TPS92691EVM-752

LED 照明开发工具 TPS92691EVM-752

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* ** is a fully assembled and tested LED driver that can be configured as either a boost or a boost-to-battery topology to power a single string of series-connected LEDs. Accurate closed-loop LED current regulation is achieved using a low-offset rail-to-rail current-sense amplifier along with high-side current-sensing implementation. DC LED current set point can be varied over a 15:1 ratio using the high-impedance analog adjust IADJ input. An integrated gate driver circuit and proprietary PWM dimming logic are incorporated to enable external series P-channel MOSFET PWM dimming with greater than 100:1 dimming ratio.

LED short-circuit failure and other cable-harness fault detection is facilitated by a current monitor output IMON, which reports the instantaneous status of LED current measured by the rail-to-rail current-sense amplifier. The current-monitor output can be used in conjunction with microcontroller or discrete circuitry to implement a customized fault-protection scheme based on the lighting application and circuit topology.