link to page 31 link to page 18 Forced Frequency Resonant Flyback controllerFunctional Description VVCC(t) Initial startup and normal operation VVCCon = 20.5 V
VCC brown-in window
VVCCSS VVCCBI = 9.1 V
VCC self supply takes over VVCCoffOP = 7.2 V
t VHV(t)
ca. 1.2ms internal boot sequence VVACpeak
VAC brown-in condition fulfil ed
t I
VCC(t) Start of GD0 switching IVCCop
IVCCop1 = 7.5 mA
IVCCUVOFF = 30 µA t
TYPICAL STARTUP SEQUENCE Figure 4Typical startup sequence4.1.2Brown-in monitoring Once the IC is activated, brown-in monitoring is enabled for input brown-in protection (see Chapter 4.3.4) by measuring the current at HV pin through the internal shunt resistor RM (see Chapter 4.2.2). If the input brown-in is not detected before VCC falls below VVCCBI, the startup cell measurement unit remains enabled until VCC falls down to VVCCoff. Data Sheet 8 Revision 2.0 2019-10-30