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KA4976-AL Datenblatt(PDF) 8 Page - Analog Devices

Teilenummer KA4976-AL
Bauteilbeschribung  Isolated Switching Regulator
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ADuM3070
Data Sheet
Rev. 0 | Page 8 of 20
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Figure 3. Pin Configuration
See Application Note AN-1109 for specific layout guidelines.
Table 12. Pin Function Descriptions
Pin No.
Mnemonic Description
1
X1
Transformer Driver Output 1.
2, 8
GND1
Ground Reference for Primary Side.
3, 11, 12
NC
No Connect. Do not connect to this pin.
5, 6
TP
Test Point. Do not connect to this pin.
4
X2
Transformer Driver Output 2.
7
VDDA
Primary Supply Voltage 3.0 V to 5.5 V. Connect to VDD1. Connect a 0.1 µF bypass capacitor from VDDA to GND1.
9, 15
GND2
Ground Reference for Secondary Side.
10
OC
Oscillator Control Pin. When OC = logic high = VDD2, the secondary controller runs open-loop. To regulate the
output voltage, connect a resistor between the OC pin and GND2, and the secondary controller runs at a
frequency of 200 kHz to 1 MHz, as programmed by the resistor value.
13
FB
Feedback Input from the Secondary Output Voltage VISO. Use a resistor divider from VISO to the FB pin to make
the VFB voltage equal to the 1.25 V internal reference level using the VISO = VFB × (R1 + R2)/R2 formula. The resistor
divider is required even in open-loop mode to provide soft start.
14
VDD2
Internal Supply Voltage Pin for the Secondary Side Controller. When a sufficient external voltage is supplied to
VREG, the internal regulator regulates the VDD2 pin to 5.0 V. Otherwise, VDD2 should be in the 3.0 V to 5.5 V range.
Connect a 0.1 µF bypass capacitor from VDD2 to GND2.
16
VREG
Input of the Internal Regulator to Power the Secondary Side Controller. VREG should be in the 5.5 V to 15 V range
to regulate the VDD2 output to 5.0 V.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
*GND1
NC
X2
VDDA
TP
TP
X1
GND2*
VDD2
FB
OC
*GND1
GND2*
NC
NC
VREG
TOP VIEW
(Not to Scale)
ADuM3070
*PIN 2 AND PIN 8 ARE INTERNALLY CONNECTED,
AND CONNECTING BOTH TO GND1 IS
RECOMMENDED. PIN 9 AND PIN 15 ARE
INTERNALLY CONNECTED, AND CONNECTING
BOTH TO GND2 IS RECOMMENDED.
NOTES
1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.
2. TP = TEST POINT. DO NOT CONNECT TO THIS PIN.


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