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參數(shù)資料
| 型號(hào)： | PT6627R |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁(yè)數(shù)： | 3/6頁(yè) |
| 文件大小： | 129K |
| 代理商： | PT6627R |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT6620 Series
Adjusting the Output Voltage of the
PT6620 7Amp12V Bus Converter Series
The output voltage of the Power Trends PT6620 Series
ISRs may be adjusted higher or lower than the factory
trimmed pre-set voltage with the addition of a single
external resistor. Table 1 accordingly gives the allowable
adjustment range for each model in the series as V
a
(min)
and V
a
(max).
Adjust Up:
obtained by adding a resistor R2, between pin 14 (V
o
ad-
just) and pins 7-10 (GND).
An increase in the output voltage is
Adjust Down:
adjust) and pins 11-13 (V
out
).
Add a resistor (R1), between pin 14 (V
o
Refer to Figure 1 and Table 2 for both the placement and value
of the required resistor, either
(R1)
or R2 as appropriate.
Notes:
1. Use only a single 1% resistor in either the
(R1)
or R2
location. Place the resistor as close to the ISR as possible.
2. Never connect capacitors from V
o
adjust to either GND,
V
out
, or the Remote Sense pin. Any capacitance added to
the V
o
adjust pin will affect the stability of the ISR.
3. If the Remote Sense feature is being used, connecting the
resistor
(R1)
between pin 14 (V
o
adjust) and pin 1 (Remote
Sense) can benefit load regulation.
4. The minimum input voltage required by the part is
V
out
+ 3, or 9V, whichever is higher.
Figure 1
C
in
+
C
out
+
(R1)
Adj Down
R2
Adjust
Up
Vo
COM
COM
Vin
PT6620
11,12,13
14
7,8,9,10
4,5,6
Vin
Vo
GND
Vo(adj)
STBY
3
Vsense
1
L
O
A
D
The values of
(R1)
[adjust down], and R2 [adjust up], can
also be calculated using the following formulae.
R
o
(V
a
– 1.25)
(V
o
– V
a
)
(R1)
=
– R
s
k
1.25 R
o
V
a
- V
o
– R
s
k
R2
=
Where: V
o
= Original output voltage
= Adjusted output voltage
= The resistance value in Table 1
= The series resistance from Table 1
V
a
R
o
R
s
Table 1
PT6620 ADJUSTMENT AND FORMULA PARAMETERS
Series Pt #
PT6622
PT6623
PT6621
PT6624
PT6625
PT6626
Vo (nom)
Va (min)
Va (max)
Ro (k
)
Rs (k
)
1.5V
1.4V
2.7V
4.99
2.49
2.5V
1.9V
3.7V
10.0
4.99
3.3V
2.3V
4.5V
12.1
12.1
3.6V
2.5V
4.8V
12.1
12.1
5.0V
2.9V
6.5V
16.2
12.1
9.0V
5.2V
10.0V
12.1
12.1
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