PI2061 datasheet(13/16 Pages) VICOR

13 / 16 page

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Picor Corporation • picorpower.com

PI2061

Rev 1.4

Page 13 of 16

Typical application Example 2:

Requirement:

+48V Load Switch with Enable Function

Bus Voltage = +48V (+36V to +55V)

Maximum Load Current = 5A

Minimum Trip current = 6A

Maximum Ambient Temperature = 60°C

Solution:

PI2061 with a suitable MOSFET should be used and

configured as shown in Figure 16.

Select a suitable N-Channel MOSFET: Select a MOSFET

with voltage rating higher than the input voltage, Vin, plus

any expected transient voltages, with a low RDS(on) that is

capable of supporting the full load current with margin. For

instance, a 100V rated MOSFET with 10A current capability

is suitable. An exemplary MOSFET having these

characteristic is IRF7853PbF from International Rectifier.

From the IRF7853PbF datasheet:

N-Channel MOSFET

VDS= 100V

ID = 8.3A maximum continuous drain current at 25°C

ID-PULSE = 66A pulsed drain current

VGS(MAX) =±20V

RθJA= 50°C/W on 1in

2 copper, t ≤ 10seconds

RθJA for continuous operation not provided

RDS(on)=14.4m typical at VGS=10V, TJ=25°C

RDS(on)=18m maximum at VGS=10V, TJ=25°C

Select Sense Resistor:

Rs power dissipation at maximum operating current

Maximum trip current

Power dissipation:

RDS(on) is 18m maximum at 25°C & 10 VGS and will increase

as the temperature increases.

Add 20°C to maximum

ambient temperature to compensate for the temperature

rise due to power dissipation. At 80°C (60°C + 20°C) RDS(on)

will increase by 40%.

at maximum at 80°C

Maximum Junction temperature

Recalculate maximum RDS(on) at 95°C.

At 95°C RDS(on) will increase by 50%:

at maximum at 95°C

Maximum Junction temperature after 10s

For continuous operation refer the MOSFET datasheet for

RθJA under continuous operation and use in place of

50°C/W.

VC Bias Resistors:

Select 7.5k resistor

Select 10k resistor

Power dissipation of RVC and RPG:

Recommended Schottky: PMEG4005EJ from NXP or

equivalent

Not Recommended for New Designs

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