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TPS61061YZFT Datasheet(PDF) 11 Page - Texas Instruments |
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TPS61061YZFT Datasheet(HTML) 11 Page - Texas Instruments |
11 / 22 page www.ti.com td td tup td tdown toff Brightness Control Disabled Brightness Control Enabled Brightness Control Disabled High Low ILED EFFICIENCY AND FEEDBACK VOLTAGE UNDERVOLTAGE LOCKOUT THERMAL SHUTDOWN CHIPSCALE PACKAGE DIMENSIONS TPS61060 TPS61061 TPS61062 SLVS538 – NOVEMBER 2004 Between each cycle the ILED pin needs to be pulled high for 1.5 µs. Figure 15. ILED Timing Diagram Using the digital interface on the ILED pin allows simple implementation of a two-step brightness control by pulling the ILED either high or low. For full LED current with VFB = 500 mV, the ILED needs to be pulled low and to program half the LED current with VFB = 250 mV, the ILED pin needs to be pulled high. The feedback voltage has a direct effect on the converter efficiency. Because the voltage drop across the feedback resistor does not contribute to the output power (LED brightness), the lower the feedback voltage the higher the efficiency. Especially when powering only three or less LEDs, the feedback voltage impacts the efficiency around 2% depending on the sum of the forward voltage of the LEDs. To take advantage of this, the ILED pin can be connected to VIN, setting the feedback voltage to 250 mV. An undervoltage lockout prevents mis-operation of the device at input voltages below typical 1.65 V. When the input voltage is below the undervoltage threshold the device remains off and both internal MOSFETs are turned off providing isolation between input and output. An internal thermal shutdown is implemented and turns off the internal MOSFETs when the typical junction temperature of 160 °C is exceeded. The thermal shutdown has a hysteresis of typically 15°C. The TPS6106x is available in Chipscale package and has the following mechanical dimensions: E=D=1.446mm (typ), E=D=1.424mm (min), E=D=1.5mm (max). Please refer to mechanical drawing of the package (YZF). 11 |
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