SHV Series

■

Recommended pattern

■

Lowering the output noise even farther

1) The MHV series uses a metallic case. When mounting

The MHV series does need any external parts, however

to a double-sided PCB, the wiring for the converter should

to lower the output noise even farther, connect a

be on the soldering side.

capacitor C2 like the figure below.

Also, this converter will generate high voltages so the

creepage distance should also be taken in when designing.

2) When mounting to a double-sided PCB, the land of

the parts side of the high voltage output pin should

be as small as possible.

3) The metallic case does not need to be connect to ground.

However, when using and gound with the metallic case,

make the impedance lower as possible between the ground.

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Vref pin (Standard voltage output)

When adjusting the output voltage with an adjustable

resistor, this pin is used. Vref has a standard output

When lowering the output noise even more, keep in mind the

voltage of 4V. In this case, use an external resistor with

input/output wiring, creepage and area distance, while

a resistance of 5KΩ.

keeping the wiring as thin as possible and layout the C2

The resistance(the margin of error) of external adjustable resistor

near to the Load.

will affect the setting value of Vref pin voltage, so use a resistor

with high accuracy of 5KΩ±5%. The type of adjustable resistor

(5KΩ) will not matter, however one with a well temperature

coefficient is recommended.

Point!

1) When choosing a capacitor that connect to the input,

choose one which is a high frequency characteristic capacitor.

2) Common pattern should be designed thick and short to

make same impedance small.

3) The capacitor which is connected to the output side should

be able to withstand the pressure, and connect to the load

side. At this time, the capacitor lead should be shortened.

Also,when the load response time is a problem, please be

■

Prevention of inverse input connection

aware of the time constant.

The converter may break if the polarities are reversed.

If there is a possibility in which the connections maybe

reversed, connect a diode and fuse to the input pin like

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Guarantee

below.

This product shall be guaranteed for year. During this period,

if there should be any failure definitely due to our designing

or manufacturing, we will repair or replace it with a new one

at our expense. However, in any case that the product is

modified and/or has made any interal remodlling by the buyer,

the product can no longer be guaranteed. This guarantee shall

cover only the SHV series.

■

Recommended soldering conditions

Soldering conditions for each part is as follows:

please contact to us.

1) Using a soldering iron

340 to 360℃

5 sec.

2) Using a soldering tub

230 to 260℃

10 sec.

E-mail: info@bellnix.com

http://www.bellnix.com

4

Bellnix High Voltage DC-DC Converters

BHV20080822

12V

SW1

Load

1

2

4

6

3

SW1

Open=ON

Short=OFF

+

C1

C2

5

7

+

Output voltage control

(Impress 0V to 4V)

C1=22 to 47μF

C2=0.047 to 0.1μF

(OPEN)

+Vin

Vref

Vcont

ON/OFF

SHV

-Vin

Vout (+ or -）

Vout (Com)

Vout　Com

Vcont

Vref

3

4

Standard

voltage origin

circuit

6

+

SHV

+Vin

Fuse

12V

-Vin