TPS61195数据手册集成电路（IC）的LED驱动器规格书PDF

描述 Description

The TPS61195 IC provides highly integrated solutions for large-size LCD backlighting. This device has a built-in high efficiency boost regulator with integrated 2.5A/50V power MOSFET. The eight current sink regulators provide high precision current regulation and matching. In total, the device can support up to 96 LEDs. Unused sinks are disabled by tying them to ground. The boost output automatically adjusts its voltage to the WLED forward voltage to improve efficiency. The TPS61195 supports multiple brightness dimming methods. During PWM dimming, each IFB pin’s current is turned on/off at the duty cycle and frequency determined by an integrated pulse width modulation (PWM). The frequency of this signal is resistor programmable, while the duty cycle is controlled directly either from an external PWM signal input to the DPWM pin or through the SMBUS interface. Additionally, the SMBUS interface provides some operational reporting data such as if one or more strings have failed or if the IC is over-heating. In direct PWM dimming mode, each IFB current is turned on/off at same duty cycle and frequency as the PWM signal input on the DPWM pin. In analog dimming mode, the input PWM duty cycle information is translated to analog signal to control the WLED current signal linearly over 1% to 100% brightness area. The TPS61195 integrates over-current and short-circuit protection, soft start and over temperature protection circuit. The device also provides programmable output over-voltage protection, and the threshold is adjusted by external resistor divider combination. The TPS61195 IC has built-in linear regulator for the IC supply. The device is in a 4×4 mm QFN package.

特性 Features

• 4.5V to 21V Input Voltage
• Integrated 2.5A 50V MOSFET
• 600kHz to 1MHz Programmable Switching Frequency
• Adaptive Boost Output for Best Efficiency
• Designed to Use Small L-C Components
• Internal Loop Compensation
• Eight Current Sinks of 30mA
• Support up to Total 96 LEDs
• 1% Current Matching
• PWM and SMBus Brightness Interface
• 8-bits (256 steps) Brightness Level
• Programmable Over Voltage Threshold
• Built-in WLED Open/Short Protection
• Over Thermal Protection
• 28L 4×4 WQFN
• APPLICATIONS
• Notebook/Netbook LCD Display Backlighting