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TS3003 Folha de dados(PDF) 9 Page - Touchstone Semiconductor Inc |
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TS3003 Folha de dados(HTML) 9 Page - Touchstone Semiconductor Inc |
9 / 10 page TS3003 TS3003DS r1p0 Page 9 RTFDS TS3003 Start-up Time As the TS3003 is powered up, its FOUT terminal (and PWMOUT terminal, if enabled) is active once the applied VDD is higher than 1.55V. Once the applied VDD is higher than 1.55V, the master oscillator achieves steady-state operation within 8ms. Divide the PWMOUT Output Frequency by Two with the TS3003 Using a single resistor and capacitor, the TS3003 can be configured to a divide by two circuit as shown in Figure 2. To achieve a divide by two function with the TS3003, the pulse width of the PWMOUT output must be at least a factor of 2 greater than the period set at FOUT by resistor RSET. The CPWM capacitor selected must meet this pulse width requirement and can be calculated using Equation 2. In Figure 3, a value of 4 .32MΩ for RS T sets the O T output period to 40µs. A CPWM capacitor of 265pF was chosen, which sets the pulse width of PWMOUT to approximately 80µs. This is well above the required minimum pulse width of 40µs. Using the TS3003 and a Potentiometer to Dim an LED The TS3003 can be configured to dim an LED by modulating the pulse width of the PWMOUT output. With an RSET= 2 MΩ, the O T output frequency is approximately 51kHz (or 19.5µs period). Refer to Figure 3. The CPWM capacitor was calculated using Equation 2 with a pulse width of 15µs. To reduce the pulse width from 15µs and in turn, dim the LED, a 1MΩ potentiometer is used. The potentiometer is connected to the PWM_CNTRL pin in a voltage divider configuration. The supply voltage of the circuit is 5V. . Figure 2: Configuring the TS3003 into a Divide by Two Frequency Divider Figure 3: TS3003 Configured to Dim an LED with a Potentiometer |
Nº de peça semelhante - TS3003 |
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Descrição semelhante - TS3003 |
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