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KA4976-AL Datenblatt(PDF) 8 Page - Analog Devices |
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KA4976-AL Datenblatt(HTML) 8 Page - Analog Devices |
8 / 20 page 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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Ähnliche Beschreibung - KA4976-AL |
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