參數(shù)資料
型號(hào)： PTH12040WAH
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源模塊
英文描述： 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
封裝： DIP-20
文件頁(yè)數(shù)： 6/27頁(yè)
文件大?。?/td> 633K
代理商： PTH12040WAH
Hysterisis Adjust
R
HYS +
26.1
H
HYS
0.365
1 * VHYS
kW
(2)
Threshold Adjust
R
THD +
39.2 kW
39.2 (1 R
HYS )
0.014 V
THD
2.5 * 1 * 0.0027 *1
(3)
Calculated Values
SLTS237G – DECEMBER 2004 – REVISED MARCH 2009............................................................................................................................................... www.ti.com
The hysterisis voltage, VHYS, is the difference between the on and off threshold values. The default value is 1 V
and it can only be adjusted to a lower value.
Caution should be used when changing the hysterisis voltage to a lower value, as it could induce
start-up oscillations.
Any change in the hysterisis voltage requires both RHYS and RTHD resistors be in place. Adding RHYS alone does
not have the desired effect. The value for RHYS must first be calculated using Equation 2. The value identified for
RHYS must then be used to determine a value for RTHD, using Equation 3.
Equation 3 determines the value of RTHD required to adjust VTHD to a new value. The default value is 7.5 V, and it
may only be adjusted to a higher value. If the hysterisis value has been adjusted, then a value for RTHD must also
be calculated. (This is irrespective of whether VTHD is being adjusted.) If there has been no adjustment for the
hystersis voltage, the term 1/RHYS in Equation 3, may be assigned the value, 0.
Table 4 shows a matrix of standard resistor values for RHYS and RTHD, for different options of the on-threshold
(VTHD) and hysterisis (VHYS) voltages. For most applications, only the on-threshold voltage should need to be
adjusted. In this case select only a value for RTHD from far right-hand column.
The hysterisis should only be adjusted if there is a specific requirement to independently adjust the off-threshold,
separately from the on-threshold voltage. In this case, a value for both RHYS and RTHD must be selected from
Table 4. This is irrespective of whether the on-threshold voltage is being adjusted.
Table 4. Calculated Values of RHYS and RTHD, for Various Values of VHYS and
VTHD
1 V
VHYS
0.5 V
0.6 V
0.7 V
0.8 V
0.9 V
(default)
VTHD (V)
RHYS ( k)
71.5
107
165
287
649.0
N/A
8.0
30.1
43.2
63.4
97.6
169 .0
402.0
8.5
25.5
36.5
51.1
73.2
110.0
187.0
9.0
23.2
30.9
42.2
57.6
82.5
124.0
9.5
20.0
27.4
36.5
48.7
64.9
90.9
10.0
RTHD ( k)
18.2
24.3
31.6
41.2
54.9
73.2
10.5
16.2
21.5
28.0
36.5
46.4
60.4
11.0
15.0
19.6
25.5
32.4
41.2
52.3
11.5
14.0
18.2
23.2
28.0
36.5
45.3
12.0
12.7
16.5
21.0
26.1
32.4
40.2
14
Copyright 2004–2009, Texas Instruments Incorporated
Product Folder Link(s): PTH12040W
相關(guān)PDF資料
PDF描述
PTH12040WAZ 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
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PTH12040WAHT 制造商:ARTESYN 制造商全稱:Artesyn Technologies 功能描述:DC-DC CONVERTERS POLA Non-isolated
PTH12040WAS 功能描述:DC/DC轉(zhuǎn)換器 50-A 8-14V-Inp Wide Out Adj Pwr Module RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)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(fēng)格:SMD/SMT 封裝 / 箱體尺寸:
PTH12040WAST 功能描述:DC/DC轉(zhuǎn)換器 50A,8-14Vin,Wide- Out Adj Pwr Mod RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)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(fēng)格:SMD/SMT 封裝 / 箱體尺寸:
PTH12040WAZ 功能描述:DC/DC轉(zhuǎn)換器 8.0-14Vin 5.5V 50A 2.045" x1.045"x0.357 RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)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(fēng)格:SMD/SMT 封裝 / 箱體尺寸:
PTH12040WAZT 功能描述:DC/DC轉(zhuǎn)換器 8.0-14Vin 5.5V 50A 2.045" x1.045"x0.357 RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)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(fēng)格:SMD/SMT 封裝 / 箱體尺寸:
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