PI2126 datasheet(12/15 Pages) VICOR

12 / 15 page

Picor Corporation • picorpower.com

PI2126

Rev 1.1

Page 12 of 15

Typical application Example:

Requirement:

Redundant Bus Voltage = 12V (±10%, 10.8V to 13.2V)

Load Current = 10A (assume through each redundant path)

Maximum Ambient Temperature = 60°C

Solution:

A single PI2126 for each redundant 12V power source

should be used, configured as shown in the circuit

schematic in Figure 18. PG pin is connected to ground and

VR pin is connected to Vin,

Figure 18: PI2126 in 12V redundant bus voltage application

The fault pin (

) can be pulled to the system logic level

voltage via a resistor (10kΩ), or it can be connected to the

input voltage (Vin) via a 25kΩ resistor.

Power Dissipation and Junction Temperature:

First use Figure 13 (Junction Temperature vs. Input

Current) to find the final junction temperature for 10A load

current at 60°C ambient temperature. In Figure 13

(illustrated in Figure 19) draw a vertical line from 10A 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 (10A) and 60°C ambient is 95°C.

Figure 19: Example 1 final junction temperature at 10A/60°C

RDS(on) is 6mΩ maximum at 25°C and will increase as the

Junction temperature increases. From Figure 10, at 95°C

RDS(on) will increase by 26%, then

maximum at 95°C

Maximum power dissipation is:

Recalculate TJ:

PI2126

Vin1

Vin2

PI2126

10, 11

2-5 & 18-21

1,15-17 & 22-25

2-5 & 18-21

1,15-17 & 22-25

10 11

100

110

120

130

140

150

Input Current [A]

TA = 100°C

TA = 90°C

TA = 80°C

TA = 70°C

TA = 60°C

TA = 50°C

RDS(on)=6.0mΩ @ 25°C

RθJA = 46°C/W

Air Flow = 0LFM

EOL

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