q q a-xs& a-xs& q q b-xls b-xls series series http://www.microdc.cn technical enquiries-email:tech@microdc.cn tel:0086-20-86000646 page 1 of 2 product product program program part number input output efficiency (%, typ) voltage (vdc) voltage (vdc) current (ma) nominal nominal max qb0303xls 3.3 3.0-3.6 3.3 75.8 62 qb0305xls 5 50 65 qa0505xs 5 4.5-5.5 5 25 62 qa0509xs 9 13.8 64 qa0512xs 12 10.4 66 qa0515xs 15 8.3 65 qb0505xls 5 50 64 qb0509xls 9 27.8 65 qb0512xls 12 20.8 67 qb0515xls 15 16.7 65 qa1205xs 12 10.8-13.2 5 25 62 qa1209xs 9 13.8 63 qa1212xs 12 10.4 64 qa1215xs 15 8.3 65 qb1203xls 3.3 75.8 62 qb1205xls 5 50 65 qb1209xls 9 27.8 66 qb1212xls 12 20.8 67 qb1215xls 15 16.7 66 qa2405xs 24 21.6-26.4 5 25 63 qa2409xs 9 13.8 64 qa2412xs 12 10.4 65 qa2415xs 15 8.3 65 qb2405xls 5 50 63 QB2409XLS 9 27.8 63 qb2412xls 12 20.8 65 qb2415xls 15 16.7 65 qb2424xls 24 10.4 64 model model selection selection q q b b 0 0 5 5 0 0 5 5 x x ls ls product series input voltage output voltage fixed input sip-7 package common common specifications specifications item test conditions min typ max units storage humidity 95 % operating temperature -40 85 storage temperature -55 125 temp. rise at full load 15 25 lead temperature 1.5mm from case for 10 seconds 300 short circuit protection* 1 s cooling free air convection case material plastic (ul94-v0) mtbf 3500 k hours weight 2.1 g *supply voltage must be discontinued at the end of short circuit duration. microdc r eserves the copyright 0.25w, fixed input, isolated&unregulated dual/single output dc-dc converter features features small footprint 1kvdc isolation sip package internal smd construction temperature range: -40 to +85 no heat sink required no external component required industry standard pin out applications applications the q a-xs& q b-xls series are specially designed for applications where a group of polar power supplies are isolated from the input power supply in a distributed power supply system on a circuit board. these products apply to: 1) where the voltage of the input power supply is fixed (voltage variation 10%); 2) where isolation is necessary between input and output (isolation voltage 1000vdc); 3) where the regulation of the output voltage and the output ripple noise are not demanding. such as: purely digital circuits,ordinary low frequency analog circuits, and igbt power device driving circuits.
q q a-xs& a-xs& q q b-xls b-xls series series http://www.microdc.cn technical enquiries-email:tech@microdc.cn tel:0086-20-86000646 page 2 of 2 application application note note requirement on output load to ensure this module can operate efficiently and reliably, during operation, the minimum output load is not less than 10% of the full load, and that this product should never be operated under no load! if the actual output power is very small, please connect a resistor with proper resistance at the output end in parallel to increase the load. overload protection under normal operating conditions, the output circuit of these products has no protection against overload. the simplest method is to connect a self-recovery fuse in series at the input end or add a circuit breaker to the circuit. recommended circuit if you want to further decrease the input/output ripple, an "lc" filtering network may be con n ecte d to the input and output ends of the dc/dc converter, see (figure 1). i t should also be noted that the inductance and the frequency of the "lc" filtering network should be staggered with the dc/dc frequency to avoid mutual interference. however, the capacitance of the output filter capacitor must be proper. if the capacitance is too big, a startup problem might arise. it's not recommended to connect any external capacitor in the application field. output voltage regulation and over-voltage protection circuit the simplest device for output voltage regulation, over-voltage and over-current protection is a linear voltage regulator with overheat protection that is connected to the input or output end in series (figure 2). no parallel connection or plug and play. isolation isolation specifications specifications item test conditions min typ max units isolation voltage tested for 1 minute and 1 ma max 1000 vdc isolation resistance test at 500vdc 1000 m output output specifications specifications item test conditions min typ max units output power 0.25 w line regulation for vin change of 1 % (3.3v input) 1.5 % (others input) 1.2 load regulation 10% to 100% load (3.3v output) 12 20 (5v output) 10.5 15 (9v output) 8.3 15 (12v output) 6.8 15 (15v output) 6.3 15 output voltage accuracy see tolerance envelope graph temperature drift 100% full load 0.03 %/ ripple & noise* 20mhz bandwidth 50 75 mvp-p switching frequency full load, nominal input 100 khz *test ripple and noise by "p arallel cable " method. see detailed operation instructions at testing . note: 1. all specifications measured at t a =25 , humidity<75%, nominal input voltage and rated output load unless otherwise specified. 2. see below recommended circuits for more details. 3. dual output models unbalanced load: 5%. typical typical characteristics characteristics outline outline dimensions dimensions & & pin pin connections connections
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