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Número de pieza | ICE3BR0680JZ | |
Descripción | Off-Line SMPS Current Mode Controller | |
Fabricantes | Infineon Technologies | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de ICE3BR0680JZ (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
No Preview Available ! Version 2.1a, 11 Jan 2012
®
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1 page CoolSET®-F3R80
ICE3BR0680JZ
5 CoolMOS® Performance Characteristic . . . . . . . . . . . . . . . . . . . . . . . . . .27
6 Input Power Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
7 Outline Dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
8 Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
9 Schematic for recommended PCB layout . . . . . . . . . . . . . . . . . . . . . . . .32
Version 2.1a
5
11 Jan 2012
http://www.Datasheet4U.com
5 Page CoolSET®-F3R80
ICE3BR0680JZ
Functional Description
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.
.
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 300us such that the current sink
decrease gradually and the duty ratio of the gate drive
increases gradually. The Soft Start will be finished in
10ms (tSoft-Start) after the IC is switched on. At the end of
the Soft Start period, the current sink is switched off.
Within the soft start period, the duty cycle is increasing
from zero to maximum gradually (see Figure 12).
V S o ftS
VSOFTS32
tSoft-Start
VSoftS
VSoftS2
VSoftS1
Gate
Driver
t
t
Figure 10 Soft Start Phase
When the VVCC exceeds the on-threshold voltage, the
IC starts the Soft Start mode (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 (Figure 11).
Figure 12 Gate drive signal under Soft-Start Phase
In addition to Start-Up, Soft-Start is also activated at
each restart attempt during Auto Restart.
V SoftS
VSOFTS32
tSoft-Start
5V
SoftS
RSoftS
VFB
t
4.5V
Soft Start 32I 8I 4I 2I
Counter
I
VOUT
VOUT
tS ta rt-U p
Figure 11 Soft Start Circuit
Version 2.1a
Figure 13 Start Up Phase
11
t
t
11 Jan 2012
http://www.Datasheet4U.com
11 Page |
Páginas | Total 30 Páginas | |
PDF Descargar | [ Datasheet ICE3BR0680JZ.PDF ] |
Número de pieza | Descripción | Fabricantes |
ICE3BR0680JZ | Off-Line SMPS Current Mode Controller | Infineon Technologies |
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