PI2125 datasheet(17/20 Pages) VICOR

17 / 20 page

Transistor circuit which is available as a small device

that contains two transistors and their bias resistors.

Recalculate TJ:

⎟

⎠

⎞

⎜

⎝

⎛

∗

121

)

(

UV and OV inputs:

In floating applications these

pins can not be used to monitor Vin. Connect UV to

the VC pin and OV to the GND pin to disable their

function.

Maximum power dissipation at 121°C:

Rds

Iin

945

)

(

)

(

max

∗

Power Dissipation and Junction Temperature:

First use Figure 13 (Junction Temperature vs. Input

Current) to find the final junction temperature at 10A

load current and 70°C ambient temperature. In

Figure 13 (illustrated in Figure 22) draw a vertical

line from 10A to intersect the TA=70°C line. At the

10A and TA=70°C line intersection draw a horizontal

line towards the Y-axis (Junction Temperature). The

Junction Temperature at full load current (10A) and

70°C ambient is 120°C.

Rds(on) is 7.0mΩ maximum at 25°C and will

increase as the Junction temperature increases.

From Figure 11, at 120°C Rds(on) will increase by

~35%, then

Figure 23

: PI2125, 12V floating Active ORing

application

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 room temperature (25°C) typical Rds(on):

Figure 22:

Example 1 final junction temperature at

10A/70°C TA

Rds

reverse

Vth

reverse

)

(

−

•

Rds

)

(

maximum at 120°C

At maximum junction temperature (121°C) and

maximum Rds(on):

Rth : 54°C/W

Rds

reverse

Vth

reverse

635

)

(

−

)

(

Rds

Rth

∗

Picor Corporation • picorpower.com

PI2125

Rev 1.0

Page 17 of 20

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