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TC429 датащи(PDF) 10 Page - Microchip Technology

номер детали TC429
подробное описание детали  6A Single High-Speed, CMOS Power MOSFET Driver
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

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TC429
DS21416C-page 10
 2003 Microchip Technology Inc.
The device capacitive load dissipation is:
EQUATION
Quiescent power dissipation depends on input signal
duty cycle. A logic low input results in a low-power
dissipation mode with only 0.5 mA total current drain.
Logic-high signals raise the current to 5 mA maximum.
The quiescent power dissipation is:
EQUATION
Transition power dissipation arises because the output
stage N- and P-channel MOS transistors are ON
simultaneously for a very short period when the output
changes.
The device transition power dissipation is approxi-
mately:
EQUATION
An example shows the relative magnitude for each
item.
TABLE 4-1:
MAXIMUM OPERATING
FREQUENCIES
FIGURE 4-5:
Peak Output Current
Capability.
4.5
POWER-ON OSCILLATION
Power-on oscillations are due to trace size, layout and
component placement. A ‘quick fix’ for most applica-
tions that exhibit power-on oscillation problems is to
place approximately 10 k
Ω in series with the input of
the MOSFET driver.
C
= 2500 pF
VS
= 15V
D
= 50%
f
= 200 kHz
PD
= Package power dissipation:
= PC + PT + PQ
= 113 mW + 10 mW + 41 mW
= 164 mW
Maximum ambient operating temperature:
= TJ – θJA (PD)
= 150ºC - (150ºC/W)(0.164W)
= 125
°C
Where:
TJ
= Maximum allowable junction temperature
(+150
°C)
θJA
= Junction-to-ambient thermal resistance
(150
°C/W, CERDIP)
PC
fCVS
2
=
Where:
f = Switching frequency
C = Capacitive load
VS = Supply voltage
PQ VS DIH
()
1D
()IL
+
()
=
Where:
IH = Quiescent current with input high
IL = Quiescent current with input low
D = Duty cycle
(5 mA max)
(0.5 mA max)
PT fVS 3.3 10
9
ASec
×


=
Note:
Ambient operating temperature should not
exceed +85ºC for EPA or EOA devices or
+125ºC for MJA devices.
VS
fMAX
18V
500 kHz
15V
700 kHz
10V
1.3 MHz
5V
>2 MHz
Conditions:
1.
CERDIP Package (
θJA =150°C/W)
2.
TA = +25°C
3.
CL = 2500 pF
Note:
It is extremely important that all MOSFET
driver applications be evaluated for the
possibility of having high-power oscillations
occur during the power-on cycle.
TIME (5
µs/DIV)
VS = 18V
RL = 0.1Ω
5V
INPUT
OUTPUT
5
µs
500mV
5V/DIV
500mV/DIV
(5 AMP/DIV)


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