Data Sheet No. PD-6.018D
IR2121
CURRENT LIMITING LOW SIDE DRIVER
Features
n
Gate drive supply range from 12 to 18V
n
Undervoltage lockout
n
Current detection and limiting loop to limit driven
power transistor current
n
Error lead indicates fault conditions and programs
shutdown time
n
Output in phase with input
Product Summary
V
OFFSET
I
O
+/-
V
OUT
V
CSth
t
on/off
(typ.)
5V max.
1A / 2A
12 - 18V
230 mV
150 & 150 ns
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.
The output driver features a high pulse current buffer
stage designed for minimum cross-conduction. The
protection circuitry detects over-current in the driven
power transistor and limits the gate drive voltage.
Cycle-by-cycle shutdown is programmed by an ex-
ternal capacitor which directly controls the time in-
terval between detection of the over-current limiting
condition and latched shutdown. The output can be
used to drive an N-channel power MOSFET or IGBT
in the low side configuration.
Package
Typical Connection
TO
LOAD
V
CC
IN
V
CC
IN
ERR
COM
V
CC
OUT
CS
V
S
C
ONTROL
I
NTEGRATED
C
IRCUIT
D
ESIGNERS
M
ANUAL
B-91
IRF [ INTERNATIONAL RECTIFIER ]
