Texas Instruments TPS92311A19230VEVM Evaluation Module TPS92311A19230VEVM TPS92311A19230VEVM Datenbogen
Produktcode
TPS92311A19230VEVM
V
CC
V
SW
V
ZCD
V
ZCD-ARM
V
ZCD-OVP
V
LED
25.6V
13V
Steady
state
Low freq
state
Low freq
state
t
t
t
t
SNVS811B – MAY 2012 – REVISED MAY 2013
Figure 19. Output Short Circuit waveforms
OVER CURRENT PROTECTION
Over Current Protection (OCP) limits the drain current of internal MOSFET and prevents inductor / transformer
saturation. When V
saturation. When V
ISNS
reaches a threshold, the OCP is triggered and the internal MOSFET will turn off
immediately. The threshold is typically 3.4V and 0.64V when the TPS92311 is using an isolated topology and a
non-isolated topology respectively.
non-isolated topology respectively.
THERMAL PROTECTION
Thermal protection is implemented by an internal thermal shutdown circuit, which activates at 160°C (typically).
In this case, the internal switching power MOSFET will turn off. Capacitor C
In this case, the internal switching power MOSFET will turn off. Capacitor C
VCC
will discharge until UVLO. When
the junction temperature of the TPS92311 falls back below 130°C, the TPS92311 resumes normal operation.
Copyright © 2012–2013, Texas Instruments Incorporated
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