SLVSDW2B December 2018 – November 2020 TPS23755
PRODUCTION DATA
Converters require a soft-start on the voltage error amplifier to prevent output overshoot on startup. In PoE applications, the PD also needs soft-start to limit its input current at turnon below the limit allocated by the power source equipment (PSE).
The TPS23755 provides primary side closed loop controlled soft-start, which applies a slowly rising ramp voltage to a second control input of the error amplifier. The lower of the reference input and soft-start ramps controls the error amplifier, allowing the output voltage to rise in a smooth monotonic fashion.
The soft-start period of the TPS23755 is internally set to a nominal value of 16 ms.