參數(shù)資料
型號(hào): PT4842
英文描述: 12V/3.3V/1.8V 48V-Input 62-Watt Triple-Output DC/DC Converter
中文描述: 12V/3.3V/1.8V 48V的輸入62瓦三輸出DC / DC變換器
文件頁(yè)數(shù): 11/14頁(yè)
文件大小: 216K
代理商: PT4842
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
Adjusting the Output Voltage of the PT4840
Dual Output Voltage DC/DC Converters
The Vo
2
and Vo
3
output voltages from the PT4840 se-
ries of DC/DC converters can be independantly adjusted
by up to ±10% from their factory pre-set voltage. The
method of adjustment uses a single external resistor.
1
The value of the resistor determines the magnitude of
adustment, and the placement of the resistor determines
the direction of adjustment (up or down). The resistor
value can be calculated directly from a simple formula.
The constants are given in Table 1. Alternatively, Table 2
provides the resistor values for a select number of output
voltages. The placement of each resistor is as follows.
Vo
2
Adjust Up:
To increase the output, add a resistor R
1
between pin 17 (Vo
2
Adjust) and pin 18 (COM).
Vo
2
Adjust Down:
Add a resistor
(R
2
)
, between pin 17
(Vo
2
Adjust) and pin 16 (+Vo
1
).
Vo
3
Adjust Up:
Add a resistor R
3
between pin 21
(Vo
3
Adjust) and pins 20 (COM).
Vo
3
Adjust Down:
Add a resistor
(R
4
)
between pin 21
(Vo
3
Adjust) and pin 22 (+Vo
3
).
Refer to Figure 1 for further information on resistor
placement.
Figure 1
Notes:
1. Use only a single 1% resistor in either the R
1
or
(R
2
)
location to adjust Vo
2
, and in the R
3
or
(R
4
)
location to
adjust Vo
3
. Place the resistor as close to the ISR as
possible.
2. Never connect capacitors to either the Vo
2
Adjust or
Vo
3
Adjust pins. Any capacitance added to these control
pins will affect the stability of the respective regulated
output.
The adjust resistor values may be calculated. Use the
applicable formula and select the appropriate constants
from Table 1 for the output and model being adjusted.
R
1
or R
3
=
R
o
· V
r
– R
s
k
V
a
– V
o
(R
2
)
or
(R
4
)
=
R
o
(V
a
– V
r
)
V
o
– V
a
– R
s
k
Where: V
o
= Original output voltage, (Vo
2
or Vo
3
)
V
a
= Adjusted output voltage
V
r
= The reference voltage from Table 1
R
o
= The resistance value in Table 1
R
s
= The series resistance from Table 1
PT4840 Series
+V
IN
V
IN
+Vo
1
+Vo
2
+Vo
3
PT4840
1
2
11
15, 16
22, 23
3
Vo
1
COM
COM
Vo
2
Vo
3
+V
IN
-V
IN
EN 1
Vo
2
adj
Vo
3
adj
17
21
C
OUT 1
C
OUT 3
C
OUT 2
C
IN
4
EN 2
(R
4
)
Adj Down
R
3
Adjust Up
(R
2
)
Adj Down
R
1
Adjust Up
12, 13
18
20
COM
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