Electronic fuse covers 8-48V and up to 4A
- Автор:Ella Cai
- Отпустите на:2018-07-11
STEF01 is an 8-48V 4A programmable electronic fuse from STMicroelectronics.
When connected in series to the main power rail, it protects the load against over-current and over-voltage.
Voltage is clamped to a user-defined maximum, preset with external resistors. Excessive current is restricted to the programmed safe limit by controlling the internal power mosfet, and folds-back to a lower limit if a heavy over-current or short-circuit is detected.
The device is made using the firm’s BCD8 high-voltage process and integrates a 30mΩ VIPower mosfet.
Features include dV/dt control to prevent excessive in-rush current at start-up or hot-swap insertion. “This slows the output-voltage ramp-up time to at least 3ms, which can be increased if desired by connecting an external capacitor.”, said ST.
Under-voltage lock-out (UVLO) can be set using external components to suit the load requirements.
Then there is thermal shut-down, with a choice of latching or auto-retry, and maximum dissipated-power protection to protect the device from damage when starting loads with large capacitance, or during large load transients, or short-circuits at high voltage.
A power-good indicator and an enable/fault pin allow for status monitoring and control of the the device.
Should reverse current protection be required, a gate-driver has been built in to feed an external mosfet.
It comes in a 14pin HTSSOP14 package, operation is over -40 to 125 °C, and the STEF01 is intended for applications including: industrial hot-swap boards, industrial control equipment, circuit breakers, power busses, security systems, lighting, telecoms power, or distributed power systems.
When connected in series to the main power rail, it protects the load against over-current and over-voltage.
Voltage is clamped to a user-defined maximum, preset with external resistors. Excessive current is restricted to the programmed safe limit by controlling the internal power mosfet, and folds-back to a lower limit if a heavy over-current or short-circuit is detected.
The device is made using the firm’s BCD8 high-voltage process and integrates a 30mΩ VIPower mosfet.
Features include dV/dt control to prevent excessive in-rush current at start-up or hot-swap insertion. “This slows the output-voltage ramp-up time to at least 3ms, which can be increased if desired by connecting an external capacitor.”, said ST.
Under-voltage lock-out (UVLO) can be set using external components to suit the load requirements.
Then there is thermal shut-down, with a choice of latching or auto-retry, and maximum dissipated-power protection to protect the device from damage when starting loads with large capacitance, or during large load transients, or short-circuits at high voltage.
A power-good indicator and an enable/fault pin allow for status monitoring and control of the the device.
Should reverse current protection be required, a gate-driver has been built in to feed an external mosfet.
It comes in a 14pin HTSSOP14 package, operation is over -40 to 125 °C, and the STEF01 is intended for applications including: industrial hot-swap boards, industrial control equipment, circuit breakers, power busses, security systems, lighting, telecoms power, or distributed power systems.
