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IR3093M bảng dữ liệu(PDF) 21 Page - International Rectifier

tên linh kiện IR3093M
Giải thích chi tiết về linh kiện  3 PHASE OPTERON, ATHLON, OR VR10.X CONTROL IC
PDF  39 Pages
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nhà sản xuất  IRF [International Rectifier]
Trang chủ  http://www.irf.com
Logo IRF - International Rectifier

IR3093M bảng dữ liệu(HTML) 21 Page - International Rectifier

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IR3093
Page 21 of 39
07/15/04
Figure 8 – Operating Waveforms
Soft-start delay time
tSSDEL is the time SS/DEL charged up to 1.1V. After that the error amplifier output is released
to allow the soft start. The soft start time
tSS represents the time during which converter output voltage rises from
zero to VO. tSS can be programmed by CSS using equation (4).
O
SS
O
SS
CHG
SS
V
t
V
t
I
C
*
10
*
60
*
6
(4)
Once CSS is chosen, the soft start delay time
tSSDEL, the over-current fault latch delay time tOCDEL, and the delay
time
tVccPG from output voltage (VO) in regulation to Power Good are fixed and shown in equation (5), (6) and (7)
respectively.
6
10
*
60
1
.
1
*
*
'
SS
CHG
SS
SSDEL
C
I
V
C
t
(5)
6
10
*
61
25
.
0
*
*
'
SS
DISCHG
SS
OCDEL
C
I
V
C
t
(6)
6
10
*
60
)
1
.
1
75
.
3
(
*
*


'
O
SS
CHG
SS
VccPG
V
C
I
V
C
t
(7)
Over Current Protection (OCP)
The current limit threshold is set by a resistor connected between the OCSET and VDAC pins. If the average
Current Sense Amplifier output plus VDAC voltage exceeds the OCSET voltage, the over-current protection is
triggered.
VCC
START-UP
NORMAL OPERATION
HICCUP OVER-CURRENT
PROTECTION
RE-START
AFTER OCP
CLEARS
POWER-DOWN
7.4V
UVLO
(12V)
5VUVL
4.36V
SS/DEL
3.75V
PWRGD
VOUT
IOUT
(5VUVL GATES
FAULT MODE)
(VCC GATES
FAULT MODE)
1.1V
(VOUT CHANGES DUE TO
LOAD AND VID CHANGES)
OCP
DELAY
OCP THRESHOLD



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