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Select the resistor (R PG ) value at the minimum input
voltage to avoid a voltage drop that may reduce V VC-
SGND lower than VC under voltage lockout.
Select the value of R PG using the following equations:
R PG ?
V VC ? min ? V VC ? CLMMax
I VC _ Max ? 0 . 1 mA
R PG maximum power dissipation:
PdR PG ?
( V VC ? max ? V VC ? CLMMin ) 2
R PG
Figure 14: Constant current bias circuit
V VC ? min :
Where:
VC pin minimum applied voltage with
respect to Vin return
V VC ? max : VC pin maximum applied voltage with
respect to Vin return
V VC ? CLMMax : Controller maximum clamp voltage, 12.5V
V VC ? CLMMin : Controller minimum clamp voltage, 11.0V
I VC _ Max : Controller maximum bias current, use
Pulling the Q2 base (EN) to the system return (RTN)
will turn off the transistor and the controller returns
(SGND pin and PGND pin) will float and eventually
the MOSFET will be turned off. An open collector
device can be used to enable and disable the PI2007.
The constant current circuit should guarantee current
greater than the PI2007 maximum Quiescent current
(I VC ), 2.0mA.
R LIMIT can be calculated from the following equation:
2.0mA plus 0.1mA for margin
Example: 40V <V VC <50V
R LIMIT ?
V Z _ MIN ? V BE ( on )
I VC _ MAX
R PG ?
V VC min ? V VC ? CLMMax
I VC _ Max ? 0 . 1 mA
?
40 V ? 12.5 V
2 . 1 mA
? 13 . 1 k ?
Where:
V Z _ MIN : Minimum Zener diode voltage
? 50 V ? 11 V ? ? 116 mW
PdR PG
?
( V VC ? max ? V VC ? CLMMin ) 2
R PG
?
13 . 1 k ?
2
V BE ( on ) : Q2 Base-Emitter On maximum voltage, for
default use V BE ( on ) =0.7V
I VC _ MAX : PI2007 Quiescent Current, maximum
Alternative Bias Circuit with Device Enable:
Constant current circuit
In a wide operating input voltage range the size of R PG
may be become large to support power dissipation. A
simple constant current circuit can be used instead of
R PG to reduce power dissipation and can be used as a
device enable.
As shown in Figure 14, the constant current circuit
consists of an NPN transistor (Q2), Zener diode D Z ,
current limit resistor (R LIMIT ) and Zener bias resistor
(R Z ). R LIMIT and R Z can be very low power resistors
and Q2 is a signal transistor where its Collector-
Emitter Voltage (V CEO ) is equal or greater than the
input operating voltage and supports 2.5mA at the
operating input voltage.
I VC =2.0mA
Zener Diode Selection:
Select a Zener diode with a low reverse current
requirement to minimize R Z . Zener diodes with higher
break down voltage will have lower reverse current
and reduce Q2 collector current variation. Zener
diodes with a breakdown voltage of 6V and higher will
require low bias current and accurate voltage
breakdown.
R Z maximum value can be calculated with the
following equation:
Note that the surface mount resistors have limited
operating voltage capability. Be sure to pick a
resistor package that can meet the maximum
operating voltage (Vin).
Picor Corporation ? picorpower.com
PI2007
Rev 1.3
Page 10 of 19
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