World Peace Ansemi NCP81428 Electronic Fuse 50A
- Overview
The NCP81428 is a 12V, 50A parallelable fuse supporting PMBus®. It provides overcurrent protection, overvoltage protection, short-circuit protection, and transient current protection. It supports both standalone and parallel applications.
- Features
- Maximum 80A with programmable OCP settings and 125A short-circuit protection
- VIN range: 5V to 18V
- 0.65 mOhm without the need for R SENSE
- Startup via Pin or PMBus
- Wide voltage range: 2.9V to 5.5V
- Programmable VIN undervoltage/overvoltage
- External soft start programming
- Improved soft start current balancing
- Over-temperature shutdown
- Configurable fault and protection actions (restart or latch)
- Fast short-circuit protection response
- Applications
- Industrial applications
- Server applications
- Data storage
- Internal Block Diagram
Pin Descriptions
- SCL: PMBus clock, grounded if not used.
- SDA: PMBus data, connected to 3.3V if not used.
- ALERT#: Open-drain output.
- ON: High-level voltage input.
- FAULT#_C: Fault communication pin.
- FAULT#_D: Fault communication pin.
- VINF: Controller power input.
- NC1: No connection.
- VIN09: Power input.
- VIN10: Power input.
- VIN11: Power input.
- VIN12: Power input.
- VIN13: Power input.
- VIN14: Power input.
- VIN15: Power input.
- VIN16: Power input.
- NC2: No connection.
- VTEMP: Temperature monitoring.
- SS: Soft start programming pin.
- GND: Ground.
- VDD: Internal linear regulator power output.
- IMON: Current monitoring output.
- PG: Power-good output pin.
- ADDR: PMBus address setting pin.
- VOUT25: Power output.
- VOUT26: Power output.
- VOUT27: Power output.
- VOUT28: Power output.
- VOUT29: Power output.
- VOUT30: Power output.
- VOUT31: Power output.
- VOUT32: Power output.
- VIN33: Power input.
- Protection Features
- Undervoltage Lockout (UVLO): Minimum 4.4V, maximum 4.7V.
- Overvoltage Protection (OVP): Programmable overvoltage minimum and maximum values.
- Undervoltage Protection (UVP): Triggered when feedback voltage is below the set voltage, minimum 75mV, maximum 125mV.
- Overcurrent Protection (OCP): Accuracy of ±10%.
- Over-temperature Protection (OTP): Programmable over-temperature fault threshold range from 80°C to 150°C.
- Short-circuit Protection (SCP): Maximum short-circuit current threshold of 165A.
- Application Circuit Diagram
7. Power Validation:
A: Transient Current Load (0A to 50A) CH1: Output Voltage CH2: Output Current
B: Switching Test CH1: Input Voltage CH2:EN CH3: Output Voltage CH4:PG
C: Overcurrent Protection Test CH1: Input Voltage CH2: Output Current CH3: Output Voltage CH4:PG
D: Overvoltage Protection Test CH1: Input Voltage CH2:PG CH3: Output Voltage
- Summary
The NCP81428 is suitable for 12V server input applications. It effectively protects against front-end abnormalities, preventing damage to downstream components caused by abnormal conditions. It also allows configuration via PMBus as needed.