TDA9535L 查看數據表（PDF） - STMicroelectronics

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TDA9535L

9.5 NS TRIPLE-CHANNEL HIGH VOLTAGE VIDEO AMPLIFIER WITH VERY LOW STD-BY POWER CONSUMPTION

STMicroelectronics 

TDA9535L

9 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 x IDD + VCC x ICC

The dynamic dissipation is, in the worst case (1

pixel On/ 1 pixel Off pattern):

PDYN = 3 VDD x CL x VOUT(PP) x f x K

where f is the video frequency and K the ratio be-

tween the active line and the total horizontal line

duration.

Example:

for VDD = 110V, VCC = 12V,

IDD =15mA, ICC = 40mA,

VOUT = 40 VPP, f = 40MHz,

CL = 8pF and K = 0.72.

We have:

PSTAT = 2.13W, PDYN = 3.04W

Therefore:

PTOT = 4.41W.

Note 4:

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.

9/16

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