STDRIVE102BH datasheet(39/56 Pages) STMICROELECTRONICS

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Application examples

6.1

3-phase brushless motor application with triple shunt current sensing based

on STDRIVE102BH

Figure 28 shows an application example using the STDRIVE102BH to drive a 3-phase motor with triple shunt

configuration. The list of components is summarized in Table 17.

The values reported in Table 17 refer to a generic example. The actual components' values must be chosen in

order to fit the specific application requirements. The value of the resistors on the IGATE, TCC, and VDSTH pins

must be sized according to the specific power stage. The values of the components connected to the operational

amplifiers and the shunt resistors must be sized according to the current rating of the application.

Table 17. List of components

Value

CBRIDGE

220 nF (to be tuned according to current rating of the power stage)

CBULK

470 µF (to be tuned according to current rating of the power stage)

1 µF low ESR to be placed close to the driver

Rsh

According to the current rating of the application (for example 2 mΩ)

Rop, Rf

According to op amp gain (for example 1 kΩ, 15 kΩ: Gain = 15)

Rcp

4.7 kΩ

Rc1, Rc2

According to the CREF threshold (for example 100 kΩ, 7.5 kΩ: VCREF = 230 mV)

Ccp

10 nF / 16 V

RIG1 , RIG2

1% precision, values according to drivers’ current selection

(for example RIG1 = 30 kΩ, RIG2 = 15 kΩ; see Figure 16)

CIG

10 nF /16 V

Rtc1, Rtc2

1% precision, values according to tcc timing selection

(for example Rtc1 = 30 kΩ, Rtc2 = 7.5 kΩ ; see Figure 16)

Ctc

10 nF / 16 V

Rvds1 , Rvds2

1% precision, values according to VDS monitoring threshold

(for example Rvds1 = 220 kΩ, Rvds2 = 15 kΩ: VDSTH = 210 mV)

Cvds

10 nF / 16 V

REN , CEN

According to target disable time

(for example 33 kΩ, 47 nF: tdelay,EN ≈ 1.25 ms )

RFLAG

33 kΩ

CSUPPLY

1 µF low ESR to be placed close to the driver

CLG

4.7 µF / 16 V

CVCC

4.7 µF / 25 V

CVDD

4.7 µF / 16 V

CBOOT

1 µF / 25 V

CFLY

220 nF (according to VM rating)

STDRIVE102BH, STDRIVE102H

Application examples

DS14545 - Rev 1

page 39/56

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