NR117K is a step-down regulator IC with built-in power MOSFET. With the current mode control, ultra low ESR capacitors such as ceramic capacitors can be used. The ICs have protection functions such as Over-Current Protection (OCP), Under-Voltage Lockout (UVLO) and Thermal Shutdown (TSD).In order to protect the IC against in-rush current at start-up, the soft start function is provided. The soft start time can be set by connecting external capacitors. A function to turn on/off by external signals is provided and by sending external signals to the EN terminal, NR117K can be turned on/off.The setting value for OCP can be adjusted by the external resistor. Few external components required with built-in phase compensation circuit.This device is supplied in a compact and thin HSOP 8-pin package with heat slug on the back side. To increase efficiency under light load conditions, operating frequency changes on a certain load current condition.
Feature
- Up to 90% Efficiency
- Up to 68% Efficiency at light load (VIN=12V/Vo=5V/Io=10mA)
- Current mode PWM control
- Output current: Up to 1.5A
- Operating Frequency: 30kHz
- Low ESR capacitors such as ceramic capacitors can be used for output.
- Built-in protection circuit Overcurrent protection (OCP) Drooping type: auto restart Thermal shutdown （TSD）: auto restart Undervoltage lockout (UVLO) circuit
- Built-in phase compensation, with no need for external components
- Adjustable Soft-Start with an external capacitor
- External ON/OFF function
- HSOP8 package
Applications
- On-board local power supplies
- Power supply for OA equipment
- For stabilization of the secondary-side output voltage of regulators
- Power supply for telecommunication
