Datasheet XDPL8218 (Infineon) - 10

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XDPL8218 Digital Flyback Controller IC XDP™ Digital Power Functional description On-time limits adaptation based on estimated input voltage
In
DCM
and
QRM1
, 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 up to the output overvoltage level parameter VoutOV via ZCD pin. N V t p outOV on, min, V, out, sense Vin = tmin, demag ⋅ N ⋅ s Vin,peak
Equation 2
In
DCM
and
QRM1
, the minimum on-time of ton,min(Vin) in
Figure 4
is based on ton,min parameter or ton,min,V,out,sense(Vin) variable, whichever is higher, as shown in
Figure 8
. ton > ton,min Vin = max ton,min,V,out,sense Vin , ton,min
Equation 3
In
DCM
and
QRM1
, for estimated input voltage Vin between lowest operational input voltage parameter Vin,low and input overvoltage protection level parameter VinOV, the maximum on-time of ton,max(Vin) in
Figure 4
is scaled to compensate the influence of input voltage on feedback gain, based on: V t in, low on < ton, max Vin = ton, max, at, V, in, low ⋅ Vin
Equation 4
Also, in
DCM
and
QRM1
, for estimated input voltage Vin below Vin,low, the maximum on-time of ton,max(Vin) in
Figure 4
is scaled based on the maximum on-time foldback gain parameter Pfoldback,gain, for power limitation during brown-out. V t in, low − Vin on < ton, max Vin = ton, max, at, V, in, low ⋅ 1 − Pfoldback, gain ⋅ Vin,low
Equation 5
ton,max(Vin) ton,min(Vin) ton,min,V,out,sense(Vin) t P on,max,at,V,in,low foldback,gain =0 Pfoldback,gain =1 Pfoldback,gain >1 ton,min 0 V V inUV Vin,low VinOV in
Figure 8 On-time limit adaptation based on estimated input voltage
Datasheet 10 Revision 1.0 2018-06-06 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 3.2 Configurable gate voltage rising slope at GD pin 3.3 Startup 3.4 Line synchronization 3.5 Input voltage and output voltage estimation 3.5.1 Output voltage estimation 3.5.2 Input voltage estimation 3.6 Power factor correction 3.7 Protection features 3.7.1 Primary MOSFET overcurrent protection 3.7.2 Output undervoltage protection 3.7.3 Output overvoltage protection 3.7.4 Transformer demagnetization time shortage protection 3.7.5 Minimum input voltage startup check and input undervoltage protection 3.7.6 Maximum input voltage startup check and input overvoltage protection 3.7.7 VCC undervoltage lockout 3.7.8 VCC undervoltage protection 3.7.9 VCC overvoltage protection 3.7.10 IC overtemperature protection 3.7.11 Other protections 3.7.12 Protection reactions 3.8 Debug mode 4 List of Parameters 5 Electrical Characteristics and Parameters 5.1 Package Characteristics 5.2 Absolute Maximum Ratings 5.3 Operating Conditions 5.4 DC Electrical Characteristics 6 Package Dimensions 7 References Revision History Glossary ABM CCM CRC CV DCM ECG EMI GUI IC LED OCP1 PC PF PFC QRM1 SSR THD UART USB UVLO Disclaimer