TPS61185 - 具有 PWM 控制接口的用于笔记本电脑的 2A WLED 驱动器

TPS61185是TI德州仪器公司的一款背光产品，TPS61185是具有 PWM 控制接口的用于笔记本电脑的 2A WLED 驱动器，本站介绍了TPS61185的封装应用图解、特点和优点、功能等，并给出了与TPS61185相关的TI元器件型号供参考。

TPS61185 - 具有 PWM 控制接口的用于笔记本电脑的 2A WLED 驱动器 - 背光 - LED驱动器 - 德州仪器

产品描述

The TPS61185 IC provides highly integrated solutions for large-size LCD backlighting. This device has a built-in high efficiency boost regulator with integrated 2 A/40 V power MOSFET. The eight current sink regulators provide high precision current regulation and matching. In total, the device can support up to 80 LEDs. In addition, the boost output automatically adjusts its voltage to the WLED forward voltage to improve efficiency.

The TPS61185 supports the PWM method for brightness dimming. Simply tie the unused current sinks to ground if fewer than eight are needed. During PWM dimming, each of the eight current regulators is turned on/off at the duty cycle determined by an external pulse width modulation (PWM) signal input to the PWM pin. The frequency at which each current regulator turns on/off follows the input PWM signal on the PWMIN pin if the MODE pin is grounded. If the MODE pin is left floating or tied high, the regulators turn on/off at the frequency programmed by an external resistor on the FPWMO pin.

The TPS61185 IC supports boost switch frequency programming from 600kHz to 2MHz by an external resistor on the FSW pin. The device also provides a driver output for an optional external PFET connected between the input and inductor for truly disconnecting the battery from LED during the shutdown or fault protection. The device integrates resistor programmable over-voltage protection, soft-start, and thermal shutdown.

The TPS61185 IC has a built-in linear regulator to power the internal circuits of the IC. The device is in a 4 mm × 4 mm QFN package.

产品特性

4.2 V to 24 V Input Voltage
Integrated 2 A/40 V MOSFET
600 kHz to 2 MHz Programmable Switching Frequency
Adaptive Boost Output for Best Efficiency
Design to Use Small L-C Components
Integrated Loop Compensation
Eight 25 mA Current Sinks
Up to 10 WLED in Series
1% Current Matching and Accuracy
PWM Brightness Interface Control
200 mV Ripple Under PWM Dimming
Driver for Input/Output Isolation PFET
Programmable Over Voltage Threshold
100 Hz to 5 kHz Programmable PWM Dimming Frequency
Up to 20 kHz Direct PWM Dimming Frequency
Enhanced Electrostatic Discharge Immunity Level
Built-in WLED Open/Short Protection
Over Temperature Protection
24 Pin 4 mm × 4 mm QFN Package
APPLICATIONS
- Notebook LCD Display Backlight

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