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LM5575Q0MH/NOPB bảng dữ liệu(PDF) 9 Page - Texas Instruments |
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LM5575Q0MH/NOPB bảng dữ liệu(HTML) 9 Page - Texas Instruments |
9 / 33 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 LM5575 SHUTDOWN STANDBY 7V REGULATOR SYNC SYNC OSCILLATOR RAMP OUT PGND CLK CLK COMP ERROR AMP R3 21k C3 470p C11 330p R7 10 C9 10 C10 120 R6 1.65k R5 5.11k L1 47 2H C7 0.022 C8 0.47 D1 CMSH3-100 13 15 14 16 THERMAL SHUTDOWN UVLO UVLO CLK DIS VCC LEVEL SHIFT DRIVER 1.225V 1.225V 0.7V 0.7V R4 49.9k C5 0.01 C6 open R2 OPEN C12 OPEN C4 0.01 C2 1.0 C1 1.0 R1 OPEN 7V ± 75V VIN VIN 2.1V PWM C_LIMIT 10 2A 5 2A VIN TRACK SAMPLE and HOLD 1V/A RAMP GENERATOR Ir = (10 2A x (VIN ± VOUT)) + 50 2A LM5575-Q1 www.ti.com SNOSB23C – OCTOBER 2008 – REVISED DECEMBER 2014 8 Detailed Description 8.1 Overview The LM5575-Q1 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 75-V N-Channel buck switch with an output current capability of 1.5 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 50 kHz to 500 kHz. An oscillator synchronization pin allows multiple LM5575-Q1 regulators to self-synchronize or be synchronized to an external clock. The output voltage can be set as low as 1.225 V. Fault protection features include, current limiting, thermal shutdown and remote shutdown capability. The device is available in the TSSOP-16 package featuring an exposed pad to aid thermal dissipation. 8.2 Functional Block Diagram Figure 8. Typical Application Circuit and Block Diagram The functional block diagram and typical application of the LM5575-Q1 are shown in Figure 8. The LM5575-Q1 can be applied in numerous applications to efficiently step-down a high, unregulated input voltage. The device is well suited for telecom, industrial and automotive power bus voltage ranges. 8.3 Feature Description 8.3.1 Shutdown and Standby The LM5575-Q1 contains a dual-level Shutdown (SD) circuit. When the SD pin voltage is below 0.7 V, the regulator is in a low-current shutdown mode. When the SD pin voltage is greater than 0.7 V but less than 1.225 V, the regulator is in standby mode. In standby mode, the VCC regulator is active but the output switch is disabled. When the SD pin voltage exceeds 1.225 V, the output switch is enabled and normal operation begins. An internal 5-µA pullup current source configures the regulator to be fully operational if the SD pin is left open. Copyright © 2008–2014, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM5575-Q1 |
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