Summary of STPW12 – PROGRAMMABLE ELECTRONIC POWER BREAKER FOR 12V BUS
The STPW12 is an integrated electronic power breaker designed to monitor input power and disconnect circuits when consumption exceeds a set limit. It features automatic reconnection after a programmable delay, real-time power sensing, PWM control, and thermal protection within a 10.5 V to 18 V range.
Parts used in the STPW12 Project:
- Integrated electronic power breaker (STPW12)
- Power rail
- Electronic circuitry load
- Board monitoring circuits
- Fault pin
- Monitor pin
- Enable/Disable pin
- PWM pin
- External signal source for PWM mode
- Internal power switch
The STPW12 is an integrated electronic power breaker, optimized to monitor the input power. Connected in series to the power rail, it is able to disconnect the electronic circuitry on its output if the power consumption overcomes the programmed limit. When this happens, the device automatically opens the integrated power switch and disconnects the load.
The intervention of the protection is communicated to the board monitoring circuits through a signal on the fault pin.
After a certain delay time, programmable by the user, the device automatically tries again to close the internal switch and re-connect the load.
A dedicated monitor pin provides the user with continuous information on the monitored power.
The device can be enabled/disabled through a dedicated pin, and a direct PWM mode can be implemented providing PWM pin with an external signal.
Key features
- Real-time input power sensing
- Input voltage range: from 10.5 V to 18 V
- Continuous current typ.: 1.5 A
- P-channel on resistance typ.: 50 mΩ
- Power limit accuracy typ.: 3%
- Undervoltage lockout
- Adjustable power limitation
- PWM mode
- Programmable power limit masking time
- Programmable auto-retry delay
- Thermal shutdown
- Enable function
- Short-circuit current limit
- Operative junction temp. – 40 °C to 125 °C
- Available in power SO8 package
- Simplifies UL compliance and certification
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How does the device handle power overconsumption?
The device automatically opens its internal power switch to disconnect the load when power consumption exceeds the programmed limit. -
Can the auto-retry delay be customized?
Yes, the delay time before the device attempts to reconnect the load is programmable by the user. -
What voltage range does the STPW12 support?
The device operates with an input voltage range from 10.5 V to 18 V. -
Does the device provide continuous power information?
A dedicated monitor pin provides the user with continuous information on the monitored power. -
How is the device enabled or disabled?
The device can be enabled or disabled through a dedicated pin. -
Is PWM mode supported?
Yes, a direct PWM mode can be implemented by providing the PWM pin with an external signal. -
What happens if the temperature gets too high?
The device includes a thermal shutdown feature to protect itself. -
How is the fault condition communicated?
The intervention of the protection is communicated to the board monitoring circuits through a signal on the fault pin.
