TPS92515/15HV/15-Q1/15HV-Q1 Buck LED Drivers

Texas Instruments' TPS92515 devices are compact, monolithic switching regulators integrating a low-resistance N-channel MOSFET. The devices are intended for high-brightness LED lighting applications where efficiency, high bandwidth, PWM, and/or analog dimming and small size are important.

The regulator operates using a constant off-time, peak current control. The operation is simple: after an off-time based on the output voltage, an on-time begins. The on-time ends once the inductor peak current threshold is reached. The TPS92515 device can be configured to maintain a constant peak-to-peak ripple during the ON and OFF periods of a shunt FET dimming cycle. This is ideal for maintaining a linear response across the entire shunt FET dimming range.

Steady-state accuracy is aided by the inclusion of a low-offset, high-side comparator. LED current can be modulated using either analog or PWM dimming, or both simultaneously. Other features include UVLO, wide input voltage operation, inherent LED open operation, and a wide operating temperature range with thermal shut-down.

The TPS92515 and TPS92515-Q1 devices have an operational input range up to 42 V. The TPS92515HV and TPS92515HV-Q1 offer high-voltage options with an input range up to 65 V. All are available in a thermally enhanced, 10-pin HVSSOP package.