Model Selection Guide
www.micropowerdirect.com
NOTES:
Input
Voltage
Output
Voltage Current Power
Range (VDC) Range (VDC) Max (mA)
Operating
Efficiency
At FL (%)
Max. Ripple &
1. These are “step-up” devices. The output must be kept 5.±V
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.
Model
Number
Temp. Range
Noise
(W)
(mV P-P, Max)
Min Max Min (ºC) Max (ºC)
LDB24-07-150 9.0 - 36.0 14.0 - 48.0
9.0 - 18.0
150
7.2
350
450
86
91
-40
-40
-40
-40
-40
-40
-40
-40
-40
-40
-40
-40
-40
+85
+80
+85
+80
+85
+75
+85
+70
+80
+70
+75
+70
+75
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.
LDB24-12-250
LDB24-14-300
LDB24-16-350
LDB24-24-500
LDB24-28-600
LDB24-33-700
14.0 - 48.0
14.0 - 48.0
14.0 - 48.0
250
12.0
14.4
16.8
24.0
28.8
33.6
89
93
18.0 - 36.0
9.0 - 18.0
18.0 - 36.0
9.0 - 18.0
18.0 - 36.0
300
350
500
600
700
450
600
650
650
700
89
89
90
91
91
94
94
95
95
95
9.0 - 18.0 14.0 - 45.0
18.0 - 36.0 23.0 - 48.0
9.0 - 18.0 14.0 - 38.0
18.0 - 36.0 23.0 - 48.0
9.0 - 18.0 14.0 - 32.0
18.0 - 36.0 23.0 - 48.0
6. Maximum operating temperature is given for ambient, with
convection cooling.
7. Exceeding 8V for more than ±.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.
Output Current vs DIM Input Voltage Analog Dimming
Connection Notes:
1. The input filter components (C1, L1, L2, T1, C2 & C3) are used to meet the conducted emissions requirements of EN 55±22
class B. With the addition of the filter, the unit should also meet the levels of EN 55±15. Component values may need to be
changed slightly depending upon application variables.
Mechanical Dimensions
2. To comply with EN61±±±-4-5, a TVS should be installed before the input filter components. The TVS max clamping voltage
(@max peak pulse current VC) must be Ϲ38V.
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
voltage level on the DIM input to a value between ±.4V and 1.7V (IOUT will vary from ±% to 1±±% of rated output current).
Care must be taken not to exceed 5.±V on this input, or the driver may be damaged. In the circuit above, the voltage level at
the DIM input is set by a simple resistor network (R1, R2, and R3). The regulator (Z1) will maintain the voltage across R2 and
R3, insuring that the limit on the DIM pin will not be exceeded. The value of R1is given for a 24V input.
4. The resistor R4 is used to set the “undervoltage protection” level (if used). Contact the factory for more information.
PWM Dimming
Connection Notes:
PWM Dimming Signals
1. Output current can also be adjusted by using a pulse
Pin Connections
width modulated (PWM) signal. By varying the signal
duty cycle (as shown at right) the on time of the LED
Pin
1
2
Function
+DC Supply
DIM PWM/Analog Dimming
is varied. This changes the apparent brightness of the
+VIN
LED,because the human eye will“average”the amount
of light in the pulsed output.To avoid visible flicker, the
3
4
EN
-VIN
On/Off Control
-DC Supply
PWM signal should be greater than 1±± Hz (>2±± 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
5
6
+LED
-LED
LED Anode Conn.
LED Cathode Conn.
being powered. The “VDIM” used for the peak amplitude in the circuit above is the control voltage at the DIM input that
will provide the optimum drive current for the LED lamps. This level can be approximated from the graph above right.
3. The DIM input is shown being driven by an open collector transistor. The resistor and diode (D1, R2) supress high
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
Notes:
•
All dimensions are typical in inches (mm)
Tolerance x.xx = ±±.±2 (±±.5±)
MicroPower Direct
such as a typical microcontroller output.
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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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