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LDM24

更新时间： 2022-02-26 09:39:25

品牌	Logo	应用领域
MPD		/
页数	文件大小	规格书
4页	607K
描述
LDM24-xx-xxx

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LDM24 数据手册

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Analog Output Current Control (VCNT = 5V)

www.micropowerdirect.com

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:

R₂

+

V

ADJ

X V

CTRL

=

R₁R₂

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.

Analog Output Current Control (5 - 30 VIN)

When using the analog control input, the

nominal output current is equal to:

V

1.25

ADJ

I

_NOM=I_MAX

x

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.

Mechanical Dimensions

Pin Connections

Pin

1

Function

-VIN

-DC Supply

2

V^ADJ

PWM, On/Off

7

-LED LED Cathode Connection

+LED LED Anode Connection

8

14

+V^IN

+DC Supply

Get a full explanation of the

circuits in this datasheet and

more in “Driving LEDs”.

Available free at the MPD website

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

MicroPower Direct

We Power Your Success - For Less!

292 Page Street Ste D Stoughton, MA 02072

•

TEL: (781) 344-8226

•

FAX: (781) 344-8481

•

E-Mail: sales@micropowerdirect.com

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