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參數(shù)資料
| 型號(hào)： | PT6508F |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 20 A SWITCHING REGULATOR, 725 kHz SWITCHING FREQ-MAX, SMA14 |
| 封裝： | SURFACE MOUNT PACKAGE-14 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大小： | 231K |
| 代理商： | PT6508F |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT6500 Series
Adjusting the Output Voltage of the
PT6500 5V/3.3V Bus Converters
The output voltage of the Power Trends PT6500 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:
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 Vo adjust to either
GND, Vout, or the Remote Sense pin. Any
capacitance added to the Vo 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 (Vo
adjust) and pin 1 (Remote Sense) can benefit load
regulation.
4. The minimum input voltage required by the part is
Vout + 1.2 or Vin(min) from Table 1, whichever is
higher.
Figure 1
C
1
+
C
2
+
(R1)
Adj Down
R2
Adjust
Up
Vo
COM
Vin
COM
PT6500
11,12,13
14
7,8,9,10
4,5,6
V
in
V
out
GND
V
o(adj)
STBY
3
V
o(sense)
1
L
O
A
D
The values of (R1) [adjust down], and R2 [adjust up], can
also be calculated using the following formulae.
Ro (Va – 1.0)
(R1)
=
(Vo – Va)
– Rs k
Ro
– 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
Table 1
PT6500 ADJUSTMENT AND FORMULA PARAMETERS
Series Pt #
PT6505
PT6507
PT6502
PT6508
PT6506
PT6503
PT6501
PT6504
Vo (nom)
1.2
1.3
1.5
1.7
1.8
2.5
3.3
3.6
Va (min)
1.14
1.19
1.27
1.36
1.4
1.8
2.25
2.5
Va (max)
2.35
2.45
2.65
2.85
2.95
3.5
4.2
4.3
Ro (k
)
2.49
4.99
12.1
10.0
Rs (k
)
2.0
4.22
12.1
Vin(min)
3.1
4.5
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