поискавой системы для электроныых деталей |
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ISL54208 датащи(PDF) 11 Page - Intersil Corporation |
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ISL54208 датащи(HTML) 11 Page - Intersil Corporation |
11 / 15 page 11 FN6410.0 December 18, 2006 EXTERNAL SERIES RESISTOR AT IN LOGIC CONTROL PIN The ISL54208 contains a clamp circuit between IN and VDD. Whenever the IN voltage is greater than the VDD voltage by more than 2.55V, current will flow through this clamp circuitry into the VDD power supply bus. During normal USB operation, VDD is in the range of 2.7V to 3.6V and IN (VBUS voltage from computer or USB hub) is in the range of 4.4V to 5.25V, the clamp circuit is not active and no current will flow through the clamp into the VDD supply. In a USB application, the situation can exist where the VBUS voltage from the computer could be applied at the IN pin before the VDD voltage is up to its normal operating voltage range and current will flow through the clamp into the VDD power supply bus. This current could be quite high when VDD is OFF or at 0V and could potentially damage other components connected in the circuit. In the application circuit, a 22kΩ resistor has been put in series with the IN pin to limit the current to a safe level during this situation. It is recommended that a current limiting resistor in the range of 10kΩ to 50kΩ be connected in series with the IN pin. It will have minimal impact on the logic level at the IN pin during normal USB operation and protect the circuit during the time VBUS is present before VDD is up to its normal operating voltage. Note: No external resistor is required in applications where IN pin voltage will not exceed VDD by more than 2.55V. Typical Performance Curves TA = +25°C, Unless Otherwise Specified FIGURE 10. THD+N vs SUPPLY VOLTAGE vs FREQUENCY FIGURE 11. THD+N vs SIGNAL LEVELS vs FREQUENCY FIGURE 12. THD+N vs OUTPUT VOLTAGE FIGURE 13. THD+N vs OUTPUT POWER FREQUENCY (Hz) 20 200 2K 20K 0.04 0.05 0.06 0.07 0.08 0.09 0.1 0.11 VDD = 2.6V VDD = 2.7V VDD = 3.6V VDD = 3V RLOAD = 32Ω VLOAD = 0.707VRMS FREQUENCY (Hz) 20 200 2K 20K RLOAD = 32Ω VDD = 3V 0 0.1 0.2 0.3 0.4 2VP-P 1VP-P 3VP-P 2.5VP-P OUTPUT VOLTAGE (VP-P) 00.5 11.5 2 2.533.5 0 0.1 0.2 0.3 0.4 0.5 RLOAD = 32Ω FREQ = 1kHz VDD =3V OUTPUT POWER (mW) 0 1020304050 0 0.1 0.2 0.3 0.4 0.5 RLOAD = 32Ω FREQ = 1kHz VDD =3V ISL54208 |
Аналогичный номер детали - ISL54208 |
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Аналогичное описание - ISL54208 |
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