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UC2842A Scheda tecnica(PDF) 6 Page - Microsemi Corporation

Il numero della parte UC2842A
Spiegazioni elettronici  CURRENT MODE PWM CONTROLLER
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Produttore elettronici  MICROSEMI [Microsemi Corporation]
Homepage  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

UC2842A Scheda tecnica(HTML) 6 Page - Microsemi Corporation

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C URRENT M ODE PWM C ONTROLLER
UC184xA/284xA/384xA
PRODUCT DA T ABOOK 1996/1997
Copyright © 1995
Rev. 1.2
12/95
6
P RODUCTION D ATA S HEET
TYPICAL APPLICATION CIRCUITS
FIGURE 3. — CURRENT SENSE SPIKE SUPPRESSION
FIGURE 4. — MOSFET PARASITIC OSCILLATIONS
6
Q1
V
CC
DC BUS
5
R
S
R
1
UCx84xA
7
UCx84xA
3
5
6
7
R
S
C
Q1
V
CC
DC BUS
I
PK
I
PK(MAX) =
1.0V
R
S
CHANGE
FIGURE 5. — EXTERNAL DUTY CYCLE CLAMP AND MULTI-UNIT SYNCHRONIZATION
A resistor (R
1) in series with the MOSFET gate will reduce overshoot
& ringing caused by the MOSFET input capacitance and any
inductance in series with the gate drive. (Note: It is very important to
have a low inductance ground path to insure correct operation of the
I.C. This can be done by making the ground paths as short and as
wide as possible.)
The RC low pass filter will eliminate the leading edge current spike
caused by parasitics of Power MOSFET.
f = (R
A + 2RB)C
1.44
f = R
A + 2RB
R
B
Precision duty cycle limiting as well as synchronizing several parts is
possible with the above circuitry.
2
6
7
R
B
R
A
5
1
84
3
555
TIMER
4
5
8
To other
UCx84xA devices
0.01
UCx84xA


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