LDM12 datasheet(4/2 Pages) MPD

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Notes:

• All dimensions are typical in inches (mm)

• Tolerance x.xx = ±0.02 (±0.50)

• Pin 1 is marked by a “dot” or indentation on the top of the unit

Mechanical Dimensions

Analog Output Current Control (VCNT = 5V)

In the second circuit, the 5 VDC regulator

(SR2) is replaced by the shunt regulator (D1)

circuit connected in parallel with the resis-

tor network. The regulator will maintain

the voltage across R2 and R3 at 2.5 VDC,

insuring that the 1.25 VDC limit on the VADJ

pin will not be exceeded.

When using the analog control input, the

nominal output current is equal to:

125

NOM

MAX

ADJ

The VADJ input should be left open if not

used. Grounding VADJ will shut the unit

down. Connecting VADJ to directly to +VIN

may damage the unit.

Analog Output Current Control (5 - 16 VDC IN)

Pin Connections

Function

1+VIN

+DC Supply

+LED

LED Anode Conn.

-LED LED Cathode Conn.

7VADJ

PWM, On/Off

8-VIN

-DC Supply

The output current of the unit can also

be set by adjusting the voltage level on

the VADJ input to a value between 0.3V to

1.25V (IOUT will vary from 25% to 100% of

rated output current). Care must be taken

not to exceed 1.25V on this input, or the

driver may be damaged.

A simple analog circuit using two low

cost, switching regulators is shown at

left. Working from inputs that can range

from 20 to 32 VDC,the top regulator

(SR1) keeps the input to the LED driver

at 15 VDC.

The other regulator (SR2), driven off the same input line maintains

the control voltage (for the VADJ input) at 5 VDC. The resister

network of R1 and R2 can now be used to set the output current

level of the LED driver. This level is equal to:

ADJ

CTRL

Get a full explanation of the

circuits in this datasheet and

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