TPS92602EVM

TheTPS92602EVMevaluationmodule(EVM)helpsdesignersevaluatetheoperationandperformanceof theTPS92602-Q1 two-channel high-sidecurrent-sensedc-dcMOSFETcontroller. TheTPS92602-Q1, designed todriveautomotivehigh-brightness light-emittingdiodes (LEDs), featuresawide input-voltage range(4.5Vto40V),high-sidecurrentsense,aprecisionreference,switching-frequencysynchronization, analogdimming,PWMdimming,andfulldiagnosticsincludinghigh-sidecurrent (LEDcurrent)availableas analogoutput,open-LEDandshort-to-GNDdetection,andshorted-outputprotection.

1 Detailed Description

1.1 Description

The TPS92602-Q1 is a dual-channel LED driver. The basis for each independent driver is a peak-current mode boost controller. Each controller has a current feedback loop with high-side current-sensing shunt and a voltage-feedback loop with an external resistor-divider network. Each controller has two independent feedback loops, a current-feedback loop with high-side current-sensing shunt and a voltage feedback loop with an external resistor-divider network. The controller delivers a constant output voltage or a constant output current. The connected load determines whether the board is regulating a constant output current (if current set point is reached earlier than voltage set point) or a constant output voltage (if the voltage set point is reached first, for example in an open-load condition).

Each controller supports all typical topologies like boost, boost to battery, SEPIC, or flyback.

Uses for the high-side PMOS FET driver are for PWM dimming of the LED string and for cutoff in case of an external short circuit to GND in order to protect the circuit.

1.2 Typical Applications

This converter design describes an application of the TPS92602-Q1 as an LED driver for the boost and boost-to-battery applications. For applications with a different input voltage range or different output voltage range, see the TPS92602-Q1 data sheet (SLUSBP5).

2 Schematic