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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.