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參數(shù)資料
| 型號(hào)： | TDA9556 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3 CHANNEL, VIDEO AMPLIFIER, PZIP11 |
| 封裝： | PLASTIC, CLIPWATT-11 |
| 文件頁(yè)數(shù)： | 22/22頁(yè) |
| 文件大小： | 315K |
| 代理商： | TDA9556 |
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TDA9556
9/22
7
POWER DISSIPATION
The total power dissipation is the sum of the static DC and the dynamic dissipation:
PTOT =PSTAT +PDYN.
The static DC power dissipation is approximately:
PSTAT =VDD xIDD +VCC xICC
The dynamic dissipation is, in the worst case (1 pixel On/ 1 pixel Off pattern):
PDYN =3 VDD xCL xVOUT(PP) x f x K (see Note 6)
where f is the video frequency and K the ratio between the active line and the total horizontal line duration.
Example:
for VDD = 110V, VCC = 12V,
IDD = 25mA, ICC = 60mA,
VOUT =40 VPP, f = 40MHz,
CL = 8pF and K = 0.72.
We have:
PSTAT = 3.47W and PDYN = 3.04W
Therefore:
PTOT = 6.51W.
Note 6: This worst thermal case must only be considered for TJmax calculation. Nevertheless, during the average life
of the circuit, the conditions are closer to the white picture conditions.
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