ICE3BR1465JF datasheet(11/36 Pages) INFINEON

Numer części	ICE3BR1465JF

Szczegółowy opis	Off-Line SMPS Current Mode Controllerwith integrated 650V CoolMOS짰 and Startup cell (frequency jitter Mode) in FullPak

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Producent	INFINEON [Infineon Technologies AG]

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CoolSET®-F3R

ICE3BR1465JF

Functional Description

Version 2.1

11

7 May 2011

3.4

Startup Phase

Figure 9

Soft Start

In the Startup Phase, the IC provides a Soft Start

period to control the primary current by means of a duty

cycle limitation. The Soft Start function is a built-in

function and it is controlled by an internal counter.

.

Figure 10

Soft Start Phase

When the VVCC exceeds the on-threshold voltage, the

IC starts the Soft Start mode (see Figure 10).

The function is realized by an internal Soft Start

resistor, an current sink and a counter. And the

amplitude of the current sink is controlled by the

counter (see Figure 11).

Figure 11

Soft Start Circuit

After the IC is switched on, the VSOFTS voltage is

controlled such that the voltage is increased step-

wisely (32 steps) with the increase of the counts. The

Soft Start counter would send a signal to the current

sink control in every 600us such that the current sink

decrease gradually and the duty ratio of the gate drive

increases gradually. The Soft Start will be finished in

20ms (tSoft-Start) after the IC is switched on. At the end of

the Soft Start period, the current sink is switched off.

Figure 12 Gate drive signal under Soft-Start Phase

S o ft-S ta rt

C o m p a ra to r

S o ft S ta rt

&

G 7

C 7

G a te D riv e r

0 .6 8 V

x 3 .3

P W M O P

C S

S o ft S ta rt c o u n te r

S o ft S ta rt

S o ftS

VSoftS

VSoftS2

VSoftS1

5V

RSoftS

Soft Start

Counter

I

2I

4I

SoftS

8I

32I

t

VSOFTS32

VSoftS

Gate

Driver

t

tSoft-Start

Podobny numer części - ICE3BR1465JF

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