MicroPower Direct

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292 Page Street Ste D Stoughton, MA 02072

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TEL: (781) 344-8226

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FAX: (781) 344-8481

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E-Mail: sales@micropowerdirect.com

Notes:

Connection Notes:

class B. With the addition of the filter, the unit should also meet the levels of EN 55015. Component values may need to be

changed slightly depending upon application variables.

2. To comply with EN61000-4-5, a TVS should be installed before the input filter components. The TVS max clamping voltage

38V.

3. As shown in the graph (Output Current vs DIM Input Voltage) above, the output current of the unit can be set by adjusting the

Care must be taken not to exceed 5.0V on this input, or the driver may be damaged. In the circuit above, the voltage level at

Analog Dimming

Output Current vs DIM Input Voltage

Model

Number

Input

Output

Max.

Power

(W)

Ripple &

Noise

(mV P-P, Max)

Efficiency

At FL (%)

Operating

Temp. Range

Voltage

Voltage

Current

Min

Max Min (ºC) Max (ºC)

LDB24-07-150

9.0 - 36.0

14.0 - 48.0

150

7.2

350

86

91

-40

+85

LDB24-12-250

9.0 - 18.0

14.0 - 48.0

250

12.0

450

89

93

-40

+80

18.0 - 36.0

-40

+85

LDB24-14-300

9.0 - 18.0

14.0 - 48.0

300

14.4

450

89

94

-40

+80

18.0 - 36.0

-40

+85

LDB24-16-350

9.0 - 18.0

14.0 - 48.0

350

16.8

600

89

94

-40

+75

18.0 - 36.0

-40

+85

LDB24-24-500

9.0 - 18.0

14.0 - 45.0

500

24.0

650

90

95

-40

+70

18.0 - 36.0

23.0 - 48.0

-40

+80

LDB24-28-600

9.0 - 18.0

14.0 - 38.0

600

28.8

650

91

95

-40

+70

18.0 - 36.0

23.0 - 48.0

-40

+75

LDB24-33-700

9.0 - 18.0

14.0 - 32.0

700

33.6

700

91

95

-40

+70

18.0 - 36.0

23.0 - 48.0

-40

+75

Model Selection Guide

Mechanical Dimensions

www.micropowerdirect.com

Notes:

NOTES:

1. These are “step-up” devices. The output must be kept 5.0V

higher than the input. Excessive heating could occur if it is not.

2. A reversed power source could damage the unit.

3. No connection should be made between input ground and the

output.

4. The driver has an under voltage shutdown feature that can be

used to automatically turn the driver off when a preset input

voltage level is reached. This could be useful in applications

where a battery supplies the input bus voltage. This connection

is illustrated in the connection diagram below.

5. Unless output ripple needs to be reduced for a specific ap-

plication requirement, capacitance should not be added to the

output of the driver. Adding ouput capacitance will delay the

start of the unit.

6. Maximum operating temperature is given for ambient, with

convection cooling.

7. Exceeding 8V for more than 0.1S on the DIM input may damge

the unit.

8. Exceeding the specified maximum output power could cause dam-

age to the unit.

9. The remote on/off input (pin 3) should be left open if not used.

PWM Dimming

Pin Connections

Pin

Function

+DC Supply

2

DIM

PWM/Analog Dimming

3

EN

On/Off Control

-DC Supply

5

+LED

LED Anode Conn.

6

-LED

LED Cathode Conn.

Connection Notes:

1. Output current can also be adjusted by using a pulse

width modulated (PWM) signal. By varying the signal

duty cycle (as shown at right) the on time of the LED

is varied. This changes the apparent brightness of the

LED, because the human eye will “average” the amount

of light in the pulsed output. To avoid visible flicker, the

PWM signal should be greater than 100 Hz (>200 Hz

is recommended).

2. The pulse amplitude of the PWM signal should not be

set to a level that produces a peak output current level

that exceeds the rated operating current of the LED’s

will provide the optimum drive current for the LED lamps. This level can be approximated from the graph above right.

amplitude spikes that may be caused by the collector-emitter capacitance

of the transistor. These could cause errors in the driver output current or

erratic operation. The DIM input can also be driven by an open drain source

such as a typical microcontroller output.

PWM Dimming Signals