データシートサーチシステム |
|
LM2432 データシート(PDF) 8 Page - Texas Instruments |
|
LM2432 データシート(HTML) 8 Page - Texas Instruments |
8 / 17 page OBSOLETE LM2432 SNOSAL4E – MARCH 2005 – REVISED APRIL 2013 www.ti.com Figure 13. Recommended Application Circuit EFFECT OF LOAD CAPACITANCE Figure 7 shows the effect of increased load capacitance on the speed of the device. The rise and fall time increase by 7% and 7.5%, respectively, per additional pF above 10 pF. EFFECT OF OFFSET Figure 8 shows the variation in rise and fall times when the DC offset of the 110VPP output swing is varied between 120V and 150VDC. The rise time shows a variation of less than 10% relative to the center data point (135VDC). The fall time shows a variation of 14% relative to the center data point. THERMAL CONSIDERATIONS Figure 9 shows the performance of the LM2432 as a function of case temperature. The figure shows that the rise and fall times of the LM2432 increase by approximately 17% and 20%, respectively, as the case temperature increases from 40°C to 90°C. This corresponds to a speed degradation of only 3.5% and 4.0% for every 10°C rise in case temperature. POWER DISSIPATION AND HEATSINK CALCULATION Worst-Case Power Dissipation Figure 10 shows the maximum power dissipation of the LM2432 vs. square wave frequency when the device uses VCC of 220V and is driving a 10 pF load with 110VPP swing alternating one pixel on, one pixel off signal. Note that the frequency range shown in the power dissipation figure is one-half the actual pixel frequency. The graph assumes 80% active time (device operating at the specified frequency), which is typical in a HDTV application. The other 20% of the time the device is assumed to be sitting at the black level (190V in this case). Under these worst-case condition, the maximum power dissipated by the LM2432 is about 8.9W at around 30 MHz. It is important to note that this power dissipation is a result of a high frequency square wave input, which is unrealistic in practical TV applications. The bandwidth of the input source used to drive the LM2432 was over 300 MHz. Using a RGB video processor or preamplifier with less bandwidth may cause the LM2432 to dissipate less power than shown in Figure 10 at the same conditions. A Practical Approach to Power Dissipation The power curve (Figure 10) mentioned previously shows the LM2432 power dissipation for square wave frequencies ranging from 1 to 50 MHz at 110VPP swing. In practice, it is unrealistic for a TV to display average frequency content over the entire picture exceeding 20 MHz. Therefore, it is important to establish the worst-case picture condition under normal viewing to give a realistic maximum power dissipation for the LM2432. Here is one approach: 8 Submit Documentation Feedback Copyright © 2005–2013, Texas Instruments Incorporated Product Folder Links: LM2432 |
同様の部品番号 - LM2432 |
|
同様の説明 - LM2432 |
|
|
リンク URL |
プライバシーポリシー |
ALLDATASHEET.JP |
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 | 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 |