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參數(shù)資料
| 型號： | PT6729N |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 192K |
| 代理商： | PT6729N |
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 V
a
(min) and
V
a
(max).
Adjust Up:
An increase in the output voltage is obtained by
adding a resistor R
2
, between pin 1 (V
o
Adjust) and pin 7
(Remote Sense GND).
Adjust Down:
and pin 17 (Remote Sense V
out
).
Add a resistor
(R
1
)
, between pin 1 (V
o
Adjust)
Refer to Figure 1 and Table 2 for both the placement and value
of the required resistor, either
(R
1
)
or R
2
as appropriate.
The values of
(R
)
[adjust down], and R
[adjust up], can
also be calculated using the following formulas.
R
o
( V
a
–V
r
)
V
o
– V
a
(R
1
)
=
– R
s
k
R
o
·V
r
V
a
– V
o
– R
s
k
R
2
=
Where: V
o
= Original output voltage
= Adjusted output voltage
= The reference voltage (Table 1)
R
o
= The multiplier resistance (Table 1)
R
s
= The internal series resistance (Table 1)
V
a
V
r
Figure 1
Notes:
1. Use only a single 1% resistor in either the
(R
1
)
or R
2
location. Place the resistor as close to the regulator as
possible.
2. Never connect capacitors from V
o
Adjust to either GND,
V
out
, or the Remote Sense pins. Adding capacitance to the
V
o
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
(R
1
)
and R
2
may then be connected
from ‘V
o
Adjust’ to either V
out
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) |
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|---|---|
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| PT6801B | 制造商:Texas Instruments 功能描述:- Trays |
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