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參數(shù)資料
| 型號： | PT6905 |
| 英文描述： | (-)5.2Vout 12W 3.3V-Input Adjustable Plus to Minus Voltage Converter |
| 中文描述： | （ - ）5.2Vout 12瓦3.3V的輸入可調(diào)加到負電壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 3/5頁 |
| 文件大小： | 123K |
| 代理商： | PT6905 |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT6900/6910 Series
Adjusting the Output Voltage of the PT6900/PT6910
Positive to Negative Converter Series
The negative output voltage of the Power Trends
PT6900 Series ISRs may be adjusted higher or lower
than the factory trimmed pre-set voltage with the addi-
tion of a single external resistor. Table 1 gives the
allowable adjustment range for each model in the series
as V
a
(min) and V
a
(max).
An increase in the output voltage is
obtained by adding a resistor R2, between pin 2 (V
o
ad-
just) and pin 8 (Remote Sense GND).
Adjust Up:
Adjust Down:
adjust) and pin 22 (Remote Sense V
o
).
Add a resistor (R1), between pin 2 (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. Only a single 1% resistor is required in either the
(R1)
or
R2 location. Do not use
(R1)
and R2 simultaneously.
Place the resistor as close to the ISR as possible.
2. Never connect capacitors from V
adjust to either GND,
V
out
, or the Sense pins. Any capacitance added to the
V
adjust pin will affect the stability of the ISR.
3. If the sense pins are not being used, the resistors
(R1)
and
R2 can be connected to V
and GND respectively.
4. An increase in the output voltage must be accompanied by
a corresponding reduction in the maximum output current.
The revised maximum output current must be reduced to
the equivalent of 12Watts.
i.e.
I
out
(max)
=
12
V
a
Adc,
where V
a
is the adjusted output voltage.
Figure 1
The respective values of
(R1)
[adjust down], and R2 [ad-
just up], can also be calculated using the following formulas.
(R1)
= 24.9 (V
a
– V
r
)– R
s
k
(V
o
– V
a
)
R2
r
– R
s
= 24.9 V
a
– V
o
)
k
Where:
V
o
V
a
V
r
R
s
= Original output voltage
= Adjusted output voltage
= Reference voltage in Table 1
= The resistance given in Table 1
Table1
PT6900/PT6910 ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt #
5.0V Bus
PT6903/13
3.3V Bus
PT6901/11
PT6904/14
PT6902/12
PT6905/15
Vo (nom)
Va (min)
Va (max)
Vr
Rs (k
)
-1.5V
-1.2V
-3.4V
-1.0V
12.7
-2.0V
-1.4V
-4.5V
-1.0V
10.0
-5.2V
-2.7V
-6.5V
-0.92V
17.4
C
in
+
C
out
+
R2
(Up)
(R1)
(Down)
COM
COM
Vout(-)
+Vin
PT6900
16 - 21
2
9 - 15
3 - 7
+Vin
-Vo
GND
Vo(adj)
Vo(sense)
22
8
GND(sense)
L
O
A
D
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