ADP1032ACPZ-4-R7 datasheet(34/37 Pages) AD

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ADP1032

Data Sheet

Rev. 0 | Page 34 of 37

In this case, the ac rms voltage is simply the line voltage of

240 V rms. This calculation is more relevant when the waveform is

not sinusoidal. The value is compared to the limits for working

voltage in Table 9 for the expected lifetime, which is less than a

60 Hz sine wave, and it is well within the limit for a 20-year

service life.

The dc working voltage limit is set by the creepage of the

package as specified in IEC 60664-1. This value can differ for

specific system level standards.

THERMAL ANALYSIS

For the purpose of thermal analysis, the ADP1032 die are

treated as a thermal unit, with the highest junction temperature

reflected in the θJA values from Table 8. The value of θJA is based

on measurements taken with the devices mounted on a JEDEC

standard, 4-layer board with fine width traces and still air. Under

normal operating conditions, the ADP1032 operates at a full

load across the full temperature range without derating the output

current. However, following the recommendations in the PCB

Layout Considerations section decreases thermal resistance to

the PCB, allowing increased thermal margins in high ambient

temperatures. Each switching regulator in the ADP1032 has a

thermal shutdown circuit that turns off the dc-to-dc converter

and the outputs when a die temperature of approximately 150°C is

reached. When the die cools below approximately 135°C, the

ADP1032 dc-to-dc converter outputs turn on again.

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