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UC1825A-SP Arkusz danych(PDF) 11 Page - Texas Instruments

Numer części UC1825A-SP
Szczegółowy opis  Rad-Tolerant Class-V, High-Speed PWM Controller
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
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UC1825A-SP Arkusz danych(HTML) 11 Page - Texas Instruments

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UDG-95111
39
50-
External
Clock
10
6
5
R
T
R
T
C
T
V
SYNC
UDG-95110
CT
1.25 V
CT
from E/A
Oscillator
Voltage Mode
Current Mode
RAMP
CT
7
6
1.25 V
R
SENSE
I
SWITCH
from E/A
Oscillator
RAMP
CT
7
6
UC1825A-SP
www.ti.com
SLUS873B – JANUARY 2009 – REVISED OCTOBER 2015
Feature Description (continued)
8.3.4 Control Methods
Figure 7 shows the control methods.
Figure 7. Control Methods
8.3.5 Synchronization
The oscillator can be synchronized by an external pulse inserted in series with the timing capacitor (see
Figure 8). Program the free running frequency of the oscillator to be 10% to 15% slower than the desired
synchronous frequency. The pulse width must be greater than 10 ns and less than half the discharge time of the
oscillator. Figure 9 shows how to synchronize two ICs, with one as master and one as slave. Figure 10 shows
the waveforms in a master and slave configuration.
NOTE
The CLK/LEB pin no longer accepts an incoming synchronizing signal.
Figure 8. General Oscillator Synchronization
Copyright © 2009–2015, Texas Instruments Incorporated
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