Green mode PWM-ICs

FA8A39N

  • Status:Available

FA8A39N is a current-mode switching power supply control IC that can directly drive power MOSFETs. Despite its compact 8-pin package, it has a wide variety of functions, making it ideal for saving power at light loads and reducing the number of external components, thereby enabling the configuration of space-saving and cost-effective power supplies.

Features

  • Low standby power
    1. Incorporates an X-capacitor discharge function. (Reduces loss due to discharge resistance)
    2. Achieves low current consumption. (450 uA typ. during normal operation.)
    3. Incorporates a frequency reduction function to improve efficiency in the mid-load range.
    4. Switches to burst operation at light loads to achieve low standby power consumption.
    5. Incorporates a start-up circuit with a 500 V withstand voltage. (Achieves power savings for the startup circuit)
  • Various protective functions
    1. 2-step detection overload protection (Delay time 2.5 sec typ.). Can handle excessive loads such as those of motors.
    2. Incorporates an overload detection value correction function based on the AC input voltage.
    3. Incorporates secondary-side load short-circuit protection (Delay time 64 msec typ.).
    4. Incorporates a latch stop function using LAT pin pull-up/pull-down.Protective operation is available depending on the application.
    5. Incorporates overvoltage protection. (Vthovp = 30 V typ.)
    6. Incorporates low voltage malfunction prevention. (Vccoff = 6.5 V typ.)
    7. Incorporates brown-in/out function (AC input voltage protective function)
    8. Incorporates a soft start function. (11 msec typ.)
    9. Incorporates minimum on-width function. Suppresses excessive MOSFET drain voltage jumps during power-on and restart.
  • Achieves low EMI using a frequency spread function.
  • Incorporates a drive circuit capable of directly driving power MOSFETs. Output current: 0.5 A (sink)/0.5 A (source)

Applications

  • Switching Power Supplies

Specifications

Controller type PWM
Applied circuit Flyback
Frequency (kHz) 65
VCC(V) 10 to 28
Built-in start up circuit (V) 500
Over load protection Timer-latch
Over voltage protection Latch (VCC)
Package SOP-8

Documentation Tools

Reference Design Power Supply Control IC Reference Design
Design tools Fly-back transformer design
Selection Guide Power Supply Control IC Selection Guide

Appearance

SOP-8

Outline drawing

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