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參數資料
| 型號： | ADM1041AARQZ-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 通信及網絡 |
| 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 |
| 文件頁數： | 18/56頁 |
| 文件大小： | 991K |
| 代理商： | ADM1041AARQZ-REEL |
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ADM1041A
THEORY OF OPERATION
POWER MANAGEMENT
This block contains V
DD
undervoltage lockout circuitry and a
power-on/reset function. It also provides precision references
for internal use and a buffered reference voltage, V
REF
. Over-
loading, shorting to ground, or shorting to VDD do not effect
the internal references. See Figure 8.
Rev. 0 | Page 18 of 56
During power-on, V
REF
does not come up until V
DD
exceeds the
upper UVL threshold. Housekeeping components in this block
include reference voltage monitors, a V
DD
overvoltage monitor,
and a ground fault detector.
The ground fault detector monitors ADM1041A ground with
respect to the remote sense pin V
S
. If GND becomes positive
with respect to V
S
, an on-chip signal, V
DD
OK, goes false.
V
DD
OK is true only when all the following conditions are met:
ground is negative with respect to VS, INTREF and EXTREF
are operating normally, V
DD
> UVLHI, and V
DD
< V
DD
OVP
threshold.
GAIN TRIMMING AND CONFIGURATION
The various gain settings and configurations throughout the
ADM1041A are digitally set up via the SMBus after it has been
loaded onto its printed circuit board. There is no need for
external trim potentiometers. An initial adjustment process
should be carried out in a test system. Other adjustments such
as current sense and voltage calibration should be carried out in
the completed power supply.
POR
RESET
V
DD
OK
V
DD
OV
1.25V
2.5V
UVLLO
UVLHI
OVP
GNDOK
GROUND
MONITOR
300
μ
s
≥
500
μ
s
≥
700
μ
s
6.0V–6.5V
4.4V
4.0V
2.0V
V
DD
V
S
–
GND
0.2V
AUXILIARY
REFERENCE
EXTREFOK
REFERENCE
MONITOR
INTREFOK
INTERNAL
REFERENCE
gndok_dis
MAIN
BAND GAP
7
20
1
S
Q
R
Q
S
R
Q
0
Figure 8. Block Diagram of Power Management Section
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| ADM1041ARQ-2 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| ADM1041ARQ-REEL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Secondary-Side Controller with Current Share and Housekeeping |
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