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参数资料
| 型号： | PTN78020HAZT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, DIP-7 |
| 文件页数： | 2/26页 |
| 文件大小： | 669K |
| 代理商： | PTN78020HAZT |
APPLICATION INFORMATION
Adjusting the Output Voltage of the PTN78020x Series of Wide-Output Adjust Power Modules
General
R
=54.9k
SET
W
1.25 V
V
-V
O
min
-R
P
(1)
Input Voltage Considerations
SLTS228B – DECEMBER 2004 – REVISED APRIL 2008 .................................................................................................................................................. www.ti.com
A resistor must be connected between the VO Adjust control (pin 4) and GND (pin 7) to set the output voltage.
The adjustment range is from 2.5 V to 12.6 V for PTN78020W. The adjustment range is from 11.85 V to 22 V for
PTN78020H. 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 a number of standard voltages, with the actual
output voltage that the value provides. For other output voltages, the value of the required resistor can either be
calculated using Equation 1 and the constants for the applicable product in Table 1. Figure 24 shows the
placement of the required resistor.
Table 1. RSET Formula Constants
PRODUCT
VMIN
RP
PTN780x0W
2.5 V
6.49 k
PTN780x0H
11.824 V
6.65 k
The PTN78020 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.
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 PTN78020x must adhere to
the following requirements.
1. For PTN78020W output voltages lower than 10 V, the minimum input voltage is (VO + 2 V ) or 7 V, whichever
is higher.
2. For PTN78020W output voltages equal to 10 V and higher, the minimum input voltage is (VO + 2.5 V ) .
3. For PTN78020W, the maximum input voltage is (10
× V
O ) or 36 V, whichever is less.
4. For PTN78020H output voltages lower than 19 V, the minimum input voltage is (VO + 3 V ) or 15 V,
whichever is higher.
5. For PTN78020H output voltages equal to 19 V and higher, the minimum input voltage is (VO + 4 V ) .
Table 2 gives the operating input voltage range for the common output bus voltages. In addition, the Electrical
Characteristics table defines the available output voltage adjust range for various input voltages.
Table 2. Standard Values of Rset for Common Output Voltages
VO
RSET
VO
Operating
PRODUCT
(Required)
(Standard Value)
(Actual)
VI Range
2.5 V
Open
2.5 V
7 V to 25 V
3.3 V
78.7 k
3.306 V
7 V to 33 V
PTN780x0W
5 V
21 k
4.996 V
7 V to 36 V
12 V
732
12.002 V
14.5 V to 36 V
12 V
383 k
12.000 V
15 V to 36 V
15 V
15 k
14.994 V
18 V to 36 V
PTN780x0H
18 V
4.42 k
18.023 V
21 V to 36 V
22 V
95.3
21.998 V
26 V to 36 V
10
Copyright 2004–2008, Texas Instruments Incorporated
Product Folder Link(s): PTN78020W PTN78020H
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PTN78020W | 制造商:TI 制造商全称:Texas Instruments 功能描述:6-A, WIDE-INPUT ADJUSTABLE SWITCHING REGULATOR |
| PTN78020W_08 | 制造商:TI 制造商全称:Texas Instruments 功能描述:6-A, WIDE-INPUT ADJUSTABLE SWITCHING REGULATOR |
| PTN78020WAD | 功能描述:DC/DC转换器 6-A Wide-Input Vltg Adj Swtch Regulator 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: |
| PTN78020WAH | 功能描述:DC/DC转换器 6-A Wide-Input Vltg Adj Swtch Regulator 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: |
| PTN78020WAH | 制造商:Texas Instruments 功能描述:IC SWITCHING REG 6A ADJ 8020 制造商:Texas Instruments 功能描述:IC, SWITCHING REG 6A ADJ, 8020 制造商:Texas Instruments 功能描述:IC, SWITCHING REG 6A ADJ, 8020; Primary Input Voltage:36V; No. of Outputs:1; Output Current:6A; Voltage Regulator Case Style:SIP Module; No. of Pins:7; Operating Temperature Min:-40C; Operating Temperature Max:85C; SVHC:No SVHC ;RoHS Compliant: Yes |
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