IRFR1018EPBF Datasheet, PDF (14/15 Pages) International Rectifier – HEXFET TM Power MOSFET

NCP5383
Simple Average PSPICE Model
A simple state average model shown in Figure 20 can be
used to determine a stable solution and provide insight into
the control system.
Figure 20.
Droop Injection
The VDRP signal is generated by summing the sensed
output currents for each phase and applying a gain of
approximately six. VDRP is externally summed into the
feedback network by the resistor RDRP. This induces an
offset which is proportional to the output current thereby
forcing the controlled resistive output impedance.
RRDP determines the target output impedance by the
basic equation:
Vout
Iout
+
Zout
+
RFBĂ·ĂDCRĂ·Ă5.94
RDRP
RDRP
+
RFBĂ·ĂDCRĂ·Ă5.94
Zout
(eq. 6)
Thermal Shutdown
The NCP5383 also provides Thermal Shutdown (TSD)
for added protection. The TSD circuit monitors the die
temperature and turns off the top and bottom gate drivers
if an over temperature condition is detected. The internal
soft-start capacitor is also discharged. This is a latched
state and requires a power cycle to reset.
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