L6235PD datasheet(7/35 Pages) STMICROELECTRONICS

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L6235

Pin connections

Package

Name

Type

Function

SO24/

PowerDIP24

PowerSO36

Pin no.

6, 7, 18, 19

1, 18, 19, 36

GND

Ground terminals. On PowerDIP24 and SO24

packages, these pins are also used for heat dissipation

toward the PCB. On PowerSO36 package the slug is

connected on these pins.

822

TACHO

Open drain

output

Frequency-to-voltage open drain output. Every pulse

from pin H1 is shaped as a fixed and adjustable length

pulse.

RCPULSE

RC pin

RC network pin. A parallel RC network connected

between this pin and ground sets the duration of the

monostable pulse used for the frequency-to-voltage

converter.

SENSEB Power supply

Half-bridge 3 source pin. This pin must be connected

together with pin SENSEA to power ground through

a sensing power resistor. At this pin also the inverting

input of the sense comparator is connected.

FWD/REV

Logic input

Selects the direction of the rotation. HIGH logic level

sets forward operation, whereas LOW logic level sets

reverse operation.

If not used, it has to be connected to GND or +5 V.

Logic input

Chip enable. LOW logic level switches OFF all Power

MOSFETs. If not used, it has to be connected to +5 V.

VREF

Logic input

Current controller reference voltage.

Do not leave this pin open or connect to GND.

BRAKE

Logic input

Brake input pin. LOW logic level switches ON all high-

side Power MOSFETs, implementing the brake

function. If not used, it has to be connected to +5 V.

VBOOT

Supply

voltage

Bootstrap voltage needed for driving the upper Power

MOSFETs.

OUT3

Power output

Output 3.

VSB

Power supply

Half-bridge 3 power supply voltage. It must be

connected to the supply voltage together with pin VSA.

VSA

Power supply

Half-bridge 1 and half-bridge 2 power supply voltage. It

must be connected to the supply voltage together with

pin VSB.

OUT2

Power output

Output 2.

VCP

Output

Charge pump oscillator output.

Sensor input

Single ended hall effect sensor input 2.

Sensor input

Single ended hall effect sensor input 3.

Table 4. Pin description (continued)

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