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TLD5095EL Datasheet(PDF) 11 Page - Infineon Technologies AG |
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TLD5095EL Datasheet(HTML) 11 Page - Infineon Technologies AG |
11 / 31 page TLD5095EL Oscillator and Synchronization Datasheet 11 Rev. 1.1, 2009-12-16 6 Oscillator and Synchronization 6.1 Description R_OSC vs. switching frequency The internal oscillator is used to determine the switching frequency of the boost regulator. The switching frequency can be selected from 100 kHz to 500 kHz with an external resistor to GND. To set the switching frequency with an external resistor the following formula can be applied. In addition, the oscillator is capable of changing from the frequency set by the external resistor to a synchronized frequency from an external clock source. If an external clock source is provided on the pin FREQ/SYNC, then the internal oscillator synchronizes to this external clock frequency and the boost regulator switches at the synchronized frequency. The synchronization frequency capture range is 250 kHz to 500 kHz. Figure 4 Oscillator and Synchronization Block Diagram and Simplified Application Circuit Figure 5 Synchronization Timing Diagram TLD5095 Oscillator Clock Frequency Detector FREQ / SYNC Multiplexer PWM Logic Gate Driver SW O RFREQ VCLK Oscillator_BlkDiag_SyncFixedMode .vsd [] () [] () [] ( ) [] Ω Ω × − × × = Ω − 3 1 12 10 5 . 3 10 141 1 s FREQ s f R FREQ |
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