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TPS2400DBVRG4 Datasheet(PDF) 11 Page - Texas Instruments

No. de pieza TPS2400DBVRG4
Descripción Electrónicos  Overvoltage Protection Controller
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TPS2400DBVRG4 Datasheet(HTML) 11 Page - Texas Instruments

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VS
LS
RS
F1
Appliance
Power Supply
+
TVS
LOAD
F2
S1
VIN
IIN
IOUT
VOUT
TPS2400
FDC3616N
5
4
2
VIN
GATE
GND
TPS2400
www.ti.com
SLUS599B – JUNE 2004 – REVISED OCTOBER 2015
Feature Description (continued)
Figure 13. Application Diagram
8.4 Device Functional Modes
8.4.1 Overvoltage Protection
An overvoltage condition is commonly created in these situations:
Unplugging a wall adapter from an AC outlet. Energy stored in the transformer magnetizing inductance is
released and spikes the output voltage.
Powering an appliance with the wrong voltage adapter (user error).
Automotive load dump due to ignition, power windows, or starter motor (for example).
An AC power-line transient.
Power switch contact bounce (causes power supply/distribution inductive kick), (See Figure 14).
Many electronic appliances use a transient voltage suppressor (TVS) for overvoltage protection as shown in
Figure 14. The TVS is typically a metal-oxide varister (MOV) or Transzorb. The former is a nonlinear resistor with
a soft turnon characteristic whereas the latter is a large junction Zener diode with a very sharp turnon
characteristic. These devices have high pulse-power capability and pico-second response time. A TVS clamps
the load voltage to a safe level so the load operates uninterrupted in the presence of power supply output-
voltage spikes. But in the event of a voltage surge, fuse F2 blows and must be replaced to restore operation.
Figure 14. Load Protection Using Transient Voltage Suppressor Clamps
The TPS2400 circuit in Figure 15 protects the load from an overvoltage, not by clamping the load voltage like a
TVS, but by disconnecting the load from the power supply. The circuit responds to an overvoltage in less than 1
µs and rides out a voltage surge without blowing fuse F2. The voltage surge can be of indefinite duration.
The load can see a voltage spike of up to 1 µs, the amount of time it takes the TPS2400 to disconnect the load
from the power supply. A low-power Zener diode D2 can be used to clamp the load voltage to a safe level. In
most cases, diode D2 is not necessary because the load bypass capacitor (not shown) forms a low-pass filter
with resistor RS and inductor LS to significantly attenuate the spike.
Copyright © 2004–2015, Texas Instruments Incorporated
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