Functional description

L9935

12/29

Doc ID 5198 Rev 10

5

Functional description

5.1

Basic structure

The L9935 is a dual full bridge driver for inductive loads with a chopper current regulation.

Outputs A1 and A2 belong to full bridge A Outputs B1 and B2 belong to full bridge B.

The polarity of the bridges can be controlled by bit0 and bit3 (for full bridge A, bit3, for full

bridge B, bit0). Bit5, bit4 (for full bridge A) and bit2, bit1 (for full bridge B) control the

currents. Bit3 high leads to output A1 high. Bit0 high leads to output B1 high.

Current setting Table 6 using a 0.33

 sense resistor.

Figure 4.

Typical average load current dependence on RSense

Table 6.

Current setting

bit5, bit2

bit4, bit1

IQX (Typ.)

IRX/max

Remark

H

H

0

0 %

-

H

L

60 mA

-

internally sensed

L

H

550 mA

61 %

-

L

L

900 mA

100 %

-