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參數(shù)資料
| 型號： | APC08Y08-W |
| 英文描述： | Non-Isolated DC/DC Power Module |
| 中文描述： | 非隔離DC / DC電源模塊 |
| 文件頁數(shù)： | 10/23頁 |
| 文件大?。?/td> | 2632K |
| 代理商： | APC08Y08-W |
Technical Reference Note (APC08)
MODEL: APC08 SERIES
OCTOBER 4, 2004 - REVISION 03
SHEET 10 OF 23
Method 1: External Trim Resistor
(continued)
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
= 0.875V, R
2
= 1.13k
(from TABLE 1).
Based on Equation (1), Rt can be determined as 111.9k
.
Trim Function
(continued)
Method 2: External DC Source
By connecting an external DC supply across P4 (Enable) and P3 (GND) through a limiting resistor Rt, (see Figure 5), output
voltage adjustment can also be achieved. Equation 3 provides the relationship between the External DC supply, Vt, and Vo
(where Vo is the desired output voltage).
Given:
Rt
= 10k
Vo Adjustment to Lower Voltages.
This method does not limit the recommended lower Vo adjustment to 2% as mentioned
on previous sections re: Vo adjustment through external trim resistor.
Example:
Module version: APC08G03-9 (3V to 6Vin, 2.5Vo).
Requiring to adjust the output voltage from Vo = 2.5V to 1.8V
Vo = 1.8V, V
r
= 0.87V, R
1
= 3.09k
, R
2
= 1.69k
(from Table 1). Based on Equation (3), Vt = 3.0V.
Example:
Module version: APC08G03-9 (3V to 6Vin, 2.5Vo).
Requiring to adjust the output voltage from Vo = 2.5V to 0.9V
Vo = 0.9V, V
r
= 0.87V, R
1
= 3.09k
, R
2
= 1.69k
(from Table 1). Based on Equation (3), Vt = 5.9V.
Vo
R
Rt
Vr
R
Rt
R
Rt
Vt
1
2
1
1
+
+
=
Equation (3)
Figure 5. External DC source for output trim adjust.
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