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UC1825-SP Datasheet(PDF) 9 Page - Texas Instruments

No. de pieza UC1825-SP
Descripción Electrónicos  RAD-TOLERANT CLASS V, HIGH-SPEED PWM CONTROLLER
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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UC1825-SP Datasheet(HTML) 9 Page - Texas Instruments

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4
5
6
4
16
6
UC1825
Clock
RT
CT
Master
RT
5
UC1825
Slave
Clock
VREF
RT
CT
Local
Ramp
CT
Two Units in Close Proximity
16
4
5
6
UC1825
VREF
Clock
RT
CT
Local
Ramp
Master
10 mF
2N222
RT
CT
43 W
0.1 mF
43 W
0.1 mF
To
Other
Slaves
24 W
24 W
CT
5
6
UC1825
Slave
Local
Ramp
CT
RT
1.5 W
RT
CT
5
6
RT
43 W
0.1 mF
43 W
0.1 mF
470 W
Generalized Synchronization
RFF
CFF
7
UC1825
RT
VIN
16
5
6
Ramp
Clock
CT
VIN
RR
9
14
11
ILIM
Shut-
Down
UC1825
Out B
Out A
CR
UC1825-SP
www.ti.com
SLUS870A – JANUARY 2009 – REVISED MARCH 2012
Figure 5. Synchronized Operation
Figure 6. Forward Technique for Off-Line Voltage Mode Application
The circuit shown in Figure 6 will achieve a constant volt-second product clamp over varying input voltages. The
ramp generator components, RT and CR are chosen so that the ramp at the ILIM/SD pin crosses the 1-V
threshold at the same time the desired maximum volt-second product is reached. The delay through the
functional nor block must be such that the ramp capacitor can be completely discharged during the minimum
deadtime.
Figure 7. Constant Volt-Second Clamp Circuit
Copyright © 2009–2012, Texas Instruments Incorporated
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