compact, boost constant current dc/dc led drivers input parameter conditions min. typ. max. units input voltage range 9.0 24.0 36.0 vdc max input voltage 0.1 sec. max 38.0 vdc under voltage protection 7.6 vdc soft start time 50 ms input filter internal capacitor output parameter conditions min. typ. max. units output voltage range v out - v in = 5v 14 48 vdc output current see model selection guide output current accuracy ? % output power see model selection guide ef ciency see model selection guide capacitive load 150, 250, 300 & 350 ma models 100 f 500, 600 & 700 ma models 47 operating frequency 370 khz ripple & noise (20 mhz) see model selection guide temperature coef cient ?.03 %/ c thermal impedance natural convection +17 c/w output short circuit output current cut-off, auto recovery environmental parameter conditions min. typ. max. units operating temperature range, ambient see model selection guide operating temperature range, case +102 c storage temperature range -55 +125 c cooling free air convection humidity rh, non-condensing 95 % lead temperature (solder) 1.5 mm from case for 10 sec 260 ? physical case size 2.03 x 1.03 x 0.62 inches (51.50 x 26.10 x 15.80 mm) case material non-conductive black plastic (ul94-v0) weight 1.341 oz (38.0g) remote on/off control parameter conditions min. typ. max. units dc/dc on open dc/dc off 0.0v remote pin drive current en = 3v 1.5 a quiescent input current (shutdown mode) v in = 9 to 32v 1.3 ma v in = 32v to 36v 8.0 analog dimming parameter conditions min. typ. max. units absolute maximum rating at dim input 0.4 5.0 vdc control voltage range on 0.4 1.7 vdc output current adjustment 0.0 100 % control voltage range off 0.0 0.30 vdc drive current v dim = 0.40 to 1.7v 1.5 a pwm dimming parameter conditions min. typ. max. units operation frequency recommended maximum 0.100 100 khz on control voltage 0.40 5.0 vdc off control voltage 0.00 0.30 vdc emc compliance emi/rfi radiated/conducted en 55022 (cispr22) class b reliability speci cations parameter conditions min. typ. max. units mtbf mil hdbk 217f, 25 c, gnd benign 1.29 mhours micropower direct 292 page street suite d stoughton, ma 02072 usa t: (781) 344-8226 f: (781) 344-8481 e: sales@micropowerdirect.com w: www.micropowerdirect.com www.micropowerdirect.com key features: constant current output step up (boost) design wide 9v to 36v input range up to 48v output ef ciency to 95% 7 to 32w output power -40? to +85? operation digital & analog dimming! electrical speci cations speci cations typical @ +25?, nominal input voltage & rated output current, unless otherwise noted. speci cations subject to change without notice. ldb24-xxx models available with wire leads (ip67 rated)
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: sales@micropowerdirect.com notes: all dimensions are typical in inches (mm) tolerance x.xx = ?.02 (?.50) connection notes: 1. the input lter components (c 1 , l 1 , l 2 , t 1 , c 2 & c 3 ) are used to meet the conducted emissions requirements of en 55022 class b. with the addition of the lter, 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 lter components. the tvs max clamping voltage (@max peak pulse current v c ) 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 th e voltage level on the dim input to a value between 0.4v and 1.7v (i out 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 (r 1 , r 2 , and r 3 ). the regulator (z 1 ) will maintain the voltage across r 2 and r 3 , insuring that the limit on the dim pin will not be exceeded. the value of r 1 is given for a 24v input. 4. the resistor r 4 is used to set the ?ndervoltage protection level (if used). contact the factory for more information. analog dimming output current vs dim input voltage model number input output max. power (w) ripple & noise (mv p-p, max) ef ciency at fl (%) operating temp. range voltage voltage current range (vdc) range (vdc) max (ma) min max min (oc) max (oc) ldb24-07-150 9.0 - 36.0 14.0 - 48.0 150 7.2 350 86 91 -40 +85 ldb24-12-250 9.0 - 18.0 14.0 - 48.0 250 12.0 450 89 93 -40 +80 18.0 - 36.0 -40 +85 ldb24-14-300 9.0 - 18.0 14.0 - 48.0 300 14.4 450 89 94 -40 +80 18.0 - 36.0 -40 +85 ldb24-16-350 9.0 - 18.0 14.0 - 48.0 350 16.8 600 89 94 -40 +75 18.0 - 36.0 -40 +85 ldb24-24-500 9.0 - 18.0 14.0 - 45.0 500 24.0 650 90 95 -40 +70 18.0 - 36.0 23.0 - 48.0 -40 +80 ldb24-28-600 9.0 - 18.0 14.0 - 38.0 600 28.8 650 91 95 -40 +70 18.0 - 36.0 23.0 - 48.0 -40 +75 ldb24-33-700 9.0 - 18.0 14.0 - 32.0 700 33.6 700 91 95 -40 +70 18.0 - 36.0 23.0 - 48.0 -40 +75 model selection guide mechanical dimensions www.micropowerdirect.com no t es: all dimensions are typical in inch notes: 1. these are ?tep-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 speci c ap- plication 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 speci ed maximum output power could cause dam- age to the unit. 9. the remote on/off input (pin 3) should be left open if not used. pwm dimming pin connections pin function 1+v in +dc supply 2 dim pwm/analog dimming 3 en on/off control 4-v in -dc supply 5 +led led anode conn. 6 -led led cathode conn. 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 ?verage the amount of light in the pulsed output. to avoid visible icker, 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 ? dim 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 (d 1 , r 2 ) 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
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