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ICE3BR4765JZ Datasheet(PDF) 11 Page - Infineon Technologies AG

Part No. ICE3BR4765JZ
Description  Off-Line SMPS Current Mode Controller
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Maker  INFINEON [Infineon Technologies AG]
Homepage  http://www.infineon.com
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 11 page
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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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