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LM25116 Datasheet(PDF) 11 Page - Texas Instruments |
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LM25116 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 36 page FB VIN VCC REGULATOR DRIVER HB ADAPTIVE TIMER EN UVLO UVLO ERROR AMP DIS COMP CLK S R Q Q OSCILLATOR AGND CLK CSG RAMP GENERATOR + SLEEP MODE SHUTDOWN PWM CURRENT LIMIT RAMP SS VIN 10 x RS V/A 5 PA 1V 10 PA CS DRIVER PGND LO VOUT HO SW 1 2 3 4 5 14 6 15 10 13 12 20 19 18 + - 4.5V 17 HICCUP FAULT TIMER 256 CLOCK CYCLES UVLO LOGIC STANDBY UVLO 7 8 9 16 VCCX RT A =10 VCC DEMB 11 TRACK SAMPLE and HOLD CLK DIODE EMULATION CONTROL SS SW THERMAL SHUTDOWN 3V VCCX EN SYNC 1.215 V CCOMP RCOMP CHF 1 0.5V RS CSNUB VOUT R SNUB COUT Q2 Q1 L1 RFB1 RFB2 IR D1 C VCC CVCCX VIN CHB RT/SYNC CRAMP CSYNC 1.215V 7. 4 V LM25116 REN RUV2 RUV1 CIN CFT CSS VIN D2 IR = 5 PA ( VIN - VOUT ) + 25 PA V x / .6V 6V - 42V LM25116 www.ti.com SNVS509D – APRIL 2007 – REVISED FEBRUARY 2013 BLOCK DIAGRAM AND TYPICAL APPLICATION CIRCUIT Figure 26. Typical Application Circuit DETAILED OPERATING DESCRIPTION The LM25116 high voltage switching regulator features all of the functions necessary to implement an efficient high voltage buck regulator using a minimum of external components. This easy to use regulator integrates high- side and low-side MOSFET drivers capable of supplying peak currents of 2 Amps. The regulator control method is based on current mode control utilizing an emulated current ramp. Emulated peak current mode control provides inherent line feed-forward, cycle by cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable processing of the very small duty cycles necessary in high input voltage applications. The operating frequency is user programmable from 50 kHz to 1 MHz. An oscillator/synchronization pin allows the operating frequency to be set by a single resistor or synchronized to an external clock. Fault protection features include current limiting, thermal shutdown and remote shutdown capability. An under-voltage lockout input allows regulator shutdown when the input voltage is below a user selected threshold, and an enable function will put the regulator into an extremely low current shutdown via the enable input. The HTSSOP-20 package features an exposed pad to aid in thermal dissipation. Copyright © 2007–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM25116 |
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