UM0969 datasheet(16/46 Pages) STMICROELECTRONICS

16 / 46 page

Board description

UM0969

16/46

Doc ID 17665 Rev 2

The op amp is used in follower mode and its gain can be set by resistor r and R:

Equation 6

VOUT (op amp output voltage) can be calculated as a sum of two components:

●

VBIAS: due to network polarization

●

VSIGN: the signal component

Equation 7

VOUT maximum value is 3.3 V according to the MCU input maximum rating.

Equation 8

Equation 9

With the default values:

●

G = 12

●

VBIAS = 0.3 V

●

Maximum current amplifiable without distortion is 5 A

It is possible to modify the maximum current value by simply changing the resistor values.

2.3.6

Tachometer and Hall/encoder input

Both the tachometer and Hall/encoder inputs have been implemented on the STEVAL-

IHM027V1. In the case of using a Hall or encoder sensor, the W1, W3, and W7 jumpers

must be connected and the W8 jumper disconnected. The W5 jumper set in position A

allows any connected Hall sensor to be supplied with the same supply voltage of the MCU

(+3.3 VDC or +5 VDC depend on the W1 jumper). Setting the W12 jumper to position B

supplies the Hall sensor directly with +5 VDC, which is the most common voltage for a Hall

sensor. In the case of using a tachometer, the W1, W3, and W7 jumpers must be

disconnected and the W8 jumper connected. This type of adjustable feature allows for the

testing and evaluating of motors with a wide spectrum of various sensors.

2.3.7

Temperature feedback and overtemperature protection (OTP)

The STGIPS10K60A integrates an NTC for temperature monitoring purposes. A simple

voltage divider is realized with the internal NTC (see Table 2 for NTC details) and resistor

R56. The temperature monitoring signal is sent to the MCU through J3 connector (pin 26

HEATSINK TEMPERATURE) and can be read with an AD converter.

BIAS

SIGN

OUT

)]

[

BIAS

⋅

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

⋅

)

(

)

((

VSIGN

⋅

UM0969 датащи(PDF) 16 Page - STMicroelectronics

UM0969 датащи(HTML) 16 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46

датащи скачать

ссылки URL