APW7098
Function Description (Cont.)
Over-Temperature Protection (OTP)
When the junction temperature increases above the ris-
ing threshold temperature TOTR, the IC will enter the over-
temperature protection state that suspends the PWM,
which forces the LGATE and UGATE gate drivers to out-
put low voltages and turns off the 5VCC linear regulator
output. The thermal sensor allows the converters to start
a start-up process and regulate the output voltage again
after the junction temperature cools by 50oC. The OTP is
designed with a 50oC hysteresis to lower the average TJ
during continuous thermal overload conditions, which
increases lifetime of the APW7098.
Copyright ã ANPEC Electronics Corp.
20
www.anpec.com.tw
Rev. A.6 - Oct., 2009
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
