Datasheet XDPL8210 (Infineon) - 8

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XDPL8210 Digital Flyback Controller IC XDP™ Digital Power Functional description 3 Functional description
The functional description provides an overview about the integrated functions and features as well as their relationship. The mentioned parameters and equations are based on typical values at TA = 25°C. The corresponding min. and max. values are shown in the electrical characteristics.
3.1 Regulated mode
The XDPL8210 regulated mode provides a primary side control of the output current. The secondary side feedback components are not necessary for the output current control as the primary side regulation control loop is fully integrated.
3.1.1 Constant current and limited power set-point
Under non-dimming condition, the regulated mode
CC
output current set-point is based on the maximum output current set-point Iout,full. Under dimming condition, the regulated mode
CC
output current set-point is selected between Iout,full and minimum output current set-point Iout,min, depending on the dimming level. Both Iout,min and Iout,full parameters are configurable. If the output power produced by the regulated mode
CC
output current set-point and the connected LED voltage VLED exceeds the configurable maximum output power limit set-point Pout,set, the regulated mode
LP
set point based on Pout,set parameter would take over and reduce the output current set-point to Pout,set / VLED. To achieve a full
CC
output dimming range between Iout,min and Iout,full, the connected LED voltage VLED should not exceed Pout,set / Iout,full, as shown in
Figure 5
. If only the
CC
regulation is desired, the
LP
regulation can be disabled by configuring Pout,set = 0. Iout set-point Pout,set Iout,full Pout,set / VLED,max Iout,min LED voltage Output VLED,min,dimmed Pout,set VLED,max Output UVP Iout,full OVP
Figure 5 Operating window with constant current and limited power regulation
Note: VLED,max refers to the desired maximum operating LED voltage when output current is Iout,full. VLED,max should be designed well below the output overvoltage protection level. Note: VLED,min,dimmed refers to the desired minimum operating LED voltage when output current is Iout,min. VLED,min,dimmed should be designed well above the output undervoltage protection level. Datasheet 8 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