LD24E-xx-xxx
Series
S
Low Cost, PWM Control
Constant Current Output
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.
Key Features:
•
300 - 700 mA Output Current
•
Constant Current Output
•
PWM Dimming
Input
Parameter
Input Voltage Range
Max Input Voltage
Input Filter
Conditions
Vin = 36V
Vin = 24V
Vin = 24V
Iout = 100%
Regulated At Rated Output Current
Conditions
300 mA, 350 mA Output Models
All Other Models
Case
-55
Free Air Convection
RH, Non-condensing
1.5 mm From Case For 10 Sec
95
260
%
ºC
Min.
-40
-40
Typ.
+25
+25
Max.
+85
+71
+100
+125
Units
º
C
º
C
º
C
Conditions
See Note 1
Min.
5.5
Internal Capacitor
Min.
2
Typ.
24.0
Max.
36.0
40.0
Units
VDC
VDC
•
Wide 5.5V to 36V Input Range
Output
•
Efficiency to 95%
Parameter
•
Miniature Case
•
4.7 MHrs MTBF
•
Low, Low Cost!
Output Voltage Range
Output Current
Output Current Accuracy
Output Current Stability
Output Capacitive Load
Efficiency
Temperature Coefficient
Output Short Circuit
Environmental
Parameter
Operating Temperature Range, Ambient
Operating Temperature Range, Case
Storage Temperature Range
Cooling
Humidity
Lead Temperature
Physical
Case Size
Case Material
Weight
Remote On/Off Control
Parameter
DC/DC On
Typ.
Max.
32
Units
VDC
%
%
µF
%
%/
º
C
See Model Selection Guide
±5.0
±5.0
±8.0
±10.0
470
95
±0.03
0.90 x 0.40 x 0.374 Inches (22.80 x 10.20 x 9.50 mm)
Non-Conductive Black Plastic (UL94-V0)
0.123 Oz (3.5g)
Conditions
Min.
Typ.
Max.
Units
Vcont <0.6V
Vcont = 5.0V
Vin = 24V, Vcont = <0.6V
Conditions
Min.
0.2
Conditions
MIL HDBK 217F, 25
º
C, Gnd Benign
Min.
2.0
Typ.
Typ.
1
400
Max.
10
Max.
mA
µA
Units
kHz
Units
MHours
Meets EN 60950, IEC 60950
Open 0r 2.8V < Vcont <6.0V
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
DC/DC Off
Remote Pin Drive Current
Quiescent Input Current
(Shutdown Mode)
PWM Dimming
Parameter
Operation Frequency
Reliability Specifications
Parameter
MTBF
Safety Standards
www.micropowerdirect.com
Model Selection Guide
Model
Number
LD24E-07-300
LD24E-08-350
LD24E-12-500
LD24E-14-600
LD24E-17-700
Input
Voltage
(VDC)
Nominal
24
24
24
24
24
Range
5.5 - 36.0
5.5 - 36.0
5.5 - 36.0
5.5 - 36.0
5.5 - 36.0
Output
Voltage
(VDC)
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Current
(mA)
Dimming
Control
PWM
PWM
PWM
PWM
PWM
Efficiency
(%, Max)
95
95
95
95
95
2.0 - 32.0
2.0 - 32.0
2.0 - 32.0
2.0 - 32.0
2.0 - 32.0
0.0 - 300
0.0 - 350
0.0 - 500
0.0 - 600
0.0 - 700
Specification Notes:
1. Exceeding 40V on the unit input could damage the unit.
2. No connection should be made between input ground and the
output.
3. These are step-down devices, the maximum output open voltage
is equal to the input voltage.
4. The PWM/Cont input (Pin 3) should be left open if not used.
5. Exceeding the specified maximum output power could cause damage
to the unit.
Typical Connection:
Connection Notes:
1. In some noise sensitive applications, the addition of the
input filter components (C
1
, L
1
& C
2
) will help to reduce
conducted emissions.
2. Input gnd (Pin 4) cannot be connected to the output.
3. If not being used, the PWM/Control input (Pin 3) should
be left open.
Typical Connection:
Parallel Output
Connection Notes:
1. A positive temperature coefficient PTC is connected to
each parallel channel for protection.
Pin Connections
Pin
1
3
4
5
6
Function
+V
IN
+DC Supply
PWM
PWM, On/Off
Gnd
-DC Supply
-V
OUT
LED Cathode Conn.
+Vout LED Anode Conn.
PWM Output Current Control
Output current may be
adjusted by using a
pulse width modulated
(PWM) signal. By vary-
ing the signal duty cycle
(as shown at right)
the output current is
adjusted up or down.
Mechanical Dimensions
Output current may be calculated by the formula:
I
OUT
= I
RATED
x D
PWM
Where Iout = Required output current
Irated = Full rated output current for the unit
Dpwm = Duty cycle of the control signal
MicroPower Direct
We Power Your Success - For Less!
292 Page Street Ste D Stoughton, MA 02072
•
Notes:
•
All dimensions are typical in inches (mm)
•
Tolerance x.xx = ±0.01 (±0.25)
•
Pin 1 is marked by a “dot” or indentation on the top of the unit
FAX: (781) 344-8481
•
TEL: (781) 344-8226
•
E-Mail: sales@micropowerdirect.com
Embedded System
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