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Is constant off time mode available with both these IC's

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I wish to use the Supetex HV9910B LED driver in constant off time mode.

Supertex HV9910B LED driver IC:
**broken link removed**

....The datasheet says constant off time is achieved by connecting the RT resistor to the FET gate driver, instead of to ground.

However, the MXHV9910 is clearly EXACTLY the same part, and yet this constant off time mode is not advertised for this version of the chip....

Clare MXHV9910 LED driver IC.

.....So, as you can see, these two IC's are one and the same, so why is the Supertex version offering constant off time mode, but not the clare.com version.?

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