PI2061 Datasheet, PDF (14/16 Pages) Vicor Corporation – High Side High Voltage Load Disconnect Switch Controller IC

Not Recommended for New Designs

Enable Input Circuit: EN
Pull EN pin to ground (return) to disable. This can be
accomplished with a signal transistor (Q1) in open
collector configuration and a pull-up resistor R_EN.
A 5% 360k resistor can be used to pull down on EN pin.
Note that the control signal phase is inverted.
Vin
7.5K
VC
REN
360K
0.1µF
EN
RTN
IRF7853PbF
10m
M1
RS
26
7
GATE SP SN
3 _VC
5 _EN
PI2061
FT
4 _SGND
PGND
1
10K
Vout
D1 D2
Figure 16: PI2061 in high side +48V application, VC is
biased through a bias resistor
Layout Recommendation:
Use the following general guidelines when designing
printed circuit boards. An example of the typical land
pattern for the PI2061 is shown in Figure 17.
 Use a solid ground (return) plane to reduce circuit
parasitics.
 Connect Rs terminal at SP pin side, D1 cathode and all
MOSFET source pins together with a wide trace to
reduce trace parasitics and to accommodate the high
current output. Connect Rs terminal at SN pin side to
the load with a wide trace. Also connect all MOSFET
drain pins together with a wide trace to accommodate
the high current input
 Kelvin connect SP pin and SN pin to Rs terminals.
 The VC bypass capacitor should be located as close as
possible to the VC and SGND pins. Place the PI2061
and VC bypass capacitor on the same layer of the
board. The VC pin and C_VC PCB trace should not
contain any vias.
 Dedicate a small copper area on lower layer
underneath the controller for PGND and SGND to
make a single point connection and simplify layout
inter connect. Make sure that Vin to Vout current
return path is solid underneath the MOSFET (M1) and
the sense resistor (R1).
 Make sure D1 and D2 connecting traces are very short
to reduce parasitic inductance that might produce
voltage drop due MOSFET fast turn off.
 Use 1oz of copper or thicker if possible to reduce trace
resistance and power dissipation.
Figure 17: PI2061 layout recommendation
Picor Corporation • picorpower.com
PI2061
Rev 1.4
Page 14 of 16