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参数资料
| 型号： | PTB48580AAH |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 2-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | DIP-8 |
| 文件页数： | 11/13页 |
| 文件大小： | 394K |
| 代理商： | PTB48580AAH |
Application Notes
For technical support and further information visit http://power.ti.com
Adjusting the Output Voltages of the
PTB48580 Series of DC/DC Converters
The PTB48580 series of DC/DC converters produce a
balanced pair of complementary output voltages. They
are identified +VO and -VO , respectively. The magnitude
of both output voltages can be adjusted together as a
pair, higher or lower, by up to ±10% of their nominal. The
adjustment method uses a single external resistor. 1 The
value of the resistor determines the magnitude of the
adjustment, 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 (3) of both output
voltages, place a resistor R1 between ±V
O Adj (pin 7) and
the -V
O (pin 8) voltage rail; see Figure 1-1(a).
Figure 1-1b
PTB48580 Series
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.
R
1 [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.
3. When the output voltage is adjusted higher than the
nominal output voltage the load current must not exceed
the module’s maximum power rating of 30 W. For example,
when the PTB48580A is adjusted to ±6 V (12 V in the
single output configuration), the load current is limited to
2.5 A.
R1
Adjust Up
+VO
±VO Adj
+VO
PTB48580
8
5
7
–VO
–VO
COM
6
(R2)
Adj Down
+VO
±VO Adj
+VO
PTB48580
8
5
7
–VO
–VO
COM
6
Table 1-1
ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt. No.
PTB48580A
PTB48580B
V
O (nom)
5 V
12 V
V
A (min)
3.5 V
6.5 V
V
A (max)
(3)
6 V
13.4 V
V
R
2.495 V
R
O (k)
7.5
18.2
R
S (k
)
9.09
16.9
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| PTB48580BAS | 功能描述:直流/直流开关转换器 .+/-12V 30W Comp Out put DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| PTB48580BAZ | 功能描述:DC/DC转换器 +/-12 V 30-W Comp Output DC/DC Conv RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
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