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参数资料
| 型号： | PT6408 |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | 1.2Vout 3A 5V-Input Adjustable Step-Down ISR |
| 中文描述： | 1.2V 3A 输出 5V 输入的可调节步降 ISR |
| 文件页数： | 3/5页 |
| 文件大小： | 227K |
| 代理商： | PT6408 |
For assistance or to order, call
(800) 531-5782
3
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902
http://www.powertrends.com
A p p l i c a t i o n
N o t e s
PT6400 Series
More Applcation Notes
Adjusting the Output Voltage of the PT6400 Series
3AMP 5V Bus Converters
The output voltage of the Power Trends PT6400 Series ISRs
may be adjusted higher or lower than the factory trimmed pre-
set voltage with the addition of a single external resistor. Table 1
accordingly gives the allowable adjustment range for each model
in the series as V
a
(min) and V
a
(max).
Adjust Up:
An increase in the output voltage is obtained by adding a resistor
R1, between pin 12 (V
o
adjust) and pins 9-11 (V
out
).
(See note 1)
Adjust Down:
Add a resistor
(R2)
, between pin 12 (V
o
adjust) and pins 5-8
(GND).
(See note 1)
Refer to Figure 1 and Table 2 for both the placement and value
of the required resistor; either R1 or
(R2)
as appropriate.
Notes:
1. The direction in which each resistor adjusts the output of the
PT6400 series differs from many other Power Trends prod-
ucts. These output voltage adjustment notes are therefore
specific only to the PT6400 models.
2. Use only a single 1% resistor in either the R1 or
(R2)
loca-
tion. Place the resistor as close to the ISR as possible.
3. Never connect capacitors from V
o
adjust to either GND or
V
out
. Any capacitance added to the V
o
adjust pin will affect
the stability of the ISR.
4. An increase in the output voltage may place additional limits
on the input voltage range of the part. The revised mini-
mum input voltage will be (V
out
+ 1.2) or 4.5V, whichever is
higher. Do not exceed 5.5Vdc.
Figure 1
The values of R1 [adjust up], and
(R2)
[adjust down], can
also be calculated using the following formulae.
12.45 V
o
(V
a
– V
o
)
R1
=
– 49.9
k
12.45 (2V
a
– V
o
)
V
o
– V
a
– 49.9 k
(R2)
=
Where:
V
o
V
a
= Original output voltage
= Adjusted output voltage
Table 1
PT6400 ADJUSTMENT RANGE
Series Pt #
PT6408
PT6404
PT6406
PT6407
PT6409
PT6405
Vo (nom)
Va (min)
Va (max)
1.2
1.1
1.4
1.5
1.3
1.8
1.8
1.5
2.2
2.1
1.8
2.6
2.5
2.1
3.1
3.3
2.8
3.8
R1
Adjust Up
C1
100
μ
F
C2
100
μ
F
Vo
COM
COM
Vin
+
+
(R2)
Adj Down
PT6400
9,10,11
12
5,6,7,8
2,3,4
Vin
Vo
GND
Vo(adj)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PT6408E | 功能描述:开关变换器、稳压器与控制器 ADJ STEP-DOWN ISR RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| PT6408P | 功能描述:REGULTR 5V/1.2V 3A SYNC 12XL VER RoHS:否 类别:电源 - 板载 >> DC DC Converters 系列:PT6400 标准包装:10 系列:PT4570 类型:隔离 输出数:1 电压 - 输入（最小）:36V 电压 - 输入（最大）:75V Voltage - Output 1:9V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:3.3A 电源（瓦） - 制造商系列:30W 电压 - 隔离:1.5kV（1500V） 特点:- 安装类型:表面贴装 封装/外壳:19-SIP SMD 模块 尺寸/尺寸:3.00" L x 1.19" W x 0.50" H（76.2mm x 30.2mm x 12.7mm） 包装:托盘 工作温度:-40°C ~ 85°C 效率:84% 电源（瓦特）- 最大:30W |
| PT6409 | 制造商:TI 制造商全称:Texas Instruments 功能描述:3 AMP ADJUSTABLE INTEGRATED SWITCHING REGULATOR |
| PT6409B | 功能描述:REGULTR 2.5V 3A SYNC 12XL SMD RoHS:否 类别:电源 - 板载 >> DC DC Converters 系列:PT6400 标准包装:10 系列:PT4570 类型:隔离 输出数:1 电压 - 输入（最小）:36V 电压 - 输入（最大）:75V Voltage - Output 1:9V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:3.3A 电源（瓦） - 制造商系列:30W 电压 - 隔离:1.5kV（1500V） 特点:- 安装类型:表面贴装 封装/外壳:19-SIP SMD 模块 尺寸/尺寸:3.00" L x 1.19" W x 0.50" H（76.2mm x 30.2mm x 12.7mm） 包装:托盘 工作温度:-40°C ~ 85°C 效率:84% 电源（瓦特）- 最大:30W |
| PT6409D | 功能描述:DC/DC转换器 2.5Vout 3A 5V-Inp Adj Step-Down ISR RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
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