參數(shù)資料
型號： PTV08T250WAH
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
文件頁數(shù)： 13/30頁
文件大小： 795K
代理商： PTV08T250WAH
Hysterisis Adjust
k
)
H Y S
V
(1
0 .3 6 5
H Y S
V
2 6 .1
H Y S
R
-
=
(5)
Threshold Adjust
k
1
0.0027]
1)
/2.5
THD
0.014)(V
HYS
39.2[(1/R
39.2
THD
R
-
+
=
(6)
Calculated Values
SLTS260E – OCTOBER 2005 – REVISED NOVEMBER 2008 .......................................................................................................................................... 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: 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 5, and then be used to
determine a value for RTHD, using Equation 6.
Equation 6 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 6, may be assigned the value, 0.
Table 7 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 7. This is irrespective of whether the on-threshold voltage is being adjusted.
Table 7. 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
RHYS
71.5 k
107 k
165 k
287 k
649 k
N/A
8 V
30.1 k
43.2 k
63.4 k
97.6 k
169 k
402 k
8.5 V
25.5 k
36.5 k
51.1 k
73.2 k
110 k
187 k
9 V
23.2 k
30.9 k
42.2 k
57.6 k
82.5 k
124 k
9.5 V
20 k
27.4 k
36.5 k
48.7 k
64.9 k
90.9 k
10 V
RTHD
18.2 k
24.3 k
31.6 k
41.2 k
54.9 k
73.2 k
10.5 V
16.2 k
21.5 k
28 k
36.5 k
46.4 k
60.4 k
11 V
15 k
19.6 k
25.5 k
32.4 k
41.2 k
52.3 k
11.5 V
14 k
18.2 k
23.2 k
28 k
36.5 k
45.3 k
12 V
12.7 k
16.5 k
21 k
26.1 k
32.4 k
40.2 k
20
Copyright 2005–2008, Texas Instruments Incorporated
Product Folder Link(s): PTV08T250W
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