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APC12MK03-9MAJ Datasheet(PDF) 10 Page - Astec America, Inc

Part # APC12MK03-9MAJ
Description  Non-Isolated DC/DC Power Module Tiny SMT Footprint - 1.8V-12V Input, 0.9V to 3.6V Output
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Manufacturer  ASTEC [Astec America, Inc]
Direct Link  http://www.astecinc.com/
Logo ASTEC - Astec America, Inc

APC12MK03-9MAJ Datasheet(HTML) 10 Page - Astec America, Inc

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Technical Reference Notes
APC12 Centauri II
MODEL: APC12 SERIES
SHEET 10 OF 23
JANUARY 6, 2002 REVISION A (PRELIMINARY)
Trim Function (continued)
To adjust Vo to a higher value, please refer to
Figure 4. The required resistor value (Rt) can be
determined through Equation (1) where Vo is the
voltage on P2 before the adjustment and Vot is the
voltage of P2 after Rt is connected.
1
R
Vo
Vot
Vref
Rt
=
Equation (1)
Please refer to related constants given in TABLE 1 to calculate the Equation.
TABLE 1. CONSTANTS
Version
0.9V
1.2V
1.5V
1.8V
2.5V
3.3V
R1
APC08/12x03
R2
97.6k
8.45k
4.32k
2.94k
1.69k
1.13k
3.09k
APC08/12x08
R2
210k
17.4k
9.09k
6.04k
3.48k
2.32k
6.49k
Vref
0.87V
Be aware that the maximum Vo allowed is 3.6V. Please refer to Centauri datasheet.
Example:
Module version: APC08J03-9 (1.8 to 6.0Vin, 0.9Vo).
Requiring to adjust output voltage from Vo = 0.9V to Vot = 1.8V. Vref = 0.87V and R1 = 3.09k
Ω (from TABLE 1).
Based on Equation (1), Rt can be determined as 3.0k
Ω.
To adjust Vo to a lower value, Rt should be connected between P4 and P2. Equation (2) provides the calculation for Rt.
2
)
(
)
)(
(
R
V
V
V
V
V
V
V
Rt
ot
o
ref
ref
ot
ref
o
=
Equation (2)
Be aware that the minimum Vo is 0.9V.
Example
Module version: APC08F03-9 (4.0 to 6.Vin, 3.3Vo).
Requiring to adjust the output voltage from Vo = 3.3V to Vot = 3.3 (1-0.02) = 3.234V.
Vo = 3.3V, Vot = 3.234V, Vref = 0.87V, R2 = 1.13k
Ω (from TABLE 1).
Based on Equation (1), Rt can be determined as 111.9k
Ω.
Figure 4. Output Voltage Trim Setup.


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