Datasheet XDPS21071 (Infineon) - 9

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Forced Frequency Resonant Flyback controller Functional Description
VBULK
V AC = 85 ... 264 Vrms
CBulk RHV = 100kW CVCC VCC HV
HV Startup- cell
Closed/Open
Startup-Cell Driver
D1
Brown-in & Brown-out
QM
Protection
I & HVBI = 1.15 mA
PWM
IHVBO = 0.442mA
Logic
RM
VCC Brown-in Protection Power Supply
V
Management
VCCBI = 9.1 V
UVLO
VVCCon = 20.5 V
HW Reset
VVCCoffx = 7.2 V / 9.6 V
Figure 5 High voltage brown-in sensing and VCC startup at HV pin 4.1.3 Brown-out protection response
In case of brown-out (see Chapter 4.3.5), the IC stops gate driver switching and stays active. At the same time, the VCC turn- off threshold is switched over from VVCCoff to the threshold VVCCoffBO = 9.6 V. The threshold VVCCoffBO is higher than the threshold VVCCoff, which supports an earlier system restart than using the threshold VVCCoff.
4.1.4 During burst mode operation
After the control IC enters quiet burst mode, the IC enters repeatedly a sleep mode, in which the IC current consumption is reduced to IVCCquBM2 = 460 µA. Waking up from and entering this sleep mode (pause) is controlled by the feedback voltage at MFIO pin VMFIO via the internal comparators C5 and C6 (see Figure 6 and Chapter 4.2.910). Data Sheet 9 Revision 2.0 2019-10-30