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
<Soldering Conditions>
<To prevent reverse input voltage protection (ex.)>
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
2. Soldering dip
3. Reflow method (only for SMD type)
Reflow temperature profile
340°C - 360°C within 5sec.
230°C - 260°C within 10sec.
step-down DC-DC converter from (+) polarity to (+) polarity.
If you connect the input polarity reversed of this product by mistake
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.
Peak Temperature
250°Cmax.
Fuse is not built-in, so connecting fuse into input line is recommended to
protect from abnormal condition.
220°C
60s max.
180°C
Preliminary Heating
120-180 sec.
150°C
1cycle
timeꢀ→
Figure 14
<Method to decrease the noise level (ex.)>
Usually VSI-mini A series is used by adding input/output capacitor,
please make sure to design the print board with special attention to the
following items in order to obtain lower noise level by taking advantage
of the performance of a converter.
1. Use low impedance capacitor with good high frequency
characteristic.
Please storage this unit in the ambient temperature under 30°C
and humidity condition under 60%RH. And please obey the following
-Keep it in a place where the unit will not be influenced by poisonous gas.
- Please avoide the dust.
-Keep it in a place where direct sunlight will not effect it.
*1,2 apply to SIP and DIP, 3 applies to SMD.
<Cleaning Condition>
2. Shorten the lead of each capacitor as much as possible, and
make it low lead inductance.
3. Make the wiring loop space between (+) and (-) of both input and
output pin side small as much as possible.
This product can not be cleaned bodily. Non-cleaned flax is
recommended. When and if cleaning only for SIP and DIP type should be
necessary, use IPA and hand-wash the soldered surface by brush cleaning.
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
<Over Voltage protection>
much as possible.
B ellnix
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.
Make the loop space small
Make the loop space small
1
For emergency if it gets damages at over-voltage mode, please add a
circuit as below to intercept the supplying power circuit.
+Vout
+Vin
10 W
Load
Ground
Make the leed short
Make the leed short
ON/OFF
+Vout ADJ
Figure 16
<Precautions>
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.
3. This product has a built-in over current and short protection
circuit, but long time short circuit will cause failure,
so please avoid that.
4. This product can not not be used in case that it would effect lives
or properties directly by the failure of this product. Please confirm
us before adopting it.
Figure 15
Notes:
1 When it is damaged at over-voltage mode, On/Off control does not operate.
2 When there is a On/Off function on the supplying power side, it can be
used, too. For further inquiries, please contact us.
3 When there is a DC Power Supply on the supplying power side,
please make sure to have the capacity the fuse can be cut.
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.
Kaga Electronics/Volgen DC-DC CONVERTERS
www.volgen.com
VOLGEN [ VOLGEN KAGA ELECTRONICS INC. ]
