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TPS61042DRBR Datasheet(PDF) 1 Page - Texas Instruments |
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TPS61042DRBR Datasheet(HTML) 1 Page - Texas Instruments |
1 / 27 page ![]() www.ti.com FEATURES DESCRIPTION APPLICATIONS VIN CTRL SW OVP GND L1 4.7 mH Rs 13 W D1 Vin 1.8 V to 6 V FB LED RS Enable/PWM Brightness Control 100 Hz to 50 kHz CO† 100 nF Cin 4.7 mF 3 5 6 4 8 7 1 2 TPS61042 SLVS441C – DECEMBER 2002 – REVISED MARCH 2007 CONSTANT CURRENT LED DRIVER • Current Source With Overvoltage Protection The TPS61042 is a high frequency boost converter with constant current output that drives white LEDs • Input Voltage Range . . 1.8 V to 6 V or similar. The LED current is set with the external • Internal 30 V Switch sense resistor (RS) and is directly regulated by the • Up to 85% Efficiency feedback pin (FB) that regulates the voltage across • Precise Brightness Control Using PWM Signal the sense resistor RS to 252 mV (typ). To control LED brightness, the LED current can be pulsed by or Analog Signal applying a PWM (pulse width modulated) signal with • Switching Frequency . . Up to 1 MHz a frequency range of 100 Hz to 50 kHz to the control • Internal Power MOSFET Switch . . 500 mA pin (CTRL). To allow higher flexibility, the device can be configured where the brightness can be controlled • Operates With Small Output Capacitors Down by an analog signal as well, as described in the to 100 nF application information section. To avoid possible • Disconnects LEDs During Shutdown leakage currents through the LEDs during shutdown, • No Load Quiescent Current . . 38 µA Typ the control pin (CTRL) disables the device and disconnects the LEDs from ground. For maximum • Shutdown Current . . 0.1 µA Typ safety during operation, the output has integrated • Available in a Small 3 mm × 3 mm QFN overvoltage protection that prevents damage to the Package device in case of a high impedance output (e.g. faulty LED). • White LED Supply for Backlight/Sidelight Displays – PDA, Pocket PC, Smart Phones – Handheld Devices – Cellular Phones † Larger output capacitor values like 1 µF and larger, reduce the LED ripple current and improve line regulation. Figure 1. Typical Application 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. PRODUCTION DATA information is current as of publication date. Copyright © 2002–2007, 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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