TPS61061

具有亮度控制的 19V 400mA 开关 1MHz 升压转换器，用于白光 LED 电源

The TPS6106x is a high-frequency, synchronous boost converter with constant current output to drive up to 5 white LEDs. For maximum safety, the device features integrated overvoltage and an advanced short-circuit protection when the output is shorted to ground. The device operates with 1-MHz fixed switching frequency to allow for the use of small external components and to simplify possible EMI problems. The device comes with three different overvoltage protection thresholds 14 V/18 V/23 V to allow inexpensive and small-output capacitors with lower voltage ratings. The LED current is initially set with the external sense resistor Rs, and the feedback voltage is regulated to 500 mV or 250 mV, depending on the ILED pin configuration. Digital brightness control is implemented by applying a simple digital signal to the ILED pin. Alternatively, a PWM signal up to 1 kHz can be applied to the enable pin to control the LED brightness. During shutdown, the output is disconnected from the input to avoid leakage current through the LEDs.

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LED Driver With Integrated Overvoltage

and Short-Circuit Protection

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2.7-V to 6-V Input Voltage Range

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500-mV/250-mV Feedback Voltage

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TPS61060 Powers Up to 3 LEDs

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Powers Up to 4 LEDs

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TPS61062 Powers Up to 5 LEDs

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PWM Brightness Control on Enable

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Digital Brightness Control on ILED

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1-MHz Fixed Switching Frequency

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400-mA Internal Power MOSFET Switch

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LEDs Disconnected During Shutdown

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Operates With Small-Output Capacitors

Down to 220 nF

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Up to 80% Efficiency

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8-Pin NanoFree® Package Chipscale, CSP

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3 × 3-mm QFN Package