Wide input / output, Buck-boost, ±Output DC/DC Converter
1 Watt BUD Series
10
Bellnix
DC-DC Converter
BDD20200930_Z02(BDD20190924_Z02)
(1)
7-2. Output voltage adjustment method
The output voltage can be adjusted by connecting a resistor between the ADJ pin and the -VOUT pin.
Connect a resistor Radj of the value according to the following equation.
Radj =
1.039 - 1.217 × |Vout
p,n
|
2.589 × |Vout
p,n
| - 60.17
× 10
6
- 33000 [Ω]
However,
3V ≤ |Vout
p,n
| ≤ 18V and Vin + |Vout
p,n
| ≤ 30V
.
Refer to the table below for main setting
examples.
Note 1: Be sure not to leave Radj OPEN. Overvoltage (±23.3V typ. at OPEN) may be output, which
may lead to damage the converter.
Typical example
|Vout
p,n
| Settings
[V]
Radj
[kΩ]
3.3
24.7(
≈
22 + 2.7)
5
73.8(
≈
27 + 47)
12
433(
≈
330 + 47 + 56)
15
774(
≈
680 + 47 + 47)
7-3. ON/ OFF control
By setting the voltage between the ON/OFF pins Von/off to High or Low, the output settings can be
controlled without switching the input on or off physically. For ON/OFF pin threshold voltage VH, VL and
input resistor, refer to section 4-2.
ON/OFF control can be performed with the circuit shown below.
Note 1 Be careful not to cause chattering between the ON/OFF and GND pins, and make sure that there
is an interval of Toff (section 4-2) or more from OFF to ON.
ON/OFF control
ON/OFF pin voltage
Von/off [V]
Output
setting
High (Von/off > VH)
ON
Low (Von/off < VL)
OFF
ON/OFF control circuit example
(pull-down configuration)
ON/OFF control circuit example
(push-pull configuration)
