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參數(shù)資料
| 型號(hào)： | PT6627P |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 6 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, PSMA14 |
| 封裝： | PLASTIC, VERTICAL MOUNT PACKAGE-14 |
| 文件頁(yè)數(shù)： | 14/20頁(yè) |
| 文件大小： | 523K |
| 代理商： | PT6627P |
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Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT6620 Series
Adjusting the Output Voltage of the
PT6620 6 A, 12-V Bus Converter Series
The output voltage of the Power Trends PT6620 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
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 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 Vo Adjust (pin 14) and Remote Sense
(pin 1) can benefit load regulation.
4. The minimum input voltage required by the part is
Vout + 3, or 9 V, whichever is higher.
Figure 1
C
in
+
C
out
+
(R1)
Adj Down
R2
Adjust
Up
Vo
COM
Vin
PT6620
11,12,13
14
7,8,9,10
4,5,6
Vin
V o
GND
Vo(adj)
STBY
3
Vsense
1
L
O
A
D
The values of (R
1) [adjust down], and R2 [adjust up], can
also be calculated using the following formulae.
Ro (Va – 1.25)
(R1)
=
(Vo – Va)
– Rs
k
1.25 Ro
– Rs
k
R2
=
Va - Vo
Where: Vo = Original output voltage
Va = Adjusted output voltage
Rs = The series resistance from Table 1
Table 1
PT6620 ADJUSTMENT AND FORMULA PARAMETERS
Series Pt #
PT6622
PT6623
PT6621
PT6624
PT6625
PT6626
Vo (nom)
1.5 V
2.5 V
3.3 V
3.6 V
5 V
9.0 V
Va (min)
1.4 V
1.9 V
2.3 V
2.5 V
2.9 V
5.2 V
Va (max)
2.7 V
3.7 V
4.5 V
4.8 V
6.5 V
10 V
Ro (k
)
4.99
10.0
12.1
16.2
12.1
Rs (k
)
2.49
4.99
12.1
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