L6919C

24/32

Two main configurations can be distinguished: Single Supply (VCC=VIN=12V) and Double Supply (VCC=12V

VIN=5V or different).

– Single Supply: In this case JP6 has to be completely shorted. The device is supplied with the same rail

that is used for the conversion. With an additional zener diode DZ1 a lower voltage can be derived to

supply the mosfets driver if Logic level mosfet are used. In this case JP1 must be left open so that the

and JP2 can be freely shorted in one of the two positions.

for the power conversion. This last one can start indifferently from the 5V bus (Typ.) or from other buses

allowing maximum flexibility in the power conversion. Supply for the mosfet driver can be programmed

on the requirements.

Some examples are reported in the following Figures 20 and 21.

Figure 20. Jumpers configuration: Double Supply

Figure 21. Jumpers configuration: Single Supply

Vin = 5V

GNDin

DZ1

JP2

JP1

Vcc = 12V

GNDcc

JP6

Vcc = 12V

HS Drains = 5V

HS Supply = 5V

VCCDR (LS Supply) = 5V

Vin = 5V

GNDin

DZ1

JP2

JP1

Vcc = 12V

GNDcc

JP6

Vcc = 12V

HS Drains = 5V

HS Supply = 12V

VCCDR (LS Supply) = 12V

Vin = 12V

GNDin

DZ1 6.8V

JP2

JP1

Vcc = Open

GNDcc

JP6

Vcc = 12V

HS Drains = 12V

HS Supply = 5.2V

VCCDR (LS Supply) = 12V

Vin = 12V

GNDin

DZ1

JP2

JP1

Vcc = Open

GNDcc

JP6

Vcc = 12V

HS Drains = 12V

HS Supply = 12V

VCCDR (LS Supply) = 12V