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LM3402HVMRX 数据表(PDF) 10 Page - Texas Instruments |
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LM3402HVMRX 数据表(HTML) 10 Page - Texas Instruments |
10 / 39 page tON = 1.34 x 10 -10 x RON VIN BOOT VCC VIN SW CS DIM RON GND VIN SENSE 7V BIAS REGULATOR BYPASS SWITCH VCC UVLO THERMAL SHUTDOWN ON TIMER RON Complete Start + - 300 ns MIN OFF TIMER Complete Start LOGIC + - + - + - CURRENT LIMIT OFF TIMER BUCK SWITCH CURRENT SENSE LEVEL SHIFT GATE DRIVE UVLO VIN + - 0.735A 0.7V 0.2V 0.3V 1.5V 5V 75 PA SD LM3402, LM3402HV SNVS450F – SEPTEMBER 2006 – REVISED OCTOBER 2015 www.ti.com 7 Detailed Description 7.1 Overview The LM3402 and LM3402HV are buck regulators with a wide input voltage range, low voltage reference, and a fast output enable/disable function. These features combine to make them ideal for use as a constant current source for LEDs with forward currents as high as 500 mA. The controlled ON-time (COT) architecture is a combination of hysteretic mode control and a one-shot ON-timer that varies inversely with input voltage. Hysteretic operation eliminates the need for small-signal control loop compensation. When the converter runs in continuous conduction mode (CCM) the controlled ON-time maintains a constant switching frequency over the range of input voltage. Fast transient response, PWM dimming, a low power shutdown mode, and simple output overvoltage protection round out the functions of the LM3402/HV. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Controlled ON-time Overview Figure 17 shows the feedback system used to control the current through an array of LEDs. A voltage signal, VSNS, is created as the LED current flows through the current setting resistor, RSNS, to ground. VSNS is fed back to the CS pin, where it is compared against a 200-mV reference, VREF. The ON-comparator turns on the power MOSFET when VSNS falls below VREF. The power MOSFET conducts for a controlled ON-time, tON, set by an external resistor, RON, and by the input voltage, VIN. ON-time is governed using Equation 1. (1) 10 Submit Documentation Feedback Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: LM3402 LM3402HV |
类似零件编号 - LM3402HVMRX |
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类似说明 - LM3402HVMRX |
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