TPS92511DDA集成电路（IC）的LED驱动器规格书PDF中文资料

TPS92511DDA属于集成电路（IC）的LED驱动器。由德州仪器制造生产的TPS92511DDALED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。

1 Features

1• Wide Input Voltage Range: 4.5 V to 65 V

• Requires NO External Current Sensing Resistor

• Requires NO External Loop Compensation

• Ease of Use, Needs Minimum 5 Components

• 1000:1 Contrast Ratio Feasible

• Single Layer PCB Feasible

• Can Work as High Voltage Buck Regulators

• Can Work as Linear Current Shunt Regulators

• Integrated Low-side N-channel MOSFET

• LED Current Programmable up to 0.5 A

• Typically ±3.6% LED Current Accuracy

• Switching Frequency Programmable From 50 kHz

to 500 kHz

• Current Limit Protection

• VCC Under-voltage Lock-out

• Thermal Shutdown Protection

• Support Analog Dimming and Thermal Foldback

• Power Enhanced SOIC-8 Exposed Thermal Pad

Package (HSOP-8)

2 Applications

• High Power LED Driver

• Architectural Lighting

• Office Troffer

• Automotive Lighting

• MR-16 LED Lamp

3 Description

The TPS92511 is an easy to use 65V constant

current buck converter for driving a single LED string with current up to 0.5A and efficiency up to 95%.

Only 5 external components are required for basic

operation and single layer PCB layout is feasible

because of the integration of a N-MOSFET, no external current sensing resistor, no external

compensation and the proper terminal assignment. A

high-value external resistor programs the LED current

so that fine tuning of the LED current can be

achieved. Another high-value external resistor programs a constant switching frequency from 50kHz

to 500kHz. EMI design becomes easier as a result of

constant switching frequency. The TPS92511

provides a wide input voltage range from 4.5V to

65V. By adding simple external circuits, the device can handle applications with even higher input

voltages.

The TPS92511 employs a proprietary control scheme

to regulate the LED current without the need of

sensing the LED current directly. It applies a floating

buck topology with a low-side N-channel power

MOSFET, which does not need boot-strapping capacitor. For multiple channel systems, the floating

buck topology together with the proprietary control

scheme allows a common-anode connection of the

LED strings without an external current sensing

network. This significantly reduces the number of wiring and as well as overall manufacturing cost.

The TPS92511 has very fast PWM dimming response time. For example, if the switching frequency is 500

kHz, the minimum DIM pulse width is 6μs and the

dimming frequency is 150Hz, a contrast ratio of more

than 1000:1 can be achieved.

The TPS92511 is available in the Power Enhanced

SOIC-8 exposed thermal pad package.