11
30 Mute,
high
Level availability
0 35
VDD
5.00
31
I2C DATA
5.00
34
x T2
4.50
32
I2C CLOCK
5.00
33
x T1
2.70
KA5Q0565RT
Function introduction to pin
pin name
function
Reference
Voltage(V)
1
Drain
drain output of MOSFET, current-limiting checking point of
internal drain current.
283
2
GND
source of MOSFET,common ground and reference of circit
controlled by source.
0
3
Vcc
Control cicuit power input, provide starting and stabling
Operating current.
23
4
Vfb
Connect it with inverting input terminal of PWM comparator
,the collector of optical coupler can be connected to
it. To work stably , connect a capacitor between it and
the ground. If the voltage upon it reaches to 7.5V, the
overvoltage protection will work.
1.35
5
Sync
Connect it with sync detector for quasi-resonance vonversion.
Normal quasi-resonance work, threshold voltage upon sync
comparator is 4.6V/2.6V. while expanding quasi-resonance
operating mode, the threshold voltage will change to
3.0V/1.8V.
5.65
