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参数资料
| 型号： | IR3009 |
| 厂商： | International Rectifier |
| 英文描述： | 3 PHASE OPTERON, ATHLON, OR VR10.X CONTROL IC |
| 中文描述： | 3相皓龙，速龙，或控制IC的VR10.X |
| 文件页数： | 21/39页 |
| 文件大小： | 693K |
| 代理商： | IR3009 |
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IR3093
Page 21 of 39
07/15/04
Figure 8
– Operating Waveforms
Soft-start delay time
t
SSDEL
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
t
SS
represents the time during which converter output voltage rises from
zero to V
O.
t
SS
can be programmed by C
SS
using equation (4).
t
I
C
O
SS
O
SS
CHG
SS
V
t
V
*
10
*
60
*
6
(4)
Once C
SS
is chosen, the soft start delay time
t
SSDEL,
the over-current fault latch delay time
t
OCDEL
, and the delay
time
t
VccPG
from output voltage (V
O
) in regulation to Power Good are fixed and shown in equation (5), (6) and (7)
respectively.
*
CHG
I
*
DISCHG
I
6
10
*
60
1
*
'
SS
SS
SSDEL
C
V
C
t
(5)
6
10
.
*
*
61
25
.
*
'
SS
SS
OCDEL
C
V
C
t
(6)
6
10
*
60
)
75
*
'
O
SS
CHG
SS
I
VccPG
V
C
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
(12V)
START-UP
(5VUVL GATES
FAULT MODE)
NORMAL OPERATION
(VOUT CHANGES DUE TO
LOAD AND VID CHANGES)
HICCUP OVER-CURRENT
RE-START
AFTER OCP
CLEARS
POWER-DOWN
(VCC GATES
FAULT MODE)
UVLO
5VUVL
4.36V
SS/DEL
3.75V
PWRGD
VOUT
IOUT
1.1V
OCP
OCP THRESHOLD
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