Isolated, Precision
Half-Bridge Driver, 4 A Output
Data Sheet
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FEATURES
Isolated high-side and low-side outputs
Working voltage
High side or low side relative to input: ±350 V peak
High side/low side differential: 350 V peak
4 A peak output current
High frequency operation: 1 MHz maximum
High common-mode transient immunity: >25 kV/µs
High temperature operation: 105°C
Narrow body, 16-lead SOIC
Safety and regulatory approvals
UL recognition
1000 V rms for 1 minute per UL 1577
APPLICATIONS
Isolated IGBT/MOSFET gate drives
Plasma displays
Industrial inverters
Switching power supplies
GENERAL DESCRIPTION
The ADuM7234
1
is an isolated, half-bridge gate driver that
uses the Analog Devices, Inc., iCoupler® technology to provide
independent and isolated high-side and low-side outputs.
Combining high speed CMOS and monolithic transformer
technology, this isolation component provides outstanding
performance characteristics superior to optocoupler-based
solutions.
By avoiding the use of LEDs and photodiodes, this iCoupler gate
drive device is able to provide precision timing characteristics
not possible with optocouplers. Furthermore, the reliability and
performance stability problems associated with optocoupler
LEDs are avoided.
In comparison to gate drivers that use high voltage level
translation methodologies, the ADuM7234 offers the benefit
of true, galvanic isolation between the input and each output
and between each input. Each output can be operated at up to
±350 V peak relative to the input, thereby supporting low-side
switching to negative voltages. The differential voltage between
the high side and low side can be as high as 350 V peak.
As a result, the ADuM7234 provides reliable control over the
switching characteristics of IGBT/MOSFET configurations over
a wide range of positive or negative switching voltages.
FUNCTIONAL BLOCK DIAGRAM
ENCODE DECODE
ENCODE DECODE
DISABLE
NC
NC
ADuM7234
V
DD1
NC
V
DDB
V
OB
GND
B
5
6
7
8
12
11
GND
1
NC
4 13
V
DD1
GND
A
3 14
V
IB
V
OA
2 15
V
IA
V
DDA
1
16
10
9
07990-001
Figure 1.
1
Protected by U.S. Patents 5,952,849 and 6,291,907.
