ADuM3474 Datasheet PDF - Analog Devices
| Part Number | ADuM3474 | |
| Description | PWM Controller and Transformer Driver | |
| Manufacturers | Analog Devices | |
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Data Sheet
PWM Controller and Transformer
Driver with Quad-Channel Isolators
ADuM3470/ADuM3471/ADuM3472/ADuM3473/ADuM3474
FEATURES
Isolated PWM controller
Integrated transformer driver
Regulated adjustable output: 3.3 V to 24 V
2 W output power
70% efficiency at guaranteed load of 400 mA at 5.0 V output
Quad dc-to-25 Mbps (NRZ) signal isolation channels
20-lead SSOP package
High temperature operation: 105°C maximum
High common-mode transient immunity: >25 kV/µs
200 kHz to 1 MHz adjustable oscillator frequency
Soft start function at power-up
Pulse-by-pulse overcurrent protection
Thermal shutdown
Safety and regulatory approvals
UL recognition: 2500 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice #5A
VDE certificate of conformity
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
VIORM = 560 V peak
Qualified for automotive applications
APPLICATIONS
RS-232/RS-422/RS-485 transceivers
Industrial field bus isolation
Power supply start-up bias and gate drives
Isolated sensor interfaces
Process controls
Automotive
GENERAL DESCRIPTION
The ADuM3470/ADuM3471/ADuM3472/ADuM3473/
ADuM3474 devices1 are quad-channel digital isolators with an
integrated PWM controller and transformer driver for an isolated
dc-to-dc converter. Based on the Analog Devices, Inc., iCoupler®
technology, the dc-to-dc converter provides up to 2 W of regulated,
isolated power at 3.3 V to 24 V from a 5.0 V input supply or from
a 3.3 V supply. This eliminates the need for a separate, isolated
dc-to-dc converter in 2 W isolated designs. The iCoupler chip scale
transformer technology is used to isolate the logic signals, and the
integrated transformer driver with isolated secondary side control
provides higher efficiency for the isolated dc-to-dc converter. The
result is a small form factor, total isolation solution. The ADuM347x
isolators provide four independent isolation channels in a variety of
channel configurations and data rates (see the Ordering Guide).
VDD1
VDDA
VIA/VOA
VIB/VOB
VIC/VOC
VID/VOD
1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. Other patents pending.
FUNCTIONAL BLOCK DIAGRAMS
T1
RECT
X1 X2
VREG
ADuM3470/ADuM3471/
ADuM3472/ADuM3473/
DRIVER
ADuM3474
REG
PRIMARY
CONVERTER
FB
SECONDA RY
CONTROLLER
CH A
VDD2
5V
FB
OC
VISO
PRIMARY
DATA
I/O
4CH
CH B
CH C
CH D
SECONDA RY
DATA
I/O
4CH
GND1
GND2
Figure 1. Functional Block Diagram
VIA/VOA
VIB/VOB
VIC/VOC
VID/VOD
ADuM3470
ADuM3471
ADuM3472
ADuM3473
ADuM3474
Figure 2. Block Diagrams of I/O Channels
Rev. B
Document Feedback
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2010–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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Data Sheet
ADuM3470/ADuM3471/ADuM3472/ADuM3473/ADuM3474
ELECTRICAL CHARACTERISTICS—3.3 V PRIMARY INPUT SUPPLY/3.3 V SECONDARY ISOLATED SUPPLY
3.0 V ≤ VDD1 = VDDA ≤ 3.6 V; VDD2 = VREG = VISO = 3.3 V; fSW = 500 kHz; all voltages are relative to their respective grounds (see the
application schematic in Figure 38). All minimum/maximum specifications apply over the entire recommended operating range, unless
otherwise noted. All typical specifications are at TA = 25°C, VDD1 = VDDA = 3.3 V, VDD2 = VREG = VISO = 3.3 V.
Table 2.
Parameter
DC-TO-DC CONVERTER POWER SUPPLY
Isolated Output Voltage
Feedback Voltage Setpoint
Line Regulation
Load Regulation
Output Ripple
Output Noise
Switching Frequency
Switch On Resistance
Undervoltage Lockout, VDD1, VDD2
Supplies
Positive Going Threshold
Negative Going Threshold
Hysteresis
DC to 2 Mbps Data Rate1
Maximum Output Supply Current2
Efficiency at Maximum Output
Supply Current3
iCOUPLER DATA CHANNELS
DC to 2 Mbps Data Rate1
IDD1 Supply Current, No VISO Load
ADuM3470
ADuM3471
ADuM3472
ADuM3473
ADuM3474
25 Mbps Data Rate (C Grade Only)
IDD1 Supply Current, No VISO Load
ADuM3470
ADuM3471
ADuM3472
ADuM3473
ADuM3474
Available VISO Supply Current4
ADuM3470
ADuM3471
ADuM3472
ADuM3473
ADuM3474
IDD1 Supply Current, Full VISO Load
I/O Input Currents
Symbol
VISO
VFB
VISO (LINE)
VISO (LOAD)
VISO (RIP)
VISO (N)
fSW
RON
Min
3.0
1.125
192
VUV+
VUV−
VUVH
IISO (MAX)
250
IDD1 (Q)
IDD1 (D)
IISO (LOAD)
IDD1 (MAX)
IIA, IIB, IIC, IID −10
Typ
3.3
1.25
1
1
50
100
1000
200
318
0.6
Max
3.6
1.375
10
2
515
Unit Test Conditions/Comments
V
V
mV/V
%
mV p-p
mV p-p
kHz
kHz
kHz
Ω
IISO = 0 mA, VISO = VFB × (R1 + R2)/R2
IISO = 0 mA
IISO = 50 mA, VDD1 = 3.0 V to 3.6 V
IISO = 20 mA to 100 mA
20 MHz bandwidth,
COUT = 0.1 µF||47 µF, IISO = 100 mA
20 MHz bandwidth,
COUT = 0.1 µF||47 µF, IISO = 100 mA
ROC = 50 kΩ
ROC = 270 kΩ
VOC = VDD2 (open loop)
2.8 V
2.6 V
0.2 V
f ≤ 1 MHz,
mA VISO = 3.3 V
70 % IISO = IISO (MAX)
IISO = 0 mA, f ≤ 1 MHz
9 20 mA
10 20 mA
11 20 mA
11 20 mA
12 20 mA
IISO = 0 mA, CL = 15 pF, f = 12.5 MHz
28 mA
29 mA
31 mA
32 mA
34 mA
CL = 15 pF, f = 12.5 MHz
244 mA
243 mA
241 mA
240 mA
238 mA
350 mA CL = 0 pF, f = 0 MHz, VDD1 = 3.3 V,
IISO = 250 mA
+0.01
+10
µA
Rev. B | Page 5 of 36
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