13

4530H–BCD–09/09

T6818

10. Application Circuit

10.1

Application Notes

It is strongly recommended to connect the blocking capacitors at V

ble to the power supply and GND pins.

Recommended value for capacitors at V

Electrolytic capacitor C > 22 µF in parallel with a ceramic capacitor C = 100 nF. Value for elec-

trolytic capacitor depends on external loads, conducted interferences and reverse conducting

current I

Recommended value for capacitors at V

Electrolytic capacitor C > 10 µF in parallel with a ceramic capacitor C = 100 nF. To reduce ther-

mal resistance it is recommended to place cooling areas on the PCB as close as possible to the

GND pins. Negative spikes at the output pins (e.g. negative spikes caused by an inductive load

switched off with a high side driver) may activate the overtemperature protection function of the

T6818. In this condition, all outputs will be switched off simultaneously. If this behavior is not

acceptable or compatible with your application functionally, it is necessary, that for switching on

required outputs again, the SRR bit (Status Register Reset) is set, to ensure a reset of the over-

temperature function.

DI

CLK

INH

DO

CS

UV

protection

Serial interface

Input register

Output register

H

S

3

L

S

3

H

S

2

L

S

2

H

S

1

L

S

1

S

R

R

O

C

S

n.

n.

n.

n.

n.

n.

P

S

F

O

P

L

S

C

D

n.

u.

H

S

3

L

S

3

H

S

2

L

S

2

H

S

1

L

S

1

T

P

OUT3

VS

VCC

Thermal

protection

Control

logic

Power-on

reset

Charge

pump

OUT2

OUT1

n.

n.

u.

GND

n.

u.

n.

u.

n.

u.

n.

u.

n.

u.

u.

u.

u.

u.

u.

u.

u.

3

11

1

7

8

14

212

13

5

6

4

10

9

GND

GND

GND

Fault

detect

Fault

detect

Fault

detect

Fault

detect

Fault

detect

Fault

detect

5 V

13 V

BYT41D

V

S

V

Batt

U5021M

Watchdog

V

CC

Enable

MM

V

CC

V

CC

V

CC