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EM8564A Arkusz danych(PDF) 11 Page - Excelliance MOS Corp.

Numer części EM8564A
Szczegółowy opis  HV Start-up Green-mode PWM Convertor with Brown-Out Protection
PDF  12 Pages
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Producent  EXCELLIANCE [Excelliance MOS Corp.]
Strona internetowa  http://www.excelliancemos.com/
Logo EXCELLIANCE - Excelliance MOS Corp.

EM8564A Arkusz danych(HTML) 11 Page - Excelliance MOS Corp.

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2013/05/16
A.1
11
EM8564A
Protection
The EM8564A provides many protection functions
that intend to protect system from being damaged.
All the protection functions are listed as below:
Cycle-by-cycle current limit
The EM8564A has over-current
protection
thresholds. It is for cycle-by-cycle current limit,
which turns off MOSFET for the remainder of
the switching cycle when the sensing voltage of
MOSFET current reaches the threshold.
Over-load / Open-loop Protection (OLP)
When feedback loop is open, as shown in Fig. 18,
no current flows through the opto-coupler
transistor, the EM8564A pulls up the COMP pin
voltage to 5.2V.
When the COMP pin voltage is above 4.0V
longer than 56mS, OLP is triggered. This
protection is also triggered when the SMPS
output drops below the normal value longer
than 56mS due to the overload condition.
Fig. 18
Over Voltage Protection (OVP) on VCC
The
EM8564A
are
implemented
an
Over-Voltage-Protection
(OVP)
on
VCC.
Whenever the VCC voltage is high than the OVP
threshold voltage (29V), the output gate drive
will be shutdown to stop the switching of the
power MOSFET until the next UVLO (on).
The Over-Voltage-Protection on VCC function in
EM8564A is an auto-restart type protection. If
the OVP condition is not released, the VCC will
tripped the OVP level again and re-shutdown
the gate output. The VCC is working as a hiccup
mode as shown in Fig. 19. On the other hand, if
the OVP condition is removed, the VCC level will
go back to normal level and the output will
automatically return to the normal operation.
Fig. 19
Internal Over-Temperature Protection (OTP)
Internal 150
℃ comparator will provide over
temperature protection (OTP). OTP will not
shutdown system. It stops the system from
switching until the VCC is below the UVLO (off)
threshold voltage, the system will hiccup.
Gate out
VCC
t
t
UVLO(on)
UVLO(off)
OVP level
No Switch out



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