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ADuM3070 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADuM3070
Beschreibung Isolated Switching Regulator
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 21 Seiten
ADuM3070 Datasheet, Funktion
Data Sheet
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
200 kHz to 1 MHz adjustable oscillator
Soft start function at power-up
Pulse-by-pulse overcurrent protection
Thermal shutdown
2500 V rms isolation
High common-mode transient immunity: >25 kV/µs
16-lead QSOP package
High temperature operation: 105°C
APPLICATIONS
Power supply startup bias and gate drives
Isolated sensor interfaces
Process controls
GENERAL DESCRIPTION
The ADuM30701 isolator is a regulated dc-to-dc isolated power
supply controller with 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.
Isolated Switching Regulator
With Integrated Feedback
ADuM3070
FUNCTIONAL BLOCK DIAGRAM
VDD1
RECT
VISO
VDDA
X1 X2
VREG
ADuM3070
PRIMARY
CONVERTER/
DRIVER
GND1
REG
INTERNA L
FEEDBACK
SECONDA RY
CONTROLLER
GND2
VDD2
5V
FB
OC
NOTES
1. VDD1 IS THE POWER SUPPLY FOR THE PUSH-PULL TRANSFORMER.
2. VDDA IS THE POWER SUPPLY OF SIDE 1 OF THE ADuM3070.
Figure 1.
The ADuM3070 isolator provides 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 small QSOP package provides a smaller form factor than any
discrete solution. The regulated feedback provides a relatively flat
efficiency curve over the full output power range. The ADuM3070
enables 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.
1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7075 329 B2. Other patents are pending.
Rev. A
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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 ©2012–2014 Analog Devices, Inc. All rights reserved.
Technical Support
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ADuM3070 Datasheet, Funktion
Data Sheet
ADuM3070
PACKAGE CHARACTERISTICS
Table 5.
Parameter
RESISTANCE
Input to Output1
CAPACITANCE
Input to Output1
THERMAL
IC Junction-to-Ambient Thermal Resistance2
Thermal Shutdown
Threshold
Hysteresis
Symbol
RI-O
CI-O
Min Typ Max Unit
1012
2.2 pF
θJA
TSSD
TSSD-HYS
76 °C/W
150 °C
20 °C
1 The device is considered a 2-terminal device: Pin 1 to Pin 8 is shorted together, and Pin 9 to Pin 16 is shorted together.
2 The thermocouple is located at the center of the package underside.
Test Conditions/Comments
f = 1 MHz
TJ rising
REGULATORY APPROVALS (PENDING)
Table 6.
UL
Recognized under the UL 1577
Component Recognition Program1
Single Protection, 2500 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,
400 V rms (848 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, 560 V peak
File 2471900-4880-0001
1 In accordance with UL 1577, each ADuM3070 is proof tested by applying an insulation test voltage of ≥3000 V rms for 1 sec (current leakage detection limit = 10 µA).
2 In accordance with DIN V VDE V 0884-10, each ADuM3070 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
2500
>3.8
Unit
V rms
mm
Minimum External Tracking (Creepage)
L(I02) >3.1 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
along the printed circuit board (PCB) seating plane
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. A | Page 5 of 20

6 Page









ADuM3070 pdf, datenblatt
Data Sheet
5
4
3
2
1 LOAD = 10mA
LOAD = 50mA
LOAD = 500mA
0
0 5 10 15 20 25 30
TIME (ms)
Figure 16. Typical VISO Startup at 5 V In to 3.3 V Out with
10 mA, 50 mA, and 500 mA Output Load
5
4
3
2
1 LOAD = 10mA
LOAD = 50mA
LOAD = 250mA
0
0 5 10 15 20 25 30
TIME (ms)
Figure 17. Typical VISO Startup at 3.3 V In to 3.3 V Out with
10 mA, 50 mA, and 250 mA Output Load
18
16
14
12
10
8
6
4
LOAD = 10mA
2 LOAD = 20mA
LOAD = 100mA
0
0 5 10 15 20 25 30
TIME (ms)
Figure 18. Typical VISO Startup at 5 V In to 15 V Out with
10 mA, 20 mA, and 100 mA Output Load
ADuM3070
5.75
5.25
4.75
4.25
5.75
5.25
4.75
4.25
COUT = 47µF, L1 = 47µH
COUT = 47µF, L1 = 100µH
1.0
10% LOAD
90% LOAD
0.5
0
–2 0 2 4 6 8 10 12 14
TIME (ms)
Figure 19. Typical VISO Load Transient Response, 5 V In to 5 V Out at
10% to 90% of 500 mA Load at 500 kHz fSW
5.75
5.25
4.75
4.25
COUT = 47µF, L1 = 47µH
5.75
5.25
4.75
4.25
COUT = 47µF, L1 = 100µH
1.0
10% LOAD
90% LOAD
0.5
0
–2 0 2 4 6 8 10 12 14
TIME (ms)
Figure 20. Typical VISO Load Transient Response, 5 V In to 5 V Out at
10% to 90% of 500 mA Load at 500 kHz fSW with 0.1 µF Feedback Capacitor
4.0
3.5 COUT = 47µF, L1 = 47µH
3.0
2.5
4.0
3.5 COUT = 47µF, L1 = 100µH
3.0
2.5
1.0
10% LOAD
90% LOAD
0.5
0
–2 0 2 4 6 8 10 12 14
TIME (ms)
Figure 21. Typical VISO Load Transient Load Response, 5 V In to 3.3 V Out at
10% to 90% Load of 500 mA Load at 500 kHz fSW
Rev. A | Page 11 of 20

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