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參數(shù)資料
| 型號： | PT6346C |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 6 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA12 |
| 封裝： | SIP-12 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 199K |
| 代理商： | PT6346C |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT6340 Series
Adjusting the Output Voltage of the PT6340
Excalibur
6 A, 12 V Bus Step-Down ISRs
The output voltage of the PT6340 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 for either series as Va (min) and Va (max).
Adjust Up:
An increase in the output voltage is obtained by
adding a resistor R2, between pin 12 (Vo adj) and pins 5-8
(GND).
Adjust Down:
Add a resistor (R1), between pin 12 (Vo adj) and
pins 9-11 (Vo).
Figure 1
The values of (R1) [adjust down], and R2 [adjust up], can
also be calculated using the following formulas. Refer to
Figure 1 and Table 2 for both the placement and value of the
required resistor; either (R1) or R2 as appropriate.
(R1)
=
Ro (Va – Vr)
– Rs
k
Vo – Va
R2
=
Vr Ro
– Rs
k
Va – Vo
Where:
Vo = Original output voltage
Va = Adjusted output voltage
Vr = Reference voltage (Table 1)
Ro = Resistance constant (Table 1)
Rs = Internal series resistance (Table 1)
Table 1
ISR ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt #
PT6341
PT6342
PT6343
PT6244
PT6345
PT6346
Vo (nom)
5.0
3.3
2.5
1.8
1.5
1.2
Va (min)
4.0
2.8
2.2
1.7
1.45
1.1
Va (max)
5.5
3.8
3.0
2.3
2.0
1.45
Vr (V)
1.27
0.8
Ro (k
)
10.0
Rs (k
)
24.9
R2
Adjust Up
C
2
+V
O
COM
+V
IN
+
(R1)
Adj Down
PT6340
2,3,4
5–812
9,10,11
Vin
V o
Vo(adj)
GND
C
1
+
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 adj to either GND or
Vout. Any capacitance added to the Vo adjust pin will
affect the stability of the ISR.
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