ADUM1234 Datasheet, PDF (1/12 Pages) Analog Devices – Isolated, Precision Half-Bridge Driver, 0.1 A Output

Isolated, Precision
Half-Bridge Driver, 0.1 A Output
ADuM1234
FEATURES
Isolated high-side and low-side outputs
High side or low side relative to input: ±700 VPEAK
High-side/low-side differential: 700 VPEAK
0.1 A peak output current
CMOS input threshold levels
High frequency operation: 5 MHz maximum
High common-mode transient immunity: >75 kV/μs
High temperature operation: 105°C
Wide body, RoHS compliant, 16-lead SOIC
UL1577 2500 V rms input-to-output withstand voltage
APPLICATIONS
Isolated IGBT/MOSFET gate drives
Plasma displays
Industrial inverters
Switching power supplies
GENERAL DESCRIPTION
The ADuM1234¹ 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 ADuM1234 offers the benefit
of true, galvanic isolation between the input and each output.
Each output can be operated up to ±700 VPEAK 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 700 VPEAK.
As a result, the ADuM1234 provides reliable control over the
switching characteristics of IGBT/MOSFET configurations over
a wide range of positive or negative switching voltages.
FUNCTIONAL BLOCK DIAGRAM
V_IA 1
ADuM1234
16 V_DDA
V_IB 2
ENCODE
DECODE
15 V_OA
V_DD1 3
14 GND_A
GND₁ 4
13 NC
DISABLE 5
12 NC
NC 6
NC 7
ENCODE
DECODE
V_DD1 8
NC = NO CONNECT
Figure 1.
11 V_DDB
10 V_OB
9 GND_B
1 _{Protected by U.S. Patents 5,952,849; 6,873,065; 7,075,329. Other patents pending.}
Rev. 0
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