M51996AP/AFP

REJ03D0836-0201 Rev.2.01 Nov 14, 2007

Page 13 of 35

Function Description

Type M51996AP and M51996AFP are especially designed for off-line primary PWM control IC of switching mode

power supply to get DC voltage from AC power supply.

Using this IC, smart SMPS can be realized with reasonable cost and compact size as the number of external electric

parts can be reduced and also parts can be replaced by reasonable one.

In the following circuit diagram, MOS FET is used for output transistor, however bipolar transistor can be replaced with

no problem.

Start-up Circuit Section

The start-up current is such low current level as typical 100

µA, as shown in figure 1, when the V

In this voltage range, only a few parts in this IC, which has the function to make the output voltage low level, is alive

≈ 11 mA

≈ 100 µA

(STOP)

≈ 9.9 V

(START)

≈ 16.2 V

Figure 1 Circuit Current vs. Supply Voltage