AGQ150-48S05 DC-DC Converter
9/13
Trim Characteristics
Connecting an external resistor between Trim pin and Vo- pin will decrease the output voltage.
While connecting it between Trim and Vo+ will increase the output voltage. The following equations
determine the external resistance to obtain the trimmed output voltage.
510
Rtrim−down
=
−10.2(kΩ)
Δ
5.1×Vnom
×
(
100 + Δ
)
510
Rtrim−up
=
−
−10.2(kΩ)
1.225× Δ
Δ
△=(Vo-Vnom)×100/Vnom
V
nom : Nominal output voltage
For example, to get 5.5V output, the trimming resistor is
5.1× 5×
(
100 + (5.5 − 5) ×100 / 5
)
510
Rtrim−up
=
−
−10.2 =167.8(kΩ)
1.225× (5.5 − 5) ×100 / 5
(5.5 − 5) ×100 / 5
The output voltage can also be trimmed by potential applied at the Trim pin.
Vo = 2.041Vtrim + 2.5
Where Vtrim is the potential applied at the Trim pin, and Vo is the desired output voltage.
When trimming up, the output current should be decreased accordingly so as not to exceed the
maximum output power.
Vo+
S+
Vo+
S+
Load
Load
Rtrim_down
Trim
Trim
Rtrim_up
Cout
Cout
S-
S-
Vo-
Vo-
Figure 13 Trim up
Figure 14 Trim down
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