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SK13 Datasheet(PDF) 9 Page - Diodes Incorporated |
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SK13 Datasheet(HTML) 9 Page - Diodes Incorporated |
9 / 14 page AP65101 Document number: DS38098 Rev. 2 - 3 9 of 14 www.diodes.com December 2016 © Diodes Incorporated AP65101 NOT RECOMMENDED FOR NEW DESIGN Application Information (Cont.) Current Limit and Hiccup Protection In order to reduce the total power dissipation and to protect the application, AP65101 has cycle-by-cycle current-limiting implementation. The voltage drop across the internal high-side MOSFET is sensed and compared with the internally set current-limit threshold. This voltage drop is sensed at about 30ns after the HS turns on. When the peak inductor current exceeds the set current limit threshold, current limit protection is activated. When the voltage at the FB pin reaches 0.2V the device enters Hiccup mode to periodically restart the part. This protection mode greatly reduces the power dissipated on chip and reduces the thermal issue to protect the device. AP65101 will exit Hiccup mode when the over current situation is resolved. Under Voltage Lockout (UVLO) Under voltage Lockout is implemented to prevent the IC from insufficient input voltages. The AP65101 has a UVLO comparator that monitors the input voltage and the internal bandgap reference. If the input voltage falls below 4.4V, the AP65101 will latch the undervoltage fault. In this event, the output will be pulled low and power has to be re-cycled to reset the UVLO fault. Overvoltage Protection When the AP65101 FB pin exceeds 115% of the nominal regulation voltage of 0.8V, the overvoltage comparator is tripped. Thermal Shutdown The AP65101 has on-chip thermal protection that prevents damage to the IC when the die temperature exceeds safe margins. It implements a thermal sensing to monitor the operating junction temperature of the IC. Once the die temperature rises to approximately +160°C, the thermal protection feature gets activated. The internal thermal sense circuitry turns the IC off thus preventing the power switch from damage. A hysteresis in the thermal sense circuit allows the device to cool down to approximately +120°C before the IC is enabled again through soft start. This thermal hysteresis feature prevents undesirable oscillations of the thermal protection circuit. Setting the Output Voltage The output voltage can be adjusted using an external resistor divider. Table 1 shows a list of resistor selection for common output voltages. Resistor R1 is selected based on a design tradeoff between efficiency and output voltage accuracy. For high values of R1 there is less current consumption in the feedback network. R1 can be determined by the following equation: 1 0.8 V R R OUT 2 1 FB R1 R2 VOUT RT Figure 2. Feedback Divider Network Table 1. Recommended Component Selection VOUT (V) R1 (kΩ) R2 (kΩ) RT (kΩ) L1 (µH) 1.05 10 32.4 150 2.2 1.2 20.5 41.2 130 2.2 1.8 40.2 32.4 100 3.3 2.5 40.2 19.1 59 4.7 3.3 40.2 13 59 6.5 5 40.2 7.68 59 6.5 |
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