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UC2845AM Fiches technique(PDF) 6 Page - Microsemi Corporation

No de pièce UC2845AM
Description  CURRENT MODE PWM CONTROLLER
Download  8 Pages
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Fabricant  MICROSEMI [Microsemi Corporation]
Site Internet  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

UC2845AM Fiches technique(HTML) 6 Page - Microsemi Corporation

  UC2845AM Datasheet HTML 1Page - Microsemi Corporation UC2845AM Datasheet HTML 2Page - Microsemi Corporation UC2845AM Datasheet HTML 3Page - Microsemi Corporation UC2845AM Datasheet HTML 4Page - Microsemi Corporation UC2845AM Datasheet HTML 5Page - Microsemi Corporation UC2845AM Datasheet HTML 6Page - Microsemi Corporation UC2845AM Datasheet HTML 7Page - Microsemi Corporation UC2845AM Datasheet HTML 8Page - 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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