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UC1843MKGD1 Fiches technique(PDF) 1 Page - Texas Instruments |
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UC1843MKGD1 Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 10 page 1 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 UC1843-HiRel www.ti.com .................................................................................................................................................. SLUS896A – AUGUST 2009 – REVISED AUGUST 2009 CURRENT MODE PWM CONTROLLER (KNOWN GOOD DIE) • –55°C to 125°C Known Good Die • Controlled Baseline The UC1843 family of control devices provides the necessary features to implement off-line or dc-to-dc • Optimized For Off-line and DC-to-DC fixed frequency current mode control schemes with a Converters minimal external parts count. Internally implemented • Low Start-Up Current (<1 mA) circuits include under-voltage lockout featuring start • Automatic Feed Forward Compensation up current less than 1 mA, a precision reference trimmed for accuracy at the error amp input, logic to • Pulse-by-Pulse Current Limiting insure latched operation, a PWM comparator which • Enhanced Load Response Characteristics also provides current limit control, and a totem pole • Under-Voltage Lockout With Hysteresis output stage designed to source or sink high peak current. The output stage, suitable for driving • Double Pulse Suppression N-Channel MOSFETs, is low in the off state. The • High Current Totem Pole Output under-voltage lockout threshold is 8.4 V and • Internally Trimmed Bandgap Reference maximum duty cycle range is around 100%. • 500-kHz Operation • Low R O Error Amp xxx ORDERING INFORMATION(1) TA PACKAGE(2) ORDERABLE PART NUMBER TOP-SIDE MARKING –55°C to 125°C KGD UC1843KGD1 NA (1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com. (2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging. 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 © 2009, 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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