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Make sure that the PI2161 to turn on below the
minimum required voltage, use 27V for the minimum
voltage to calculate R PG .
I TRIP ?
?
V OC _ THL * ? 144 * R DS ( on ) ? 11 * ( Rs ? 17.5) ?
12 * Rs * R DS ( on )
R PG ?
? 6 . 136 K ? or 6.04 K Ω
( 48 V ? 11 V )
Pd RPG ? ? 227 mW
V
27 V ? 12 .5 V ? 1 V
2 . 1 mA ? 100 ? A
2
6 . 04 K ?
Sense resistor Maximum power dissipation is:
2
Pd RS ? TH ? MAX
Rs
Where:
Rs : Current sense resistor [ mΩ ]
I TRIP :
Current trip point [ A ]
Enable Input: ( EN )
This input provides control of the switch state enabling
and disabling with logic level signals.
Current Sense Resistor Selection: Rs
The Rs value can be selected from Figure 4 to set the
V OC _ THL :
V TH ? MAX :
Low Range Overcurrent Threshold [ mV ],
63mV minimum
Maximum Overcurrent Threshold [ mV ],
77mV
?
?
R DS ( on ) ( 100 ) ? 11 m ? * 0 . 873 * e 3 . 75 * 100 * 10 ? 0 . 041
? ?
R DS ( on ) ( T J ) ? R DS ( on ) ( 25 ? C ) * 0 . 873 * e 3 . 75 * T J * 10 ? 0 . 041
63 * ? 144 * 14 . 42 ? 192 . 5 ?
nominal trip current at junction temperature for internal
MOSFET of 25°C or 125°C. To set the minimum trip
current at specific junction temperature use the
following procedure.
The current trip point is a function of the Low Range
Overcurrent Threshold (V OC-THL ), the internal MOSFET
on resistance (R DS(on) ) and current sense resistor (Rs).
To insure that PI2161 will not trip within the expected
nominal operating current range, include the variation
of V OC-THL and R DS(on) in the calculation when selecting
Rs. V OC-THL is 70mV typical, 63mV minimum and
77mV maximum. The R DS(on) typical value at 25°C is
8.5mΩ and 11mΩ maximum. R DS(on) will increase with
temperature as shown in Figure 12, and can be
calculated by multiplying the R DS(on) value at 25°C by
the normalized factor in Figure 12 at the expected
operating junction temperature or use the following
equation.
? 3
Current trip calculation example:
Minimum current tripping point = 12A
Maximum MOSEFET junction temperature = 100°C.
The lowest tripping current will occur at the internal
MOSFET maximum R DS(on) and its maximum junction
temperature, and minimum Low Range Overcurrent
Threshold (V OC-THL ).
The MOSET maximum R DS(on) is 11mΩ at 25°C and at
maximum junction temperature will be
? 3
R DS ( on ) ( 100 ) ? 14 . 42 m ?
Select Rs at minimum V OC-THL =63mV
Rs ? ? 103 . 32 m ?
12 * 12 * 14 . 42 ? 11 * 63
Rs maximum power dissipation:
Where:
T J :
Internal MOSFET Junction temperature
Pd RS ?
V TH ? MAX
Rs
2
?
0 . 077 2
0 . 103
? 57 . 6 mW
V OC _ THL * ? 144 * R DS ( on ) ? 192 . 5 ?
63 * ? 144 * 14 . 42 ? 11 * ( 100 ? 17 . 5 ) ?
R DS ( on ) ( T J ) : Internal MOSFET R DS(on) at T J in °C
R DS ( on ) ( 25 ? C ) : Internal MOSFET R DS(on) at T J = 25°C
The sense resistor can be calculated from the
following equation as a function of the trip current:
Rs ?
12 * I TRIP * R DS ( on ) ? 11 * V OC _ THL
And the trip current can be calculated from the
following equation:
This is a low power dissipation resistor and any
package size work as far by selecting the nearest
standard value. The closest resistor available value in
1% accuracy in an 0603 or 0805 package is 0.10 Ω
(10 0mΩ ).
If 0603 0.10 Ω 1% resistor selected, then the minimum
trip current is:
I TRIP ? ? 12 . 26 A
12 * 100 * 14 . 42
Picor Corporation ? pi corpower.com
PI2161
Rev 1.1 , Page 12 of 18
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