Datasheet

SW
LM3402
GND
CS
8V
V
TRANSIENT
~ 0.675
Module
Connector
Module
Connector
50051 k5
SW
LM3402
GND
CS
8V
V
TRANSIENT
~ 0.675
Module
Connector
Module
Connector
1 k5
LM3402, LM3402HV
SNVS450E –SEPTEMBER 2006–REVISED MAY 2013 www.ti.com
CS PIN PROTECTION WITH OVP
When designing output overvoltage protection into the switching converter circuit using a zener diode, transient
protection on the CS pin requires additional consideration. As shown in Figure 26, adding a zener diode from the
output to the CS pin (with the series resistor) for output overvoltage protection will now again allow the transient
energy to be passed through the CS pin’s ESD structure thereby damaging it.
Adding an additional series resistor to the CS pin as shown in Figure 27 will result in the majority of the transient
energy to pass through the sense resistor thereby protecting the LM340X device.
Figure 26. CS Pin with OVP, Transient Path
Figure 27. CS Pin with OVP, Transient Path with Protection
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