PI2061 datasheet(12/16 Pages) VICOR

12 / 16 page



Picor Corporation • picorpower.com

PI2061

Rev 1.4

Page 12 of 16

Typical Application Example 1:

12V Load Switch

Requirement:

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

Maximum Load Current = 10A

Minimum Trip current = 12A

Maximum Ambient Temperature = 75°C

Solution:

PI2061 with a suitable external MOSFET should be used,

configured as shown in the circuit schematic in .

Select a suitable N-Channel MOSFET:

Most industry

standard MOSFETs have a VGS rating of +/-12V or higher.

Select an N-Channel MOSFET with a low RDS(on) which is

capable of supporting the full load current with some

margin, so a MOSFET capable of at least 18A in steady

state is reasonable. An exemplary MOSFET having these

characteristic is the Si4630DY from Siliconix.

From Si4630DY datasheet:



N-Channel MOSFET



VDS= 25V



ID = 32A continuous drain current



ID(Pulse) = 70A Pulsed drain current



VGS(MAX)=±16V



RθJA= 80°C/W under Steady State condition



RDS(on)=2.2m

typical and 2.7m

maximum at

ID=20A, VGS=10V, TJ=25°C

Select Sense Resistor:

Rs power dissipation at maximum operating current

Maximum trip current

Power dissipation:

RDS(on) is 2.7m

maximum at 25°C & 10 VGS and will

increase as the temperature increases.

Add 40°C to

maximum ambient temperature to compensate for the

temperature rise due to power dissipation. At 115°C (75°C

+ 40°C) RDS(on) will increase by 37%.

maximum at 115°C

Maximum Junction temperature

VC Bias: Vin maximum input is 13.2V, this is higher than

the 11V VC minimum Clamp Voltage (VVC-SGND) minimum,

but the minimum input voltage is greater than VVC-SGND

minimum.

Use 300

resistor for each RVC and RPG to

minimize regulator clamp current.

Power dissipation of RVC and RPG:

Both resistors have very low power dissipation, less than

50mW. Any package size resistor, 0201 (0603 metric) or

larger, can be used.

EN:

Tie EN pin to VC since Enable function is always on.

FT:

Fault function is not required, leave fault pin unconnected.

Figure 15: PI2061 in 12V Bus high side load switch

application.

Vin

PGND

GATE

SGND

PI2061

0.1µF

RTN

300

Vout

300

Si4630DY

Not Recommended for New Designs

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