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PDF 3BR4765JZ Data sheet ( Hoja de datos )
| Número de pieza | 3BR4765JZ | |
| Descripción | ICE3BR4765JZ | |
| Fabricantes | Infineon Technologies | |
| Logotipo |  |
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Version 2.1, 30 Aug 2011
®
Never stop thinking.
Free Datasheet http://www.datasheet4u.com/
1 page  
ICE3BR4765JZ
6 Input Power Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
7 Outline Dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
8 Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
9 Schematic for recommended PCB layout . . . . . . . . . . . . . . . . . . . . . . . .29
Version 2.1
5 30 Aug 2011
Free Datasheet http://www.datasheet4u.com/
5 Page 
3.4 Startup Phase
S oft S tart counter
ICE3BR4765JZ
Functional Description
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).
S oftS
S oft S tart
S oft S tart
S oft-S tart
C om parator
C7 &
G7
G ate D river
5V
SoftS
RSoftS
0 .6 7 V
PWM OP
x 3 .3
Soft Start 32I 8I 4I 2I
Counter
I
CS
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 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.
VSoftS
VSOFTS32
TSoft-Start
VSoftS
VSoftS2
VSoftS1
Gate
Driver
t
Figure 10 Soft Start Phase
Version 2.1
t
Figure 12 Gate drive signal under Soft-Start Phase
11 30 Aug 2011
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 32 Páginas | |
| PDF Descargar | [ Datasheet 3BR4765JZ.PDF ] | |
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