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參數資料
| 型號： | PTN78000WAST |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3.2 A SWITCHING REGULATOR, 660 kHz SWITCHING FREQ-MAX, DMA5 |
| 文件頁數： | 2/26頁 |
| 文件大?。?/td> | 634K |
| 代理商： | PTN78000WAST |
APPLICATION INFORMATION
Adjusting the Output Voltage of the PTN78000 Wide-Output Adjust Power Modules
General
R
=54.9k
SET
W
1.25 V
V -V
O
min
-R
P
(1)
Input Voltage Considerations
SLTS230C – NOVEMBER 2004 – REVISED SEPTEMBER 2008...................................................................................................................................... www.ti.com
A resistor must be connected between the VO Adjust control (pin 4) and GND (pin 1) to set the output voltage.
The adjustment range is from 2.5 V to 12.6 V for PTN78000W. The adjustment range is from 11.85 V to 22 V for
PTN78000H. If pin 4 is left open, the output voltage defaults to the lowest value.
Table 2 gives the preferred value of the external resistor for several standard voltages, with the actual output
voltage that the value provides. For other output voltages, the value of the required resistor can be calculated
using Equation 1, and the constants for the applicable product in Table 1. Alternatilvey, RSET can be simply
selected from the range of values given in Table 3. Figure 27 shows the placement of the required resistor.
Table 1. RSET Formula Constants
PRODUCT
VMIN (V)
RP (k)
PTN780x0W
2.5
6.49
PTN780x0H
11.824
6.65
The PTN78000 is a step-down switching regulator. In order that the output remains in regulation, the input
voltage must exceed the output by a minimum differential voltage. (Please refer to the input voltage range
requirements in the electrical characteristics table.)
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 input and output voltage magnitudes.
As an example, for satisfactory performance, the operating input voltage range of the PTN78000x must adhere to
the following requirements.
1. For PTN78000W output voltages lower than 10 V, the minimum input voltage is (VO + 2 V ) or 7 V, whichever
is higher.
2. For PTN78000W output voltages equal to 10 V and higher, the minimum input voltage is (VO + 2.5 V ) .
3. For PTN78000W, the maximum input voltage is (10 x VO ) or 36 V, whichever is less.
4. For PTN78000H output voltages lower than 19 V, the minimum input voltage is (VO + 3 V ) or 15 V,
whichever is higher.
5. For PTN78000H output voltages equal to 19 V and higher, the minimum input voltage is (VO + 4 V ) .
10
Copyright 2004–2008, Texas Instruments Incorporated
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| PTN78000WAZ | 功能描述:DC/DC轉換器 ADJ SWITCHING REGULATOR RoHS:否 制造商:Murata 產品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| PTN78000WAZT | 功能描述:DC/DC轉換器 ADJ SWITCHING REGULATOR RoHS:否 制造商:Murata 產品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| PTN78020A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:25-W, WIDE-INPUT ADJUSTABLE POSITIVE-TO-NEGATIVE VOLTAGE REGULATOR MODULE |
| PTN78020AAH | 功能描述:DC/DC轉換器 4A Wide Inp/Neg Out Adj Module RoHS:否 制造商:Murata 產品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| PTN78020AAS | 功能描述:DC/DC轉換器 4A Wide Inp/Neg Out Adj Module RoHS:否 制造商:Murata 產品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
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