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a pp li ca ti on n o t es output voltage 1.8v-3.3v ultra high efficiency 92% to-3pl size, step-down non-isolated type dc-dc converter 10 watt vsi-mini a series ( a ) s tandard c onnection c hoice o f external capacitors c 1=100f20wv c 2=2.2f~4.7f c 2: no need to add the output capacitor, because it is built in. in case that the wiring is long to the load, output noise may be f urther reduced with the c 2 added. rating o utput voltage : 3.3v 5 % figure5 ( b ) o n /o ff c ontrol connection o n /o ff can be controlled by opening or shortening 1pin and 3pin. transistor ( open collector ) is recommended f or the open and short control parts. o utput o n mode between 1pin and 3 pin : o pen o utput o ff mode between 1pin and 3 pin : s h o rt off state voltage 0~0.5vdc ( 100a max. ) figure6 (c) o utput voltage adjustment c onnection it is possible to adjust output voltage by connecting a resistor between 5pin ( v.adj ) and 4pin ( +vout ) . the output voltage trim range is as in 3.0~5.0v. the output voltage adjustable resistor can be calculated by the following equation. output voltage adjustable equation r x r y (v o- v s ) r x v s - r y (v o- v s ) figure7 to adjust output voltage : c 3=100f~220f table 3 vsi-3.3v type calculated valu e vo: desired o utput voltage ( vout trim range: 1.8v-3.3v ) vr1: vout variable resistor(down) vs=0.8v ry=20k ohm rx=62.51k ohm note1: when 5pin v.adj is open, the output will be the rating value. note2: when using a trimmer potentiometer, be careful of the position of the figure8 adjustable lug. we recommend you to confirm the resistor value in advance, or to start the initial energizing after turning the lug in the direction of low voltage. and for mass production we recommend to use a fixed resistor. note3: we recommend checking the output voltage value, using converter after calculating the resistor value. note4: when changing output voltage, add c3=100f~220f. ka g a electronics/vol g en dc-dc converters www.vol g en.com rx vs ry rz v.adj -vout +vout vr1 4 5 3 load vr1=
output voltage 1.8v-3.3v ultra high efficiency 92% to-3pl size, step-down non-isolated type dc-dc converter 10 watt vsi-mini a series these test date do not represent all product. v si-3.3s2r0ma figure9 vsi-3.3s2r0ma figure10 ka g a electronics/vol g en dc-dc converters www.vol g en.com test condition : rating input/rating load/ room temperature test condition : rating input/rating load/ room temperature test circuit is indicated in figure 13. test condition vin=7.5v vout=3.3v io=2a ta=25c osc=20mhz vout 1v/div vin 5v/div vout=0v vin=0v vin=on time:1ms/div time:2s/div output ripple-noise : 20mv/div test condition vin=7.5v vout=3.3v io=2a ta=25c
output voltage 1.8v-3.3v ultra high efficiency 92% to-3pl size, step-down non-isolated type dc-dc converter 10 watt vsi-mini a series note: these test date do not represent all product. model: v s i-5.0 s 2r0m a temp. : 25c input output voltage current powe r voltage current ripple/noise powe r ( v )( a )( w )( v )( a )( mvp-p )( w )( % ) 4.750 0.0005 0.002 3.316 0 24/24 0 - 4.751 0.366 1.739 3.304 0.501 12/20 1.655 95.17 4.743 0.733 3.477 3.302 1.005 12/20 3.319 95.46 4.753 1.105 5.252 3.300 1.505 16/20 4.967 94.57 4.754 1.486 7.064 3.298 2.006 16/24 6.616 93.66 7.499 0.0005 0.004 3.315 0 24/24 0 - 7.501 0.239 1.793 3.304 0.501 60/60 1.655 92.3 7.502 0.472 3.541 3.302 1.004 20/28 3.315 93.62 7.501 0.710 5.326 3.299 1.504 24/28 4.962 93.17 7.500 0.953 7.148 3.298 2.004 24/32 6.609 92.46 13.600 0.0004 0.005 3.315 0 20/20 0 - 13.595 0.141 1.917 3.303 0.501 48/48 1.655 86.33 13.594 0.270 3.67 3.301 1.004 32/36 3.314 90.3 13.593 0.401 5.451 3.298 1.503 32/40 4.957 90.94 13.606 0.534 7.266 3.295 2.000 32/40 6.590 90.7 ka g a electronics/vol g en dc-dc converters www.vol g en.com efficiency figure 13 figure 11 figure 12 efficiency vs. output current for input voltage 0 75 80 85 90 95 100 012 output current (a) efficiency (%) vin=4.75v vin=7.5v vin=13.6v 100 40 50 60 70 80 90 0 10 20 30 load rate (%) 20 10 0 -10 70 60 50 40 30 ambient temperature ()
output voltage 1.8v-3.3v ultra high efficiency 92% to-3pl size, step-down non-isolated type dc-dc converter 10 watt vsi-mini a series < s oldering c onditions> solder to be executed under the following conditions. the input/ output of vsi-mini a series is a non-isolated type and a 1. soldering iron 340c - 360c within 5sec. step-down dc-dc converter from (+) polarity to (+) polarity. 2. soldering dip 230c - 260c within 10sec. if you connect the input polarity reversed of this product by mistake 3. reflow method (only for smd type) it will be eventually damaged. if there is a possibility of reverse connection, please add a protection circuit as indicated in figure14. the figure below is an example using fuse and diode. fuse is not built-in, so connecting fuse into input line is recommended to protect from abnormal condition. please storage this unit in the ambient temperature under 30c < m e th o d t o d ecrease th e no i se l eve l ( ex. ) > and humidity condition under 60%rh. and please obey the following usually vsi-mini a series is used by adding input/output capacitor, -keep it in a place where the unit will not be influenced by poisonous gas. please make sure to design the print board with special attention to the - please avoide the dust. following items in order to obtain lower noise level by taking advantage -keep it in a place where direct sunlight will not effect it. of the performance of a converter. *1,2 apply to sip and dip, 3 applies to smd. 1. use low impedance capacitor with good high frequency characteristic. < cl ean i ng c on diti on> 2. shorten the lead of each capacitor as much as possible, and this product can not be cleaned bodily. non-cleaned flax is make it low lead inductance. recommended. when and if cleaning only for sip and dip type should be 3. make the wiring loop space between (+) and (-) of both input and necessary, use ipa and hand-wash the soldered surface by brush cleaning. output pin side small as much as possible. after cleaning, please dry enough to use it. you can decrease the influence of leakage inductance. 4. design the print pattern of the main circuit thick and short as < o ver v o lt age pro t ec ti on> much as possible. vsi-mini a series does not have a built-in over voltage protection. when the switching element of this converter gets damaged by short mode, input voltage (+vin) will go out as output. for emergency if it gets damages at over-voltage mode, please add a circuit as below to intercept the supplying power circuit. < p recau ti ons> 1. for this product parallel/series operation is not possible. 2. for mounting this product, please do not use connector or socket. the performance may not be fulfilled by the effect of contacting resistor. mount to print board by soldering. notes: 3. this product has a built-in over current and short protection 1 when it is damaged at over-voltage mode, on/off control does not operate. circuit, but long time short circuit will cause failure, 2 when there is a on/off function on the supplying power side, it can be so please avoid that. used, too. for further inquiries, please contact us. 4. this product can not not be used in case that it would effect lives 3 when there is a dc power supply on the supplying power side, or properties directly by the failure of this product. please confirm please make sure to have the capacity the fuse can be cut. us before adopting it. 5. product can not be used under vibration, shock or tmp.conditions that are out of the specification. contact us, if any question. 6. there is possibility of damage from static. when the worker has electrified static, electrical discharge by grounding should be done and the working on the table may be recommended. 7. no test certificate is attached to this product. ka g a electronics/vol g en dc-dc converters www.vol g en.com make the loop space small make the leed short make the loop space small make the leed short +vout ground +vin on/ off +vout adj 10 w load bellnix 1 figure 14 figure 15 figure 16 150c 120-180 sec. 220c time temperature reflow temperature profile 180c preliminary heating 60s max. 250cmax. 1cycle peak temperature

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