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參數(shù)資料
| 型號： | APC12Y08-9J |
| 英文描述： | CHOKE,AXIAL,CONFORMAL,22uH, 5% INDUCTIVE TOL,140 IDC, |
| 中文描述： | 非隔離DC / DC電源模塊微型貼片足跡- 1.8 - 12V輸入，0.9V至3.6V的輸出 |
| 文件頁數(shù)： | 10/23頁 |
| 文件大?。?/td> | 684K |
| 代理商： | APC12Y08-9J |
Technical Reference Notes
APC12 Centauri II
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.
Vref
Rt
Equation (1)
MODEL: APC12 SERIES
JANUARY 6, 2002 REVISION A (PRELIMINARY)
SHEET 10 OF 23
1
R
Vo
Vot
=
Please refer to related constants given in TABLE 1 to calculate the Equation.
TABLE 1. CONSTANTS
1.2V
1.5V
8.45k
4.32k
17.4k
9.09k
APC08/12x03
APC08/12x08
V
ref
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. V
ref
= 0.87V and R
1
= 3.09k
(from TABLE 1).
Based on Equation (1), Rt can be determined as 3.0k
.
To adjust Vo to a lower value
, Rt should be connected between P4 and P2. Equation (2) provides the calculation for Rt.
)
)(
(
R
V
V
V
ot
o
ref
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, V
ref
= 0.87V, R
2
= 1.13k
(from TABLE 1).
Based on Equation (1), Rt can be determined as 111.9k
.
Version
R2
R2
0.87V
0.9V
97.6k
210k
1.8V
2.94k
6.04k
2.5V
1.69k
3.48k
3.3V
1.13k
2.32k
R1
3.09k
6.49k
2
)
(
V
V
V
V
Rt
ref
ot
ref
o
=
Equation (2)
Figure 4. Output Voltage Trim Setup.
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