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TPS61061DRB Datasheet(PDF) 1 Page - Texas Instruments |
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TPS61061DRB Datasheet(HTML) 1 Page - Texas Instruments |
1 / 22 page www.ti.com FEATURES APPLICATIONS DESCRIPTION TYPICAL APPLICATION VIN EN GND SW FB OUT ILED PGND VIN 2.7 V to 6 V C1 1 mF L1 22 mH RS 12 W C2 220 nF TPS61060 TPS61061 TPS61062 SLVS538 – NOVEMBER 2004 CONSTANT CURRENT LED DRIVER WITH DIGITAL AND PWM BRIGHTNESS CONTROL • Up to 80% Efficiency • LED Driver With Integrated Overvoltage and • 8-Pin NanoFree™Package (Chipscale, CSP) Short-Circuit Protection • 3 × 3-mm QFN Package • 2.7-V to 6.0-V Input Voltage Range • 500-mV/250-mV Feedback Voltage • White LED Driver • TPS61060 Powers Up to 3 LEDs • Cellular Phones • TPS61061 Powers Up to 4 LEDs • PDA, Pocket PC, and Smart Phones • TPS61062 Powers Up to 5 LEDs • Digital Still Camera • PWM Brightness Control on Enable • Handheld Devices • Digital Brightness Control on ILED • 1.0-MHz Fixed Switching Frequency • 400-mA Internal Power MOSFET Switch • LEDs Disconnected During Shutdown • Operates With Small-Output Capacitors Down to 220 nF The TPS61060/61/62 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 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. Figure 1. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. NanoFree, PowerPAD are trademarks of Texas Instruments. PRODUCTION DATA information is current as of publication date. Copyright © 2004, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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