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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(kāi)關(guān)穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 8/11頁(yè) |
| 文件大?。?/td> | 203K |
| 代理商： | PT5800 |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT5800 & PT5810 Series
Adjusting the Output Voltage of the PT5800 &
PT5810 Step-Down Series of Regulators
Using Margin Up/ Margin Down
The
Margin Up*
(pin 4) and
Margin Dn*
(pin 3) control
inputs allow the output voltage to be easily adjusted by
up to ±5% of the nominal set-point voltage. To activate,
simply connect the appropriate control input to the
Sense(–)
(pin 8), or the local starpoint ground. Either a logic level
MOSFET or a p-channel JFET is recommended for this
purpose. For further information see the related applica-
tion note on this feature.
Using the
‘
V
Adjust
’
Control
For a more permanent and precise adjustment, use the
Vo Adjust
control (pin 1). The
V
o
Adjust
control allows
adjustment in any increment by up to ±10% of the set-
point. The adjustment method requires the addition of a
single external resistor. Table 5-1 gives the allowable
adjustment range for each model of the series as V
a
(min)
and V
a
(max). The value of the external resistor can either
be calculated using the formulas given below, or simply
selected from the range of values provided in Table 5-2.
Refer to Figure 5-1 for the placement of the required
resistor. Use the resistor R
1
to adjust up, and the resistor
(R
2
)
to adjust down.
Adjust Up: An increase in the output voltage is obtained
by adding a resistor R
1
, between
V
o
Adjust
(pin 1) and
Sense(–)
(pin 8). See Figure 5-1.
Adjust Down: Add a resistor
(R
2
)
, between
V
o
Adjust
(pin 1)
and
Sense(+)
(pin 18). See Figure 5-1.
Notes:
1. Use a 1% (or better) tolerance resistor in either the R
1
or
(R
2
)
location. Place the resistor as close to the ISR as
possible.
2. Never connect capacitors from
V
o
Adjust
to either
GND
or
V
out
. Any capacitance added to the
V
o
Adjust
pin will affect
the stability of the ISR.
3. If the remote sense feature is not being used, the adjust
resistor
(R
2
)
can be connected to
V
out
, (pins 14-17) instead
of
Sense (+)
.
Figure 5-1; V
o
Adjust Resistor Placement
V
o
Adjust Resistor Calculations
The values of R
1
[adjust up] and
(R
2
)
[adjust down] can
also be calculated using the following formulas. Again, use
Figure 5-1for the placement of the required resistor;
either R
1
or
(R
2
)
as appropriate.
R
1
=
V
r
· R
o
V
a
– V
o
– 24.9
k
(R
2
)
=
R
o
(V
a
– V
r
)
V
o
– V
a
– 24.9
k
Where: V
o
= Original output voltage
= Adjusted output voltage
= The reference voltage in Table 5-1
R
o
= The resistance constant in Table 5-1
V
a
V
r
Table 5-1
ISR OUTPUT VOLTAGE ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt. No.
5.0V Bus
PT5801
PT5802
3.3V Bus
N/A
PT5812
4
PT5803
PT5813
PT5804
PT5814
PT5805
PT5815
PT5806
PT5816
Vo (nom)
Va (min)
Va (max)
Vr
Ro (k
)
# The PT5812 should not be adjusted higher than its nominal output voltage of 2.5V See note 4.
3.3V
2.6V
3.63V
0.8V
10.2
2.5V
2.0V
2.8V #
0.8V
10.7
1.8V
1.52V
2.1V
0.8V
10.2
1.5V
1.31V
1.82V
0.8V
9.76
1.2V
1.1V
1.52V
0.8V
10.0
1.0V
0.94V
1.32V
0.8V
10.2
PT5800/5810
9
–
13
1
18
14
–
17
8
C
330μF
+
GND
V
OUT
Sense (+) [Note 3]
Sense (
–
)
(R
)
Adj Down
V
O
Adj
GND
Sense(+)
Sense(
–
)
V
OUT
R
Adjust Up
4. The PT5812 may not be adjusted higher than the
nominal output voltage of 2.5V. There is insufficient
input voltage between V
in
and V
out
to accommodate
an increase in the output voltage.
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