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参数资料
| 型号： | PTN78060AAH |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 15 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, DIP-7 |
| 文件页数： | 18/19页 |
| 文件大小： | 589K |
| 代理商： | PTN78060AAH |
www.ti.com
APPLICATION INFORMATION
Adjusting the Output Voltage of the PTN78060A Wide-Output Adjust Power Modules
General
R
=54.9k
SET
W
1.25 V
|
V
-3V
O
-5.62kW
(1)
Input Voltage Considerations
GND
PTN78060A
6
1,7
2
Adj
GND
4
+
C2
C1
RSET
0.05W
1%
C3
V
O
V
O
V
I
V
I
SLTS245B – APRIL 2005 – REVISED AUGUST 2006
A resistor must be connected directly between the VO Adjust control (pin 4) and the output voltage (pin 7) to set
the output voltage lower than –3 V. The adjustment range is from –15 V to –3 V. If pin 4 is left open, the output
voltage defaults to the highest value, –3 V.
Table 1 gives the standard resistor value for a number of common voltages, and with the actual output voltage
that the value produces. For other output voltages, the resistor value can either be calculated using the following
formula, or simply selected from the range of values given in Table 2. Figure 18 shows the placement of the
required resistor.
The PTN78060A is a buck-boost switching regulator. In order that the output remains in regulation, the input
voltage must not exceed the output by a maximum differential voltage.
Another consideration is the pulse width modulation (PWM) range of the regulator's internal control circuit. For
stable operation, its operating duty cycle should not be lower than some minimum percentage. This defines the
maximum advisable ratio between the regulator's input and output voltage magnitudes.
For satisfactory performance, the maximum operating input voltage range must be equal to (32 – |VO|) volts.
As an example, Table 1 gives the operating input voltage range for the common output bus voltages. In addition,
the Electrical Characteristics define the available output voltage adjust range for various input voltages.
Table 1. Standard Values of Rset for Common Output
Voltages
VO
RSET
VO
Operating
(Required)
(Standard Value)
(Actual)
VI Range
–15 V
100
–14.997 V
9 V to 17 V
–12 V
2 k
–12.006 V
9 V to 20 V
–5 V
28.7 k
–5.000 V
9 V to 27 V
–3.3 V
221 k
–3.303 V
9 V to 28.7 V
(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 as close to the regulator as possible. Connect the resistor directly between pins 4 and 7
using dedicated PCB traces.
(2)
Never connect capacitors from VO Adjust to either GND or VO. Any capacitance added to the VO Adjust pin affects
the stability of the regulator.
Figure 18. VO Adjust Resistor Placement
8
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| PTN78060AAZT | 功能描述:DC/DC转换器 3A Wide-In Wide Neg Out Adj Module 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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