Datasheet ADUM4070 (Analog Devices) - 8

ADuM4070 Data Sheet PIN CONFIGURATION AND FUNCTION DESCRIPTIONS X1 1 16 VREG *GND1 2 15 GND2* NC 3 14 VDD2 ADuM4070 X2 4 13 FB TOP VIEW NC 5 (Not to Scale) 12 NC NC 6 11 NC VDDA 7 10 OC *GND1 8 9 GND2* NOTES 1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN. *PIN 2 AND PIN 8 ARE INTERNALLY CONNECTED; IT IS RECOMMENDED THAT BOTH PINS BE CONNECTED TO A COMMON GROUND. PIN 9 AND PIN 15 ARE INTERNALLY
003
CONNECTED; IT IS RECOMMENDED THAT BOTH PINS BE CONNECTED TO A COMMON GROUND.
10461- Figure 3. Pin Configuration
Table 12. Pin Function Descriptions Pin No. Mnemonic Description
1 X1 Transformer Driver Output 1. 2, 8 GND Ground Reference for the Primary Side of the Isolator. Pin 2 and Pin 8 are internally connected to each other; 1 it is recommended that both pins be connected to a common ground. 3, 5, 6, 11, 12 NC No Connect. Do not connect to this pin. 4 X2 Transformer Driver Output 2. 7 V Supply Voltage for the Primary Side, 3.0 V to 5.5 V. Connect a 0.1 µF bypass capacitor from V to GND . DDA DDA 1 9, 15 GND Ground Reference for the Secondary Side of the Isolator. Pin 9 and Pin 15 are internally connected to each 2 other; it is recommended that both pins be connected to a common ground. 10 OC Oscillator Control Pin. When the OC pin is connected high to the V pin, the secondary controller runs in DD2 open-loop (unregulated) mode. To regulate the output voltage, connect a resistor between the OC pin and GND ; the secondary controller runs at a frequency of 200 kHz to 1 MHz, as programmed by the resistor value. 2 13 FB Feedback Input from the Secondary Output Voltage, V . Use a resistor divider from the V output to the FB ISO ISO pin to set the V voltage equal to the 1.25 V internal reference level using the formula V = V × (R1 + R2)/R2. FB ISO FB The resistor divider is required even in open-loop mode to provide soft start. 14 V Internal Supply Voltage for the Secondary Side. When a sufficient external voltage is supplied to V , DD2 REG the internal regulator regulates the V pin to 5.0 V. Otherwise, V should be in the 3.0 V to 5.5 V range. DD2 DD2 Connect a 0.1 µF bypass capacitor from V to GND . DD2 2 16 V Input of the Internal Regulator to Power the Secondary Side Controller. V should be in the 5.5 V to 15 V REG REG range to regulate the V output to 5.0 V. DD2 Rev. 0 | Page 8 of 20 Document Outline Features Applications Functional Block Diagram General Description Table of Contents Revision History Specifications Electrical Characteristics—5 V Primary Input Supply/5 V Secondary Isolated Supply Electrical Characteristics—3.3 V Primary Input Supply/3.3 V Secondary Isolated Supply Electrical Characteristics—5 V Primary Input Supply/3.3 V Secondary Isolated Supply Electrical Characteristics—5 V Primary Input Supply/15 V Secondary Isolated Supply Package Characteristics Regulatory Approvals (Pending) Insulation and Safety-Related Specifications DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 Insulation Characteristics Recommended Operating Conditions Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Applications Information Application Schematics Transformer Design Transformer Turns Ratio Transformer ET Constant Transformer Primary Inductance and Resistance Transformer Isolation Voltage Switching Frequency Transient Response Component Selection Printed Circuit Board (PCB) Layout Thermal Analysis Power Consumption Power Considerations Soft Start Mode and Current-Limit Protection Insulation Lifetime Outline Dimensions Ordering Guide