TPS92001EVM-628: 330mA @ 34V Max, 120VAC, TRIAC Dim

The TPS92001EVM-628 evaluation module is a constant-current, TRIAC dimmable LED driver. It is designed to drive 9 LEDs at 330 mA and is rated for an AC input of 105 VRMS to 135 VRMS.

The TPS92001/2 family of general LED lighting PWM controllers contains control and drive circuitry required for off-line isolated or non-isolated LED lighting applications. The TPS92001EVM-628 evaluation module uses the TPS92001 as a non-isolated buck controller; more specifically it is an inverting buck topology. The controller operates in fixed-frequency, current-mode switching with minimal external parts count.

In LED illumination applications there is typically no need for the LED load to be referenced to ground. This utilizes the inverted buck which moves the controller and FET to the low side of the circuit, referenced to the lowest voltage, while the LED load is floated (referenced to the highest voltage). With an appropriately designed bias regulator for the controller, we can now use a much lower voltage controller which is more economical.