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参数资料
| 型号： | PTK25-D48-T515 |
| 元件分类： | 电源模块 |
| 英文描述： | 3-OUTPUT 25 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | PACKAGE-6 |
| 文件页数： | 4/4页 |
| 文件大小： | 656K |
| 代理商： | PTK25-D48-T515 |
rev.
page
date
DESCRIPTION: dc-dc converter
4 of 4
06/2009
20050
SW 112th Ave. Tualatin, Oregon 97062
phone
phone 503.612.2300 fax
fax 503.612.2382
PART NUMBER: PTK25
APPLICATION NOTES
1. OUTPUT TRIMMING
The output voltages are preset to nominal values as indicated by the models table at the factory. If desired, the output voltage may
optionally be trimmed to a different value (+/- 10%) with external resistors and/or potentiometer as shown below.
To trim the output voltage with fixed resistors, the output voltage can be calculated as follows.
Trim-Up
Trim-Down
FIGURE 2: TRIM-UP VOLTAGE SETUP
FIGURE 3: TRIM-DOWN VOLTAGE SETUP
The value of Rtrim-up is defined as:
The value of Rtrim-down is defined as:
Where: Rtrim-up is the external resistor in KΩ. Vo is the
Where: Rtrim-down is the external resistor in KΩ. Vo is the
desired output voltage. R1 and R2 and Vr are internal to
the unit and are defined in Table 1. For example to trim up
the unit and are defined in Table 1. For example to trim down
the PTK25-D5-D12 up by 5% to 25.2 V, Rtrim-up is calculated
the PTK25-D5-D12 down by 5% to 22.8 V, Rtrim-down is calculated
as follows:
R load
10KW
Trimpot
+Vin
-Vin
-Vo
Trim
+Vo
FIGURE 1. TRIMMING WITH
EXTERNAL POTENTIOMETER
2.5
1.25
Vr (V)
2.43
2.4
2.43
0.68
R2 (K
Ω)
Model
PTK25-DXX-D15
PTK25-DXX-D12
PTK25-DXX-D5
PTK25-DXX-S15
PTK25-DXX-S12
PTK25-DXX-S5
PTK25-DXX-S3.3
26.7
21
7.32
12.1
9.31
2.43
1.13
R1 (K
Ω)
Table 1
R load
R trim-up
+Vin
-Vin
+Vo
Trim
-Vo
R load
R trim-down
+Vin
-Vin
+Vo
Trim
-Vo
Vo = 25.2 / R1 = 21 KΩ / R2 = 2.43 KΩ / Vr = 2.5
=
Rtrim_up
47.94 KΩ
2.43 (25.2 - 2.5) - 2.5 21
2.5 21 2.43
Vo = 22.8 / R1 = 21 KΩ / R2 = 2.43 KΩ / Vr = 2.5
=
Rtrim_down
326.68 KΩ
2.5 - 2.1 (22.8 - 2.5) 2.43
(22.8 - 2.5) 21 2.43
=
Rtrim_up
R2 (Vo - Vr) - Vr R1
Vr R1 R2
=
Rtrim_down
Vr R1 - (Vo - Vr) R2
(Vo - Vr) R1 R2
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