LDB24-XXX
Compact, Boost
Constant Current
DC/DC LED Drivers
Electrical Specifications
Specifications typical @ +25°C, nominal input voltage & rated output current, unless otherwise noted. Specifications subject to change without notice.
Input
Parameter
Input Voltage Range
•
Constant Current Output
Max Input Voltage
•
Step Up (Boost) Design
Under Voltage Protection
•
Wide 9V to 36V Input Range
Soft Start Time
Input Filter
•
Up to 48V Output
Output
Parameter
•
Efficiency to 95%
Output Voltage Range
•
7 to 32W Output Power
Output Current
•
-40°C to +85°C Operation
Output Current Accuracy
Output Power
•
Digital & Analog Dimming!
Efficiency
Key Features:
Conditions
0.1 Sec. Max
Min.
9.0
Typ.
24.0
7.6
Max.
36.0
38.0
50
Units
VDC
VDC
VDC
mS
Internal Capacitor
Conditions
Min.
Typ.
14
V
OUT
- V
IN
= 5V
See Model Selection Guide
±5
See Model Selection Guide
See Model Selection Guide
150, 250, 300 & 350 mA Models
100
500, 600 & 700 mA Models
47
370
See Model Selection Guide
Max.
48
Units
VDC
%
Capacitive Load
µF
kHz
±0.03
%/
º
C
º
C/W
Models Available
with Wire Leads
(IP67 Rated)
Operating Frequency
Ripple & Noise (20 MHz)
Temperature Coefficient
Thermal Impedance
Output Short Circuit
Environmental
Parameter
Operating Temperature Range, Ambient
Operating Temperature Range, Case
Storage Temperature Range
Cooling
Humidity
Lead Temperature (Solder)
Physical
Case Size
Case Material
Weight
Remote On/Off Control
Parameter
DC/DC On
DC/DC Off
Remote Pin Drive Current
Quiescent Input Current
(Shutdown Mode)
Analog Dimming
Parameter
Absolute Maximum Rating
Control Voltage Range
Output Current Adjustment
Control Voltage Range
Drive Current
PWM Dimming
Parameter
Operation Frequency
On Control Voltage
Off Control Voltage
EMC Compliance
EMI/RFI
Reliability Specifications
Parameter
MTBF
Natural Convection
+17
Output Current Cut-Off, Auto Recovery
Conditions
Min.
Typ.
See Model Selection Guide
Max.
+102
+125
95
260
Units
º
C
º
C
-55
Free Air Convection
RH, Non-condensing
1.5 mm From Case For 10 Sec
%
ºC
2.03 x 1.03 x 0.62 Inches (51.50 x 26.10 x 15.80 mm)
Non-Conductive Black Plastic (UL94-V0)
1.341 Oz (38.0g)
Conditions
Min.
Typ.
Max.
Units
Open
0.0V
µA
mA
Units
VDC
VDC
%
VDC
µA
Units
kHz
VDC
VDC
EN = 3V
V
IN
= 9 to 32V
V
IN
= 32V to 36V
Conditions
At DIM Input
ON
Off
V
DIM
= 0.40 to 1.7V
Conditions
Recommended Maximum
Min.
0.4
0.4
0.0
0.0
Typ.
1.5
1.3
8.0
Max.
5.0
1.7
100
0.30
1.5
Max.
100
5.0
0.30
MicroPower Direct
292 Page Street
Suite D
Stoughton, MA 02072
USA
T:
(781) 344-8226
F:
(781) 344-8481
E:
sales@micropowerdirect.com
W:
www.micropowerdirect.com
Min.
0.100
0.40
0.00
Typ.
Radiated/Conducted
Conditions
MIL HDBK 217F, 25
º
C, Gnd Benign
Min.
1.29
EN 55022 (CISPR22) Class B
Typ.
Max.
Units
MHours
www.micropowerdirect.com
Model Selection Guide
Model
Number
LDB24-07-150
LDB24-12-250
LDB24-14-300
LDB24-16-350
LDB24-24-500
LDB24-28-600
LDB24-33-700
Input
Voltage
Range
(VDC)
9.0 - 36.0
9.0 - 18.0
18.0 - 36.0
9.0 - 18.0
18.0 - 36.0
9.0 - 18.0
18.0 - 36.0
9.0 - 18.0
18.0 - 36.0
9.0 - 18.0
18.0 - 36.0
9.0 - 18.0
18.0 - 36.0
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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.
Output
Operating
Max. Ripple & Efficiency
Temp. Range
At FL (%)
Voltage
Current Power
Noise
(W)
(mV P-P, Max)
Min Max Min
(ºC)
Max
(ºC)
Range
(VDC)
Max
(mA)
14.0 - 48.0
150
7.2
350
86
91
-40
+85
-40
+80
14.0 - 48.0
250
12.0
450
89
93
-40
+85
-40
+80
14.0 - 48.0
300
14.4
450
89
94
-40
+85
-40
+75
14.0 - 48.0
350
16.8
600
89
94
-40
+85
14.0 - 45.0
-40
+70
500
24.0
650
90
95
23.0 - 48.0
-40
+80
14.0 - 38.0
-40
+70
600
28.8
650
91
95
23.0 - 48.0
-40
+75
14.0 - 32.0
-40
+70
700
33.6
700
91
95
23.0 - 48.0
-40
+75
Output Current vs DIM Input Voltage Analog Dimming
Mechanical Dimensions
Connection Notes:
1. The input filter components (C
1
, L
1
, L
2
, T
1
, C
2
& C
3
) are used to meet the conducted emissions requirements of EN 55022
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
(@max peak pulse current V
C
) must be 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
voltage level on the DIM input to a value between 0.4V and 1.7V (I
OUT
will vary from 0% to 100% of rated output current).
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
the DIM input is set by a simple resistor network (R
1
, R
2
, and R
3
). The regulator (Z
1
) will maintain the voltage across R
2
and
R
3
, insuring that the limit on the DIM pin will not be exceeded. The value of R
1
is given for a 24V input.
4. The resistor R
4
is used to set the “undervoltage protection” level (if used). Contact the factory for more information.
PWM Dimming
Pin Connections
Pin
1
2
3
4
5
6
Function
+V
IN
+DC Supply
DIM PWM/Analog Dimming
EN
On/Off Control
-V
IN
-DC Supply
+LED
LED Anode Conn.
-LED
LED Cathode Conn.
Notes:
•
All dimensions are typical in inch (mm)
inches
•
Tolerance x.xx = ±0.02 (±0.50)
MicroPower Direct
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292 Page Street Ste D Stoughton, MA 02072
•
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
being powered. The “V
DIM
” 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 (D
1
, R
2
) 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
such as a typical microcontroller output.
PWM Dimming Signals
TEL: (781) 344-8226
•
FAX: (781) 344-8481
•
E-Mail: sales@micropowerdirect.com
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