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首 页 > 新闻动态 > 公司新闻 > 供应 TPS61060DRBR TI QFN8 恒定电流LED驱动器与数字和PWM亮度控制 供应 TPS61060DRBR TI QFN8 恒定电流LED驱动器与数字和PWM亮度控制FEATURES
APPLICATIONS DESCRIPTION TYPICAL APPLICATION VIN EN GND SW FB OUT ILED PGND VIN 2.7 V to 6 V C1 1 F L1 22 H RS 12 C2 220 nF TPS61060 TPS61061 TPS61062 SLVS538A–NOVEMBER 2004–REVISED APRIL 2005 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-V Input Voltage Range · 500-mV/250-mV Feedback Voltage · TPS61060 Powers Up to 3 LEDs · White LED Driver · TPS61061 Powers Up to 4 LEDs · Cellular Phones · TPS61062 Powers Up to 5 LEDs · PDA, Pocket PC, and Smart Phones · Digital Still Camera · PWM Brightness Control on Enable · Handheld Devices · Digital Brightness Control on ILED · 1-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 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. 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. PowerPAD is a trademark of Texas Instruments. NanoFree is a registered trademark of Texas Instruments. PRODUCTION DATA |
