4 V and maximum duty cycle range is around 100%. BLOCK DIAGRAM 1 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 © 2010, 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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