ANALOG DEVICES ADUM7234 Service Manual

Isolated Precision Half-Bridge Driver,

FEATURES

Isolated high-side and low-side outputs
Working Voltage

High-side or low-side relative to input: ±350 V
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

peak

FUNCTIONAL BLOCK DIAGRAM

4 A Output

ADuM7234

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.

NC

V

V

V

DD1

GND

DISABLE

V

DD1

NC

IA

IB

1

ADuM7234

1 16

2 15

3 14

4 13

5

6

7

8

ENCODE DECODE

ENCODE DECODE

1

Protected by U.S. Patents 5,952,849 and 6,291,907.

Rev. A

Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.

V

DDA

V

OA

GND

A

NC

12

NC

11

V

DDB

10

V

OB

9

GND

B

07990-001

Figure 1.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] ©2010 Analog Devices, Inc. All rights reserved.

ADuM7234

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications ....................................................................................... 1 

General Description ......................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 2

Specifications ..................................................................................... 3

Electrical Characteristics ............................................................. 3

Package Characteristics ............................................................... 4

Insulation and Safety-Related Specifications ............................ 4

Recommended Operating Conditions ...................................... 4

REVISION HISTORY

1/10—Rev. Sp0 to Rev. A

Changes to Table 1 ............................................................................ 3

1/09—Revision Sp0: Initial Version

Regulatory Information ................................................................4

Absolute Maximum Ratings ............................................................5

ESD Caution...................................................................................5

Pin Configuration and Function Descriptions ..............................6

Typical Performance Characteristics ..............................................7

Applications Information .................................................................8

Common-Mode Transient Immunity ........................................8

Insulation Lifetime ........................................................................9

Outline Dimensions ....................................................................... 10

Ordering Guide .......................................................................... 10

Rev. A | Page 2 of 12

ADuM7234

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

All voltages are relative to their respective ground. 4.5 V ≤ V
specifications apply over the entire recommended operating range, unless otherwise noted. All typical specifications are at T
V

= 5 V, V

DD1

= 15 V, V

DDA

= 15 V.

DDB

Table 1.

Parameter Symbol Min Typ Max Unit Test Conditions

DC SPECIFICATIONS

Input Supply Current, Quiescent I
Output Supply Current A or Output Supply

DDI(Q)

I

DDA(Q)

Current B, Quiescent
Input Supply Current, 2 Mbps I
Output Supply Current A or Output Supply

DDI(2)

I

DDA(2)

Current B, 2 Mbps
Input Currents IIA, IIB, I
Logic High Input Threshold VIH 0.7 × V
Logic Low Input Threshold VIL 0.3 × V
Logic High Output Voltages V

Logic Low Output Voltages V
Undervoltage Lockout, V

DDA

or V

Supply

DDB

Positive-Going Threshold V

Negative-Going Threshold V

Hysteresis V
Output Short-Circuit Pulsed Current1 I

OAH,VOBH

OAL,VOBL

DDBUV+

DDBUV-

DDBUVH

OA(SC)

SWITCHING SPECIFICATIONS

Minimum Pulse Width2 PW 100 ns CL = 1000 pF
Maximum Switching Frequency3 2 Mbps CL = 1000 pF
Propagation Delay4 t

PHL

, t

Change vs. Temperature 130 ps/°C CL = 1000 pF
Pulse Width Distortion, |t
Channel-to-Channel Matching,

Rising or Falling Edges
Channel-to-Channel Matching,

Rising vs. Falling Edges

PLH

5

− t

| PWD 14 ns CL = 1000 pF

PHL

11 ns C

6

25 ns C

Part-to-Part Matching, Rising or Falling Edges7 55 ns CL = 1000 pF, input tr = 3 ns
Part-to-Part Matching, Rising vs. Falling Edges8 63 ns CL = 1000 pF, input tr = 3 ns
Output Rise/Fall Time (10% to 90%) tR/tF 8 14 30 ns CL = 1000 pF

1

Short-circuit duration less than 1 second. Average power must conform to the limit shown under the . Absolute Maximum Ratings

2

The minimum pulse width is the shortest pulse width at which the specified timing parameters are guaranteed.

3

The maximum switching frequency is the maximum signal frequency at which the specified timing parameters are guaranteed.

4

t

propagation delay is measured from the 50% level of the falling edge of the VIx signal to the 50% level of the falling edge of the VOx signal. t

PHL

measured from the 50% level of the rising edge of the V

5

Channel-to-channel matching, rising, or falling edges, is the magnitude of the propagation delay difference between two channels of the same part when the inputs

are either both rising or falling edges. The supply voltages and the loads on each channel are equal.

6

Channel-to-channel matching, rising vs. falling edges is the magnitude of the propagation delay difference between two channels of the same part when one input is

a rising edge and the other input is a falling edge. The supply voltages and loads on each channel are equal.

7

Part-to-part matching, rising or falling edges, is the magnitude of the propagation delay difference between the same channels of two different parts when the inputs

are either both rising or falling edges. The supply voltages, temperatures, and loads of each part are equal.

8

Part-to-part matching, rising vs. falling edges, is the magnitude of the propagation delay difference between the same channels of two different parts when one input

is a rising edge and the other input is a falling edge. The supply voltages, temperatures, and loads of each part are equal.

signal to the 50% level of the rising edge of the VOx signal.

Ix

≤ 5.5 V, 12 V ≤ V

DD1

≤ 18 V, 12 V ≤ V

DDA

≤ 18 V. All minimum/maximum

DDB

1.0 2.2 mA
, I

1.5 3.2 mA

DDB(Q)

1.4 3.0 mA
, I

22 30 mA CL = 1000 pF

DDB(2)

DISABLE

−10 +0.01 +10 μA 0 ≤ VIA, VIB, V
V

DD1

V

DD1

V
V

DDA

DDB

− 0.15,

− 0.15

, V

V

DDA

V IOA, IOB = −20 mA

DDB

0.15 V IOA, IOB = 20 mA

8.0 8.9 9.8

7.4 8.2 9.0

0.3 0.7

, I

2.0 4.0 A

OB(SC)

130 160 200 ns CL = 1000 pF

PLH

= 1000 pF

L

= 1000 pF

L

= 25°C,

A

≤ V

DISABLE

propagation delay is

PLH

DD1

Rev. A | Page 3 of 12

ADuM7234

PACKAGE CHARACTERISTICS

Table 2.

Parameter Symbol Min Typ Max Unit Test Conditions

Resistance (Input-to-Output)1 R
Capacitance (Input-to-Output)1 C
Input Capacitance CI 4.0 pF
IC Junction-to-Ambient Thermal Resistance θJA 76 °C/W

1

The device is considered a 2-terminal device: Pin 1 through Pin 8 are shorted together, and Pin 9 through Pin 16 are shorted together.

INSULATION AND SAFETY-RELATED SPECIFICATIONS

Table 3.

Parameter Symbol Value Unit Conditions

Rated Dielectric Insulation Voltage 1000 V rms 1 minute duration
Minimum External Air Gap (Clearance) L(I01) 4.0 min mm

Minimum External Tracking (Creepage) L(I02) 4.0 min mm

Minimum Internal Gap (Internal Clearance) 0.025 min mm Insulation distance through insulation
Tracking Resistance (Comparative Tracking Index) CTI >600 V DIN IEC 112/VDE 0303 Part 1
Isolation Group I Material Group (DIN VDE 0110, 1/89, Table 1)
Maximum Working Voltage Compatible with

50 Years Service Life

V

IORM

1012 Ω

I-O

2.0 pF f = 1 MHz

I-O

Measured from input terminals to output terminals,
shortest distance through air

Measured from input terminals to output terminals,
shortest distance path along body

354 V peak

Continuous peak voltage across the isolation
barrier

RECOMMENDED OPERATING CONDITIONS

Table 4.

Parameter Symbol Min Max Unit

Operating Temperature TA −40 +105 °C
Input Supply Voltage1 V
Output Supply Voltages1 V

4.5 5.5 V

DD1

, V

12 18 V

DDA

DDB

Input Signal Rise and Fall Times 100 ns
Common-Mode Transient Immunity, Input-to-Output2 −35 +35 kV/μs
Common-Mode Transient Immunity, Between Outputs2 −35 +35 kV/μs
Transient Immunity, Supply Voltages2 −35 +35 kV/μs

1

All voltages are relative to their respective ground.

2

See the Common-Mode Transient Immunity section for additional data.

REGULATORY INFORMATION

The ADuM7234 is approved by the organization listed in Tabl e 5.

Table 5.

UL (Pending)

Recognized under 1577 component recognition program1
Single/basic insulation, 1000 V rms isolation voltage
File E214100

1

In accordance with UL 1577, each ADuM7234 is proof tested by applying an insulation test voltage of 1200 V rms for 1 sec (current leakage detection limit = 5 μA).

Rev. A | Page 4 of 12