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Data Sheet No. PD60018-M
IR2121 & (PbF)
CURRENT LIMITING LOW SIDE DRIVER
Features
? Gate drive supply range from 12 to 18V
? Undervoltage lockout
? Current detection and limiting loop to limit driven
power transistor current
? Error lead indicates fault conditions and programs
shutdown time
? Output in phase with input
? 2.5V, 5V and 15V input logic compatible
? Also available LEAD-FREE
Description
The IR2121 is a high speed power MOSFET and
IGBT driver with over-current limiting protection cir-
cuitry. Latch immune CMOS technology enables rug-
gedized monolithic construction. Logic inputs are
compatible with standard CMOS or LSTTL outputs,
down to 2.5V logic.
The output driver features a
high pulse current buffer stage designed for mini-
mum cross-conduction. The protection circuitry de-
tects over-current in the driven power transistor and
Product Summary
V OFFSET
I O +/-
V OUT
V CSth
t on/off (typ.)
Package
5V max.
1A / 2A
12 - 18V
230 mV
150 & 150 ns
limits the gate drive voltage. Cycle-by-cycle shut-
down is programmed by an external capacitor which
8-Lead PDIP
directly controls the time interval between detection of the over-current limiting condition and latched shut-
down. The output can be used to drive an N-channel power MOSFET or IGBT in the low side configuration.
Typical Connection
TO
LOAD
V CC
IN
(Refer to Lead
Assignments for correct
pin configuration). This/
These diagram(s) show
electrical connections
only. Please refer to our
Application Notes and
DesignTips for proper
circuit board layout.
www.irf.com
V CC
IN
ERR
COM
V CC
OUT
CS
V S
1
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