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UC1825A Datasheet(PDF) 9 Page - Texas Instruments

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No. de pieza UC1825A
Descripción Electrónicos  HIGH-SPEED PWM CONTROLLER
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Fabricante Electrónico  TI1 [Texas Instruments]
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UC1825A Datasheet(HTML) 9 Page - Texas Instruments

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UC1823A, UC2823A, UC2823B,
UC3823A, UC3823B, UC1825A,
UC2825A, UC2825B, UC3825A, UC3825B
SLUS334E − AUGUST 1995 − REVISED SEPTEMBER 2010
www.ti.com
9
CONTROL METHODS
UDG−95109
UDG−95110
Current Mode
Voltage Mode
.
Figure 8. Control Methods
SYNCHRONIZATION
The oscillator can be synchronized by an external pulse inserted in series with the timing capacitor. Program the free
running frequency of the oscillator to be 10% to 15% slower than the desired synchronous frequency. The pulse width
should be greater than 10 ns and less than half the discharge time of the oscillator. The rising edge of the CLK/LEB pin
can be used to generate a synchronizing pulse for other chips. Note that the CLK/LEB pin no longer accepts an incoming
synchronizing signal.
Figure 9. General Oscillator Synchronization
UDG−95111
UDG−95113
Figure 10. Two Unit Interface
UDG−95112
Figure 11. Operational Waveforms


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