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Typical Application Example:
Requirement:
Redundant Bus Voltage = 40V ±5V
Maximum Load Current = 9A (assume through each
redundant path)
Maximum Ambient Temperature = 60°C, no air flow
(0LFM)
The current flow parasitic inductance for each ORing
R DS ( on ) = 11 m Ω ? 1 . 38 = 15 . 18 m Ω maximum at 115°C
Maximum power dissipation is:
Pd max = Iin 2 ? R DS ( on ) = ( 9 A ) 2 ? 15 . 18 m Ω = 1 . 23 W
Recalculate T J :
T J max = 60 ° C + ?
? ( 9 A ) 2 ? 15 . 18 m Ω ? = 115 . 3 ° C
device is 60nH.
Solution:
A single PI2127 for each redundant 40V power source
should be used, configured as shown in the circuit
schematic in Figure 23.
R PG selection:
35V <V S-PG <45V
? 45 ° C
? W
?
?
R PG =
V S min ? V S ? PGMax
IC max + 0 . 1 mA
=
35 V ? 12 . 5 V
2 . 1 mA
= 10 . 71 k Ω
The closest 1% resistor available is 10.5k ?
PdR PG
=
( V S ? max ? V S ? PGMin ) 2
R PG
=
( 45 V ? 11 V ) 2 = 110 mW
10 . 5 k Ω
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.
FT pin:
Connect FT pin to the logic input and to the logic
power supply via a resistor, as required for the proper
input level of the supervisor functions.
Power Dissipation and Junction Temperature:
First use Figure 13 (Junction Temperature vs. Input
Figure 22: Example 1 final MOSFET junction
temperature at 9A/60°C T A
Reverse Current Threshold:
The following procedure demonstrates how to
calculate the minimum required reverse current in the
internal MOSFET to generate a reverse fault condition
and turn off the internal MOSFET.
At maximum junction temperature (115°C) and
maximum R DS(on) :
Current) to find the final junction temperature for 9A
load current at 60°C ambient temperature. In Figure
13 (illustrated in Figure 22) draw a vertical line from
9A to intersect the 60°C ambient temperature line. At
Is . reverse =
V RVS ? TH
R DS ( on )
=
? 6 mV
15 . 18 m Ω
= ? 395 mA
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.
Peak current under input short is:
At typical response time:
R DS(on) is 11m ? maximum at 25°C and will increase as
the Junction temperature increases. From Figure 11,
at 115°C R DS(on) will increase by 38%, then
I PEAK =
V S * t RVS
L PARASITIC
=
45 V * 80 ns
60 nH
= 60 A
Picor Corporation ? picorpower.com
PI2127
Rev 1.3
Page 14 of 19
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