423 / 2019-02-26 18:06:03

Analysis and design of a low-power integrated controllable high-voltage start-up current source

Start-up, current source, power supply, SMPS

全体主题 > Power Electronics

A low-power integrated controllable high-voltage start-up current source for an off-line switched-model power supply chip is presented. The proposed structure features a thick gate oxide MOSFET which is controlled by a voltage sensor. In the supply voltage range of 100-400 V, the sensor can output a steady high voltage. The optimized total area is 0.025 mm2, less than 1 % of a 12 W SPMS chip. Under a 100 V supply voltage, the initial charging time and recharging time are 0.12 s and 0.08 s, with the load of a 10 μF capacitor in parallel with a 20 kΩ resistor, respectively.