参数资料
型号: ADM1041A-EVALZ
厂商: Analog Devices Inc
文件页数: 18/56页
文件大小: 0K
描述: BOARD EVAL FOR ADM1041A
标准包装: 1
主要目的: AC/DC,次级
输出及类型: 1,非隔离
功率 - 输出: 24W
输出电压: 12V
电流 - 输出: 2A
输入电压: 85 ~ 132VAC
板类型: 完全填充
已供物品: 板,线缆,软件
已用 IC / 零件: ADM1041A

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.
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 1
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.
INTERNAL
REFERENCE
2.5V
MAIN
BAND GAP
1.25V
EXTREFOK
REFERENCE
MONITOR
AUXILIARY
REFERENCE
INTREFOK
2.0V
4.0V
POR
UVLLO
S
RESET
4.4V
6.0V–6.5V
UVLHI
OVP
R
S
Q
Q
V DD OK
V DD OV
300 μ s ≥ 500 μ s ≥ 700 μ s
V S – 20
0.2V
GROUND
MONITOR
GNDOK
R
Q
GND 7
gndok_dis
Figure 8. Block Diagram of Power Management Section
Rev. 0 | Page 18 of 56
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