LDM24 datasheet(4/4 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 input DC/DC has

been changed to a higher power model,

and the POL regulator is replaced by the

shunt regulator (D1) circuit connected in

parallel with the resistor 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 - 30 VIN)

Pin Connections

Function

1-VIN

-DC Supply

2VADJ

PWM, On/Off

-LED LED Cathode Connection

+LED

LED Anode Connection

+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.

The simple analog circuit at left uses a 15W

DC/DC converter operating off a 12 VDC

input line, to keep the input to the LED

driver at 24 VDC.

The POL regulator, 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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