 |
データシートサーチシステム |
|
|
データシートサーチシステム |
|
PTV08040WAD データシート(PDF) 13 Page - Texas Instruments |
|
|
|
|||||||||||||||||||||||||||||
PTV08040WAD データシート(HTML) 13 Page - Texas Instruments |
|
|
13 / 23 page  www.ti.com Hysterisis Adjust k ) H Y S V (1 0 .3 6 5 H Y S V 2 6 .1 H Y S R - ´ ´ = (2) Threshold Adjust k 1 0.0027] 1) /2.5 THD 0.014)(V HYS 39.2[(1/R 39.2 THD R - - - + = (3) Calculated Values PTV08040W SLTS257A – SEPTEMBER 2005 – REVISED JANUARY 2007 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 permit 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, and 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 RHYS 71.5 k Ω 107 k Ω 165 k Ω 287 k Ω 649 k Ω N/A 8 V 30.1 k Ω 43.2 k Ω 63.4 k Ω 97.6 k Ω 169 k Ω 402 k Ω 8.5 V 25.5 k Ω 36.5 k Ω 51.1 k Ω 73.2 k Ω 110 k Ω 187 k Ω 9 V 23.2 k Ω 30.9 k Ω 42.2 k Ω 57.6 k Ω 82.5 k Ω 124 k Ω 9.5 V 20 k Ω 27.4 k Ω 36.5 k Ω 48.7 k Ω 64.9 k Ω 90.9 k Ω 10 V RTHD 18.2 k Ω 24.3 k Ω 31.6 k Ω 41.2 k Ω 54.9 k Ω 73.2 k Ω 10.5 V 16.2 k Ω 21.5 k Ω 28 k Ω 36.5 k Ω 46.4 k Ω 60.4 k Ω 11 V 15 k Ω 19.6 k Ω 25.5 k Ω 32.4 k Ω 41.2 k Ω 52.3 k Ω 11.5 V 14 k Ω 18.2 k Ω 23.2 k Ω 28 k Ω 36.5 k Ω 45.3 k Ω 12 V 12.7 k Ω 16.5 k Ω 21 k Ω 26.1 k Ω 32.4 k Ω 40.2 k Ω 13 Submit Documentation Feedback |
|
|
リンク URL |
| ALLDATASHEETはお客様のビジネスに役立ちますか？ [ DONATE ] |
Alldatasheetは | 広告 | お問い合わせ | プライバシーポリシー | データシートへのリンク | リンク交換 | メーカーリスト All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Japanese ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
