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參數(shù)資料
| 型號： | PT6511R |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 8 A SWITCHING REGULATOR, 725 kHz SWITCHING FREQ-MAX, PSMA14 |
| 封裝： | SIP-14 |
| 文件頁數(shù)： | 11/11頁 |
| 文件大?。?/td> | 222K |
| 代理商： | PT6511R |
Application Notes
For technical support or further information, visit http://power.ti.com
PT6510 Series
Adjusting the Output Voltage of the
PT6510 5V/3.3V Bus Converters
The output voltage of the PT6510 series switching regula-
tors may be adjusted higher or lower than the factory
trimmed pre-set voltage with the addition of a single
external resistor. Table 4-1 gives the allowable adjust-
ment range for each model in the series as Va (min) and
Va (max).
Adjust Up:
An increase in the output voltage is obtained
by adding a resistor R2, between Vo Adjust (pin 14) and
GND (pins 7-10).
Adjust Down:
Add a resistor (R1), between Vo Adjust
(pin 14) and Vout (pins 11-13).
Refer to Figure 4-1 and Table 4-2 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 Vo Sense pin. Any capacitance
added to the Vo Adjust pin will affect the stability of
the ISR.
3. If the remote sense feature is used, connecting the
resistor (R1) between Vo Adjust (pin 14) and Vo Sense
(pin 1) can benefit load regulation.
4. The minimum input voltage required by the part is
Vout + 1.2 or Vin(min) from Table 4-1, whichever is
higher.
Figure 4-1
The values of (R
1) [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: Vo = Original output voltage
Va = Adjusted output voltage
Ro = The resistance value in Table 4-1
Rs = The series resistance from Table 4-1
Table 4-1
PT6510 ADJUSTMENT AND FORMULA PARAMETERS
Series Pt #
PT6515
PT6512
PT6516
PT6513
PT6511
PT6514
Vo (nom)
1.2
1.5
1.8
2.5
3.3
3.6
Va (min)
1.14
1.27
1.4
1.8
2.25
2.5
Va (max)
2.35
2.65
2.95
3.5
4.2
4.3
Ro (k
)
2.49
4.99
12.1
10
Rs (k
)
2
4.22
12.1
Vin(min)
3.1
4.5
C
in
+
C
out
+
(R1)
Adj Down
R2
Adjust Up
V
out
COM
Vin
COM
PT6510
11–13
14
7–10
4–6
V
in
V
out
GND
V
o(adj)
STBY
3
V
o(Sense)
1
L
O
A
D
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