DCDC LED Driver LDU20 Series xppower.com • 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 Input Voltage Input Filter Input Surge General • 7-30 VDC • Capacitor • 40 VDC for 0.5 s Efficiency Switching Frequency MTBF Output Output Voltage Output Current Output Current Trim Output Current Accuracy Ripple & Noise • See tables (Vin must be at least 2 V greater than Vout) • See tables • 25-100% • ±10 • 450 mV pk-pk max, measured with 20 MHz bandwidth Short Circuit Protection • Current is limited to the rated output Temperature • ±0.05%/°C max Coefficient Remote On/Off • On = 0.3-1.25 V or open circuit Off = ≤0.15 V (applied to control pin) Quiescent input current is 25 µA max, Remote On/Off Signal • 1 mA max Current Dimming PWM Output Current Range Operating Frequency On Time Off Time Amplitude • • • • • DC Voltage Control Output Current Range Control Input • 25% to 100% • 0.3 to 1.25 V max Variable Resistor Output Current Range • 25% to 100% 25% to 100% 1 kHz max 200 ns min 200 ns min 1.25 V max • See tables • 70-450 kHz variable • >1.6 MHrs to MIL-HDBK-217F at 25 °C, GB Environmental Operating Temperature Storage Temperature Humidity Thermal Impedance • • • • -40 °C to +70 °C -40 °C to +125 °C Up to 95%, non-condensing 40 °C/W EMC Emissions ESD Immunity Radiated Immunity EFT/Burst Surge Conducted Immunity • EN55022 class B conducted & radiated with external components - see application notes • EN61000-4-2, level 2 Perf Criteria A • EN61000-4-3, level 2 Perf Criteria A • EN61000-4-4, level 2 Perf Criteria A • EN61000-4-5, level 2 Perf Criteria A • EN61000-4-6, level 2 Perf Criteria A 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 20.32 (0.80) 15.24 (0.60) 2.54 (0.10) 5.08 (0.20) 1 2 1 2 7 8 14 10.16 (0.40) Bottom View 7 0.50 (0.02) 6.88 (0.27) 8 Note: Do not connect pin 1 (-Vin) to pin 7 (-Vout) Notes 1. 2. 3. 4. 5. 3.05 (0.12) 5.08 (0.20) 0.50 (0.02) Pin Connections -DC supply PWM/ON/OFF or not used LED cathode connection LED anode connection +DC supply -V Input Control -V Output +V Output +V Input All dimensions are in inches (mm) Weight: 0.006 lbs (2.6 g) approx. Pin diameter: 0.02±0.002 (0.5±0.05) Pin pitch tolerance: ±0.014 (±0.35) Case tolerance: ±0.02 (±0.5) 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 be achieved. Capacitor C is optional for HF noise rejection, recommended value is 0.22 µF. Control Voltage Range: 0.3 V to 1.25 VDC The output current can be determined using the equation: Iout = Iout nom = Rated Max I x Control Voltage The output current is given by: 1.25 Rated Max I x R +Vout (R + 200 k) Control + Where the value of R is between 0 and 2 MΩ, the maximum adjustment range of output current is 25% to 90% (For Vin-Vout <20 VDC) LDU -Vin +Vout Control -Vout 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 A Pulse Width Modulated (PWM) signal with duty cycle DPWM can be applied to the control pin. PWM 5.0V Control LDU -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 + + L1 C1 C2 - +Vout C1 LDU 10 µF C2 47 µF L1 68 µH - Vout 05-Dec-11 DCDC LDU20 Models and Ratings