PI2061 Datasheet, PDF (12/16 Pages) Vicor Corporation – High Side High Voltage Load Disconnect Switch Controller IC

Not Recommended for New Designs

Typical Application Example 1:
12V Load Switch
Maximum Junction temperature
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 V_GS rating of +/-12V or higher.
Select an N-Channel MOSFET with a low R_DS(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.
VC Bias: Vin maximum input is 13.2V, this is higher than
the 11V VC minimum Clamp Voltage (V_VC-SGND) minimum,
but the minimum input voltage is greater than V_VC-SGND
minimum. Use 300 resistor for each R_VC and R_PG to
minimize regulator clamp current.
Power dissipation of R_VC and R_PG:
From Si4630DY datasheet:
 N-Channel MOSFET
 V_DS= 25V
 I_D = 32A continuous drain current
 I_D(Pulse) = 70A Pulsed drain current
 V_GS(MAX)=±16V
 R_θJA= 80°C/W under Steady State condition
 R_DS(on)=2.2m typical and 2.7m maximum at
I_D=20A, V_GS=10V, T_J=25°C
Select Sense Resistor:
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.
Rs power dissipation at maximum operating current
Maximum trip current
Power dissipation:
R_DS(on) is 2.7m maximum at 25°C & 10 V_GS 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) R_DS(on) will increase by 37%.
maximum at 115°C
Vin
300
VC
0.1µF
RTN
Si4630DY
5m
M1
RS
26
7
GATE SP
SN
3 _VC
PI2061
5 _EN
4 _SGND
PGND
1
300
Vout
D1 D2
Figure 15: PI2061 in 12V Bus high side load switch
application.
Picor Corporation • picorpower.com
PI2061
Rev 1.4
Page 12 of 16