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AS1383 Datasheet(PDF) 9 Page - ams AG |
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AS1383 Datasheet(HTML) 9 Page - ams AG |
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9 / 22 page  ams Datasheet Page 9 [v1-01] 2015-May-22 Document Feedback AS1383 − Detailed Descriptions Thermal Overload Protection To prevent the AS1383 from short-term misuse the chip includes a thermal overload protection. To block the normal operation the switching of PMOS and NMOS are stopped during the thermal protection, but the VOUT follows the VBAT. The device is in thermal shutdown when the junction temperature exceeds 150°C. To resume the normal operation the temperature has to drop below 140°C. Note(s): Continuing operation in thermal overload conditions may damage the device and is considered bad practice. VOUT Programming with External Resistor Divider In adjustable VOUT variant AS1383 output voltage can be selected with external resistor diver connected to the FB pin as shown in Figure 3. In this case, the VOUT follows the function: In fixed output voltage variant the VOUT is programmed internally, and the VOUT if connected directly to FB pin. A higher resistance of R1 and R2 will result in a lower leakage current. Resistance between 10kΩ and 500kΩ is recommended for R2. It is recommended to keep VIN 500mV higher than VOUT. (EQ1) VOUT 1 R1 R2 ------ + 1.25V ⋅ = |
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