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參數(shù)資料
| 型號： | AD5100YRQZ-RL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 電源管理 |
| 英文描述： | System-Management IC with Programmable Quad Voltage Monitoring and Supervisory Functions |
| 中文描述： | 4-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO16 |
| 封裝： | 0.025 INCH PITCH, ROHS COMPLIANT, MO-137AB, QSOP-16 |
| 文件頁數(shù)： | 20/32頁 |
| 文件大?。?/td> | 495K |
| 代理商： | AD5100YRQZ-RL7 |
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AD5100
Preliminary Technical Data
Poor PCB layout introduces parasitic inductance that may affect
the fuse programming voltage droop. Therefore, it is mandatory
that a 10μF tantalum capacitor be placed as close as possible to
the V
OTP
pin. The value and the type of C2 chosen are
important. It should provide both a fast response and larger
supply current handling with minimum supply droop during
programming, see Figure 18.
Rev. PrJ | Page 20 of 32
Protection
Over-Current Protection
If the V
1MON
is shorted internally in the AD5100 to GND, the
short-circuit protection kicks in and limits subsequent current
to 150mA in normal operation or 50mA when the V
OTP
is
executed.
Thermal Shutdown
When the AD5100 junction temperature is near the junction
temperature limit, it will automatically shutdown and cut out
the power from V
1MON
. The part will resume operational when
the device junction temperature returns to normal.
For automotive applications, proper external protections on the
AD5100 are needed in order to ensure reliable operation. The
V
1MON
will likely be used for battery monitoring. The V
2MON
will
likely be used for ignition switch or other critical inputs. As a
result, these inputs may need additional protections such as
EMI, loaddump, and ESD protections. In addition, battery input
also requires reverse battery protection and short circuit fuse
protection, see Figure 19.
ESD Protection
It is common to require a contact rating of ±8kV and a non-
contact or air rating of ±15kV ESD protection for the
automotive electronics. As a result, a ESD rated protection
device must be used such as MMBV27VCL, a dual 40W TVS
(Transient Voltage Suppressor) 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
the resulting long-duration, high-voltage surge introduced into
the supply line. As a result, external load dump protection is
recommended. Typically the load dump overvoltage lasts for
few hundreds millisecond and peaks at around 40V to 70V
while current can be as high as 1A. As a result, a load dump
rated TVS D1 and D2 such as SMCJ17 are used to handle the
surge energy. A series R is an in-line 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 drop
Reverse Battery Protection
Reverse battery protection can be provided by a regular diode if
the battery monitoring accuracy can be relaxed. Otherwise, a
60V P-Ch Power MOSFET, like NDT2955, can be used. Because
of the MOSFET internal diode, the battery will first conduct
through P1’s 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 will be negligible. The resistor divider values are chosen
such that the P1’s maximum V
GS
is not violated and the current
drawn through the battery is only a few μA.
EMI Protection
For EMI protection, ferrite bead or EMC rated inductor such as
DR331-7-103 can be used.
Figure 19. Protection Circuits
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