Evaluation Board SY5802FAC_3
Single Stage Flyback And PFC Controller
With Primary Side Control For LED Dimming
DB_SY5802FAC_3 Rev. 0.1 Silergy Corp. Confidential- Prepared for Customer Use Only
1
1. Introduction
The SY5802 is a single stage Flyback and PFC controller targeting at LED dimming applications. It is a
primary side controller without applying any secondary feedback circuit for low cost, and drives the Flyback
converter in the quasi-resonant mode to achieve higher efficiency. It keeps the Flyback converter in constant
on time operation to achieve high power factor.
2. Application
Provide
9W~12W output power and high power factor. It is compatible with 7 kinds of operation mode: No dimming,
Variable Resistor (VR) dimming (primary/secondary), 0-10V dimming (primary/secondary), PWM signal dimming
(primary/secondary)
3. Design Specifications
Item
Min Typical Max
Note
Input Voltage(V)
90
100-240
264
Output
Voltage (V)
Current(mA)
Power(W)
30
36
300
10.8W
44
PF
(110Vac
，
full load)
(220Vac
，
full load)
>0.90
0.99
0.95
Efficiency
（
110Vac
，
full load
）
（
220Vac
，
full load
）
>84%
86.7%
86.4%
condition
Working temperature
-20
℃
75
℃
Dimming range
10%
100%
When dimming operation
Standby Power
0.33W
0.4W
0.5W
Vary with operation mode
