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參數(shù)資料
| 型號： | PT6728C |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 13 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA17 |
| 封裝： | SIP-17 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 217K |
| 代理商： | PT6728C |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT6725 Series
Adjusting the Output Voltage of the PT6725
Series of Integrated Switching Regulators
The PT6725 series of ISRs are non-programmable
versions of the PT6721/2 Excalibur regulators. The
regulators have a fixed output voltage, which may be
adjusted higher or lower than the factory pre-set voltage
using a single external resistor. Table 1 gives the adjust-
ment range for each model in the series as Va (min) and
Va (max).
Adjust Up:
An increase in the output voltage is obtained by
adding a resistor R2, between pin 1 (Vo Adjust) and pin 7
(Remote Sense GND).
Adjust Down:
Add a resistor (R1), between pin 1 (Vo Adjust)
and pin 17 (Remote Sense Vout).
Refer to Figure 1 and Table 2 for both the placement and value
of the required resistor, either (R1) or R2 as appropriate.
The values of (R
1) [adjust down], and R2 [adjust up], can
also be calculated using the following formulas.
Ro ( Va –Vr )
(R1)
=
Vo – Va
– Rs
k
Ro Vr
– Rs
k
R2
=
Va – Vo
Where: Vo = Original output voltage
Va = Adjusted output voltage
Vr = The reference voltage (Table 1)
Ro = The multiplier resistance (Table 1)
Rs = The internal series resistance (Table 1)
Figure 1
Notes:
1. Use only a single 1% resistor in either the (R1) or R2
location. Place the resistor as close to the regulator as
possible.
2. Never connect capacitors from Vo Adjust to either GND,
Vout, or the Remote Sense pins. Adding capacitance to the
Vo Adjust pin will affect the stability of the ISR.
3. If the Remote Sense feature is not being used, pin 7 must
be connected to pin 8 for optimum output voltage
accuracy. The resistors (R1) and R2 may then be connected
from ‘Vo Adjust’ to either Vout or GND respectively.
L
O
A
D
(R1)
Adj Down
R2
Adjust Up
C
out
+
C
in
+
COM
+5V
Vo
COM
PT6725
Sns(+)
Sns(-)
V
out
GND
Vo(adj)
V
in
Stby*
13–16
17
7
1
8–12
4,5,6
2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT6728N | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.5Vout 14A 12V-Inp CU Case Adj 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 |
| PT6729 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:14-A 12V-Input Adjustable Integrated Switching Regulator |
| PT6729A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| PT6729C | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| PT6729N | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.2V 14A 12V-Input Adjustable 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 |
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