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lm3421 led driver off time

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T

treez

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Please could you advise on the operation of the LM3421 LED driver IC?

LM3421 datasheet:
**broken link removed**
(block diagram is on page 10)

1….Off time duration:
Is the off time duration simply the length of time that it takes the “CT” capacitor, connected to pin 5, “RCT”, to charge up from 0V to Vin/25 Volts?
(page 30 shows the “RCT” pin and buckboost connection.)
I presume that during the main FET ON time, the RCT pin is held at 0V by the internal FET inside the LM3421?
 

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