rev. applications features The VLD24-XXX series is a step-down constant current source designed for driving high power LEDs. The available output currents are: 300mA, 350mA, 500mA, 600mA, 700mA. Despite its compact size, the VLD24-XXX series is fully featured with very high efficiency, wide input voltage range, high ambient operating temperature, and two means of LED dimming: PWM digital dimming and analog dimming control, via a trim POT. • • • • • • • • input range (V dc) 5.5~36 5.5~36 5.5~36 5.5~36 5.5~36 VLD24-300 VLD24-350 VLD24-500 VLD24-600 VLD24-700 quiescent input current in off mode input filter output voltage (V dc) 2~32 2~32 2~32 2~32 2~32 output current (mA) 0~300 0~350 0~500 0~600 0~700 1/2009 dimming control PWM+analog PWM+analog PWM+analog PWM+analog PWM+analog conditions/description absolute max before device failure opperating input range Vin = 24V, V DIM < 0.6V min nom 5.5 24 min 2 300 nom max 40 36 400 units VDC VDC μA max 32 700 ±12 ±18 ±0.03 470 units VDC mA % % %/°C μF capacitor OUTPUT parameter voltage range current range current accuracy current stability temp. coefficient maximum capacitive load date power LED driver high efficiency up to 95% wide input voltage range constant current output PWM digital dimming short-circuit protection analog dimming output on/off control INPUT parameter input voltage 1 of 4 DESCRIPTION: constant current dc-dc converter PART NUMBER: VLD24-XXX model page conditions/description Vin is at least 1.5~4V higher than Vout Vin-Vout > 1.5~4V 300~700mA Vin = 24V, Vout = 2~32V -40°C ~ 71°C ambient ±8 ±10 PROTECTION CIRCUIT parameter conditions/description short-circuit protection regulated at rated output current 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 efficiency (%) 95 95 95 95 95 rev. page 2 of 4 date 1/2009 DESCRIPTION: constant current dc-dc converter PART NUMBER: VLD24-XXX DIMMING AND CONTROL parameter remote on/off remote pin current PWM frequency conditions/description dc-dc ON (Vr on pin3) dc-dc OFF Vr = 5V min nom max open or 2.8V<Vr<6V Vr <0.6V 1 0.2 10 units conditions/description 300/350mA 500/600/700mA min -40 -40 -55 max 85 71 125 100 units ºC ºC ºC °C 95 g % mA kHz GENERAL parameter ambient temp. storage temp. max. case temp. RoHS case material dimensions weight efficiency nom yes plastic (UL94V-0) 22.8 x 10.2 x 9.5 (L x W x H) 3.5 at full load DIGITAL DIMMING CONTROL 50% Duty Cycle Output current 80% Duty Cycle Output current(LED appears brighter) 20% Duty Cycle Output current(LED appears dimmer) 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. page 3 of 4 date 1/2009 DESCRIPTION: constant current dc-dc converter PART NUMBER: VLD24-XXX ANALOG DIMMING CONTROL A 1 +Vin 6 VLD24-XXX Cin 5 G ND RW 4 1 st LED 3 2 La st LED POT Dim ON /OFF /PWM Cin = 47μF for best performance Io can be set between 0A and Io(max) with trim pot Rw. For example, to set the output current (Io) to 200mA using the VLD24-350, choose Rw=0.4Ω. The trim pot should be placed close to pins 1 and 2 with shortest possible leads. 0.75 0.703 0.657 Io_300w 0.61 0.563 Io_350w0.517 0.47 Io_500w0.423 0.377 Io_600w 0.33 0.283 Io_700w 0.237 0.19 0.143 0.097 0.05 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 Rw TYPICAL APPLICATION CIRCUITS 1 +Vin Cin VLD24-XXX GND RW 2 6 VLD24-XXX Cin 5 4 1 +Vin 6 1st LED GND 3 4 RW 5 2 1st LED 3 La st L ED POT Dim La st L ED POT Dim ON/ OFF /PWM Figure 1a. Series Configuration ON/ OF F /PWM Figure 1b. Parallel Configuration EMS FILTER CIRCUITS 1 700 µ H * 2 + Vin 1 µF Cera mic G ND 2 .2 µF Fi ter2 T Ce ra mic 6 VLD24-XXX 5 4 2 1s t LED 3 Las t LED ON/OFF/PWM 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 Ω rev. page 4 of 4 date 1/2009 DESCRIPTION: constant current dc-dc converter PART NUMBER: VLD24-XXX MECHANICAL DRAWING AND PIN-OUT 10.20 (0.401) 9.00(0.354) 0.50(0.020) 22.80(0.897) FOOTPRINT DETAILS Pin 1 4.10(0.161) 17.78(0.700) 5 4 3 Bottom View 2 6 1 7.62 (0.300) 2 3 4 5 RECOMMENDED FOOTPRINT Top view,grid:2.54mm(0.1inch), diameter:1.00mm (0.039inch) 6 Function Vin Analog Dim ON/OFF/PWM GND Comments DC Supply Set Output Current Output enable/PWM -Vout Do not connect to -Vout LED Cathode connection +Vout LED Anode connection Note: Unit:mm(inch) Pin diameter:0.50mm(0.020inch) Pin tolerances: +0.10mm( +0.004inch) General tolerances: +0.25mm( +0.010inch) 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382