JAJSEC9D May 2014 – January 2018 TPS6213013A-Q1 , TPS62130A-Q1 , TPS62133A-Q1
PRODUCTION DATA.
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The TPS62130A-Q1 can be used as a power supply for power LEDs. The FB pin can be easily set down to lower values than nominal by using the SS/TR pin. With that, the voltage drop on the sense resistor is low, avoiding excessive power loss. Since this pin provides 2.5µA, the feedback pin voltage can be adjusted by an external resistor per Equation 15. This drop, proportional to the LED current, is used to regulate the output voltage (anode voltage) to a proper level to drive the LED. Both analog and PWM dimming are supported with the TPS62130A-Q1. Figure 44 shows an application circuit, tested with analog dimming:
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The resistor at SS/TR sets the FB voltage to a level of about 300mV and is calculated from Equation 15.
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The device now supplies a constant current, set by the resistor at the FB pin, by regulating the output voltage accordingly. The minimum input voltage has to be rated according the forward voltage needed by the LED used. More information is available in the Application Note SLVA451.