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参数资料
| 型号： | PTN78000AAST |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 9 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | DIP-5 |
| 文件页数： | 18/19页 |
| 文件大小： | 492K |
| 代理商： | PTN78000AAST |
www.ti.com
APPLICATION INFORMATION
Adjusting the Output Voltage of the PTN78000A Wide-Output Adjust Power Modules
General
R
= 54.9 k
SET
W
1.25 V
||
V -3V
O
- 5.62 kW
Input Voltage Considerations
GND
V
O
PTN78000A
1
5
2
Adj
GND
V
O
VI
GND
4
+
C1
C2
RSET
0.05 W
1%
C3
PTN78000A
SLTS246B–APRIL 2005–REVISED JANUARY 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 17 shows the placement of the
required resistor.
The PTN78000A 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.
For satisfactory performance, the maximum operating input voltage is (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 Ω
–14.997 V
9 V to 17 V
–12 V
2 kΩ
–12.006 V
9 V to 20 V
–5 V
28.7 kΩ
–5.000 V
9 V to 27 V
–3.3 V
221 kΩ
–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 1
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 17. VO Adjust Resistor Placement
8
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相关代理商/技术参数 |
参数描述 |
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| PTN78000AAZ | 功能描述:DC/DC转换器 1.5A Wide Inp/ 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: |
| PTN78000AAZT | 功能描述:DC/DC转换器 1.5A Wide Inp/ 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: |
| PTN78000H | 制造商:TI 制造商全称:Texas Instruments 功能描述:1.5-A, WIDE-INPUT ADJUSTABLE SWITCHING REGULATOR |
| PTN78000HAH | 功能描述:DC/DC转换器 1.5 A Wide I/O 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: |
| PTN78000HAH | 制造商:Texas Instruments 功能描述:DC/DC Converter (DC-DC) / Switching Regu |
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