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V S ? PGMin : Controller minimum clamp voltage, 11V
I VC max : Controller maximum bias current, use
R LIMIT =
V Z _ MIN ? V BE ( on )
I VC _ MAX
V S min ? V S ? PGMax 40 V ? 12 . 5 V
IC max + 0 . 1 mA
R PG = = = 13 . 1 k Ω
( 50 V ? 11 V ) 2 = 116 mW
( V S ? max ? V S ? PGMin ) 2
PdR PG = =
R Z =
2.0mA
0 . 1 mA : 0.1mA is added for margin
Example: 40V <V S-PG <50V
2 . 1 mA
R PG 13 . 1 k Ω
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 20, the constant current circuit
consists of an NPN transistor (Q1), 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 Q1 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.
Where:
V Z _ MIN : Minimum Zener diode voltage
V BE ( on ) : Q1 Base-Emitter On maximum voltage, for
default use V BE ( on ) =0.7V
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 Q1 collector current variation. Zener
diodes with a breakdown voltage of 6V and higher will
require low bias current for 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).
V in _ MIN ? V Z _ MAX
I Z + I B _ MAX
Where:
V in _ MIN : Min input voltage
V Z _ MAX : Zener diode maximum breakdown voltage
I Z : Zener diode required reverse current
I B _ MAX : Q1 required maximum base current which
calculated from the following equation:
I B _ MAX =
I C _ MAX
h FE _ MIN
Figure 20: Constant current bias circuit
Pulling the Q1 base (EN) to the system return (RTN)
will turn off the transistor and the controller return (PG
pin) will float and eventually the MOSFET will be
turned off. An open collector device can be used to
enable and disable the PI2127.
The constant current circuit should guarantee current
greater than the PI2127 maximum Quiescent current
(I VC ), 2.0mA.
R LIMIT can be calculated from the following equation:
I C _ MAX : Q1 maximum expected collector current.
h FE _ MIN : Q1 minimum gain.
Internal N-Channel MOSFET BV DSS :
The PI2127’s internal N-Channel MOSFET
breakdown voltage (BV DSS ) is rated for 60V at 25°C
and will degrade to 55.5V at -40°C, refer to Figure 10.
Drain to source voltage should not exceed BV DSS in
nominal operation. During a fast switching transient
the MOSFET can tolerate voltages higher than its
BV DSS rating under avalanche conditions, refer to the
Absolute Maximum Ratings table.
In Active ORing applications when one of the input
power sources is shorted, a large reverse current is
Picor Corporation ? picorpower.com
PI2127
Rev 1.3
Page 11 of 19
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