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參數(shù)資料
| 型號(hào)： | PTB48600AAS |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 2-OUTPUT 85 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | DIP-8 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大小： | 387K |
| 代理商： | PTB48600AAS |
Application Notes
For technical support and further information visit http://power.ti.com
Adjusting the Output Voltages of the
PTB48600 Series of DC/DC Converters
The PTB48600 DC/DC converter produces a balanced
pair of complementary output voltages. They are identi-
fied +VO and -VO, respectively. The magnitude of both
output voltages can be adjusted together as a pair, higher
or lower. The adjustment method uses a single external
resistor. 1 The value of the resistor determines the adjust-
ment magnitude, and its placement determines whether
the magnitude is increased or decreased. The resistor
values can be calculated using the appropriate formula
(see below). The formula constants are given in Table 1-1.
The placement of each resistor is as follows.
Adjust Up:
To increase the magnitude of both output
voltages, place a resistor R1 between ±VO Adj (pin 7) and
the -V
O (pin 8) voltage rail; see Figure 1-1(a).
Figure 1-1b
PTB48600
Calculation of Resistor Adjust Values
The value of the adjust resistor is calculated using one of
the following equations. Use the equation for R1 to adjust
up, or (R2) to adjust down.
R1 [Adjust Up]
=
V
R RO
– R
S
k
2 (V
A – VO )
(R2) [Adjust Down] =
Ro (2 VA – VR ) – RS k
2 (VO – VA )
Where: VO = Magitude of the original ±VO
VA = Magnitude of the adjusted voltage
VR = The reference voltage from Table 1-1
RO = The resistance value in Table 1-1
RS = The series resistance from Table 1-1
Figure 1-1a
Adjust Down:
To decrease the magnitude of both output
voltages, add a resistor (R2), between ±V
O Adj (pin 7)
and the +V
O (pin 5) voltage rail; see Figure 1-1(b).
Notes:
1. A 0.05-W rated resistor may be used. The tolerance
should be 1%, with a temperature stability of 100 ppm/°C or
better. Place the resistor in either the R1 or (R2)
location, as close to the converter as possible.
2. Never connect capacitors to the ±V
O Adj pin. Capacitance
added to this pin can affect the stability of the regulated
output.
R1
Adjust Up
+VO
±VO Adj
+VO
PTB48600
8
5
7
–VO
–VO
COM
6
(R2)
Adj Down
+VO
±VO Adj
+VO
PTB48600
8
5
7
–VO
–VO
COM
6
Table 1-1
ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt. No.
PTB48600A
V
O (nom)
5 V
V
A (min)
3.31 V
V
A (max)
6 V
V
R
2.495 V
R
O (k)
7.5
R
S (k
)
9.09
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