Designing an application with the L6230

AN4243

12/29

Doc ID 024199 Rev 1

2.7

Sharing the charge pump circuitry

If more than one device is used in the application, it is possible to use the charge pump from

charge pump must be connected together.

The higher the number of devices sharing the same charge pump, the lower the differential

DMOS, so higher dissipating power.

Schottky diodes (for example BAT47 are recommended).

Sharing the same charge pump circuitry for more than 3 or 4 devices is not recommended,

power dissipation.

Figure 8.

Sharing the charge pump circuitry

2.8

How to generate a reference voltage for the current control

The device has an analog input (CP-) connected to the internal comparator, that can be

used to control the peak value of the motor current through an external control loop.

A fixed reference voltage can be easily obtained with a resistive divider from an available

pull-up voltage rail (maybe the one supplying the microcontroller or the rest of the

application) and GND.

A very simple way to obtain a variable voltage without using a DAC is to low-pass filter a

PWM output of a µC (Figure 9).

L6230

CP

D1

D2

Cboot2

Cfly1

To High - Side

L6230

Cboot1

To High - Side

To other Devices

L6230

CP

AM16570v1