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UC1844AY View Datasheet(PDF) - Microsemi Corporation

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UC1844AY
Microsemi
Microsemi Corporation Microsemi
UC1844AY Datasheet PDF : 8 Pages
1 2 3 4 5 6 7 8
PRODUCT DATABOOK 1996/1997
UC184xA/284xA/384xA
CURRENT MODE PWM CONTROLLER
PRODUCTION DATA SHEET
T Y P I C A L A P P L I C AT I O N C I R C U I T S
FIGURE 3. — CURRENT SENSE SPIKE SUPPRESSION
VCC
DC BUS
FIGURE 4. — MOSFET PARASITIC OSCILLATIONS
VCC
DC BUS
7
UCx84xA
6
5
3
Q1
CHANGE
C
RS
IPK
IPK(MAX) =
1.0V
RS
7
R1
Q1
UCx84xA 6
RS
5
The RC low pass filter will eliminate the leading edge current spike
caused by parasitics of Power MOSFET.
A resistor (R1) 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.)
FIGURE 5. — EXTERNAL DUTY CYCLE CLAMP AND MULTI-UNIT SYNCHRONIZATION
8
RA
8
4
7
UCx84xA
RB
6
555
TIMER
3
4
2
5
1
0.01
5
To other
f=
1.44
(RA + 2RB)C
UCx84xA devices
f=
RB
RA + 2RB
Precision duty cycle limiting as well as synchronizing several parts is
possible with the above circuitry.
6
Copyright © 1995
Rev. 1.2a 10/25
 

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