LED Driver xppower.com LDU20 Series Constant Current Output LED Drive Current up to 700 mA LED Strings from 2 V to 28 V PWM & Analog Dimming Control High Efficiency - up to 95% Open or Short Circuit LED Protection 3 Year Warranty Specification Input General Input Voltage 7-30 VDC Efficiency See tables Input Filter Capacitor Switching Frequency 70-450 kHz variable Input Surge 40 VDC for 0.5 s MTBF >1.6 MHrs to MIL-HDBK-217F at 25 C, GB Output Output Voltage See tables Environmental (Vin must be at least 2 V greater than Vout) Operating Temperature -40 C to +70 C Output Current See tables Storage Temperature -40 C to +125 C Output Current Trim 25-100% Humidity Up to 95%, non-condensing Output Current 10 Thermal Impedance 40 C/W Accuracy Ripple & Noise 450 mV pk-pk max, measured with 20 MHz bandwidth EMC Short Circuit Protection Current is limited to the rated output Emissions EN55022 class B conducted & radiated Temperature 0.05%/C max with external components - see Coefficient application notes Remote On/Off On = 0.3-1.25 V or open circuit ESD Immunity EN61000-4-2, level 2 Perf Criteria A Off = 0.15 V (applied to control pin) Radiated Immunity EN61000-4-3, level 2 Perf Criteria A Quiescent input current is 25 A max, Remote On/Off Signal 1 mA max EFT/Burst EN61000-4-4, level 2 Perf Criteria A Current Surge EN61000-4-5, level 2 Perf Criteria A Conducted Immunity EN61000-4-6, level 2 Perf Criteria A Dimming PWM Output Current Range 25% to 100% Operating Frequency 1 kHz max On Time 200 ns min Off Time 200 ns min Amplitude 1.25 V max DC Voltage Control Output Current Range 25% to 100% Control Input 0.3 to 1.25 V max Variable Resistor Output Current Range 25% to 100% DC-DCDC-DC LDU20 Models and Ratings Output Power Input Voltage Range Output Voltage Output Current Efficiency Model Number 14 W 7-30 V 2-28 V 500 mA 95% LDU2030S500 17 W 7-30 V 2-28 V 600 mA 95% LDU2030S600 20 W 7-30 V 2-28 V 700 mA 95% LDU2030S700 Mechanical Details Pin Connections 20.32 (0.80) 1 -V Input -DC supply 15.2415.24 2 Control PWM/ON/OFF or not used (0.60)(0.60) 7 -V Output LED cathode connection 2.54 10.16 8 +V Output LED anode connection (0.10) (0.40) 14 +V Input +DC supply 0.50 1 2 7 6.88 Note: Do not connect pin 1 (-Vin) to pin 7 (-Vout) (0.02) 5.08 (0.27) Bottom View (0.20) 8 Notes 1. All dimensions are in inches (mm) 2. Weight: 0.006 lbs (2.6 g) approx. 3.05 5.08 3. Pin diameter: 0.020.002 (0.50.05) (0.20) (0.12) 4. Pin pitch tolerance: 0.014 (0.35) 0.50 5. Case tolerance: 0.02 (0.5) (0.02) Application Notes Output Current Adjustment by Variable Resistor Output Current Adjustment by DC Voltage By connecting a variable resistor between Control and GND, simple dimming can Control Voltage Range: 0.3 V to 1.25 VDC be achieved. Capacitor C is optional for HF noise rejection, recommended value is The output current is given by: Iout nom = Rated Max I x Control Voltage 0.22 F. 1.25 Rated Max I x R The output current can be determined using the equation: Iout = +Vout (R + 200 k) Control LDU + -Vin Where the value of R is between 0 and 2 M, the maximum adjustment range of output current is 25% to 90% (For Vin-Vout <20 VDC) +Vout -Vout Control LDU A Control Voltage lower than 0.15 V will turn the output off -Vin C R - Vout Shorting out the Control pin to GND will turn the output off. +Vout Output Current Adjustment by PWM 10K PWM LDU Control 1.25V A Pulse Width Modulated (PWM) signal with duty cycle DPWM can be applied to the control pin. -Vin 0V The output current can be determined using the equation : Iout = Rated Max I x Dpwm GND Dpwm = PWM duty cycle - Vout Input Filter to meet Class B Conducted Emissions + +Vout + L1 C1 10 F LDU C2 47 F - C1 C2 L1 68 H - - Vout 06 Oct 2021