L6230 Ver la hoja de datos (PDF) - STMicroelectronics

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componentes Descripción

Fabricante

L6230

DMOS driver for three-phase brushless DC motor

STMicroelectronics 

L6230

6

Application information

Application information

Some typical applications using L6230 are shown in this paragraph. A high quality ceramic

capacitor (C2) in the range of 100 nF to 200 nF should be placed between the power pins

VSA and VSB and ground near the L6230 to improve the high frequency filtering on the

power supply and reduce high frequency transients generated by the switching. The

capacitor (CEN) connected from the DIAG-EN input to ground sets the shut down time when

an over current is detected (see overcurrent protection). The current sensing inputs

(SENSEX) should be connected to the sensing resistors RSENSE with a trace length as short

as possible in the layout. The sense resistors should be non-inductive resistors to minimize

the dI/dt transients across the resistors. To increase noise immunity, unused logic pins are

best connected to 5 V (high logic level) or GND (low logic level) (see pin description). It is

recommended to keep power ground and signal ground separated on PCB.

Table 8. Component values for typical application

Component

Value

C1

C2

CBOOT

CEN

CP

D1

D2

REN

100 µF

100 nF

220 nF

5.6 nF

10 nF

1N4148

1N4148

100 kΩ

The examples reported describe some typical application to drive a 3-phase BLDC motor

using L6230 device.

In the first example is shown a field oriented control (FOC) system, with this method it is

possible to provide smooth and precise motor control of BLDC motors.

A six-step driving method with current control is reported in the second example, the inputs

sequence is generated by external controller and the L6230 comparator is used to obtain

the information for the peak current control.

Finally, the third example shows how to implement a sensorless motor control system, the

information on rotor position is achieved by BEMF zero-crossing detection.

6.1

Field oriented control driving method

In this configuration (see Figure 14) three sensing resistors are required, one for each

channel. The sensing signals coming from the output power stage are conditioned by

external operational amplifiers which provide the proper feedback signals to the AtoD

converter and the system controller. According to the feedback signals the six input lines are

generated by the controller.

Note that some filtering and level shifting RC networks should be added between the sense

resistor and the correspondent op-amp input.

Doc ID 18094 Rev 2

15/24

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