SLUSBP5E March 2014 – July 2018 TPS92601-Q1 , TPS92602-Q1
UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA.
The output overvoltage protection threshold of the TPS92602y-Q1 device is externally adjustable using a resistor divider network. In the application circuit of Figure 16, this divider network comprises R1 and R3 for channel1 and R2 and R4 for channel2. The following equation gives the relationship of the overvoltage-protection threshold (V(OVPT)) to the resistor divider.
The load is nine white LEDs, the forward voltage is about 30 V. For an overvoltage protection margin of 20%, V(OVPT) is: V(OVPT) = 30 × 1.2 = 36 V. So R1 / R3 = R2 / R4 = (36 – 2.2) / 2.2 = 15.36. Select R3 = R4 = 30 kΩ; then R1 = R2 = 460 kΩ. Use the nearest standard value of 464 kΩ.