The Fifth Generation, Ultra Small Size, Isolated DC-DC Converter

1.5Watt BTA Series

10

DC-DC Converter

BDD2008

1203

7-2 Adjustable Output Voltage

Output voltage can be set as follow when Vadj pin and −Vout pin is short.

Please open this pin when not adjusting the output voltage.

Output voltage to connection of Vadj pin

Model

Open

−Vout and

Short

BTAXX-03SXXX

3.3V

3.6V

BTAXX-05SXXX

5.0V

6.0V

BTAXX-12SXXX

12V

15V

BTAXX-12WXXX

±12V

±15V

Output voltage is adjustable by connecting resistor between Vadj pin and +Vout pin. (Or between Vadj pin and

−Vout pin)

Note : When adjusting the output voltage, please operate below max. power

7-2-1 To lower the output voltage

Output voltage can be lowered by connecting resistor Rb between Adjustable Output Pin (Vadj) and Plus Output

Pin (+Vout). Calculation is as below. (Unit of Rb is [kΩ]).

BTA-S Series

BTA-W Series

7

+Vout

6

Vadj

5

-

Vout

Rb

Load

7

+Vout

6

Vadj

4

-

Vout

Rb

Load

Common

5

Load

Output Voltage : Vo[V]，Connecting resistor : Rb[kΩ]

BTAXX-03SXXX

Vo = 1.26 × (91.5 + 2.62 Rb) / (39.6 + Rb)

Rb = (39.6 Vo − 115.3) / (3.30 − Vo)

Adjustable range is up to 3.15V.（Rb≧62）

BTAXX-05SXXX

Vo = 1.26 × (84.8 + 3.98 Rb) / (31.8 + Rb)

Rb = (31.8 Vo − 106.85) / (5.01 − Vo)

Adjustable range is up to 4.75V.（Rb≧160）

BTAXX-12SXXX

Vo = 1.26 × (201 + 9.53 Rb) / (57 + Rb)

Rb = (57 Vo − 253.26) / (12.01 − Vo)

Adjustable range is up to 11.4V.（Rb≧620）

BTAXX-12WXXX

Vo = {1.26 × (429 + 19.1 Rb) / (103 + Rb)} / 2

Rb = (206 Vo − 540.54) / (24.07 − 2 Vo)

Adjustable range is up to ±11.4V. (Rb≧1500)