L9969X datasheet(19/70 Pages) STMICROELECTRONICS

19 / 70 page

Information is needed about the behavior of the inputs and outputs during inverse current. Furthermore,

information is needed on the reliability of information stored in internal registers during inverse current.

Figure 10. Inverse current

5 V < VBATT < 18 V, 4.5 V < VDD < 5.5 V, TJ= -40 °C to 150 °C, unless otherwise specified.

Table 13. Inverse Current

Symbol

Parameter

Condition

Min

Typ

Max

Unit

IVS,INV

Inverse Current

250 ms

VVS_slew_inv

Maximum slew rate during inverse current

-5

V/µs

3.2.3

Reverse current

Reverse current is different from inverse Current. It is the current flowing in the load during the passive free-

wheeling phase, and passing through the low-side body diode, as soon as the high-side of the same branch is

switched OFF.

To reduce internal power losses, the free-wheeling is designed in such a way that, after some period of time, the

free-wheel diode is actively short-cut by the transistor channel (beginning the so-called active free-wheeling).

5 V < VBATT < 18 V, 4.5 V < VDD < 5.5 V, TJ= -40 °C to 150 °C, unless otherwise specified.

Table 14. Reverse current

Symbol

Parameter

Condition

Min

Typ

Max

Unit

Free-wheel diode forward voltage

IOUT = 3 A

trr

Free-wheel diode reverse recovery time

100

If the H-bridge is in internal current limitation or in thermal current reduction mode, the above-mentioned short-

circuiting of the free-wheeling diode is enabled or disabled according to the status of the free-wheeling bit in the

SPI register: CONFIG_REG.FW = 1 (short-cut enabled - active free wheeling) or CONFIG_REG.FW = 0 (short-

cut disabled – passive free wheeling).

L9969x

Functional description

DS14029 - Rev 6

page 19/70

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