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SOA Thermal Cycling:
The PI2211 continuously monitors the power dissipation in
the MOSFET by measuring the voltage drop across the
MOSFET (V DS ) and the calculated current through the sense
resistor (I DRAIN ). As previously described the power
information is processed through two equivalent internal
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PI2211
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a series current limiting resistor (RAUX), as is shown in Figure
6, to protect the internal clamp of the VCC pin. The RAUX
limiting resistor is calculated as: RAUX = (VAUX - 3.8V)/10mA.
Though the BUS pin is not used to generate VCC, it still must
be connected to the BUS supply for proper operation.
networks whose individual responses emulate the MOSFET
R ? J-C and R ? C-A thermal characteristics. These two responses
are summed together to create an accurate R ? J-A thermal
response.
When the computed junction temperature rise in the
MOSFET is 60°C, the MOSFET is turned off and, while still
being continuously monitored, allowed to cool to a calculated
junction temperature rise of 21°C (an estimated drop of
39°C). The MOSFET is once again turned on and monitored.
The PI2211 will continue the thermal cycling of the MOSFET
16 times with this temperature hysteresis range before
dropping the cool down temperature to 3°C rise. Once at
3°C, the PI2211 will continue the thermal cycling indefinitely
with a 57°C temperature hysteresis range resulting in a long
cool down period. An example of this SOA thermal cycling is
shown below in Figure 5 and in Figure 11.
Figure 6 - External VAUX connection for lower BUS voltages.
The PI2211 has an internal charge pump that requires no
external components and is designed to be used with
MOSFET that can operate with a gate drive of 4.5Vdc.
Figure 5 - SOA Thermal Cycling
Figure 5 shows the initial string of 16 SOA pulses. The V GS is
displayed on Ch1 (blue), the start-up current is shown on Ch3
(purple) and the BUS voltage is shown on Ch4 (green). Power
-good is shown on Ch2 (light blue), which is low during SOA.
VAUX Supply/Gate Drive:
The PI2211 is designed to be used in systems where the BUS
voltage range is from 0.9Vdc to 14Vdc. When using a BUS
voltage of 4.5Vdc or greater, the PI2211 internal LDO
regulator creates a VCC voltage of 4Vdc to bias the IC.
When using a BUS of less than 4.5Vdc, an external supply
(VAUX) is required to drive VCC; typically 5Vdc or greater with
Figure 7 - Enable, UV and OV thresholds.
Picor Corporation · picorpower.com
PI2211
Rev 1.0, Page 11 of 26
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