TB6560HQ/FG

2006-05-31

22

Current Draw-out Path when ENABLE is Input in Mid Operation

When all the output transistors are forced OFF during Slow mode, the coil energy is drawn out in the

following modes:

Note: Parasitic diodes are indicated on the designed lines. However, these are not normally used in Mixed

Decay mode.

As shown in the figure above, an output transistor has parasitic diodes.

Normally, when the energy of the coil is drawn out, each transistor is turned ON and the power flows in the

opposite-to-normal direction; as a result, the parasitic diode is not used. However, when all the output

transistors are forced OFF, the coil energy is drawn out via the parasitic diode.

U1

L1

U2

L2

PGND

OFF

OFF

U1

L1

U2

L2

OFF

ON

Note

Load

PGND

U1

L1

U2

L2

OFF

OFF

Note

Load

PGND

Note

ON

ON

Load

Charge Mode

Slow Mode

Force OFF Mode

ON

OFF

OFF

ENABLE is input

OFF