AN2983 datasheet(5/32 Pages) STMICROELECTRONICS

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AN2983

Main characteristics

Doc ID 15679 Rev 1

5/32

1.3

Interface

Ideally the module should have only two pins and behave as a constant current sink, but for

practical reasons, and in order to gain a higher degree of flexibility, its connector has the

following pinout.

●

D_Dimm is a digital (TTL) input for the module. A high level shuts off the circuit. A low

level enables the nominal load current and a square wave with variable duty cycle can

be used as a dimming control

●

C_Set is an analog input (0...12 V). A voltage applied to this pin is used to set the load

current to the required value

●

Gnd pins 3 and 4 are the ground return for the controller’s power supply (Vcc). D_Dimm

and C_set are referred to this ground

●

Vcc is the connection to the controller’s power supply input

●

Vin_Gnd is the main power supply return, internally connected to the Gnd pins

●

Vin is the main power supply input (48 V)

●

LEDs_A is the connection to the anode of the diode string

●

LEDs_K is the connection to the cathode of the diode string

Table 1.

EVL6562A-LED interface

Pin number

Signal name

Connection

Notes

D_Dimm

Shutdown / digital dimming

Digital input

C_Set

Load current setting

0.. 12 V input

Gnd

Auxiliary power (Gnd)

Gnd

Auxiliary power (Gnd)

Vcc

Auxiliary power (Vcc)

(18 V) input/output

6n.c.

Vin_Gnd

Main power (Gnd)

Vin

Main power (Vin)

(48 V nom.) input

LEDs_A

LEDs anode Interconnection

Output

LEDs_K

LEDs cathode interconnection

Output

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