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參數(shù)資料
| 型號： | PT6942N |
| 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, SMA27 |
| 封裝： | ROHS COMPLIANT, SIP-27 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 210K |
| 代理商： | PT6942N |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
Adjusting the Output Voltages of the
PT6940 Dual-Output ISRs
Each output voltage from the PT6940 series of integrated
switching regulators (ISRs) can be independently adjusted
higher or lower than the factory trimmed pre-set voltage.
The voltages, Vo1 and Vo2 may each be adjusted either up
or down using a single external resistor 1. Table 1 gives the
adjustment range for both Vo1 and Vo2 for each model in
the series as Va(min) and Va(max). Note that Vo2 must
always be lower than Vo1 2.
Vo1 Adjust Up: To increase the output, add a resistor R2
between pin 2 (Vo1 Adjust) and pins 7-12 (GND) 3.
Vo1 Adjust Down: Add a resistor (R1), between pin 2
(Vo1 Adjust) and pin 3 (Vo1 Sense).
Vo2 Adjust Up:
Add a resistor R4 between pin 27
(Vo2 Adjust) and pins 17–22 (GND).
Vo2 Adjust Down: Add a resistor (R3) between pin 27
(Vo2 Adjust) and pin 26 (Vo2 Sense).
Refer to Figure 1 and Table 2 for both the placement and value of
the required resistor.
The adjust up and adjust down resistor values can also be
calculated using the following formulas. Be sure to select
the correct formula parameter from Table 1 for the output
and model being adjusted.
(R1) or (R3)
=
10 (Va – 0.9 )
– Rs
k
Vo – Va
R2 or R4
=
9
– Rs
k
Va – Vo
Figure 1
Where: Vo = Original output voltage, (Vo1 or Vo2)
Va = Adjusted output voltage
Rs = The series resistance from Table 1
Notes:
1.Use only a single 1% resistor in either the (R1) or R2
location to adjust Vo1, and in the (R3) or R4 location to
adjust Vo2. Place the resistor as close to the module as
possible.
2.Vo2 must always be at least 0.3V lower than Vo1.
3.When adjusting Vo1 higher than the factory pre-set
output voltage the minimum input voltage must be
revised as follows.
Vo1 =3.3V:
Vin(min) = (Vo1 + 1)V or 4.5V, whichever is greater.
Vo1 =2.5V:
Vo1 =2.5V is the maximum output voltage allowed for
operation off a 3.3V input bus. If Vo1 is adjusted above
2.5V, the input voltage must be a minimum of 4.5V.
4.Vo1 and Vo2 may be adjusted down to an alternative bus
voltage by making, (R1) or (R3) respectively, a zero ohm
link. Refer to the Table 1 footnotes for guidance.
5.Never connect capacitors to either the Vo1 Adjust or
Vo2 Adjust pins. Any capacitance added to these control
pins will affect the stability of the respective regulated
output.
PT6940 Series
PT6940
Co
1
+
13–16
4–6
23–25
C
IN
26
Co
2
+
3
Vo
1
Vo
2
L
O
A
D
L
O
A
D
Vo
2 Sense
Vo
1 Sense
V
IN
GND
+
7–12
17–22
R2
(R1)
(R3)
R4
Vin
V
1 Adj
V
2 Adj
Vo
1
Vo
2
V
1 Sns
V
2 Sns
27
2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT6943 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:6-A Dual Output 5-V/3.3-V Input Integrated Switching Regulator |
| PT6943A | 功能描述:DC/DC轉(zhuǎn)換器 3.3V/1.5V 6A+6A 5V-In Dual Otpt 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: |
| PT6943C | 功能描述:DC/DC轉(zhuǎn)換器 3.3V/1.5V 6A+6A 5V-In Dual Otpt 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: |
| PT6943N | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3.3V/1.5V 6A+6A 5V-In Dual Otpt ISR RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| PT6944 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:6-A Dual Output 5-V/3.3-V Input Integrated Switching Regulator |
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