ICE3BR4765JZ datasheet(11/32 Pages) INFINEON

No. de pieza	ICE3BR4765JZ

Descripción Electrónicos	Off-Line SMPS Current Mode Controller

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Fabricante Electrónico	INFINEON [Infineon Technologies AG]

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ICE3BR4765JZ

Functional Description

Version 2.1

11

30 Aug 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 VSFOFTS 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 r t

C o m p a r a to r

S o ft S ta r t

&

G 7

C 7

G a te D r iv e r

0 .6 7 V

x 3 .3

P W M O P

C S

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

S o ft S ta r t

S o ftS

V

SoftS

V

SoftS2

V

SoftS1

5V

R

SoftS

Soft Start

Counter

I

2I

4I

SoftS

8I

32I

t

VSOFTS32

VSoftS

Gate

Driver

t

TSoft-Start

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ICE3BR4765JZ Datasheet(PDF) 11 Page - Infineon Technologies AG

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