NR117K |Sanken Electric

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NR117K

Data Sheetdownload (PDF:729.08KB)
Application Note

Description

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.

Application

・On-board local power supplies
・Power supply for OA equipment
・For stabilization of the secondary-side output voltage of
 regulators
・Power supply for telecommunication

Features

・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

Remarks

Package

Package Name:HSOP8

Package Diagram

Design Support

Specifications

Built-in PowerYES
Output Voltage0.8V to 24V
Output Current1.5A
Input Voltage Range8V to 31V
Operating Frequency30kHz
Synchronous/AsynchronousAsynchronous
Current Mode ControlYES
Maximum Input Voltage31.0V
Minimum Input Voltage8.0V
Output on/offYES
Low ESR Capacitor SupportYES
Overcurrent ProtectionDrooping Type
Phase CompensationBuilt-in
Thermal ProtectionYES
UVLOYES

Representative Circuit

Internal Block Diagram

Pin-Out Diagrams

Data Sheetdownload (PDF:729.08KB)
Application Note
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