Pin connection

L6227Q

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Table 4.

Pin description

N°

Pin

Type

Function

1, 21

GND

GND

Signal ground terminals.

Power output Bridge B output 1.

11

RC pin

RC network pin. A parallel RC network connected between this pin and

ground sets the current controller OFF-time of the bridge B.

12

Power supply

Bridge B source pin. This pin must be connected to power ground through a

sensing power resistor.

13

Logic input

Bridge B input 1

14

Logic input

Bridge B input 2

15

Analog input

Bridge B current controller reference voltage.

Do not leave this pin open or connect to GND.

16

Bridge B enable. LOW logic level switches OFF all power MOSFETs of bridge

B. This pin is also connected to the collector of the overcurrent and thermal

protection transistor to implement over current protection.

If not used, it has to be connected to +5 V through a resistor.

17

VBOOT

Supply

voltage

Bootstrap voltage needed for driving the upper power MOSFETs of both

bridge A and Bridge B.

19

Power output Bridge B output 2.

20

Power supply

Bridge B power supply voltage. It must be connected to the supply voltage

22

Power supply

Bridge A power supply voltage. It must be connected to the supply voltage

23

Power output Bridge A output 2.

24

VCP

Output

Charge pump oscillator output.

25

Bridge A enable. LOW logic level switches OFF all power MOSFETs of bridge

A. This pin is also connected to the collector of the overcurrent and thermal

protection transistor to implement over current protection.

If not used, it has to be connected to +5 V through a resistor.

26

Analog input

Bridge A current controller reference voltage.

Do not leave this pin open or connect to GND.

27

Logic input

Bridge A logic input 1.

28

Logic input

Bridge A logic input 2.

29

Power supply

Bridge A source pin. This pin must be connected to power ground through a

sensing power resistor.

30

RC pin

RC network pin. A parallel RC network connected between this pin and

ground sets the current controller OFF-time of the bridge A.

31

Power output Bridge A output 1.

1.

Also connected at the output drain of the over current and thermal protection MOSFET. Therefore, it has to be driven

putting in series a resistor with a value in the range of 2.2 k

Ω - 180 kΩ, recommended 100 kΩ.