Application information

L6935

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6.2

VIN, VBIAS and sequencing

Different configurations for VIN and VBIAS are possibleand the power sequencing must

consider the different timings in which the power suppliesbecomes available. In order to

properly drive the device internal logic, it is reccomendedto control the sequence between

EN signal and the VIN / VBIAS application: the device need to result being disabled when

VBIAS crosses the UVLO threshols. Furthermore, in case of VIN <> VBIAS, the EN signal

needs to be driven by the last-coming between the two supplies.

It is reccomended to drive the EN pin with a resistor divider connected as reported into

Figure 13 and Figure 14.

Figure 13.

Recommended circuit for VBIAS = VIN

Figure 14.

Reccomended circuit for VBIAS

VIN

VOUT = 0.5V to 3.0V

PGOOD

L6935

VIN

SS

GND

ADJ

VOUT

PGOOD

EN

VBIAS

PAD

EN

(OpenDrain Toggle **)

** Drive EN with external Open-Drain Signal.

VOUT = 0.5V to 3.0V

PGOOD

L6935

VIN

SS

GND

ADJ

VOUT

PGOOD

EN

VBIAS

PAD

EN

(OpenDrain Toggle **)

VBIAS

VIN (< VBIAS)

* EN Divider (R

** Drive EN with external Open-Drain Signal.