SNVSCF7 December 2022 TPS3435
PRODUCTION DATA
The TPS3435 also utilizes a programmable output assert delay, using a precision current source to charge an external capacitor upon device startup. By monitoring the voltage on the CRST pin, the TPS3435 can be programmed to have a desired output assert delay. The typical delay time resulting from a given external capacitance on the CRST pin can be calculated by Equation 3, where tWDO is the output assert delay time in seconds and CCRST is the capacitance in microfarads.
Note that in order to minimize the difference between the calculated output assert delay time and the actual output assert delay time, use a high-quality ceramic dielectric COG, X5R, or X7R capacitor and minimize parasitic board capacitance around this pin. Table 9-1 lists the output assert delay time ideal capacitor values for CCRST.
CCRST | OUTPUT ASSERT DELAY TIME (tWDO) | UNIT | ||
---|---|---|---|---|
MIN(1) | TYP | MAX(1) | ||
10 nF |
39.6 | 49.5 |
59.4 | ms |
100 nF |
396 |
495 |
594 | ms |
1 μF |
3960 |
4950 |
5940 | ms |