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Número de pieza | ICE3AR4780CJZ | |
Descripción | Off-Line SMPS Current Mode Controller | |
Fabricantes | Infineon | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de ICE3AR4780CJZ (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
No Preview Available ! Version 2.0, 19 Apr 2013
CoolSET®-F3R80
ICE3AR4780CJZ
Off-Line SMPS Current Mode
Controller with integrated 800V
CoolMOS®and Startup cell
(brownout & CCM) in DIP-7
Power Management & Supply
Never stop thinking.
1 page CoolSET®-F3R80
ICE3AR4780CJZ
4.3.7
5
6
7
8
9
CoolMOS® Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
CoolMOS® Perfromance Characteristic . . . . . . . . . . . . . . . . . . . . . . . . . .26
Input Power Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Outline Dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Schematic for recommended PCB layout . . . . . . . . . . . . . . . . . . . . . . . .31
Version 2.0
5 19 Apr 2013
5 Page CoolSET®-F3R80
ICE3AR4780CJZ
Functional Description
3.4 Startup Phase
Soft Start counter
SoftS
Soft Start
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 12).
SoftS
5V
RSoftS
Soft Start
Soft-Start
C om parator
C7 &
G7
Gate Driver
Soft Start 32I 8I 4I 2I
Counter
I
0 .6 V
x3.25
PWM OP
CS
Figure 10 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 12 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 300μs 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 13).
V S oftS
V SO FTS32
tSoft-Start
V SoftS
V S oftS 2
V S oftS 1
G a te
Driver
t
Figure 11 Soft Start Phase
When the VVCC exceeds the on-threshold voltage, the
IC starts the Soft Start mode (Figure 11).
t
Figure 13 Gate drive signal under Soft-Start Phase
Version 2.0
11 19 Apr 2013
11 Page |
Páginas | Total 30 Páginas | |
PDF Descargar | [ Datasheet ICE3AR4780CJZ.PDF ] |
Número de pieza | Descripción | Fabricantes |
ICE3AR4780CJZ | Off-Line SMPS Current Mode Controller | Infineon |
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