Circuit description
UM1943
18/28
DocID028304 Rev 1
4
Circuit description
4.1
Power section
– L6230 driver with integrated three-phase
bridge
The main section is based on the L6230. It is a DMOS fully-configurable driver for three-
phase brushless BLDC/PMSM motors. The supply voltage is provided through an external
connector (J1) and with (J9) jumper settings, it is possible to choose if the digital section
(STM32 Nucleo board) must be supplied by USB or by the expansion board. For these
settings, please refer to
Table 1: "Jumper settings"
.
Figure 13: X-NUCLEO-IHM07M1
– power section
The L6230 integrates a three-phase bridge which consists of six power MOSFETs. Using
the N-channel power MOSFET for the upper transistors in the bridge requires a gate drive
voltage above the power supply voltage. The bootstrapped supply (VBOOT) is obtained
through an internal oscillator and a few external components to implement a charge pump
circuit as shown in the diagram that follows.