adum3471 Analog Devices, Inc., adum3471 Datasheet - Page 18

• Manufacturer Part Number: adum3471
• Description: Pwm Controller And Transformer Driver With Quad-channel Isolators Adum3470/adum3471/adum3472/adum3473/adum3474
• Manufacturer: Analog Devices, Inc.

ADuM3470/ADuM3471/ADuM 3472/ADuM3473/ADuM3474
Table 16. ADuM3474 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
Table 17. Truth Table (Positive Logic)
V
High
Low
1
V
Ix
Ix
Input
and V
Ox
X1
GND
V
X2
V
V
V
V
V
GND
OC
V
V
V
V
FB
V
V
1
refer to the input and output signals of a given channel (A, B, C, or D).
DD1
OA
OB
OC
OD
DDA
ID
IC
IB
IA
DD2
REG
1
2
V
Powered
Powered
CC
State
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 Output 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 Input 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
to 5.5 V range. Connect a 0.1 μF bypass capacitor from V
The input of an internal regulator used to power the secondary side controller and Side 2 data channels. V
in the 5.5 V to 15 V range to regulate the V
1
.
V
Powered
Powered
DD2
State
REG
, the internal regulator regulates the V
*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
V
DDA
DD1
X1
X2
OA
OB
OC
OD
1
1 10
Figure 8. ADuM3474 Pin Configuration
1
2
3
4
5
6
7
8
9
ADuM3474
(Not to Scale)
V
High
Low
TOP VIEW
2
Rev. 0 | Page 18 of 32
Ox
IS RECOMMENDED.
DD2
Output
output to 5.0 V.
DD2
DD1
1
, the secondary controller runs open-loop. To regulate the output
20
19
18
17
16
15
14
13
12
11
pin. Connect a 0.1 μF bypass capacitor from V
ISO
V
GND
V
FB
V
V
V
V
OC
GND
1
REG
DD2
IA
IB
IC
ID
. Use a resistor divider from V
DD2
IS
2
, and the secondary controller runs at a frequency of 200 kHz
2
2
*
*
to GND
Notes
Normal operation, data is high
Normal operation, data is low
DDA
ISO
DD2
= V
pin. Connect a 10 μF bypass capacitor from V
2
pin to 5.0 V. Otherwise, V
.
FB
× (R1 + R2)/R2 formula. The resistor divider is
ISO
to the FB pin to make the V
DD2
should be in the 3.0 V
DDA
to GND
REG
should be
DD1
1
.
to
FB