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| 型号： | EVAL-AD5100EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 22/36页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD5100 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电源监控器/跟踪器/序列发生器 |
| 已用 IC / 零件： | AD5100 |
| 主要属性： | 电压检测器和监控器 |
| 次要属性： | 开漏极输出 |
| 已供物品： | 板 |
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AD5100
PROTECTION
For automotive applications, proper external protections on the
AD5100 are needed to ensure reliable operation. The V 1MON is
likely to be used for battery monitoring. The V 2MON is likely to
be used for ignition switch or other critical inputs. As a result,
these inputs may need additional protections such as EMI, load
dump, and ESD protections. In addition, battery input requires
reverse battery protection and short-circuit fuse protection (see
Figure 19).
Overcurrent Protection
If the V 1MON is shorted internally in the AD5100 to GND, the
short-circuit protection kicks in and limits subsequent current
to 150 mA in normal operation.
Thermal Shutdown
When the AD5100 junction temperature is near the junction
temperature limit, it automatically shuts down and cuts out the
power from V 1MON . The part resumes operation when the device
junction temperature returns to normal.
ESD Protection
It is common to require a contact rating of ±8 kV and a no
contact or air rating of ±15 kV ESD protection for the
automotive electronics. As a result, an ESD-rated protection
device must be used, such as MMBZ27VCL, a dual 40 W
transient voltage suppressor (TVS) at the V 1MON and V 2MON .
Load Dump Protection
A load dump is a severe overvoltage surge that occurs when the
car battery is being disconnected from a spinning alternator and
a resulting long duration, high voltage surge is introduced into
the supply line. Therefore, external load dump protection is
recommended. Typically, the load dump overvoltage lasts for a
few hundred milliseconds and peaks at around 40 V to 70 V,
while current can be as high as 1 A. As a result, a load dump-
rated TVS D1 and D2, such as SMCJ17, are used to handle the
surge energy. A series resistor is an inline current limiting
resistor; it should be adequate to limit the current without
significant drop and yet small enough to not affect the input
monitoring accuracy.
Reverse Battery Protection
Reverse battery protection can be provided by a regular diode
if the battery monitoring accuracy can be relaxed. Otherwise,
a 60 V P-channel power MOSFET, like the NDT2955, can be
used. Because of the MOSFET internal diode, the battery first
conducts through the P1 body diode as soon as the voltage reaches
its source terminal. The voltage divider provides adequate gate-
to-source voltage to turn on P1, and the voltage drop across the
FET is negligible. The resistor divider values are chosen such
that the maximum V GS of the P1 is not violated and the current
drawn through the battery is only a few microamps.
EMI Protection
For EMI protection, a ferrite bead or EMC rated inductor, such
as DR331-7-103, can be used.
V REG
NDT2955
EN
VREF
L1
10μH
R3
2.2 ?
C1
0.1μF
DR331-7-103
P1
C3
10μF
R1
2M ?
D1
V 1MON
B+
F1
L1
R2
1.5M ?
SMCJ17
DIGIPOT
–
VMAIN
+
IGNITION SWITCH
R4
2.2 ?
V 2MON
AD5100
C2
0.1μF
D2
D3
D4
DIGIPOT
SMCJ17
Figure 19. Protection Circuits
Rev. A | Page 22 of 36
MMBZ27VCL
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