TPS2400_15 Datasheet, PDF (10/24 Pages) Texas Instruments – Overvoltage Protection Controller

TPS2400
SLUS599B – JUNE 2004 – REVISED OCTOBER 2015
8 Detailed Description
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8.1 Overview
The TPS2400 device is used in applications that must protect the load from overvoltage event. Benefits include
fast response time and survival during extended overvoltage events.
8.2 Functional Block Diagram
VIN
5
GND 2
8V
1.15 V
High= Closed
Internal Rail
UVLO
+
Enable
OVLO
+
8V
Charge Pump
18 V
5 µA
4 GATE
8.3 Feature Description
8.3.1 Undervoltage and Overvoltage Comparators and Logic
When the comparators detect that VCC is within the operating window, the GATE output is driven high to turn on
the external N-channel MOSFET. When V_CC goes above the set overvoltage level, or below the set undervoltage
level, the GATE output is driven low.
8.3.2 Charge Pump
An internal charge pump supplies power to the GATE drive circuit and provides the necessary voltage to pull the
gate of the MOSFET above the source.
8.3.3 Zener Diodes
Limit internal power rails to 8 V and GATE output to 18 V.
8.3.4 Shut-Off MOSFET
When an undervoltage or overvoltage event occurs, this MOSFET is turned on to pulldown the gate of the
external N-channel MOSFET, thus isolating the load from the incoming transient.
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