L6935TR datasheet(15/20 Pages) STMICROELECTRONICS

15 / 20 page

Application information

L6935

15/20

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

VIN

CIN

COUT

VOUT = 0.5V to 3.0V

PGOOD

L6935

VIN

GND

ADJ

VOUT

PGOOD

CSS

VBIAS

PAD

REH

REL

RPG

(OpenDrain Toggle **)

** Drive EN with external Open-Drain Signal.

CIN

COUT

VOUT = 0.5V to 3.0V

PGOOD

L6935

VIN

GND

ADJ

VOUT

PGOOD

CSS

VBIAS

PAD

REL

RPG

(OpenDrain Toggle **)

VBIAS

VIN (< VBIAS)

* EN Divider (R

EH) needs to be connected to the Last-Coming rail between VCC and VIN.

** Drive EN with external Open-Drain Signal.

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