SI-8050JF Просмотр технического описания (PDF) - Allegro MicroSystems

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SI-8050JF

Step-Down to 5.0 V, 1.5 A, DC/DC Converter

Allegro MicroSystems 

SI-8050JF

Step-Down

to 5.0 V, 1.5 A,

DC/DC Converter

SwRitecghuinlagtors

APPLICATIONS INFORMATION (cont.)

Thermal Protection. Circuitry turns off the switching

transistor when the junction temperature rises above 150°C.

It is intended only to protect the device from failures due to

excessive junction temperatures and should not imply that

output short circuits or continuous overloads are permitted.

Heat Radiation and Reliability. The reliability of the

IC is directly related to the junction temperature (TJ) in its

operation. Accordingly, careful consideration should be

given to heat dissipation. The graph on page 2 illustrates

the effect of thermal resistance on the allowable package

power dissipation.

When mounting to a heat sink, apply silicone grease (Shin-

Etsu Chemical G746, Dow Corning Toray Silicone SC102,

or Toshiba Silicone SY6260). Recommended mounting

hardware torque: 0.588 ~ 0.686 Nm or 6.0 ~ 7.0 kgf•cm

(4.34 ~ 5.06 lbf•ft).

Layout Guideline

The junction temperature (TJ) can be determined from

either of the following equations:

TJ = (PDRθJA) + TA

or

TJ = (PDRθJC) + TC

where PD = VIII – VOIO – VFIO(1 – [VO/VI])

or the adjacent graph,

VF = the Schottky diode forward voltage, and

RθJC = 6°C/W.

115 Northeast Cutoff, Box 15036

6

Worcester, Massachusetts 01615-0036

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