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參數(shù)資料
| 型號(hào)： | PT5800 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 18-A 5-V Input Adjustable Integrated Switching Regulator |
| 中文描述： | 18 - 5 - V輸入可調(diào)集成開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大小： | 203K |
| 代理商： | PT5800 |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
Using the Margin Up/Down Controls on the
PT5800 & PT5810 Regulator Series
The PT5800 & PT5810 series of integrated switching
regulator modules incorporate
Margin Up*
(pin 4) and
Margin Dn*
(pin 3) control inputs. These controls allow the
output voltage set point to be momentarily adjusted
1
,
either up or down, by a nominal 5%. This provides a
convenient method for dynamically testing the load
circuit’s power supply voltage over its operating margin
or range. Note that the ±5% change is also applied to any
adjustment of the output voltage, if made, using the
V
o
Adjust
(pin 1).
The 5% adjustment is made by driving the appropriate
margin control input directly to the ground reference at
Sense(-)
(pin 8)
2
. An low-leakage open-drain device, such as
a MOSFET or a p-channel JFET is recommended for this
purpose. Adjustments of less than 5% can also be accom-
modated by adding series resistors to the control inputs
(See Figure 6-1). The value of the resistor can be selected
from Table 6-1, or calculated using the following formula.
Resistor Value Calculation
To reduce the margin adjustment to something less than
5%, series padding resistors are required (See R
D
and
R
U
in Figure 6-1). For the same amount of adjustment,
the resistor value calculated for R
U
and R
D
will be the
same. The formulas is as follows.
R
U
/R
D
=
499
%
– 99.8
k
Where
% = The desired amount of margin adjust in
percent.
Notes:
1. The
Margin Up*
and
Margin Dn*
controls were not
intended to be activated simultaneously. If they are
their affects on the output voltage may not completely
cancel, resulting in a slight shift in the output voltage
set point.
2. When possible use the
Sense(-)
(pin 8) as the ground
reference. This will produce a more accurate adjustment
of the output voltage at the load circuit terminals.
GND
(pins 9-13) can be used if the
Sense(-)
pin is connected
to
GND
near the regulator.
C
out
+
C
in
+5V
GND
MargDn
L
O
A
D
Q
2
Sense(
–
)
+V
OUT
GND
PT5800
18
14
–
17
8
2
9
–
13
5, 6, 7
V
OUT
V
IN
GND
SNS(+)
SNS(
–
)
INHIBIT*
Q
1
4
3
MARG
DN*
MARG
UP*
+
MargUp
0V
+V
o
R
D
R
U
0V
Figure 6-1; Margin Up/Down Application Schematic
Table 6-1; Margin Up/Down Resistor Values
PADDING RESISTOR VALUES
% Adjust
R
U
/ R
D
5
0.0k
4
24.9k
3
66.5k
2
150.0k
1
397.0k
PT5800 & PT5810 Series
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