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LM5576 データシート(PDF) 8 Page - Texas Instruments |
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LM5576 データシート(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, 4 2 11 7 6 5 8 9 12 10 13, 14 1 SD Ir LM5576 SHUTDOWN STANDBY 7V REGULATOR SYNC SYNC OSCILLATOR RAMP OUT PGND CLK CLK COMP ERROR AMP R3 21k C3 330p C11 330p R7 10 C9 22 C10 150 R6 1.65k R5 5.11k L1 33 PH C7 0.022 C8 0.47 D1 CSHD6-100C 15, 16 19 17, 18 20 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 2.2 C1 2.2 R1 OPEN 7V ± 75V VIN VIN 2.1V PWM C_LIMIT 10 PA 5 PA VIN TRACK SAMPLE and HOLD 0.5V/A RAMP GENERATOR Ir = (5 PA x (VIN ± VOUT)) + 25 PA LM5576, LM5576-Q1 SNVS447I – JANUARY 2007 – REVISED APRIL 2013 www.ti.com Typical Application Circuit and Block Diagram Figure 9. Detailed Operating Description The LM5576 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 75V N-Channel buck switch with an output current capability of 3 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 500kHz. An oscillator synchronization pin allows multiple LM5576 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 HTSSOP-20 package featuring an exposed pad to aid thermal dissipation. The functional block diagram and typical application of the LM5576 are shown in Figure 9. The LM5576 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. High Voltage Start-Up Regulator The LM5576 contains a dual-mode internal high voltage startup regulator that provides the Vcc bias supply for the PWM controller and boot-strap MOSFET gate driver. The input pin (VIN) can be connected directly to the input voltage, as high as 75 Volts. For input voltages below 9V, a low dropout switch connects Vcc directly to Vin. In this supply range, Vcc is approximately equal to Vin. For Vin voltage greater than 9V, the low dropout switch is disabled and the Vcc regulator is enabled to maintain Vcc at approximately 7V. The wide operating range of 6V to 75V is achieved through the use of this dual mode regulator. The output of the Vcc regulator is current limited to 25mA. Upon power up, the regulator sources current into the capacitor connected to the VCC pin. When the voltage at the VCC pin exceeds the Vcc UVLO threshold of 5.35V and the SD pin is greater than 1.225V, the output switch is enabled and a soft-start sequence begins. The output switch remains enabled until Vcc falls below 5.0V or the SD pin falls below 1.125V. 8 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Product Folder Links: LM5576 LM5576-Q1 |
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同様の説明 - LM5576 |
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