HV301/HV311
Technical Update / Alert
This alert applies to the HV301, HV302, HV311, and HV312 Hotswap Controllers
The internal circuit breaker may trip unintentionally in situ-
ations when the voltage at the VDD pin rises slowly as power
is applied.
The inadvertant tripping of the circuit breaker does not
occur when the input voltage slew rate is greater than 400V
per ms. In a typical hotswap application, the rise of the
input voltage occurs in a couple of microseconds, and the
slew rate is well in excess of of the value necessary to
cause tripping of the circuit breaker.
This unintended tripping of the circuit breaker causes the
power-on sequence to be delayed by an additional Auto-
matic Restart Delay. The extra delay can be observed by
viewing the voltage waveform at the RAMP pin.
Subsequent to this delay, this device will perform a regu-
lar start-up, thereby providing power to the load.
If technical assistance is required, please contact our applications department by e-mail at apps@supertex.com, or by
telephone at 408-222-4895.
Dtc.#VDSFPV-VHꢀ301/Hꢀ311
A092605
A092605
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SUPERTEX [ Supertex, Inc ]
