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MCP1401/02
4.5
Power Dissipation
4.5.2
QUIESCENT POWER DISSIPATION
The total internal power dissipation in a MOSFET driver
is the summation of three separate power dissipation
elements.
EQUATION 4-1:
The power dissipation associated with the quiescent
current draw depends upon the state of the input pin.
The MCP1401/02 devices have a quiescent current
draw when the input is high of 0.85 mA (typical) and
0.1 mA (typical) when the input is low. The quiescent
power dissipation is shown in Equation 4-3 .
Where:
P T
P T = P L + P Q + P CC
= Total power dissipation
EQUATION 4-3:
P Q = ( I QH × D + I QL × ( 1 – D ) ) × V DD
P L
=
Load power dissipation
Where:
P Q
P CC
=
=
Quiescent power dissipation
Operating power dissipation
I QH
=
Quiescent current in the high
state
D
=
Duty cycle
4.5.1
CAPACITIVE LOAD DISSIPATION
I QL
=
Quiescent current in the low
The power dissipation caused by a capacitive load is a
state
direct function of frequency, total capacitive load, and
V DD
=
MOSFET driver supply voltage
supply voltage. The power lost in the MOSFET driver
for a complete charging and discharging cycle of a
MOSFET is shown in Equation 4-2 .
4.5.3
OPERATING POWER DISSIPATION
The operating power dissipation occurs each time the
EQUATION 4-2:
MOSFET driver output transitions because for a very
short period of time both MOSFETs in the output stage
Where:
P L = f × C T × V DD
2
are on simultaneously. This cross-conduction current
leads to a power dissipation described in Equation 4-4 .
f
C T
V DD
=
=
=
Switching frequency
Total load capacitance
MOSFET driver supply voltage
EQUATION 4-4:
P CC = CC × f × V DD
Where:
CC
=
Cross-conduction constant
(A*sec)
? 2007 Microchip Technology Inc.
f
V DD
=
=
Switching frequency
MOSFET driver supply voltage
DS22052B-page 11
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