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Typical Application Example:
Load Disconnect Switch
Requirement:
Bus Voltage = 45V ±5V
Maximum Load Operating Current = 9A
Minimum Trip Current = 10A
Maximum Ambient Temperature = 60°C, no air flow
(0LFM)
The current flow parasitic inductance is 60nH.
System logic voltage is 3.3V and logic high = 2.0V
Solution:
In this application, PI2161 is used to protect the power
source from load failure, configured as shown in the
circuit schematic in Figure 21.
Power Dissipation and Junction Temperature:
First use Figure 14 (MOSFET Junction Temperature
vs. Input Current) to find the final junction temperature
for 9A load current at 60°C ambient temperature. In
Figure 14 (illustrated in Figure 20) draw a vertical line
from 9A to intersect the 60°C ambient temperature
line. At the intersection draw a horizontal line towards
the Y-axis (Junction Temperature). The Junction
Temperature at maximum load current (9A) and 60°C
ambient is 115°C.
R DS(on) is 11mΩ maximum at 25°C and will increase as
the Junction temperature increases. From Figure 12,
at 115°C R DS(on) will increase by 38%, then
R DS ( on ) ? 11 m ? ? 1 . 38 ? 15 . 18 m ? maximum at 115°C
Maximum power dissipation is:
R PG Selection:
For a margin purpose, select R PG to operate at input
voltage below the required operating voltage, use 27V
Pd max ? Iin 2 ? R DS ( on ) ? ( 9 A ) 2 ? 15 . 18 m ? ? 1 . 23 W
R PG ?
T J max ? 60 ? C ? ?
? ( 9 A ) 2 ? 15 . 18 m ? ? ? 115 . 3 ? C
minimum operating voltage:
V VD ? UVLO min ? VC clampMAX ? V DBST ? MAX
I VCMAX ? 100 ? A
Recalculate T J :
? 45 ? C
? W
?
?
R PG
?
27 V ? 12 .5 V ? 1 V
2 . 1 mA ? 0 . 1 mA
? 6 . 136 k ?
The closest 1% resistor available is 6.04 kΩ, R PG
power dissipation will be:
PdR PG ?
( V S ? max ? V S ? PGMin ) 2
R PG
?
? 50 V ? 11 V ? 2 ? 252 mW
6 . 04 k ?
The selected resistor should be capable of supporting
the total power at maximum operating temperature,
60°C. An 0805 (2012) will support the power
requirement.
VO pin:
In this application use the minimum voltage output
V SH = 40V, and for VO use the logic high voltage
(2.0V) with margin, VO = 2.1V
Figure 20: Example 1 final MOSFET junction
temperature at 9A/60°C T A
R VO ? 150 K ? *
2 . 1 V
40 V ? 2 . 1 V
? 8 . 3 K ?
Select Rs:
The minimum trip current will occur at maximum
Closest 1% resistor is 8.45 kΩ to the high side
Calculate VO at V SH = 40V and R VO =8.45 kΩ
MOSFET junction temperature and V OC-THL = 63mV:
VO ? V SH *
R VO
150 K ? ? R VO
VO ? 40 V *
8 . 45 K ?
150 K ? ? 8 . 45 K ?
? 2 . 133
Picor Corporation ? pi corpower.com
PI2161
Rev 1.1 , Page 14 of 18
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