adum3471 Analog Devices, Inc., adum3471 Datasheet - Page 17
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adum3471
Manufacturer Part Number
adum3471
Description
Pwm Controller And Transformer Driver With Quad-channel Isolators Adum3470/adum3471/adum3472/adum3473/adum3474
Manufacturer
Analog Devices, Inc.
Datasheet
1.ADUM3471.pdf
(32 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
adum3471ARSZ-RL7
Manufacturer:
SHINDENGEN
Quantity:
21 000
Table 15. ADuM3473 Pin Function Descriptions
Pin No. Mnemonic Description
1
2, 10
3
4
5
6
7
8
9
11, 19
12
13
14
15
16
17
18
20
X1
GND
V
X2
V
V
V
V
V
GND
OC
V
V
V
V
FB
V
V
DD1
IA
OB
OC
OD
DDA
ID
IC
IB
OA
DD2
REG
1
2
Transformer Driver Output 1.
Ground 1. Ground reference for isolator primary.
Transformer Driver Supply Voltage 3.0 V to 5.5 V. Connect to V
GND
Transformer Driver Output 2.
Logic Input A.
Logic Output B.
Logic Output C.
Logic Output D.
Primary Supply Voltage 3.0 V to 5.5 V. Connect to V
Ground Reference for Isolator Side 2.
Oscillator Control Pin. When OC = logic high = V
voltage, connect a resistor between the OC pin and GND
to 1 MHz, as programmed by the resistor value.
Logic Input D.
Logic Input C.
Logic Input B.
Logic Output A.
Feedback Input from the Secondary Output Voltage V
voltage equal to the 1.25 V internal reference level using the V
required even in open-loop mode to provide soft start.
The Internal Supply Voltage Pin for the Secondary Side Controller and Side 2 Data Channels. When a sufficient external
voltage is supplied to V
5.5 V range. Connect a 0.1 μF bypass capacitor from V
The Input of an Internal Regulator to Power the Secondary Side Controller and Side 2 Data Channels. V
the 5.5 V to 15 V range to regulate the V
1
.
REG
,the internal regulator regulates the V
ADuM3470/ADuM3471/ADuM
*GND
*GND
*PIN 2 AND PIN 10 ARE INTERNALLY CONNECTED,
AND CONNECTING BOTH TO GND
RECOMMENDED. PIN 11 AND PIN 19 ARE
INTERNALLY CONNECTED, AND CONNECTING
BOTH TO GND
V
V
V
V
V
DDA
DD1
V
OB
OC
OD
X1
X2
IA
1
1 10
Figure 7. ADuM3473 Pin Configuration
1
2
3
4
5
6
7
8
9
ADuM3473
(Not to Scale)
TOP VIEW
2
DD2
Rev. 0 | Page 17 of 32
IS RECOMMENDED.
output to 5.0 V.
DD2
DD1
, the secondary controller runs open-loop. To regulate the output
20
19
18
17
16
15
14
13
12
11
DD2
pin. Connect a 0.1 μF bypass capacitor from V
ISO
V
GND
V
FB
V
V
V
V
OC
GND
1
REG
DD2
OA
IB
IC
ID
. Use a resistor divider from V
IS
to GND
2
, and the secondary controller runs at a frequency of 200 kHz
2
2
*
*
DDA
ISO
DD2
2
= V
.
pin. Connect a 10 μF bypass capacitor from V
pin to 5.0 V. Otherwise, V
FB
× (R1 + R2)/R2 formula. The resistor divider is
3472/ADuM3473/ADuM3474
ISO
to the FB pin to make the V
DD2
should be in the 3.0 V to
DDA
REG
to GND
should be in
DD1
1
.
to
FB