ZHCSKR9A January 2020 – March 2020 TPS59603-Q1
PRODUCTION DATA.
The SKIP pin incorporates the input tri-state buffer as PWM. The function is somewhat different. When SKIP is low, the zero crossing (ZX) detection comparator is enabled, and DCM mode operation occurs if the load current is less than the critical current. When SKIP is high, the ZX comparator disables, and the converter enters FCCM mode. When the SKIP pin is in a tri-state condition, typical operation forces the gate driver outputs low and the driver enters a very-low-power state. In the low-power state, the UVLO comparator remains off to reduce quiescent current. When the SKIP pin voltage is pulled either low or high, the driver wakes up and is able to accept PWM pulses in less than 50 µs.
Table 1 shows the logic functions of UVLO, PWM, SKIP, DRVH, and DRVL.
| UVLO | PWM | SKIP | DRVL | DRVH | MODE |
|---|---|---|---|---|---|
| Active | — | — | Low | Low | Disabled |
| Inactive | Low | Low | High(1) | Low | DCM(1) |
| Inactive | Low | High | High | Low | FCCM |
| Inactive | High | H or L | Low | High | |
| Inactive | Tri-state | H or L | Low | Low | Low power |
| Inactive | — | Tri-state | Low | Low | Very-low power |