Witura WT-9001 IP65 Dokumentacja Pobierz pdf (Strona 28)

2.2.1.3 Operation of Internal Circuit.

a) Digital Transistor Inputs

The ULN2003A is monolithic high-voltage, high-current Darlington

transistor arrays. Each consists of seven NPN Darlington pairs that feature high-

voltage outputs with common-cathode clamp diodes for switching inductive

loads. The collector-current rating of a single Darlington pair is 500mA.

The Darlington pairs may be paralleled for higher current capability.

Applications include relay drivers, hammer drivers, lamp drivers, display drivers

(LED and gas discharge), line drivers, and logic buffers. The ULN2003A has a

2.7kΩ _series base resistor for each Darlington pair for operation directly with

TTL or 5-V CMOS devices.

Figure 2.7 Schematic Diagram Digital Transistor Inputs

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 81 82

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Witura WT-9001 IP65 Dokumentacja Strona 28