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ADuM4473 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADuM4473
Beschreibung Isolated Switching Regulator
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 30 Seiten
ADuM4473 Datasheet, Funktion
Isolated Switching Regulator
with Quad-Channel Isolators
Data Sheet ADuM4470/ADuM4471/ADuM4472/ADuM4473/ADuM4474
FEATURES
Isolated PWM feedback with built in compensation
Primary side transformer driver for up to 2.5 W output power
with 5 V input voltage
Regulated adjustable output: 3.3 V to 24 V
Up to 80% efficiency
Quad dc-to-25 Mbps (NRZ) signal isolation channels
200 kHz to 1 MHz adjustable oscillator
Soft start function at power-up
Pulse-by-pulse overcurrent protection
Thermal shutdown
5000 V rms isolation
High common-mode transient immunity: >25 kV/μs
20-lead SOIC package with 8.3 mm creepage
High temperature operation: 105°C
APPLICATIONS
Power supply start-up bias and gate drives
Isolated sensor interfaces
Process controls
RS-232/RS-422/RS-485 transceivers
VDD1
VDDA
I/OA
I/OB
I/OC
I/OD
FUNCTIONAL BLOCK DIAGRAM
RECT
VISO
VREG
ADuM4470/
ADuM4471/
ADuM4472/
ADuM4473/
ADuM4474
PRIMARY
REG
CONTROLLER/
DRIVER
SECONDARY
CONTROLLER
INTERNAL
FEEDBACK
VDD2
5V
FB
OC
PRIMARY
DATA I/O
4-CHANNEL
GND1
CHA
CHB
CHC
SECONDARY
DATA I/O
4-CHANNEL
CHD
GND2
I/OA
I/OB
I/OC
I/OD
Figure 1.
GENERAL DESCRIPTION
The ADuM4470/ADuM4471/ADuM4472/ADuM4473/
ADuM44741 are quad-channel, digital isolators with a regu-
lated dc-to-dc isolated power supply controller and an internal
MOSFET driver. The dc-to-dc controller has an internal isolated
PWM feedback from the secondary side, based on the
iCoupler® chip scale transformer technology and complete loop
compensation. This eliminates the need to use an optocoupler
for feedback and compensates the loop for stability.
The ADuM447x isolators provide a more stable output voltage
and higher efficiency compared to unregulated isolated dc-
to-dc power supplies. The fully integrated feedback and loop
compensation in a wide-body SOIC package provide a smaller
form factor and 8.3 mm creepage distance solution.
The regulated feedback provides a relatively flat efficiency curve
over the full output power range. The ADuM447x enable a dc-
to-dc converter with a 3.3 V to 24 V isolated output voltage
range from either a 5.0 V or a 3.3 V input voltage, with an
output power of up to 2.5 W.
The ADuM447x isolators provide four independent isolation
channels in a variety of channel configurations and data rates.
(The x in ADuM447x throughout this data sheet stands for the
ADuM4470/ADuM4471/ADuM4472/ADuM4473/ADuM4474.)
1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7075 329 B2. Other patents pending.
Rev. 0
Document Feedback
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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.
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
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ADuM4473 Datasheet, Funktion
ADuM4470/ADuM4471/ADuM4472/ADuM4473/ADuM4474
Data Sheet
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 48. 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. DC-to-DC Converter Static Specifications
Parameter
Symbol
DC-TO-DC CONVERTER SUPPLY
Isolated Output Voltage
VISO
Feedback Voltage Setpoint
Line Regulation
VFB
VISO (LINE)
Load Regulation
Output Ripple
VISO (LOAD)
VISO (RIP)
Output Noise
VISO (NOISE)
Switching Frequency
fSW
Switch On-Resistance
Undervoltage Lockout, VDDA, VDD2 Supplies
Positive Going Threshold
Negative Going Threshold
Hysteresis
DC to 2 Mbps Data Rate3
Maximum Output Supply Current4
Efficiency at Maximum Output Current5
iCoupler DATA CHANNELS
DC to 2 Mbps Data Rate
IDD1 Supply Current, No VISO Load
ADuM4470
ADuM4471
ADuM4472
ADuM4473
ADuM4474
25 Mbps Data Rate (CRIZ Grade Only)
IDD1 Supply Current, No VISO Load
ADuM4470
ADuM4471
ADuM4472
ADuM4473
ADuM4474
Available VISO Supply Current6
ADuM4470
ADuM4471
ADuM4472
ADuM4473
ADuM4474
IDD1 Supply Current, Full VISO Load
I/O Input Currents
Logic High Input Threshold
Logic Low Input Threshold
RON
VUV+
VUV−
VUVH
IISO (MAX)
IDD1 (Q)
IDD1 (D)
IISO (LOAD)
IIA, IIB, IIC, IID
VIH
VIL
Min
3.0
1.15
192
250
−10
1.6
Typ
3.3
1.25
1
1
50
100
1000
200
318
0.6
2.8
2.6
0.2
68
9
10
11
11
12
28
29
31
32
34
244
243
241
240
238
350
+0.01
Max
3.6
1.37
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,
VDD11 = VDDA2 = 4.5 V to 5.5 V
IISO = 50 mA to 200 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)
V
V
V
mA f ≤ 1 MHz, VISO = 5.0 V
% IISO = IISO ,(MAX) f ≤ 1 MHz
IISO = 0 mA, f ≤ 1MHz
20 mA
20 mA
20 mA
20 mA
20 mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
+10 µA
V
0.4 V
IISO = 0 mA, CL = 15 pF, f = 12.5 MHz
IISO = 0 mA, CL = 15 pF, f = 12.5 MHz
IISO = 0 mA, CL = 15 pF, f = 12.5 MHz
IISO = 0 mA, CL = 15 pF, f = 12.5 MHz
IISO = 0 mA, CL = 15 pF, f = 12.5 MHz
fSW = 500 kHz
CL = 15 pF, f = 12.5 MHz
CL = 15 pF, f = 12.5 MHz
CL = 15 pF, f = 12.5 MHz
CL = 15 pF, f = 12.5 MHz
CL = 15 pF, f = 12.5 MHz
CL = 0 pF, f = 0 MHz, VDD1 = VDDA = 5 V,
IISO = 400 mA
Rev. 0 | Page 6 of 36

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ADuM4473 pdf, datenblatt
ADuM4470/ADuM4471/ADuM4472/ADuM4473/ADuM4474
Data Sheet
PACKAGE CHARACTERISTICS
Table 5.
Parameter
Symbol Min Typ Max Unit Test Conditions/Comments
Resistance (Input to Output)1
Capacitance (Input to Output)1
IC Junction to Ambient Thermal Resistance
RI-O
CI-O
θJA
1012
2.2 pF f = 1 MHz
45 °C/W Thermocouple located at center of package underside,
test conducted on 4-layer board with thin traces2
Thermal Shutdown
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
TSSD
TSSD-HYS
150 °C TJ rising
20 °C
1 The device is considered a 2-terminal device: Pin 1 to Pin 10 are shorted together; and Pin 11 to Pin 20 are shorted together.
2 See the Thermal Analysis section for thermal model definitions.
REGULATORY APPROVALS (PENDING)
Table 6.
UL
Recognized under the UL 1577
component recognition program1
Single protection, 5000 V rms
isolation voltage
File E214100
CSA
Approved under CSA Component
Acceptance Notice #5A
Basic insulation per CSA 60950-1-03 and IEC 60950-1, 600 V
rms (848 V peak) maximum working voltage
Reinforced insulation per CSA60950-1-03 and IEC 60950-1,
400 V rms (565 V peak) maximum working voltage
Reinforced insulation per IEC 60601-1 250 V rms
(353 V peak) maximum working voltage
File 205078
VDE
Certified according to DIN V VDE V
0884-10 (VDE V 0884-10):2006-122
Reinforced insulation, 849 V peak
File 2471900-4880-0001
1 In accordance with UL 1577, each ADuM447x is proof tested by applying an insulation test voltage of ≥6000 V rms for 1 sec (current leakage detection limit = 10 µA).
2 In accordance with DIN V VDE V 0884-10, each of the ADuM447x is proof tested by applying an insulation test voltage of ≥1050 V peak for 1 sec (partial discharge
detection limit = 5 pC). The asterisk (*) marking branded on the component designates DIN V VDE V 0884-10 approval.
INSULATION AND SAFETY-RELATED SPECIFICATIONS
Table 7.
Parameter
Rated Dielectric Insulation Voltage
Minimum External Air Gap (Clearance)
Symbol
L(I01)
Value
5000
>8.0
Unit
V rms
mm
Minimum External Tracking (Creepage)
L(I02) >8.3 mm
Minimum Internal Gap (Internal Clearance)
Tracking Resistance (Comparative Tracking Index) CTI
Isolation Group
0.017 min mm
>400
V
II
Test Conditions/Comments
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
Distance through insulation
DIN IEC 112/VDE 0303 Part 1
Material Group (DIN VDE 0110, 1/89, Table 1)
Rev. 0 | Page 12 of 36

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