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

1.5Watt BTA Series

11

DC-DC Converter

BDD20081

203

7-2-2 To raise the output voltage

Output voltage can be raised by connecting resistor Ra between Adjustable Output Pin (Vadj) and Minus Output

Pin (−Vout). (Unit for Ra is[kΩ])

BTA-S Series

BTA-W Seires

7

+Vout

6

Vadj

5

-

Vout

Ra

Load

7

+Vout

6

Vadj

4

-

Vout

Ra

Load

Common

5

Load

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

BTAXX-03SXXX

Vo = 1.26 × (91.5 + 2.62 Ra) / (32 + Ra)

Ra = (115.3 − 32 Vo) / (Vo − 3.30)

BTAXX-05SXXX

Vo = 1.26 × (84.8 + 3.98 Ra) / (17.8 + Ra)

Ra = (106.85 − 17.8 Vo) / (Vo − 5.01)

BTAXX-12SXXX

Vo = 1.26 × (201 + 9.53 Ra) / (16.9 + Ra)

Ra = (253.26 − 16.9 Vo) / (Vo − 12.01)

BTAXX-12WXXX

Vo = {1.26 × (429 + 19.1 Ra) / (18 + Ra)} / 2

Ra = (540.54 − 36 Vo) / (2 Vo − 24.07)

7-3 Output Over Current Protection Function

Output voltage will be lowered when output current is in state of over current and start operating over current

protection circuit. (Over current protection set point : 105 to 250% of rating current value)

It will automatically recover when over current state is released. In order to avoid from damage, please do not hold

the over current state for more than 30sec.

If by any reason does not auto recover after releasing, please off the output at ON/OFF control or switch off to

reactivate.

7-4 Low Input Voltage Protection Function

This product builds in low input voltage protection function to avoid malfunction at low input voltage. Commencing

operation and termination voltage range is within the below table.

Model

Commencing operation

Termination Voltage

BTA05

3.0 to 4.5V

BTA12

6.0 to 9.0V

BTA24

13 to 18V

BTA48

27 to 36V