link to page 47 link to page 47 link to page 47 XDPL8210 Digital Flyback Controller ICXDP™ Digital PowerFunctional description VGD time ton VAUX tsw,DCM 0 V time Figure 8Switching waveforms in DCM • ABM : This mode can be enabled with ENABM parameter to deliver a lower output power than in DCM , for a lower minimum output current. The on-time and switching frequency are kept at the minimum value, while the power is controlled by regulating the switching pulse number of each burst period. The burst frequency in this mode is synchronized to the rectified AC input frequency, to ensure good light quality and low audible noise. The minimum power transfer in ABM Pmin,ABM happens when the minimum switching pulse number NABM,min is reached. Minimum on-time adaptation based on estimated input voltage In all switching modes, ton,min,V,out,sense(Vin) variable is scaled to allow a desired minimum transformer demagnetization time based on tmin,demag parameter at the peak of input voltage Vin,peak, for output voltage sensing. ton,min,V,out,sense Vin = tmin,demag ⋅ Np N ⋅ Vout s Vin, peak Equation 1 The minimum on-time of ton,min(Vin) is based on ton,min parameter or ton,min,V,out,sense(Vin) variable, whichever is higher. ton > ton,min Vin = max ton,min,V,out,sense Vin , ton,min Equation 2 Datasheet 10 Revision 1.0 2019-04-26 Document Outline Features Product validation Potential applications Description Table of contents 1 Pin configuration 2 Functional block diagram 3 Functional description 3.1 Regulated mode 3.1.1 Constant current and limited power set-point 3.1.2 Multimode operation 3.1.3 Control loop initialization 3.2 Configurable gate voltage rising slope at GD pin 3.3 Startup 3.4 Line synchronization 3.5 Input voltage, output voltage and output current estimation 3.5.1 Input voltage estimation 3.5.2 Output voltage estimation 3.5.3 Output current estimation 3.6 Power factor correction 3.7 Dimming control 3.8 Protection features 3.8.1 Primary MOSFET overcurrent protection 3.8.2 Output undervoltage protection 3.8.3 Output overvoltage protection 3.8.4 Transformer demagnetization time shortage protection 3.8.5 Regulated mode peak output overcurrent protection 3.8.6 Minimum input voltage startup check and input undervoltage protection 3.8.7 Maximum input voltage startup check and input overvoltage protection 3.8.8 VCC undervoltage lockout 3.8.9 VCC overvoltage protection 3.8.10 IC overtemperature protection 3.8.11 Other protections 3.8.12 Protection reactions 4 Debug mode 5 List of Parameters 6 Electrical Characteristics and Parameters 6.1 Package Characteristics 6.2 Absolute Maximum Ratings 6.3 Operating conditions 6.4 DC Electrical characteristics 7 Package Dimensions 8 References Revision History Glossary ABM CC CRC DCM ECG EMI FB GUI IC LED LP MCU PC PF PFC PWM QRM1 THD UART USB UVLO Disclaimer
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