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UC1844AMDREP Fiches technique(PDF) 1 Page - Texas Instruments |
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UC1844AMDREP Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 11 page UC1842A-EP, UC1843A-EP, UC1844A-EP, UC1845A-EP CURRENT-MODE PWM CONTROLLER SGLS134B – SEPTEMBER 2002 – REVISED APRIL 2003 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D Controlled Baseline – One Assembly/Test Site, One Fabrication Site D Extended Temperature Performance of –55 °C to 125°C D Enhanced Diminishing Manufacturing Sources (DMS) Support D Enhanced Product Change Notification D Qualification Pedigree† D Optimized for Off-line and DC to DC Converters D Low Start Up Current (<0.5 mA) D Trimmed Oscillator Discharge Current † Component qualification in accordance with JEDEC and industry standards to ensure reliable operation over an extended temperature range. This includes, but is not limited to, Highly Accelerated Stress Test (HAST) or biased 85/85, temperature cycle, autoclave or unbiased HAST, electromigration, bond intermetallic life, and mold compound life. Such qualification testing should not be viewed as justifying use of this component beyond specified performance and environmental limits. D Automatic Feed Forward Compensation D Pulse-by-Pulse Current Limiting D Enhanced Load Response Characteristics D Under-Voltage Lockout With Hysteresis D Double Pulse Suppression D High Current Totem Pole Output D Internally Trimmed Bandgap Reference D 500 kHz Operation D Low RO Error Amp description The UC1842A/3A/4A/5A family of control ICs is a pin for pin compatible improved version of the UC3842/3/4/5 family. Providing the necessary features to control current mode switched mode power supplies, this family has the following improved features. Start up current is guaranteed to be less than 0.5 mA. Oscillator discharge is trimmed to 8.3 mA. During under voltage lockout, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V. The difference between members of this family are shown in the table below. PART NUMBER UVLO ON UVLO OFF MAXIMUM DUTY CYCLE UC1842A 16 V 10 V <100% UC1843A 8.5 V 7.9 V <100% UC1844A 16 V 10 V <50% UC1845A 8.5 V 7.9 V <50% ORDERING INFORMATION‡ TA PACKAGE‡ ORDERABLE PART NUMBER TOP-SIDE MARKING –55 °C to 125°C SOP – D Tape and reel UC1842AMDREP 1842AME –55 °C to 125°C SOP – D Tape and reel UC1843AMDREP 1843AME –55 °C to 125°C SOP – D Tape and reel UC1844AMDREP 1844AME –55 °C to 125°C SOP – D Tape and reel UC1845AMDREP 1845AME ‡ Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. Copyright 2002 – 2003, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. 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. D PACKAGE (TOP VIEW) 1 2 3 4 8 7 6 5 COMP VFB ISENSE RT/CT VREF VCC OUTPUT GND |
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