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PDF ADuM3070 Data sheet ( Hoja de datos )
| Número de pieza | ADuM3070 | |
| Descripción | Isolated Switching Regulator | |
| Fabricantes | Analog Devices | |
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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
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 ©2012–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
ADuM3070
Data Sheet
ELECTRICAL CHARACTERISTICS—5 V PRIMARY INPUT SUPPLY/3.3 V SECONDARY ISOLATED SUPPLY
4.5 V ≤ VDD1 = VDDA ≤ 5.5 V, VDD2 = VREG = VISO = 3.3 V, fSW = 500 kHz, all voltages are relative to their respective grounds, see the application
schematic in Figure 31. All minimum/maximum specifications apply over the entire recommended operating range, unless otherwise noted. All
typical specifications are at TA = 25°C, VDD1 = VDDA = 5.0 V, VDD2 = VREG = VISO = 3.3 V.
Table 3. DC-to-DC Converter Static Specifications
Parameter
Symbol Min
DC-TO-DC CONVERTER SUPPLY
Isolated Output Voltage
VISO 3.0
Feedback Voltage Setpoint
VFB 1.15
Line Regulation
VISO (LINE)
Load Regulation
VISO (LOAD)
Output Ripple
VISO (RIP)
Output Noise
VISO (NOISE)
Switching Frequency
fSW
IDDA Quiescent
Switch On Resistance
Maximum Output Supply Current
Efficiency at Maximum Output Current
IDDA (Q)
RON
IISO (MAX)
209
400
Typ
3.3
1.25
1
1
50
100
1000
200
318
3.5
0.5
500
70
Max
3.63
1.37
10
2
515
5
Unit
V
V
mV/V
%
mV p-p
mV p-p
kHz
kHz
kHz
mA
Ω
mA
%
Test Conditions/Comments
IISO = 0 mA, VISO = VFB × (R1 + R2)/R2
IISO = 0 mA
IISO = 50 mA, VDD11 = VDDA2 = 4.5 V to 5.5V
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)
f ≤ 1 MHz, VISO = 3.3 V
IISO = IISO (MAX), f ≤ 1 MHz
1 VDD1 is the power supply for the push-pull transformer.
2 VDDA is the power supply of Side 1 of the ADuM3070.
ELECTRICAL CHARACTERISTICS—5 V PRIMARY INPUT SUPPLY/15 V SECONDARY ISOLATED SUPPLY
4.5 V ≤ VDD1 = VDDA ≤ 5.5 V, VREG = VISO = 15 V, VDD2 = 5.0 V, fSW = 500 kHz, all voltages are relative to their respective grounds, see the
application schematic in Figure 32. All minimum/maximum specifications apply over the entire recommended operating range, unless
otherwise noted. All typical specifications are at TA = 25°C, VDD1 = VDDA = 5.0 V, VREG = VISO = 15 V, VDD2 = 5.0 V.
Table 4. DC-to-DC Converter Static Specifications
Parameter
Symbol Min
DC-TO-DC CONVERTER SUPPLY
Isolated Output Voltage
VISO 13.8
Feedback Voltage Setpoint
VFB 1.15
VDD2 Linear Regulator Voltage
VDD2
4.5
Dropout Voltage
Line Regulation
Load Regulation
Output Ripple
VDD2DO
VISO (LINE)
VISO (LOAD)
VISO (RIP)
Output Noise
VISO (NOISE)
Switching Frequency
fSW
IDDA Quiescent
Switch On Resistance
Maximum Output Supply Current
Efficiency at Maximum Output Current
IDDA (Q)
RON
IISO (MAX)
192
100
Typ
15.0
1.25
5.0
0.5
1
1
200
500
1000
200
318
3.5
0.5
140
70
Max
16.5
1.37
5.48
1.5
20
3
515
5
Unit
V
V
V
V
mV/V
%
mV p-p
mV p-p
kHz
kHz
kHz
mA
Ω
mA
%
Test Conditions/Comments
IISO = 0 mA, VISO = VFB × (R1 + R2)/R2
IISO = 0 mA
VREG = 7 V to 15 V, IDD2 = 0 mA to 50 mA
IDD2 = 50 mA
IISO = 50 mA, VDD11 = VDDA2 = 4.5 V to 5.5 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)
f ≤ 1 MHz, VISO = 15.0 V
IISO = IISO (MAX), f ≤ 1 MHz
1 VDD1 is the power supply for the push-pull transformer.
2 VDDA is the power supply of Side 1 of the ADuM3070.
Rev. A | Page 4 of 20
5 Page 
ADuM3070
80
70
60
50
40
30
20
TA = –40°C
10 TA = +25°C
TA = +105°C
0
0 50 100 150 200 250 300
LOAD CURRENT (mA)
Figure 10. Typical Efficiency at 3.3 V In to 5 V Out over Temperature with
1:3 Halo Transformer (TGSAD-290V6LF) at 500 kHz fSW
90
80
70
60
50
40
30
20 fSW = 1MHz
fSW = 700kHz
10 fSW = 500kHz
fSW = 200kHz
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140
LOAD CURRENT (mA)
Figure 11. 5 V In to 15 V Out Efficiency at Various Switching Frequencies with
1:3 Coilcraft Transformer (JA4650-BL)
90
80
70
60
50
40
30
20 fSW = 1MHz
fSW = 700kHz
10 fSW = 500kHz
fSW = 200kHz
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140
LOAD CURRENT (mA)
Figure 12. 5 V In to 15 V Out Efficiency at Various Switching Frequencies with
1:3 Halo Transformer (TGSAD-290V6LF)
Data Sheet
90
80
70
60
50
40
30
20
TA = –40°C
10 TA = +25°C
TA = +105°C
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140
LOAD CURRENT (mA)
Figure 13. 5 V In to 15 V Out Efficiency over Temperature with 1:3 Coilcraft
Transformer (JA4650-BL) at 500 kHz fSW
80
70
60
50
40
30
20
10 5V IN TO 12V OUT
5V IN TO 15V OUT
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70
LOAD CURRENT (mA)
Figure 14. Double-Supply Efficiency with 1:5 Coilcraft Transformer (KA4976-AL)
at 500 kHz fSW
6
5
4
3
2
1 LOAD = 10mA
LOAD = 50mA
LOAD = 500mA
0
0 5 10 15 20 25 30
TIME (ms)
Figure 15. Typical VISO Startup at 5 V In to 5 V Out with
10 mA, 50 mA, and 500 mA Output Load
Rev. A | Page 10 of 20
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet ADuM3070.PDF ] | |
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