參數(shù)資料
型號(hào): ADM1041AARQZ-REEL7
廠商: ANALOG DEVICES INC
元件分類: 通信及網(wǎng)絡(luò)
英文描述: Secondary-Side Controller with Current Share and Housekeeping
中文描述: SPECIALTY TELECOM CIRCUIT, PDSO24
封裝: LEAD FREE, MO-137AE, QSOP-24
文件頁(yè)數(shù): 23/56頁(yè)
文件大小: 991K
代理商: ADM1041AARQZ-REEL7
ADM1041A
SHARE_OK DETECTOR
Incorrect current sharing is a useful early indicator that there is
some sort of noncatastrophic problem with one of the power
supplies in a parallel system. Two comparators are used to
detect an excessive positive or negative error voltage at the input
Rev. 0 | Page 23 of 56
of the I
SHARE
error amplifier, which indicates that the current
share loop has lost control. One of four possible error levels
must be configured via the SMBus. See Figure 15.
24
20
23
22
5
SHAREOK
50mV
50mV
TO VOLTAGE ERROR AMP
I
SHARE
ERROR
DIFFERENTIAL
SENSE
60
μ
A
I
SHARE
DRIVE
+12V
1N4148
I
CLAMP
GAIN = (R1+R2)/R2
SCMP
GAIN = (R1 + R2)/R2
SHARE BUS
REMOTE
–VE SENSE
R1
R2
SHRO
SHRS+
V
S
–/SHRS–
V
CMP
0
VOLTAGE
ERROR AMP
SOFT-
START
RAMP UP
V
REF
DIFF. VOLTAGE SENSE
CURRENT SHARE
CAPTURE
CURRENT LIMIT
1V
3V
70
μ
A
V
REF
V
REF
V
DD
SET CURRENT-
LIMIT LEVEL
CURRENT-
SHARE
OFFSET
(V
,
IOUT = 0)
CURRENT-
ERROR AMP
FROM
CURRENT
SENSE
R
9R
Figure 15. Current-Share Circuit and Soft Start
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