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参数资料
| 型号： | PT6685G |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, SMA14 |
| 封装： | ROHS COMPLIANT, HORIZONTAL MOUNT PACKAGE-14 |
| 文件页数： | 3/6页 |
| 文件大小： | 160K |
| 代理商： | PT6685G |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT6680 Series
Adjusting the Output Voltage of the
PT6680 5Amp 18-36V Bus Converter Series
The output voltage of the Power Trends PT6680 Series
ISRs may be adjusted higher or lower than the factory
trimmed pre-set voltage with the addition of a single
external resistor 1. Table 1 gives the respective allowable
adjustment range for each model in the series as V
a (min)
and V
a (max).
Adjust Up:
An increase in the output voltage is
obtained by adding a resistor R2, between pin 14 (V
o ad-
just) and pins 7-10 (GND).
Adjust Down:
Add a resistor (R1), between pin 14 (V
o
adjust) and pins 11-13 (V
out).
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. For output voltages above 10.0Vdc, the maximum output
current must be limited to 4Adc.
5. Adjustments to the output voltage may place additional
limits on the input voltage for the part. The revised limits
must comply with the following requirements.
V
in (min)
= (V
out + 3)V or 18V,
whichever is higher.
V
in (max)
= (10 x V
out )V or 36V,
whichever is less.
The values of (R1) [adjust down], and R2 [adjust up], can
also be calculated using the following formulae.
Ro (Vo – 1.25)(Va – 1.25)
(R1)
=
1.25 (Vo – Va)
– Rs
k
Ro (Vo – 1.25)
– Rs
k
R2
=
Va - Vo
Where: V
o
= Original output voltage
V
a
= Adjusted output voltage
R
o
= The resistance value in Table 1
R
s
= The series resistance from Table 1
Figure 1
Table 1
PT6680 ADJUSTMENT AND FORMULA PARAMETERS
Series Pt #
PT6682
PT6681
PT6683
PT6684
PT6686
PT6685
Vo (nom)
2.5V
3.3V
5.0V
9.0V
12.0V
15.0V
Va (min)
1.8V
2.2V
3.0V
6.0V
9.0V
10.0V
Va (max)
4.3V
4.7V
6.5V
10.2V
13.6V
17.0V
Ro (k
)
4.99
4.22
2.49
2.02.02.0
Rs (k
)
2.49
4.99
12.7
C
in
+
C
out
+
(R1)
Adj Down
R2
Adjust
Up
Vo
COM
Vin
L
O
A
D
PT6680
11,12,13
14
7,8,9,10
4,5,6
Vin
V o
G N D
Vo(adj)
STBY
3
Vsense
1
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