Datasheet

V
CC
V
SW
V
ZCD
V
ZCD-ARM
V
ZCD-OVP
V
LED
25.6V
13V
Steady
state
Disconnect LED
Steady
state
I
LED
Reconnect LED
Force output short circuit
Steady
state
Startup
state
Low Freq state
Steady state
OV state
Startup
state
Steady
state
Low
Freq
state
Startup
state
Startup
state
TPS92310
SNVS792 –FEBRUARY 2012 www.ti.com
Over Current Protection
The Over Current Protection (OCP) limits the drain current of the external MOSFET Q1 and prevent inductor /
transformer saturation. When V
ISNS
reaches a threshold, the OCP is triggered and the output of the GATE pin is
low immediately. The threshold is typically 3.4V and 0.64V when the TPS92310 is using an isolated topology and
a non-isolated topology respectively.
Thermal Protection
Thermal protection is implemented by an internal thermal shutdown circuit, which activates at 160°C (typically) to
shut down the TPS92310. In this case, the GATE pin outputs low to turn off the external MOSFET, and hence no
power from the VAUX winding to V
CC
. Capacitor C
VCC
will discharge until UVLO. When the junction temperature
of the TPS92310 falls back below 130°C, the TPS92310 resumes normal operation.
Figure 20. Auto Restart Operation
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