ADUM7234 Datasheet, PDF (1/12 Pages) Analog Devices – Isolated Precision Half-Bridge Driver, 4 A Output

Isolated Precision Half-Bridge Driver,
4 A Output
ADuM7234
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 (pending)
UL recognition
UL 1577 1000 V rms input-to-output withstand voltage
APPLICATIONS
Isolated IGBT/MOSFET gate drives
Plasma displays
Industrial inverters
Switching power supplies
GENERAL DESCRIPTION
The ADuM7234¹ is an isolated, half-bridge gate driver that
employs 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 employing 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 may be operated 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 may 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
NC 1
V_IA 2
V_IB 3
V_DD1 4
GND₁ 5
ADuM7234
ENCODE
DECODE
16 V_DDA
15 V_OA
14 GND_A
13 NC
12 NC
DISABLE 6
V_DD1 7
NC 8
ENCODE
DECODE
Figure 1.
11 V_DDB
10 V_OB
9 GND_B
1 _{Protected by U.S. Patents 5,952,849 and 6,291,907.}
Rev. A
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