TDA9556 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

TDA9556

7.5 NS TRIPLE-CHANNEL HIGH VOLTAGE VIDEO AMPLIFIER

STMicroelectronics 

TDA9556

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 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 (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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