L9935 datasheet(5/19 Pages) STMICROELECTRONICS

5 / 19 page

COMMON

LOGIC

OSCILLATOR

DIAGNOSTIC

BIASING

DRIVER

LOGIC

DRIVER

LOGIC

D99AT417

GND

SRA

R1 0.33

Ω

100nF

COSC

1nF

CDriver

100nF

POWER

SUPPLY

+5V

STEPPER

MOTOR

µF

OUTA2

N.C.

OSC

CDRV

OUTB2

SRB

GND

OUTA1

SCK

SDI

INTERFACE

µC

CSN

VCC

SDO

SDI

OUTB1

GND

R2 0.33

Ω

100nF

Figure 1. General Application Circuit Proposal.

Application hints:

C1 and C2 should be placed as close to the de-

vice as possible. Low ESR of C2 is advanta-

geous. Peak currents through C1 and C2 may

reach 2A. Care should be taken that the reso-

nance of C1, C2 together with supply wire induc-

tances is not the chopping frequency or a multiple

of it.

FUNCTIONAL DESCRIPTION

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 1 using a 0.33W sense re-

sistor.

Table 1.

bit5, bit2

bit4, bit1

IQX (Typ.)

IRX/max

Remark

60mA

550mA

900mA

61%

100%

inernally sensed

L9935

5/19

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