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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM8803TR датащи(PDF) 25 Page - STMicroelectronics |
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PM8803TR датащи(HTML) 25 Page - STMicroelectronics |
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25 / 34 page  PM8803 PWM controller Doc ID 018559 Rev 2 25/34 5 PWM controller 5.1 Oscillator The internal oscillator frequency can be programmed by connecting an external resistor RT between the FRS and ARTN pins. The relationship between the oscillator frequency FOSC and the RT resistor is: The PWM switching frequency is equal to the programmed oscillator frequency. The useful range for RT is between 20 k to 200 kOhm Figure 11. PWM frequency vs. RT 5.2 Delay time control The delay between the rising edge of GAT2 and GAT1 waveforms can be set by putting a programming resistor RDT between DT and AGND or VB. The relationship between the delay time and the RDT resistor is: F osc kHz () 25000 3k Ω R + T kΩ () ------------------------------------- = 0 100 200 300 400 500 600 700 800 900 1000 1100 0 20 40 60 80 100 120 140 160 180 200 220 240 FOSC [kHz] RT [kOhm] AM045101v1 t del ns () 1.6R DT kOhm () = |
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