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參數(shù)資料
| 型號(hào)： | PT6446A |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 6 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA12 |
| 封裝： | SIP-12 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 204K |
| 代理商： | PT6446A |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT6440 Series
Adjusting the Output Voltage of the PT6440
Excalibur
5V/3.3V Bus Step-Down ISRs
The output voltage of the PT6440 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 gives the allowable adjustment range for each
model for either series as Va (min) and Va (max).
Adjust Up:
An increase in the output voltage is obtained by
adding a resistor R2, between Vo Adj (pin 12) and GND
(pins 5–8).
Adjust Down:
Add a resistor (R1), between Vo Adj (pin 12)
and Vout (pins 9–11).
Figure 1
The values of (R1) [adjust down], and R2 [adjust up], can
also be calculated using the following formulas. Refer to
Figure 1 and Table 2 for both the placement and value of the
required resistor; either (R1) or R2 as appropriate.
(R1)
=
Ro (Va – 0.9)
– Rs
k
Vo – Va
R2
=
0.9 Ro
– Rs
k
Va – Vo
Where:
Vo = Original output voltage
Va = Adjusted output voltage
Ro = The resistance value from Table 1
Rs = The series resistance from Table 1
Table 1
ISR ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt. #
PT6441
PT6442
PT6443
PT6444
PT6445
PT6446
PT6447
Vo (nom)
3.3
2.5
2.0
1.8
1.5
1.2
1.0
Va (min)
2.88
1.97
1.64
1.5
1.3
1.08
0.97
Va (max)
3.5
2.95
2.45
2.25
1.95
1.65
1.45
Ro (k
)
10.0
10.2
Rs (k
)
49.9
20.0
R
2
Adjust Up
C
2
+V
O
COM
+V
IN
+
(R
1)
Adj Down
PT6440
2,3,4
5–8
12
9,10,11
Vin
Vo
Vo(adj)
GND
C
1
+
Notes:
1. Use only a single 1% resistor in either the (R1) or R2
location. Place the resistor as close to the ISR as possible.
2. Never connect capacitors from Vo adj to either GND or
Vout. Any capacitance added to the Vo adjust pin will affect
the stability of the ISR.
3. For each model, adjustments to the output voltage may
place additional limits on the minimum input voltage.
The revised minimum input voltage must comply with the
following requirement.
Vin(min) = (Va + 0.5)V or as specified in the data sheet,
whichever is greater.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT6446C | 功能描述:DC/DC轉(zhuǎn)換器 ADJ STEP-DOWN ISR RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
| PT6446N | 功能描述:REG ISR 6A 3.3/5VIN ADJ VRT12SIP RoHS:否 類別:電源 - 板載 >> DC DC Converters 系列:PT6440 設(shè)計(jì)資源:Maxi/Mini/Micro Design Guide, Appl Manual 標(biāo)準(zhǔn)包裝:1 系列:Maxi 類型:隔離 輸出數(shù):1 電壓 - 輸入（最?。?43V 電壓 - 輸入（最大）:110V Voltage - Output 1:15V Voltage - Output 2:- Voltage - Output 3:- 電流 - 輸出（最大）:* 電源（瓦） - 制造商系列:400W 電壓 - 隔離:* 特點(diǎn):* 安裝類型:通孔 封裝/外殼:模塊 尺寸/尺寸:4.60" L x 2.20" W x 0.54" H（116.8mm x 55.9mm x 13.7mm） 包裝:散裝 工作溫度:-55°C ~ 100°C 效率:* 電源（瓦特）- 最大:* |
| PT6447 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:6-A 5-V/3.3-V Input Adjustable Integrated Switching Regulator |
| PT6447A | 功能描述:REG ISR 6A 3.3/5VIN ADJ HRZ12SIP RoHS:否 類別:電源 - 板載 >> DC DC Converters 系列:PT6440 設(shè)計(jì)資源:Maxi/Mini/Micro Design Guide, Appl Manual 標(biāo)準(zhǔn)包裝:1 系列:Maxi 類型:隔離 輸出數(shù):1 電壓 - 輸入（最小）:43V 電壓 - 輸入（最大）:110V Voltage - Output 1:15V Voltage - Output 2:- Voltage - Output 3:- 電流 - 輸出（最大）:* 電源（瓦） - 制造商系列:400W 電壓 - 隔離:* 特點(diǎn):* 安裝類型:通孔 封裝/外殼:模塊 尺寸/尺寸:4.60" L x 2.20" W x 0.54" H（116.8mm x 55.9mm x 13.7mm） 包裝:散裝 工作溫度:-55°C ~ 100°C 效率:* 電源（瓦特）- 最大:* |
| PT6447C | 功能描述:REG ISR 6A 3.3/5VIN ADJ SMD12SIP RoHS:否 類別:電源 - 板載 >> DC DC Converters 系列:PT6440 設(shè)計(jì)資源:Maxi/Mini/Micro Design Guide, Appl Manual 標(biāo)準(zhǔn)包裝:1 系列:Maxi 類型:隔離 輸出數(shù):1 電壓 - 輸入（最?。?43V 電壓 - 輸入（最大）:110V Voltage - Output 1:15V Voltage - Output 2:- Voltage - Output 3:- 電流 - 輸出（最大）:* 電源（瓦） - 制造商系列:400W 電壓 - 隔離:* 特點(diǎn):* 安裝類型:通孔 封裝/外殼:模塊 尺寸/尺寸:4.60" L x 2.20" W x 0.54" H（116.8mm x 55.9mm x 13.7mm） 包裝:散裝 工作溫度:-55°C ~ 100°C 效率:* 電源（瓦特）- 最大:* |
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