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参数资料
| 型号： | PT6404B |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 5 A SWITCHING REGULATOR, 800 kHz SWITCHING FREQ-MAX, PDFM12 |
| 封装： | PLASTIC, SIP-12 |
| 文件页数： | 8/14页 |
| 文件大小： | 302K |
| 代理商： | PT6404B |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT6400 Series
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:
(See note 1) 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).
Adjust Down:
(See note 1) Add a resistor (R2), between
pin 12 (V
o adjust) and pins 5-8 (GND).
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 products. 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)
location. 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 minimum 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 Vo
R1
=
(Va – Vo)
– 49.9
k
12.45 (2Va – Vo) – 49.9 k
(R2)
=
Vo – Va
Where:
V
o
= Original output voltage
V
a
= Adjusted output voltage
Table 1
PT6400 ADJUSTMENT RANGE
Series Pt #
PT6408
PT6404
PT6406
PT6407
PT6409
PT6405
Vo (nom)
1.2
1.5
1.8
2.1
2.5
3.3
Va (min)
1.1
1.3
1.5
1.8
2.1
2.8
Va (max)
1.4
1.8
2.2
2.6
3.1
3.8
R1
Adjust
Up
C1
100
F
C2
100
F
Vo
COM
Vin
++
(R2)
Adj Down
PT6400
9,10,11
12
5,6,7,8
2,3,4
Vin
Vo
G N D
Vo(adj)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PT6404D | 功能描述:DC/DC转换器 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: |
| PT6404E | 功能描述:DC/DC转换器 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: |
| PT6404P | 功能描述:开关变换器、稳压器与控制器 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 |
| PT6405 | 制造商:TI 制造商全称:Texas Instruments 功能描述:3 AMP ADJUSTABLE INTEGRATED SWITCHING REGULATOR |
| PT6405B | 功能描述:DC/DC转换器 3.3Vout 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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