DCDC
Specification
LED Driver
• Constant Current Output
• LED Drive Current up to 1000 mA
• LED Strings from 2 V to 57 V
• PWM & Analog Dimming Control
•
High Efficiency up to 95%
• Open or Short Circuit LED Protection
• 3 Year Warranty
LDU Series
Input
Input Voltage • LDU08 & 24: 7-30 VDC
LDU48: 7-60 VDC
Input Filter • Capacitor
Input Surge • LDU08 & 24: 40 VDC for 0.5 s
LDU48: 65 VDC for 0.5 s
Output
Output Voltage • See tables
(Vin must be at least 2 V greater than Vout)
Output Current • See tables
Output Current Trim • 25-100%
Output Current • LDU08: ±6.0% max
Accuracy LDU24: ±8.0% max
LDU48: ±8.0% max
Ripple & Noise • LDU08: 200 mV pk-pk max
LDU24: 250 mV pk-pk max
(except 1000 mA units: 300mVpk-pk max)
LDU48: See tables
measured with 20 MHz bandwidth
Short Circuit Protection • Current is limited to the rated output
Temperature • LDU08: ±0.03%/°C max
Coefficient LDU24: ±0.08%/°C max
LDU48: ±0.03%/°C max
Remote On/Off • On = 0.3-1.25 V or open circuit
Off = ≤0.15 V (applied to control pin)
LDU08 & 24: Quiescent input current is
25 µA max,
LDU48: Quiescent input current is
100 µA max
Remote On/Off Signal • 1 mA max
Current
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%
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General
Efficiency • See tables
Switching Frequency • LDU08: 40-380 kHz variable
LDU24: 50-330 kHz variable
LDU48: 20-500 kHz variable
MTBF • LDU08: >1.6 MHrs
LDU24: >1.6 MHrs
LDU48: >950 KHrs
to MIL-HDBK-217F at 25 °C, GB
Environmental
Operating Temperature • LDU08: -40 °C to +85 °C,
LDU24: -40 °C to +85 °C,
LDU24 1000 mA unit: -40 °C to +70 °C,
LDU48: See derating curves
Case Temperature • LDU08 & 24: +100 °C max
LDU48: +110 °C max
Storage Temperature • -40 °C to +125 °C
Humidity • Up to 95%, non-condensing
Thermal Impedance • 35-50 °C/W model dependant
Ingress Protection • IP67 (wired versions)
Rating
EMC
Emissions • EN55022 class B conducted & radiated
with external components - see
application notes
ESD Immunity • EN61000-4-2, level 2 Perf Criteria A
Radiated Immunity • EN61000-4-3, level 2 Perf Criteria A
EFT/Burst • EN61000-4-4, level 2 Perf Criteria A
Surge • EN61000-4-5, level 2 Perf Criteria A
Conducted Immunity • EN61000-4-6, level 2 Perf Criteria A