L6207 datasheet(44/53 Pages) STMICROELECTRONICS

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AN1762 APPLICATION NOTE

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5.4 EVAL6206PD

An evaluation board has been produced to help the evaluation of the device in PowerSO package. It implements

a typical application with several added components. Figure 48 shows the electrical schematic of the board; in

the table below the part list is reported.

CN1, CN2, CN3, CN4 2-poles connector

JP2 to JP5

2-pin jumper

CN5

34-poles connector

750

Ω 0.6W resistor

220nF/100V Ceramic or Polyester capacitor R2, R3, R26

10k

Ω resistor

220nF/100V Ceramic or Polyester capacitor R4, R5

4.7k

Ω resistor

100µF/63V capacitor

R6, R7

50k

Ω trimmer

10nF/100V Ceramic capacitor

R8, R9, R10, R11

0.4

Ω 1W resistor

C5, C8, C10

10µF/16V Capacitor

R12, R19

20k

Ω resistor

C6, C7

100nF Capacitor

R13, R14, R17, R20

2.2k

Ω resistor

C9, C13

68nF Capacitor

R15, R18

750

Ω resistor

C11

100nF Capacitor

R16, R22

Ω trimmer

C12, C15

470pF Capacitor

R23, R21

Ω resistor

C14

2.2nF Capacitor

R24

12k

Ω resistor

Bat46SW Diodes

R25

50k

Ω trimmer

BZX79C5V1 5.1V Zener Diode

L6205N

JP1

3-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. R25

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 EVAL6206PD can drive DC motors and inductive loads, allow-

ing 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, R16 and R22 set the reference voltage separately

for the two bridges, while R14, C9 and R20, 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 R12, R16, R19, R22

should be disconnected, 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 documentation).

Closing JP4 and JP5, R6 and R7 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 R6 and R7, through pins 27 and 29 of CN5. R13, R15, C8, R17, R18, 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 R1, D2. Depending on the

supply voltage, the value of resistor R1 should be changed in order to ensure a correct biasing of D2.

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 R1, D2 should be disconnected). CN2, or pin 1 of CN5,

can also be used to provide a 5V voltage to external circuits (as, for example, the PractiSPIN ST7 board). In this

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