L6230

Circuit description

Doc ID 18094 Rev 2

11/24

5

Circuit description

5.1

Power stages and charge pump

The L6230 integrates a three-phase bridge, which consists of 6 power MOSFETs connected

as shown on the block diagram (see Figure 1), each power MOS has an

internal timing circuit between the turn off and turn on of two power MOSFETs in one leg of

a bridge.

Using N-channel power MOS for the upper transistors in the bridge requires a gate drive

through an internal oscillator and few external components to realize a charge pump circuit

as shown in Figure 6. The oscillator output (pin VCP) is a square wave at 600 kHz (typically)

with 10 V amplitude. Recommended values/part numbers for the charge pump circuit are

shown in Table 7.

Figure 6.

Charge pump circuit

Table 7.

Charge pump external component values

Component

Value

220 nF

10 nF

D1

1N4148

D2

1N4148

D2

D1

VCP

VBOOT