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LM3000 Scheda tecnica(PDF) 11 Page - Texas Instruments |
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LM3000 Scheda tecnica(HTML) 11 Page - Texas Instruments |
11 / 41 page VIN 4 5.2V REGS VDD VDR 12 5 gm BIAS EN1 EN2 VBG 0.6V CLOCK/ PLL FREQ/ SYNC CLKOUT 18 23 17 28 VSW1 + - 20 éA + + + - + + + - 8.5 éA SS2 TRK2 TRK1 SS1 RAMP1 RAMP2 ILIM1 ILIM2 PGND2 PGND1 VSW2 IFREQ IVIN ISLOPE1 ISLOPE2 CURRENT EMULATION AND SLOPE COMPENSATION REF1 REF2 9 32 8 7 1 2 + - SYSTEM_CLOCK VSW1 VSW2 PWM LOGIC DUTY CYCLE AND DRIVER CONTROL EN1 EN2 SYSTEM_REF REF1 REF2 VOUT1, VOUT2 MONITOR EN1 EN2 SYSTEM_REF VCB1 HG1 LG1 VSW1 PGND1 COMP1 FB1 FB1 EA1_GND EA2_GND FB2 FB2 COMP2 PGOOD1 PGOOD2 VCB2 HG2 VDR LG2 20 19 22 21 30 11 10 31 6 15 14 13 16 3 25 26 27 24 VSW2 VDR ++ + + RDSON SENSING ASEN(s) EN1 or FAULT EN2 or FAULT 20 éA PGND2 OC1 OC2 RDSON SENSING ASEN(s) LG2 LG2 LG1 LG1 FAULT 8.5 éA 250Ö 250Ö SGND 29 1 kÖ 1 kÖ + - + - gmn FB2 FB1 gm gm REF2 REF1 LM3000 www.ti.com SNVS612A – JULY 2009 – REVISED JULY 2009 Block Diagram Functional Description THEORY OF OPERATION The LM3000 is a dual emulated current-mode PWM synchronous controller. Unlike traditional peak current-mode controllers which sense the current while the high-side FET is on, the LM3000 senses current while the low-side FET is on. It then emulates the peak current waveform and uses that information to regulate the output voltage. The blanking time when the high-side FET first turns on that is normally associated with high-side sensing is not needed, allowing high-side ON pulses as low as 50 ns. The LM3000 therefore has both excellent line transient response and the ability to regulate low output voltages from high input voltages. Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM3000 |
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