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LM25574 数据表(PDF) 8 Page - Texas Instruments |
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LM25574 数据表(HTML) 8 Page - Texas Instruments |
8 / 30 page FB SW RT VIN BST SD 5V S R Q Q AGND IS CLK + SS PRE 3 2 10 6 5 4 7 8 11 9 12 1 SD Ir LM25574 SHUTDOWN STANDBY 7V REGULATOR SYNC SYNC OSCILLATOR RAMP OUT PGND CLK CLK COMP ERROR AMP R3 21k C3 470p C9 22 R6 1.65k R5 5.11k L1 100 PH C7 0.022 C8 0.47 D1 CMSH2-60M 13 15 14 16 THERMAL SHUTDOWN UVLO UVLO CLK DIS VCC LEVEL SHIFT DRIVER 1.225V 1.225V 0.7V 0.7V R4 24.9k C5 0.022 C6 open R2 OPEN C2 OPEN C4 0.01 C1 1.0 R1 OPEN 7V ± 42V VIN VIN 1.4V PWM C_LIMIT 10 PA 5 PA VIN TRACK SAMPLE and HOLD 2V/A RAMP GENERATOR Ir = (10 PA x (VIN ± VOUT)) + 50 PA 0.1 0.2 0.3 0.4 0.5 IOUT (A) 0 10 20 30 40 50 60 70 80 90 100 VIN = 7V VIN = 24V LM25574 SNVS483F – JANUARY 2007 – REVISED FEBRUARY 2009 www.ti.com Typical Performance Characteristics (continued) Demoboard Efficiency vs IOUT and VIN Typical Application Circuit and Block Diagram Detailed Operating Description The LM25574 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 a 42V N-Channel buck switch with an output current capability of 0.5 Amps. The regulator control method is based on 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 50kHz to 1MHz. An oscillator synchronization pin allows multiple LM25574 regulators to self synchronize or be synchronized to an external clock. The output voltage can be set as low as 1.225V. Fault protection features include, current limiting, thermal shutdown and remote shutdown capability. The device is available in the TSSOP-16 package. 8 Submit Documentation Feedback Copyright © 2007–2009, Texas Instruments Incorporated Product Folder Links: LM25574 |
类似零件编号 - LM25574 |
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类似说明 - LM25574 |
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