© Semiconductor Components Industries, LLC, 2006
February, 2006 − Rev. 0 1Publication Order Number:
AND8259/D
AND8259/D
NIS5112 Hot Plug
Evaluation Board Manual
Prepared by: Alan Ball and Alex Lara
ON Semiconductor
General Description
The NIS5112 Demo board is a simple circuit which biases
the NIS5112 device so that its functionality can easily be
observed. It contains an input capacitor of 1 mF and output
capacitor of 100 mF, as well as a bleeding load resistor of
2 kW. It also contains a low power resistor of 56 W to set the
current limit (ILimit) as well as the capacitors for the timer
and dV/dt functions. The value of the timer capacitor is
100 nF and the dV/dt is 1 mF. These two capacitors are
optional and their function is explained in the NIS5112
datasheet. The demo board defaults are for a 9.0 V turn on
point and a 15 V overvoltage clamp. The current limit circuit
is set for 2.5 amp limit (56 W). Input power and loads can
easily be connected via banana jacks mounted on the board.
Features
•Integrated Power FET
•Power FET Thermally Protected
•No External Current Shunt Required
•Enable/Timer Pin
•Adjustable Slew Rate for Output Voltage
•Internal Charge Pump
•30 mW Typical
•9 to 15 Volt Input Range
•Overvoltage Clamp
Current Limit
The current limit circuit has a 56 W resistor installed
which will allow a maximum current of 2.5 amps before
invoking the current limit circuit. To change the current limit
circuit, select the corresponding resistance value for the
desired peak current setting from the chart in Figure 2.
NIS5112
Gnd dV/dt
Source
NUD3124
Enable
Enable
Control
1 mF, 50 V
+12 V
Gnd
Load
Gnd
Figure 1. Evaluation Board Schematic
1 mF, 16 V
0.1 mF,
12 V
100 mF,
50 V
2 kW,
1 Watt
56 W,
1/8 Watt
ILimit
VCC
Enable/
Timer
APPLICATION NOTE
http://onsemi.com
AND8259/D
http://onsemi.com
2
Figure 2. Current Limit Adjustment
100
10
1
010 100 1000
RextILimit (W)
ILimit (A)
ILIMIT_SS
ILIMIT_OL
NOTE: For additional information about device’s operation and parameters, please refer to the device’s datasheet
(NIS5112) at ON Semi’s web site.
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“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
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AND8259/D
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