LD24E-xx-xxx SSeries 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 Conditions Input Voltage Range Max Input Voltage Min. Typ. Max. Units 5.5 24.0 36.0 VDC 40.0 VDC Max. Units 32 VDC See Note 1 Input Filter Internal Capacitor • Wide 5.5V to 36V Input Range Output • Efficiency to 95% Parameter Conditions Min. Typ. • Miniature Case Output Voltage Range • 4.7 MHrs MTBF Output Current • Low, Low Cost! Output Current Accuracy Vin = 24V ±5.0 ±8.0 % Output Current Stability Vin = 24V ±5.0 ±10.0 % 470 µF Vin = 36V 2 See Model Selection Guide Output Capacitive Load Efficiency Iout = 100% Temperature Coefficient Output Short Circuit 95 % ±0.03 %/ºC Units Regulated At Rated Output Current Environmental Parameter Conditions Operating Temperature Range, Ambient Min. Typ. Max. 300 mA, 350 mA Output Models -40 +25 +85 All Other Models -40 +25 +71 Operating Temperature Range, Case Case Storage Temperature Range -55 Cooling ºC +100 ºC +125 ºC Free Air Convection Humidity Lead Temperature RH, Non-condensing 95 % 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 MicroPower Direct 292 Page Street Suite D Stoughton, MA 02072 USA T: (781) 344-8226 F: (781) 344-8481 E: [email protected] W: www.micropowerdirect.com Conditions Min. Typ. Max. Units DC/DC On Open 0r 2.8V < Vcont <6.0V DC/DC Off Vcont <0.6V Remote Pin Drive Current Quiescent Input Current (Shutdown Mode) Vcont = 5.0V Vin = 24V, Vcont = <0.6V 1 mA 400 µA Max. Units 10 kHz PWM Dimming Parameter Conditions Operation Frequency Min. Typ. 0.2 Reliability Specifications Parameter MTBF Safety Standards Conditions MIL HDBK 217F, 25ºC, Gnd Benign Min. Typ. 2.0 Max. Units MHours Meets EN 60950, IEC 60950 www.micropowerdirect.com 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) Output Voltage Current (mA) 0.0 - 300 0.0 - 350 0.0 - 500 0.0 - 600 0.0 - 700 Nominal Range (VDC) 24 24 24 24 24 5.5 - 36.0 5.5 - 36.0 5.5 - 36.0 5.5 - 36.0 5.5 - 36.0 2.0 - 32.0 2.0 - 32.0 2.0 - 32.0 2.0 - 32.0 2.0 - 32.0 Dimming Control Efficiency (%, Max) PWM PWM PWM PWM PWM 95 95 95 95 95 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 (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 PWM Output Current Control Mechanical Dimensions Pin Function 1 3 4 5 6 +VIN +DC Supply PWM PWM, On/Off Gnd -DC Supply -VOUT LED Cathode Conn. +Vout LED Anode Conn. Output current may be adjusted by using a pulse width modulated (PWM) signal. By varying 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 MicroPower Direct 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 We Power Your Success - For Less! 292 Page Street Ste D Stoughton, MA 02072 • TEL: (781) 344-8226 • FAX: (781) 344-8481 • E-Mail: [email protected]