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.
Input
Key Features:
Parameter Conditions Min. Typ. Max. Units
· 300 - 700 mA Output Current
Input Voltage Range 5.5 24.0 36.0 VDC
· Constant Current Output
Max Input Voltage See Note 1 40.0 VDC
· PWM Dimming
Input Filter Internal Capacitor
· Wide 5.5V to 36V Input Range Output
· Efficiency to 95% Parameter Conditions Min. Typ. Max. Units
· Miniature Case Output Voltage Range Vin = 36V 2 32 VDC
· 4.7 MHrs MTBF Output Current See Model Selection Guide
· Low, Low Cost! Output Current Accuracy Vin = 24V ±5.0 ±8.0 %
Output Current Stability Vin = 24V ±5.0 ±10.0 %
Output Capacitive Load 470 µF
Efficiency Iout = 100% 95 %
Temperature Coefficient ±0.03 %/ºC
Output Short Circuit Regulated At Rated Output Current
Environmental
Parameter Conditions Min. Typ. Max. Units
300 mA, 350 mA Output Models -40 +25 +85
Operating Temperature Range, Ambient ºC
All Other Models -40 +25 +71
Operating Temperature Range, Case Case +100 ºC
Storage Temperature Range -55 +125 ºC
Cooling Free Air Convection
Humidity RH, Non-condensing 95 %
Lead Temperature 1.5 mm From Case For 10 Sec 260 ºC
Physical
Case Size 0.90 x 0.40 x 0.374 Inches (22.80 x 10.20 x 9.50 mm)
Case Material Non-Conductive Black Plastic (UL94-V0)
Weight 0.123 Oz (3.5g)
Remote On/Off Control
Parameter Conditions Min. Typ. Max. Units
DC/DC On Open 0r 2.8V < Vcont <6.0V
MicroPower Direct DC/DC Off Vcont <0.6V
292 Page Street
Remote Pin Drive Current Vcont = 5.0V 1 mA
Suite D
Stoughton, MA 02072 Quiescent Input Current (Shutdown Mode) Vin = 24V, Vcont = <0.6V 400 µA
USA PWM Dimming
Parameter Conditions Min. Typ. Max. Units
T: (781) 344-8226
F: (781) 344-8481 Operation Frequency 0.2 10 kHz
E: sales@micropowerdirect.com Reliability Specifications
W: www.micropowerdirect.com
Parameter Conditions Min. Typ. Max. Units
MTBF MIL HDBK 217F, 25ºC, Gnd Benign 2.0 MHours
Safety Standards Meets EN 60950, IEC 60950
www.micropowerdirect.com
CompuMess Elektronik GmbH · Lise-Meitner-Str. 4 · D-85716 Unterschleißheim
Telefon (089) 32 15 01 - 0 · Telefax (089) 32 15 01 - 11
info@compumess.de · www.compumess.de · www.netzteile.de
CompuMess Elektronik GmbH · Lise-Meitner-Str. 4 · D-85716 Unterschleißheim
Telefon (089) 32 15 01 - 0 · Telefax (089) 32 15 01 - 11
Model Selection Guide www.micropowerdirect.com
info@compumess.de · www.compumess.de · www.netzteile.de
Specification Notes:
Input Output
1. Exceeding 40V on the unit input could damage the unit.
Model Voltage (VDC) Dimming Efficiency 2. No connection should be made between input ground and the
Number Voltage Current Control (%, Max)
(VDC) (mA) output.
Nominal Range 3. These are step-down devices, the maximum output open voltage
LD24E-07-300 24 5.5 - 36.0 2.0 - 32.0 0.0 - 300 PWM 95 is equal to the input voltage.
4. The PWM/Cont input (Pin 3) should be left open if not used.
LD24E-08-350 24 5.5 - 36.0 2.0 - 32.0 0.0 - 350 PWM 95 5. Exceeding the specified maximum output power could cause damage
LD24E-12-500 24 5.5 - 36.0 2.0 - 32.0 0.0 - 500 PWM 95 to the unit.
LD24E-14-600 24 5.5 - 36.0 2.0 - 32.0 0.0 - 600 PWM 95
LD24E-17-700 24 5.5 - 36.0 2.0 - 32.0 0.0 - 700 PWM 95
Typical Connection:
Connection Notes:
1. In some noise sensitive applications, the addition of the
input filter components (C1, L1 & C2) 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 Function
1 +VIN +DC Supply
3 PWM PWM, On/Off
4 Gnd -DC Supply
5 -VOUT LED Cathode Conn.
6 +Vout LED Anode Conn.
PWM Output Current Control Mechanical Dimensions
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.
Output current may be calculated by the formula:
IOUT = IRATED x DPWM
Where Iout = Required output current
Irated = Full rated output current for the unit
Dpwm = Duty cycle of the control signal
Notes:
MicroPower Direct · 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
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
CompuMess Elektronik GmbH · Lise-Meitner-Str. 4 · D-85716 Unterschleißheim
Telefon (089) 32 15 01 - 0 · Telefax (089) 32 15 01 - 11
info@compumess.de · www.compumess.de · www.netzteile.de