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LM25088 Arkusz danych(PDF) 10 Page - Texas Instruments |
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LM25088 Arkusz danych(HTML) 10 Page - Texas Instruments |
10 / 39 page FB VIN VCC SW RT Regulator DRIVER BOOT LEVEL SHIFT THERMAL SHUTDOWN UVLO ERROR AMP DIS COMP TRACK SAMPLE and HOLD CLK GND CLK CSG CS CLK RAMP GENERATOR + SHUTDOWN PWM I- LIMIT OUT RAMP SS VIN STANDBY 5 uA 1.2 VIN EN Ir HG CLK S R Q Q CLK FREQUENCY DITHERING STANDBY SYNC DITHER LM5088 -1 ONLY OSCILLATOR HICCUP RESTART LOGIC Rs RFB1 DITHER RES RFB2 Q L D VOUT CBOOT UVLO MINIMUM OFF- TIME LOGIC 7.7V HICCUP RESTART LM5088 - 2 ONLY 5V A = -10 CRES/DITH CSYNC 1.2V RUV2 RUV1 CFT CIN CSS CHF RCOMP CCOMP RRT CRAMP COUT 0.9V 0.4V 5V 11 uA CVCC LM25088 VIN (4.5V-42V) 1.205V LM25088, LM25088-Q1 SNVS609J – DECEMBER 2008 – REVISED JANUARY 2015 www.ti.com 8 Detailed Description 8.1 Overview The LM25088 Wide Input Range Buck Controller features all the functions necessary to implement an efficient high voltage step-down converter using a minimum number of external components. The control method is based on peak current mode control utilizing an emulated current ramp. Peak current mode control provides inherent line voltage 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 very small duty cycles necessary in high input voltage applications. The operating frequency is user programmable from 50 kHz to 1 MHz. The LM25088-1 provides a ±5% frequency dithering function to reduce the conducted and radiated EMI, while the LM25088-2 provides a versatile restart timer for overload protection. Additional features include the low dropout bias regulator, tri-level enable input to control shutdown and standby modes, soft-start, and voltage tracking and oscillator synchronization capability. The device is available in a thermally enhanced HTSSOP-16 pin package. See Figure 13 and Figure 27. The LM25088 is well suited for a wide range of applications where efficient step- down of high, unregulated input voltage is required. The LM25088’s typical applications include Telecom, Industrial and Automotive. 8.2 Functional Block Diagram Figure 13. LM25088 Functional Block Diagram 10 Submit Documentation Feedback Copyright © 2008–2015, Texas Instruments Incorporated Product Folder Links: LM25088 LM25088-Q1 |
Podobny numer części - LM25088 |
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Podobny opis - LM25088 |
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