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參數(shù)資料
| 型號(hào)： | PT6985 |
| 英文描述： | 2.5V/1.2V. 9A 12V-Input Dual Output ISR |
| 中文描述： | 2.5V/1.2V。第9A 12V的輸入雙輸出ISR的 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 271K |
| 代理商： | PT6985 |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
Adjusting the Output Voltage of the PT6980
Dual-Output Voltage Regulators
Each output voltage from the PT6980 series of integrated
switching regulators (ISRs) can be independently adjusted
higher or lower than the factory trimmed pre-set voltage.
The voltages, Vo
1
and Vo
2
may be adjusted either up or
down using a single external resistor
1
. Table 1 gives the
adjustment range for both Vo
1
and Vo
2
for each model in
the series as V
a
(min) and V
a
(max). Note that Vo
2
must
always be lower than Vo
1
2
.
Vo
1
Adjust Up:
To increase the output, add a resistor R
4
between pin 16 (V
1
Adjust) and pins 7-11 (GND)
1
.
Vo
1
Adjust Down:
Add a resistor
(R
3
)
, between pin 16
(Vo
1
Adjust) and pin 1 (Vo
1
Sense)
1
.
Vo
2
Adjust Up:
Add a resistor R
2
between pin 23
(Vo
2
Adjust) and pins 7-11 (GND)
1
.
Vo
2
Adjust Down:
Add a resistor
(R
1
)
between pin 23
(Vo
2
Adjust) and pin 22 (Vo
2
Sense)
1
.
Refer to Figure 1 and Table 2 for both the placement and value of
the required resistor.
Notes:
1. Use only a single 1% resistor in either the
(R
3
)
or R
4
location to adjust Vo
1
, and in the
(R
1
)
or R
2
location to
adjust Vo
2
. Place the resistor as close to the ISR as
possible.
2. Vo
2
must always be at least 0.2V lower than Vo
1
.
Figure 1
C
1
+
C
2
+
C
3
+
R4
(R3)
(R1)
R2
L
O
A
D
L
O
A
D
Adj Down
Adjust Up
V
IN
COM
COM
Vo
2
Vo
1
PT6980
18 - 21
23
7 - 11
4,5,6
Vin
Vo
2
GND
Vo
2
(adj)
Vo
1
(sns)
1
16
Vo
1
(adj)
12 - 15
Vo
1
Vo
2
(sns)
22
STBY
3
Adjust Vo
1
Adjust Vo
2
3. Both the Vo
1
and Vo
2
may be adjusted down to an
alternative bus voltage by making,
(R
3
)
or
(R
1
)
respectively, a zero ohm link. Refer to the Table 1
footnotes for guidance.
4. Never connect capacitors to either the Vo
1
Adjust or
Vo
2
Adjust pins. Any capacitance added to these control
pins will affect the stability of the respective regulated
output.
5. Adjusting either voltage (Vo
1
or Vo
2
) may increase the
power dissipation in the regulator, and change the
maximum current available at either output. Consult
the note on p.2 of the data sheet regarding Vo
1
/Vo
2
loading.
The adjust up and adjust down resistor values can also be
calculated using the following formulas. Be sure to select
the correct formula parameter from Table 1 for the output
and model being adjusted.
10 (V
a
– V
r
)
V
o
– V
a
(R
1
)
or
(R
3
)
=
– R
s
k
(R
2
)
or
(R
4
)
=
10 · V
r
– R
s
k
V
a
– V
o
Where: V
o
= Original output voltage, (Vo
1
or Vo
2
)
= Adjusted output voltage
= The reference voltage from Table 1
= The series resistance from Table 1
V
a
V
r
R
s
PT6980 Series
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