Ultra-High Voltage Start-up Controller for 40- to 5000-Vac Power Converters
MORNSUN recently launched its ultra-high input voltage start-up controllers, the SCM9601A and SCM9602A, in a SOT-23 package for use in ac-dc switching power converters. These ICs are well-suited for applications such as photovoltaic inverters, wind power, high-voltage H-bridge, etc.
The SCM9601A has a built-in 700V high voltage transistor that can operate with an input voltage from 40Vdc up to 700Vdc. The output is a constant charging current into the bypass capacitor of the switching power supply to start the controller chip.
After the controller started up, the starter continues to deliver power for some time and increases the capacitive load capability of the power supply. The SCM9602A is designed for high-voltage applications such as photovoltaic inverters. To meet the requirement of photovoltaic industry, SCM9602A and SCM9601A can be used in series so that its input voltage range extends to 40- to 5000-Vdc.
To avoid damage to the controller and the power system, the SCM9601A can sense the appropriate fault protection mode if the VDD bypass capacitor is too small or when the power supply output is in
Features of SCM9601A are as follows,
- Built-in 700V high voltage transistor that can operate with an input voltage from 40Vdc up to 700Vdc
- The output is a constant charging current into the bypass capacitor of the switching power supply to start the controller chip. After the controller started up, the starter continues to deliver power for some time and increases the capacitive load capability of the power supply.
- To avoid damage to the controller and the power system, the SCM9601A can sense the appropriate fault protection mode if VDD bypass capacitor is too small or when the power supply output is in short circuit condition.
