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UC1825A 데이터시트(PDF) 9 Page - Texas Instruments |
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UC1825A 데이터시트(HTML) 9 Page - Texas Instruments |
9 / 18 page UC1823A,UC2823A, UC2823B, UC3823A,UC3823B,UC1825A, UC2825A,UC2825B,UC3825A,UC3825B SLUS334D − AUGUST 1995 − REVISED NOVEMBER 2008 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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