L6230 Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

L6230

DMOS driver for three-phase brushless DC motor

STMicroelectronics 

Application information

L6230

The uncommitted internal comparator with open-drain output is available.

Figure 14. F.O.C. typical application



63

6$#

#

#

0/7%2

'2/5.$

3)'.!,

'2/5.$

$

#0

$

#"//4

2 3%.3%

2 3%.3%

2 3%.3%

"%$

4JHOBM
DPOEJUJPOJOH





4(2%%0(!3%

-/4/2

-

63!

63"

6#0

6"//4

3%.3% 

3%.3% 

3%.3% 

#0

#0

/54

/54

/54

$)!'%.

).

%.

).

%.

).

%.

#0/54

'.$

2%.

#%.

%.!",%

).

%.

).

%.

).

%.

6.2

Six-step driving method with current control

In this configuration only one sense resistor are needed, the three OUT pins are connected

together to RSENSE (see Figure 15).

The non-inverting input comparator CP+ monitors the voltage drop across the external

sense resistor connected between the source of the three lower power MOS transistors and

ground.

As the current in the motor increases the voltage across the RSENSE increases

proportionally. When the voltage drop across the sense resistor becomes greater than the

reference voltage applied at inverting input CP- the comparator open-drain output is

switched on pulling down the CPOUT pin.

This signal could be managed by controller to generate the proper input sequence for six-

step driving method with current control and select what current decay method to

implement.

When the sense voltage decrease below the CP- voltage, the open-drain is switched off and

the voltage at CPOUT pin start to increase charging the capacitor C3.

The reference voltage at pin CP- will be set according to sense resistor value and the

desired regulated current (VCP- { RSENSE x ITARGET). A very simple way to obtain variable

voltage is to low-pass filter a PWM output of a controller.

16/24

Doc ID 18094 Rev 2

Share Link: