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Connecting biasing network to start-up a SEPIC with TLD509xEP

Connecting biasing network to start-up a SEPIC with TLD509xEP

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Connecting the biasing network to start-up a SEPIC in constant output voltage configuration with TLD509xEP can be realized with a signal diode and a limiting resistor from https://www.infineon.com/export/sites/default/en/about-infineon/company/contacts/support/images/SEPI... IVCC to FBH pin.
With this solution the DC-DC performs as follows:
1. The soft-start routine triggers at power-up (FBH and FBL are kept above the short-to-ground detection).
2. When the soft-start elapses, the regulator keeps the control.
If the biasing network is connected to the FBL pin, the device performs the following sequence:
1. The soft-start routine triggers at power-up (FBH and FBL are kept above the short-to-ground detection).
2. An open load detection (i.e. the reverse current is detected as open load) can be triggered:
* if the open load fault triggers, the SWO gate driver is disabled, the voltage on COMP pin is frozen and a fault is reported.
* If the open load fault doesn't trigger, the regulator keeps the control.
3. If a power-up sequence is applied before Ccomp discharge, the device is able to exit from the fault condition.
For more information, please check the datasheets https://www.infineon.com/cms/en/product/power/lighting-ics/litix-automotive-led-driver-ic/litix-powe... here

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