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零件编号 NIS5132
描述 3.6A 12V RESETTABLE ELECTRONIC FUSE
制造商 Diodes
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NIS5132 数据手册, 描述, 功能
NIS5132
Green 3.6A 12V RESETTABLE ELECTRONIC FUSE
Description
The NIS5132 is a self-protected resettable electronic fuse designed
for consumer applications such as hard disk drives, to industrial
applications to enhance system reliability against catastrophic and
shutdown failures.
To support a wide range of demanding applications, the design has
been optimized to operate over the supply range of 9.0V to 18V. For
robustness and protections, the device integrates a low Rdson
NMOS buffer power device along with an undervoltage lockout,
overvoltage clamp, a current limit, a dv/dt control and a thermal
shutdown circuits. The overvoltage circuit limits the output voltage
without shutting the device down to allow the load to continue
operating during over voltage. Thermal shutdown can be either
latching type (NIS5132MN1) or auto-retry type (NIS5132MN2).
Pin Assignments
( Top View )
GND 1
dv/dt 22
Enable/Fault 3
ILIMIT 4
NC 5
NIS5132MN1
NIS5132MN2
10 Source
29 Source
8 Source
7 Source
6 Source
U-DFN3030-10
Features
Applications
9.0 to 18V Operating Input Voltage
Integrated NMOS Power Device with RDS(ON) of 30mΩ Typical
Internal Current Limit - No External Current Sense Resistor in
Hard Drives
Mother Board Power Management
Printer Load Power Management
Load Path
Under Voltage Lockout
Over Voltage Clamp (NIS5132MN1 and NIS5132MN2)
Thermal Shutdown
-40C to +150C Operating Junction Temperature
ESD Ratings : HBM 1500V; MM 200V
Small Low Profile U-DFN3030-10 package
UL Recognized, Report E322375-20140529
Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free,
"Green” and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and <1000ppm antimony compounds.
Typical Application Circuits
+12V
11 VDD
SOURCE
10
9
+
10µF
NIS5132
8
7
6
ENABLE
3 ENABLE
ILIMIT 4
GND
1
dv/dt
2
Cdv/dt
+
RS 100µF Load
Figure 1 Application Circuit with Direct Current Sensing
NIS5132
Document number: DS36457 Rev. 4 - 2
1 of 12
www.diodes.com
May 2016
© Diodes Incorporated







NIS5132 pdf, 数据表
NIS5132
Application Note
Theory of Operation
The NIS5132 is a self-protected, resettable electronic fuse. It monitors the input and output voltage, the output current and the die temperature.
When the NIS5132 is powered up it will ramp up the output voltage based on the dv/dt setting (see description below) and current will begin to flow.
The device current limit can be set with an external resistor, the ramp rate (dv/dt) can be adjusted with an external capacitor. The Overvoltage
Clamp, Undervoltage Lockout and Thermal Protection are internally set.
Power Supply Considerations
Placing a high-value electrolytic capacitor or X7R (X5R) ceramic capacitor between VDD to GND (10F) and SOURCE to GND (100F) as close
to the device as possible is highly recommended. This precaution reduces power-supply transients that may cause ringing on the input and load
transients that may cause output voltage falls below input voltage resulting device over-heat.
Current Limit
The NIS5132 incorporates a sensefet with a reference and amplifier to control the current in the device. The sensefet uses a small fraction of the
load current to measure the actual current. This reduces the losses as a smaller sense resistor can be used. The current can be measured direct
with the Rs resistor connected between the load and the Isense pin (see Figure 1). That method includes the resistance of the bond wires in the
current limiting circuit. Or a Kelvin connection (see Figure 2) can be used, in that case one of the 5 source pins will be used and the voltage is
measured on the die eliminating the bond wire resistance. That reduces the source pins to the load to four and with that increases the on
resistance of the effuse to the load.
Overvoltage Clamp
The NIS5132MN1 and NIS5132MN2 monitor the input voltage and clamp it once it exceeds 15V. This will allow for transient on the input for short
periods of time. If the input voltage stays above 15V for extended times the voltage drop across the FET with the load current will increase the die
temperature and the thermal shutdown feature will protect the device and shut it down.
Undervoltage Lock Out
The input voltage of the NIS5132 is monitored by an UVLO circuit (undervoltage lockout) if the input voltage drops below this threshold the output
transistor will be pulled into a high impedance state.
dv/dt
The NIS5132 has an integrated control circuit that forces a linear ramp on the output voltage raise regardless of the load impedance. Without
connecting a capacitor on the dv/dt pin the ramp time is roughly 2ms. Adding an external capacitor can increase this ramp rate. The internal
current source of 90µA will charge the external capacitor at a slow rate. It is recommended to utilize a ceramic capacitor.
The ramp time can be determined with the following equation
Cext in Farad
tramp in seconds
The ramp up circuit is discharged and VOUT starts from 0V when the units shuts down after a fault, enable shutdown or input power cycle.
Enable/Fault
The NIS5132 has a tri state Enable/Fault pin. It is used to turn on and off the device with high and low signals from a GPIO, but can also indicate a
thermal fault. When the Enable/Fault pin is pulled low the output is turned off, when the Enable/Fault pin is pulled high the output is turned on. In
the event of a thermal fault the Enable/Fault pin will be pulled low to an intermediate voltage by an internal circuit. This can be used to chain up to
4 NIS5132 together that during a thermal shut down the linked devices turn off as well.
Due to this fault indication capability it should not be connected to any type of logic with an internal pull up device.
The NIS5132MN1 connected to a 2nd device will latch-off until the Enable/Fault pin has been pulled to low and then allowed to go back up to a high
signal, or if the power has been cycled. Once the part starts up again it will go through the startup ramp determined by the internal circuit or based
on the externally connected capacitor on pin dv/dt.
The MN2 devices will auto restart once the part that indicated a thermal shutdown has cooled down. It will also go through the startup ramp.
NIS5132
Document number: DS36457 Rev. 4 - 2
8 of 12
www.diodes.com
May 2016
© Diodes Incorporated














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