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参数资料
| 型号： | PT6673P |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.25 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, SMA14 |
| 封装： | VERTICAL MOUNT PACKAGE-14 |
| 文件页数： | 3/6页 |
| 文件大小： | 134K |
| 代理商： | PT6673P |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT6670 Series
Adjusting the Output Voltage of the PT6670
Series Boost Voltage ISR
The Power Trends PT6670 ISRs are a series of convert-
ers that operate from a 3.3V or 5V input bus voltage. In
each case, the output voltage can be adjusted higher or
lower than the factory trimmed pre-set voltage. Adjust-
ment requires the addition of a single external resistor.
Table 1 gives the permissible adjustment range for each
model in the series as V
a(min) and Va(max) respectively.
Adjust Up:
To increase the output, add a resistor
R2 between pin 14 (V
o Adjust) and pins 7-10 (GND).
Adjust Down:
Add a resistor (R1), between pin 14
(V
o Adjust) and pin 1 (Remote Sense).
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 (R1) or R2
location. Place the resistor as close to the ISR as possible.
2. Do not exceed the maximum advised adjustment voltage.
Doing so could over stress the part.
3. Never connect capacitors to the V
o Adjust control pin. Any
capacitance added to this pin will affect the stability of the
ISR.
4. In the case of the PT6671, when the output is adjusted
lower than the pre-trimmed output, the maximum input
voltage to the ISR should not exceed (V
0 – 0.5)V.
The adjust up and adjust down resistor values can also be
calculated using the following formulas. Be sure to select
the correct formula parameters from Table 1 for the model
being adjusted.
(R1)
=
Ko (Va – 2.5)
– Rs k
2.5 (Vo – Va)
R2
=
Ko
– Rs k
Va – Vo
Where:
Vo = Original output voltage
Va = Adjusted output voltage
Ko = The multiplier constant in Table 1
Rs = The series resistance from Table 1
Table 1
PT6670 ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt #
3.3V Bus
PT6671
PT6672
PT6673
5.0V Bus
PT6675
PT6674
Vo(nom)
5.0V
9.0V
12.0V
Va(min)
3.8V
8.2V
9.6V
Va(max)
5.5V
9.2V
12.8V
Ko (Vk
)
25.0
48.75
47.41
Rs (k
)
4.99
80.6
54.9
Figure 1
PT6670
11,12,13
14
7,8,9,10
4,5,6
Vin
V o
G N D
Vo(adj)
Vsense
1
C
out
+
C
in
+
L
O
A
D
(R1)
Adj Down
R2
Adjust
Up
Vin
COM
Vo
R1 = (Blue)
R2 = Black
Table 2
PT6670 ADJUSTMENT RESISTOR VALUES
Series Pt #
3.3V Bus
PT6671
PT6672
PT6673
5.0V Bus
PT6675
PT6674
Vo(nom)
5.0V
9.0V
12.0V
Va(req’d)
3.8
(5.8)k
8.2
(58.3)k
3.9
(7.7)k
8.4
(111.0)k
4.0
(10.0k
8.6
(217.0)k
4.1
(12.8)k
8.8
(534.0)k
4.2
(16.3)k
9.0
4.3
(20.7)k
9.2
163.0k
4.4
(26.7)k
9.4
4.5
(35.0)k
9.6
(1.2)k
4.6
(47.5)k
9.8
(8.0)k
4.7
(68.3)k
10.0
(16.2)k
4.8
(110.0)k
10.2
(26.2)k
4.9
(235.0)k
10.4
(38.7)k
5.0
10.6
(54.8)k
5.1
245.0k
10.8
(76.3)k
5.2
120.0k
11.0
(106.0)k
5.3
78.3k
11.2
(151.0)k
5.4
57.5k
11.4
(226.0)k
5.5
45.0k
11.6
(376.0)k
11.8
(827.0)k
12.0
12.2
182.0k
12.4
63.3k
12.6
24.1k
12.8
4.4k
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