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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/s High temperature operation: 105C Narrow body, 16-lead SOIC Safety and regulatory approvals (pending) UL recognition UL 1577 1000 V rms input-to-output withstand voltage
GENERAL DESCRIPTION
The ADUM7234 1 is an isolated, half-bridge gate driver that employs the Analog Devices, Inc., iCoupler(R) 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.
APPLICATIONS
Isolated IGBT/MOSFET gate drives Plasma displays Industrial inverters Switching power supplies
FUNCTIONAL BLOCK DIAGRAM
NC 1 VIA 2 VIB 3 VDD1 4 GND1 5 DISABLE 6 VDD1 7 NC 8 ENCODE DECODE
ADUM7234
ENCODE DECODE
16 VDDA 15 VOA 14 GNDA 13 NC 12 NC 11 VDDB 10 VOB 9
GNDB
Figure 1.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 (c)2010 Analog Devices, Inc. All rights reserved.
07990-001
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 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
REVISION HISTORY
1/10--Rev. Sp0 to Rev. A Changes to Table 1 ............................................................................ 3 1/09--Revision Sp0: Initial Version
Rev. A | Page 2 of 12
ADUM7234 SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
All voltages are relative to their respective ground. 4.5 V VDD1 5.5 V, 12 V VDDA 18 V, 12 V VDDB 18 V. All minimum/maximum specifications apply over the entire recommended operating range, unless otherwise noted. All typical specifications are at TA = 25C, VDD1 = 5 V, VDDA = 15 V, VDDB = 15 V. Table 1.
Parameter DC SPECIFICATIONS Input Supply Current, Quiescent Output Supply Current A or Output Supply Current B, Quiescent Input Supply Current, 2 Mbps Output Supply Current A or Output Supply Current B, 2 Mbps Input Currents Logic High Input Threshold Logic Low Input Threshold Logic High Output Voltages Logic Low Output Voltages Undervoltage Lockout, VDDA or VDDB Supply Positive-Going Threshold Negative-Going Threshold Hysteresis Output Short-Circuit Pulsed Current 1 SWITCHING SPECIFICATIONS Minimum Pulse Width 2 Maximum Switching Frequency 3 Propagation Delay 4 Change vs. Temperature Pulse Width Distortion, |tPLH - tPHL| Channel-to-Channel Matching, Rising or Falling Edges 5 Channel-to-Channel Matching, Rising vs. Falling Edges 6 Part-to-Part Matching, Rising or Falling Edges 7 Part-to-Part Matching, Rising vs. Falling Edges 8 Output Rise/Fall Time (10% to 90%)
1 2 3
Symbol IDDI(Q) IDDA(Q), IDDB(Q) IDDI(2) IDDA(2), IDDB(2) IIA, IIB, IDISABLE VIH VIL VOAH,VOBH VOAL,VOBL VDDBUV+ VDDBUVVDDBUVH IOA(SC), IOB(SC) PW tPHL, tPLH PWD
Min
Typ 1.0 1.5 1.4 22
Max 2.2 3.2 3.0 30 +10 0.3 x VDD1
Unit mA mA mA mA A V V V V
Test Conditions
CL = 1000 pF 0 VIA, VIB, VDISABLE VDD1
-10 0.7 x VDD1 VDDA - 0.15, VDDB - 0.15
+0.01
VDDA, VDDB 0.15
IOA, IOB = -20 mA IOA, IOB = 20 mA
8.0 7.4 0.3 2.0
8.9 8.2 0.7 4.0
9.8 9.0 A 100 ns Mbps ns ps/C ns ns ns ns ns ns CL = 1000 pF CL = 1000 pF CL = 1000 pF CL = 1000 pF CL = 1000 pF CL = 1000 pF CL = 1000 pF CL = 1000 pF, input tr = 3 ns CL = 1000 pF, input tr = 3 ns CL = 1000 pF
2 130
160 130
200 14 11 25 55 63 30
tR/tF
8
14
Short-circuit duration less than 1 second. Average power must conform to the limit shown under the Absolute Maximum Ratings. The minimum pulse width is the shortest pulse width at which the specified timing parameters are guaranteed. The maximum switching frequency is the maximum signal frequency at which the specified timing parameters are guaranteed. 4 tPHL 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. tPLH propagation delay is measured from the 50% level of the rising edge of the VIx signal to the 50% level of the rising edge of the VOx signal. 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.
Rev. A | Page 3 of 12
ADUM7234
PACKAGE CHARACTERISTICS
Table 2.
Parameter Resistance (Input-to-Output) 1 Capacitance (Input-to-Output)1 Input Capacitance IC Junction-to-Ambient Thermal Resistance
1
Symbol RI-O CI-O CI JA
Min
Typ 1012 2.0 4.0 76
Max
Unit pF pF C/W
Test Conditions f = 1 MHz
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 Rated Dielectric Insulation Voltage Minimum External Air Gap (Clearance) Minimum External Tracking (Creepage) Minimum Internal Gap (Internal Clearance) Tracking Resistance (Comparative Tracking Index) Isolation Group Maximum Working Voltage Compatible with 50 Years Service Life Symbol L(I01) L(I02) Value 1000 4.0 min 4.0 min 0.025 min >600 I 354 Unit V rms mm mm mm V V peak Conditions 1 minute duration Measured from input terminals to output terminals, shortest distance through air Measured from input terminals to output terminals, shortest distance path along body Insulation distance through insulation DIN IEC 112/VDE 0303 Part 1 Material Group (DIN VDE 0110, 1/89, Table 1) Continuous peak voltage across the isolation barrier
CTI VIORM
RECOMMENDED OPERATING CONDITIONS
Table 4.
Parameter Operating Temperature Input Supply Voltage 1 Output Supply Voltages1 Input Signal Rise and Fall Times Common-Mode Transient Immunity, Input-to-Output 2 Common-Mode Transient Immunity, Between Outputs2 Transient Immunity, Supply Voltages2
1 2
Symbol TA VDD1 VDDA, VDDB
Min -40 4.5 12 -35 -35 -35
Max +105 5.5 18 100 +35 +35 +35
Unit C V V ns kV/s kV/s kV/s
All voltages are relative to their respective ground. See the Common-Mode Transient Immunity section for additional data.
REGULATORY INFORMATION
The ADUM7234 is approved by the organization listed in Table 5. Table 5.
UL (Pending) Recognized under 1577 component recognition program 1 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 A).
Rev. A | Page 4 of 12
ADUM7234 ABSOLUTE MAXIMUM RATINGS
Table 6.
Parameter Storage Temperature (TST) Ambient Operating Temperature (TA) Input Supply Voltage (VDD1) 1 Output Supply Voltage1 (VDDA, VDDB) Input Voltage1 (VIA, VIB) Output Voltage1 VOA VOB Input-to-Output Voltage 2 Output Differential Voltage 3 Output DC Current (IOA, IOB) Common-Mode Transients 4
1 2
Rating -55C to +150C -40C to +105C -0.5 V to +7.0 V -0.5 V to +27 V -0.5 V to VDDI + 0.5 V -0.5 V to VDDA + 0.5 V -0.5 V to VDDB + 0.5 V -350 V peak to +350 V peak 350 V peak -800 mA to +800 mA -100 kV/s to +100 kV/s
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; Functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Ambient temperature = 25C, unless otherwise noted.
ESD CAUTION
All voltages are relative to their respective ground. Input-to-output voltage is defined as GNDA - GND1 or GNDB - GND1. 3 Output differential voltage is defined as GNDA - GNDB. 4 Refers to common-mode transients across any insulation barrier. Common-mode transients exceeding the absolute maximum ratings may cause latch-up or permanent damage.
Rev. A | Page 5 of 12
ADUM7234 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
NC 1 VIA 2 VIB 3 VDD1 4 GND1 5 DISABLE 6 VDD1 7 NC 8 NC = NO CONNECT
16 VDDA 15 VOA 14 GNDA 13 NC 12 NC 11 VDDB 10 VOB 9
07990-002
ADUM7234
TOP VIEW (Not to Scale)
GNDB
Figure 2. Pin Configuration
Table 7. ADUM7234 Pin Function Descriptions
Pin No. 1, 8, 12 13 2 3 4, 7 5 6 9 10 11 14 15 16 Mnemonic NC VIA VIB VDD1 GND1 DISABLE GNDB VOB VDDB GNDA VOA VDDA Description No Connect. Pin 12 and Pin 13 are floating and should be left unconnected. Logic Input A. Logic Input B. Input Supply Voltage, 4.5 V to 5.5 V. Pin 4 and Pin 7 are internally connected. Connecting both pins to VDD1 is recommended. Ground Reference for Input Logic Signals. Input Disable. Disables the isolator inputs and refresh circuits. Outputs take on the default low state. Ground Reference for Output B. Output B. Output B Supply Voltage, 12 V to 18 V. Ground Reference for Output A. Output A. Output A Supply Voltage, 12 V to 18 V.
Table 8. Truth Table (Positive Logic)
VIA/VIB Input H L X X VDD1 State Powered Powered Unpowered Powered DISABLE L L X H VOA/VOB Output H L L L Notes
Output returns to the input state within 1 s of VDD1 power restoration.
Rev. A | Page 6 of 12
ADUM7234 TYPICAL PERFORMANCE CHARACTERISTICS
1.2 166 164 1.0 CHANNEL A FALL
PROPAGATION DELAY (ns)
CHANNEL B FALL
INPUT CURRENT (mA)
0.8
162 160 158 CHANNEL A RISE 156 CHANNEL B RISE 154 152 4.5
0.6
0.4
0.2
07990-012
0
0.5
1.0 DATA RATE (Mbps)
1.5
2.0
5.0 INPUT SUPPLY VOLTAGE (V)
5.5
Figure 3. Typical Input Supply Current Variation with Data Rate
Figure 6. Typical Propagation Delay Variation with Input Supply Voltage (Output Supply Voltage = 15.0 V)
166 164
25
CHANNEL A FALL CHANNEL B FALL
PROPAGATION DELAY (ns)
20
OUTPUT CURRENT (mA)
162 160 158 CHANNEL A RISE 156 CHANNEL B RISE 154
15
10
5
07990-013
0
0.5
1.0 DATA RATE (Mbps)
1.5
2.0
15 OUTPUT SUPPLY VOLTAGE (V)
18
Figure 4. Typical Output Supply Current Variation with Data Rate
160
Figure 7. Typical Propagation Delay Variation with Output Supply Voltage (Input Supply Voltage = 5.0 V)
PROPAGATION DELAY (ns)
155
150
145
-20
0
20 40 60 TEMPERATURE (C)
80
100
120
Figure 5. Typical Propagation Delay Variation with Temperature
07990-014
140 -40
Rev. A | Page 7 of 12
07990-016
0
152 12
07990-015
0
ADUM7234 APPLICATIONS INFORMATION
COMMON-MODE TRANSIENT IMMUNITY
In general, common-mode transients consist of linear and sinusoidal components. The linear component of a commonmode transient is given by VCM, linear = (V/t)t where V/t is the slope of the transient shown in Figure 11 and Figure 12. The transient of the linear component is given by Figure 8 characterizes the ability of the ADUM7234 to operate correctly in the presence of linear transients. The data, based on design simulation, is the maximum linear transient magnitude that the ADUM7234 can tolerate without an operational error. This data shows a correlation with the data that is listed in Table 4, which is based on measured data.
50 45 40
Figure 9 and Figure 10 characterize the ability of the ADUM7234 to operate correctly in the presence of sinusoidal transients. The data is based on design simulation and is the maximum sinusoidal transient magnitude (2f V0) that the ADUM7234 can tolerate without an operational error. Values for immunity against sinusoidal transients are not included in Table 4 because measurements to obtain such values have not been possible.
250
TRANSIENT IMMUNITY (kV/s)
dVCM/dt = V/t
200
150 BEST-CASE PROCESS VARIATION WORST-CASE PROCESS VARIATION 100
50
0
250
500
TRANSIENT IMMUNITY (kV/s)
35 30 25 20
250
750 1000 1250 FREQUENCY (MHz)
1500
1750
2000
Figure 9. Transient Immunity (Sinusoidal Transients), 27C Ambient Temperature
10 5 -20 0 20 40 TEMPERATURE (C) 60 80 100
07990-003
TRANSIENT IMMUNITY (kV/s)
15
BEST-CASE PROCESS VARIATION WORST-CASE PROCESS VARIATION
200
150 BEST-CASE PROCESS VARIATION WORST-CASE PROCESS VARIATION 100
0 -40
Figure 8. Transient Immunity (Linear Transients) vs. Temperature
The sinusoidal component (at a given frequency) is given by VCM, sinusoidal = V0sin(2ft) where: V0 is the magnitude of the sinusoidal. f is the frequency of the sinusoidal. The transient magnitude of the sinusoidal component is given by dVCM/dt = 2f V0
50
0
250
500
750 1000 1250 FREQUENCY (MHz)
1500
1750
2000
Figure 10. Transient Immunity (Sinusoidal Transients), 100C Ambient Temperature
Rev. A | Page 8 of 12
07990-005
0
07990-004
0
ADUM7234
15V VDD1 GND1 5V 15V VDDA AND VDDB GNDA AND GNDB
t
07990-006
VDDA AND VDDB GNDA AND GNDB VDD1 GND1
15V 5V
V t
V
15V
The insulation lifetime of the ADUM7234 depends on the voltage waveform type imposed across the isolation barrier. The iCoupler insulation structure degrades at different rates depending on whether the waveform is bipolar ac, unipolar ac, or dc. Figure 14, Figure 15, and Figure 16 illustrate these different isolation voltage waveforms. Bipolar ac voltage is the most stringent environment. The goal of a 50-year operating lifetime under the ac bipolar condition determines the maximum working voltage recommended by Analog Devices. In the case of unipolar ac or dc voltage, the stress on the insulation is significantly lower. This allows operation at higher working voltages while still achieving a 50-year service life. The working voltage listed in Table 3 can be applied while maintaining the 50-year minimum lifetime provided the voltage conforms to either the unipolar ac or dc voltage cases. Any cross insulation voltage waveform that does not conform to Figure 15 or Figure 16 should be treated as a bipolar ac waveform, and its peak voltage should be limited to the 50-year lifetime voltage value listed in Table 3. Note that the voltage presented in Figure 15 is shown as sinusoidal for illustration purposes only. It is meant to represent any voltage waveform varying between 0 V and some limiting value. The limiting value can be positive or negative, but the voltage cannot cross 0 V.
RATED PEAK VOLTAGE 0V
07990-009
Figure 11. Common-Mode Transient Immunity Waveforms, Input to Output
15V VDDA /VDDB GNDA/GNDB VDDB /VDDA GNDB/GNDA 15V 15V
t
Figure 12. Common-Mode Transient Immunity Waveforms, Between Outputs
VDDA /VDDB
VDDA /VDDB GNDA/GNDB
t GNDA/GNDB
Figure 13. Transient Immunity Waveforms, Output Supplies
INSULATION LIFETIME
All insulation structures eventually break down when subjected to voltage stress over a sufficiently long period. The rate of insulation degradation depends on the characteristics of the voltage waveform applied across the insulation. In addition to the testing performed by the regulatory agencies, Analog Devices conducts an extensive set of evaluations to determine the lifetime of the insulation structure within the ADUM7234. Analog Devices performs accelerated life testing using voltage levels higher than the rated continuous working voltage. Acceleration factors for several operating conditions are determined. These factors allow calculation of the time to failure at the actual working voltage. Table 3 lists the peak voltage for 50 years of service life for a bipolar ac operating condition and the maximum Analog Devices recommended working voltage. In many cases, the approved working voltage is higher than the 50year service life voltage. Operation at these high working voltages can lead to shortened insulation life in some cases.
07990-008
VDD
07990-007
VDDA /VDDB GNDA/GNDB VDDB /VDDA GNDA/GNDB
15V 15V
V t
V
15V
Figure 14. Bipolar AC Waveform
RATED PEAK VOLTAGE
07990-010
0V
Figure 15. Unipolar AC Waveform
RATED PEAK VOLTAGE
07990-011
0V
Figure 16. DC Waveform
Rev. A | Page 9 of 12
ADUM7234 OUTLINE DIMENSIONS
10.00 (0.3937) 9.80 (0.3858)
16 1 9 8
4.00 (0.1575) 3.80 (0.1496)
6.20 (0.2441) 5.80 (0.2283)
1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0039) COPLANARITY 0.10 0.51 (0.0201) 0.31 (0.0122)
1.75 (0.0689) 1.35 (0.0531) SEATING PLANE
0.50 (0.0197) 0.25 (0.0098) 8 0 1.27 (0.0500) 0.40 (0.0157)
45
0.25 (0.0098) 0.17 (0.0067)
COMPLIANT TO JEDEC STANDARDS MS-012-AC CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
060606-A
Figure 17. 16-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-16) Dimensions shown in millimeters and (inches)
ORDERING GUIDE
Model 1 ADUM7234BRZ ADUM7234BRZ-RL7
1
No. of Channels 2 2
Output Peak Current (A) 4 4
Output Voltage (V) 15 15
Temperature Range -40C to +105C -40C to +105C
Package Description 16-Lead SOIC_N 16-Lead SOIC_N, 7-Inch Tape and Reel Option (1,000 Units)
Package Option R-16 R-16
Z = RoHS Compliant Part.
Rev. A | Page 10 of 12
ADUM7234 NOTES
Rev. A | Page 11 of 12
ADUM7234 NOTES
(c)2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D07990-0-1/10(A)
Rev. A | Page 12 of 12

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