L6207 datasheet(39/53 Pages) STMICROELECTRONICS

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AN1762 APPLICATION NOTE

5.3 EVAL6206N

An evaluation board has been produced to help the evaluation of the device in PowerDIP package. It imple-

ments a typical application with several added components. Figure 43 shows the electrical schematic of the

board; in the table below the part list is reported.

CN1, CN2, CN3, CN4 2-poles connector

100

Ω resistor

CN5

34-poles connector

700

Ω 0.6W resistor

220nF/100V Ceramic or Polyester capacitor R3, R4, R16

10k

Ω resistor

220nF/100V Ceramic or Polyester capacitor R5, R6

4.7k

Ω resistor

100µF/63V capacitor

R7, R8

50k

Ω trimmer

10nF/100V Ceramic capacitor

R9, R10, R11, R12, R13, R14 1

Ω 0.4W resistor

C5, C8, C10

10µF/16V Capacitor

R15, R21

2.2k

Ω resistor

C6, C7

47nF Capacitor

R17, R23

20k

Ω resistor

C9, C13

68nF Capacitor

R18, R22

750

Ω resistor

C11

100nF Capacitor

R19, R25

2.2k

Ω resistor

C12, C14

470pF Capacitor

R20, R26

Ω trimmer

C15

2.2nF Capacitor

R27, R24

Ω resistor

D1, D2

1N4148 Diode

R28

12k

Ω resistor

BZX79C5V1 5.1V Zener Diode

R29

50k

Ω trimmer

JP1

3-pin jumper

L6205N

JP2 to JP7

2-pin jumper

L6506

The Evaluation Board provides external connectors for the supply voltage, an external 5V reference for the logic

inputs, four outputs for the motor and a 34-pin connector to control the main functions of the board through an

external µC board or the PractiSPIN tool. The board also accomodate the L6506 PWM current controller. R29

sets the PWM operating frequency. If the L6506 does not need to be used, simply connect the two VREF inputs

to a voltage high enough to keep current control inactive.

The PractiSPIN tool is composed of a graphic interface software running on a PC that connects with the hard-

ware based on the ST7 µC, which contains an upgradeable firmware. This tool allows a fast and easy evaluation

of the PowerSPIN family devices, giving the ability of driving DC, BLDC and Stepper motors, depending on the

target device. The PractiSPIN connected to the EVAL6206N can drive DC motors and inductive loads, allowing

output voltage and current settings

The PC-software also provides a Power Dissipation and Thermal Analysis section, intended to help a fast eval-

uation of the device, package and dissipating copper area required by the user’s application, and to be a good

starting point designing an application (from the power dissipation and thermal point of view).

Running the evaluation board in stand-alone mode, instead, R20 and R26 set the reference voltage separately

for the two bridges, while R19, C9 and R25, C13 are low-pass filters to provide an external reference voltage

by a PWM output of a µC (see also the Microstepping section). Using external VREF inputs R17, R20, R23, R26

can be disconnected through JP6 and JP7, unless the PractiSPIN ST7 evaluation board is used. This board, in

fact, is provided with an offset cancellation circuitry trimmable through a potentiometer (see PractiSPIN docu-

mentation).

Closing JP4 and JP5, R7 and R8 allow adjusting the Over Current Detection threshold separately for the two

full bridges. Leaving JP4 and JP5 opened, the OCD threshold can be programmed providing reference voltages

at the bottom of R7 and R8, through pins 27 and 29 of CN5. R15, R18, C8, R21, R22, C10 provide low-pass

filtering to obtain these reference voltages from an external PWM output of a µC.

Closing JP2 and JP3 allows Over Current Protection to work, connecting each

EN pin to the corresponding OCD

pin.

The 5V voltage for logic inputs and for references (VrefA and VrefB) is obtained from R2, D3. Depending on the

supply voltage, the value of resistor R2 should be changed in order to ensure a correct biasing of D3.

The jumper JP1 allows choosing the 5V voltage from the internal zener diode network or pin 11 of CN5 (for ex-

ample an external µC board can provide 5V to the evaluation board). Also CN2 connector can be used to pro-

vide an external 5V voltage to the board (in that case R2, D3 should be disconnected). CN2, or pin 1 of CN5,

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