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ISL6173DRZA-T Datasheet(PDF) 11 Page - Intersil Corporation |
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ISL6173DRZA-T Datasheet(HTML) 11 Page - Intersil Corporation |
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11 / 20 page  11 FN9186.3 January 3, 2006 The two channels can be forced to track each other by simply tying their SS pins together and using a common SS capacitor. In addition, their EN pins also must be tied together. Typical Start-up waveforms in this mode are shown in Figure 15. If one channel goes down for any reason, the other one will too. One important thing to note here is that only the overcurrent latch-off mode will work. Auto-retry feature WILL NOT work. Retry must be controlled manually through EN. Typical Hot-plug Power Up Sequence 1. When power is applied to the IC on the BIAS pin, the first charge pump immediately powers up. 2. If the BIAS voltage is 2.1V or higher, the IC comes out of POR. Both SS and CT caps remain discharged and the gate (GT) voltage remains low. 3. ENx pin, when pulled low (below it’s specified threshold), enables the respective channel. 4. SSx cap begins to charge up through the internal 10µA current source, the gate (GT) voltage begins to rise and the corresponding output voltage begins to rise at the same rate as the SS cap voltage. This is tightly controlled by the soft-start amplifier shown in the block diagram. 5. SS cap begins to charge but the corresponding CTx cap is held discharged. 6. Fault (FLT) remains deasserted (stays high) and the output voltage continues to rise. 7. If the load current on the output exceeds the set current limit for greater than the OC timeout period, FLT gets asserted and the channel shutdown occurs. 8. If the voltage on UV pin exceeds 633mV threshold as a result of rising Vo, the Power Good (PG) output goes active. 9. At the end of the SS interval, the SS cap voltage reaches CPVDD and remains charged as long as EN remains asserted or there is no other fault condition present that would attempt to pull down the gate. State Diagram This is shown in Figure 16. It provides a quick overview of the IC operation and can also be used as a troubleshooting road map. ISL6173 |
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