L6223 datasheet(15/33 Pages) STMICROELECTRONICS

15 / 33 page

Dual Device Application

Fig. 16 shows how to drive one unipolar stepper

motor by means of two L6223 Each device drives

one phase of the motor. This permits doubling of

the phase current. Since in this configuration

each sense resistor controls the phase current (in

Single only one sense resistor controls the total

motor current), we have: RS =(Vref/Ip) where Vref

is the voltage reference and Ip the phase current

in the Dual that is coincident with the chopping

current. The configuration in the figure shows the

only possible way to parallel two L6223. The use

of another configuration can cause serious de-

mage to the IC during the programming. The

waveforms required to drive the motor in half/full

step are shown in Fig. 17 and 18: as it can be

seen, the two L6223 are in SIMPLIFIED MODE

OPERATING configuration. The half step drive

can be achieved by driving the inputs IN3 which

are ENABLE inputs.

Figure 17: Inputs for Half Step drive dual device SMO.

Figure 18: Inputs for Full Step drive single device SMO.

Dot Matrix Printer Motor Driver

Fig. 19 shows how to drive the paper feed and

the carriage motors by means of 3 L6223 using a

very low wire number. The carriage motor is

driven by two paralleled L6223, the paper feed

motor, which requires a lower current, uses one

L6223. The three ICs are working in SIMPLIFIED

MODE OPERATING. The inputs IN1-IN2, IN3 are

driven as previously seen (Single and Dual De-

vice configuration). The inputs IN4 and DA/CLEV

are grounded so that the ICs work in reduced cur-

rent levels. This means L6223 can select seven

current levels through programming: four in

closed loop and three in open loop. The input

DA/OPLO is used to load the programming data;

only the device in PROGRAMMING MODE is pro-

grammed. The two paralleled L6223 can deliver

up to 2A/phase while the single L6223, 1A/phase.

L6223

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