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參數(shù)資料
| 型號(hào)： | PT6948A |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | XPHASE Phase IC with Opti-Phase OVP with overtemp detect. The IR3087 Phase IC combined with an IR XPhase TM Control IC provides a full featured and flexible way to implement power solutions for the latest high performance CPUs and ASICs.; Similar to IR3087M with Lead Free Packaging |
| 中文描述： | 開(kāi)關(guān)電源控制器 |
| 文件頁(yè)數(shù)： | 7/9頁(yè) |
| 文件大小： | 190K |
| 代理商： | PT6948A |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
Adjusting the Output Voltages of the
PT6940 Dual-Output ISRs
Each output voltage from the PT6940 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 each 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
2
between pin 2 (Vo
1
Adjust) and pins 7-12 (GND)
3
.
Vo
1
Adjust Down:
Add a resistor
(R
1
)
, between pin 2
(Vo
1
Adjust) and pin 3 (Vo
1
Sense).
Vo
2
Adjust Up:
Add a resistor R
4
between pin 27
(Vo
2
Adjust) and pins 17–22 (GND).
Vo
2
Adjust Down:
Add a resistor
(R
3
)
between pin 27
(Vo
2
Adjust) and pin 26 (Vo
2
Sense).
Refer to Figure 1 and Table 2 for both the placement and value of
the required resistor.
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.
(R
1
)
or
(R
3
)
=
10 (V
a
– 0.9
)
V
o
– V
a
– R
s
k
R
2
or R
4
=
9
– R
s
k
V
a
– V
o
Figure 1
Where: V
o
= Original output voltage, (Vo
1
or Vo
2
)
= Adjusted output voltage
= The series resistance from Table 1
V
a
R
s
Notes:
1. Use only a single 1% resistor in either the
(R
1
)
or R
2
location to adjust Vo
1
, and in the
(R
3
)
or R
4
location to
adjust Vo
2
. Place the resistor as close to the module as
possible.
2. Vo
2
must always be at least 0.3V lower than Vo
1
.
3. When adjusting Vo
1
higher than the factory pre-set
output voltage the minimum input voltage must be
revised as follows.
Vo
1
=3.3V:
V
in
(min) = (Vo
1
+ 1)V or 4.5V, whichever is greater.
Vo
1
=2.5V:
Vo
1
=2.5V is the maximum output voltage allowed for
operation off a 3.3V input bus. If Vo
1
is adjusted above
2.5V, the input voltage must be a minimum of 4.5V.
4. Vo
1
and Vo
2
may be adjusted down to an alternative bus
voltage by making,
(R
1
)
or
(R
3
)
respectively, a zero ohm
link. Refer to the Table 1 footnotes for guidance.
5. 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.
PT6940 Series
PT6940
Co
1
+
13
–
16
4
–
6
23
–
25
C
IN
26
Co
2
+
3
Vo
1
Vo
2
L
O
A
D
L
O
A
D
Vo
2
Sense
Vo
1
Sense
V
IN
GND
GND
+
7
–
12
17
–
22
R2
(R1)
(R3)
R4
Vin
V
1
Adj
V
2
Adj
Vo
1
Vo
2
V
1
Sns
V
2
Sns
27
2
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