IX9907N datasheet(6/10 Pages) IXYS

6 / 10 page

INTEGRATED CIRCUITS DIVISION

IX9907

www.ixysic.com

R02

2. Functional Description

Figure 1 IX9907 Typical Application

2.1 Soft Start

Once the main input voltage is applied, a rectified

voltage will appear across CIN. VCC capacitor (CVCC)

will be charged during the power-up phase of

operation through an external transistor. Once VCC

reaches VVCC_on (typically 18V), the device will

initiate a soft-start sequence. This is intended to

minimize the electrical stresses on the device’s

MOSFET power switch, DOUT, DVCC, and the

transformer. The soft-start operates as shown in

Figure 2. The duration of this soft-start is 12mS

nominal and steps VCS, the current sense voltage, to

four values, as shown.

Figure 2 Start-Up

IN1

IN2

VCC

ZCV1

ZCV

ZCV2

VCC

SNUBBER

OUT

Aux

GND

ZCV DRAIN

SOURCE

IX9907

LEDs

Time (ms)

01 2345 6 7 8 9 10111213 1415

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

Maximum Current (Sense Voltage)

During Soft-Start

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