M5481 データシートの表示（PDF） - STMicroelectronics

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M5481

LED DISPLAY DRIVER

STMicroelectronics 

TYPICAL APPLICATION

Figure 6. BASIC electronically tuned TV system

LED DISPLAY

14 SEGMENTS

M5481

DISPLAY DRIVER

KEYBOARD

PROCESSOR

PLL

SYNTHESIZER

M5481

POWER DISSIPATION OF THE IC

The power dissipation of the IC can be limited us-

ing different configurations.

Figure 7.

In this application R must be chosen taking into ac-

count the worst operating conditions.

R is determined by the maximum number of seg-

ments activated.

+VC

R

ID

VD

VOUT

R = -V----C------–----V----D-----M------A----X-----–-----V----O-----M------I--N---

NMAXLD

The worst case condition for the device is when

roughly half of the maximum number of segments

are activated.

It must be checked that the total power dissipation

does not exceed the absolute maximum ratings of

the device.

In critical cases more resistors can be used in con-

junction with groups of segments.In this case the

current variation in the single resistor is reduced

and Ptot limited.

5/10

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