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 292 Page Street Suite D Stoughton, MA 02072 USA T: (781) 344-8226 F: (781) 344-8481 E: [email protected] W: www.micropowerdirect.com Max. 36.0 38.0 50 Units VDC VDC VDC mS Max. 48 Units VDC 7.6 Internal Capacitor 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) MicroPower Direct Typ. 24.0 0.1 Sec. Max Capacitive Load Models Available with Wire Leads (IP67 Rated) Min. 9.0 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 Conditions Min. Typ. 14 VOUT - VIN = ⱖ5V 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 % µF kHz ±0.03 Natural Convection +17 Output Current Cut-Off, Auto Recovery Conditions Min. Typ. See Model Selection Guide -55 Free Air Convection RH, Non-condensing 1.5 mm From Case For 10 Sec %/ºC ºC/W Max. Units +102 +125 ºC ºC 95 260 % 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. EN = ⱕ3V VIN = 9 to 32V VIN = 32V to 36V Conditions At DIM Input ON Off VDIM = 0.40 to 1.7V Conditions Recommended Maximum 1.5 1.3 8.0 Units Open 0.0V µA mA Min. 0.4 0.4 0.0 0.0 Typ. Max. 5.0 1.7 100 0.30 1.5 Units VDC VDC % VDC µA Min. 0.100 0.40 0.00 Typ. Max. 100 5.0 0.30 Units kHz VDC VDC Radiated/Conducted Conditions MIL HDBK 217F, 25ºC, Gnd Benign Max. EN 55022 (CISPR22) Class B Min. 1.29 Typ. www.micropowerdirect.com 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 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 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 application 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 damage 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 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 VC) 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 (IOUT 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 (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. Mechanical Dimensions PWM Dimming Pin Connections Pin Function 1 2 3 4 5 6 +VIN +DC Supply DIM PWM/Analog Dimming EN On/Off Control -VIN -DC Supply +LED LED Anode Conn. -LED LED Cathode Conn. Notes: • All dimensions are typical in inch inches (mm) • Tolerance x.xx = ±0.02 (±0.50) 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 “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 such as a typical microcontroller output. PWM Dimming Signals MicroPower Direct 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]