SF5879 is a high performance, 2nd Generation Quasi-Resonant (QR-||TM) PWM controller for offline flyback power converter applications. The built-in proprietary QR-||TM technology with high level prote

SF5879

EPS Level 6

Easily Meet EPS Level 6
Proprietary QR-||TM Technology: Digital Anti-jitter for Audio Noise Free Operation, Digital Frequency Foldback, Digital Frequency Jittering for Better EMI
Proprietary HV-mWTM to Achieve Less than 50mW Standby Power
Multi-Mode Operation for High Efficiency
12.7us Maximum Duty Cycle.
80KHz Maximum On Time
53KHz Frequency Low Clamping in QR Mode
65% Maximum Duty Cycle
Adaptive Slope Compensation for CCM Mode
Built-in 600V Power MOSEFT
Constant power limiting

Application:

Offline AC/DC fly-back converter for

AC/DC adapters
Open-frame SMPS
Set-top box power supplies
ATX standby power

SF5879 is a high performance, 2nd Generation Quasi-Resonant (QR-||TM) PWM controller for offline flyback power converter applications. The built-in proprietary QR-||TM technology with high level protection features improves the SMPS reliability and performance.

In SF5879, the "Digital Anti-Jitter' function can automatically select and lock a valley at a given loading, which can achieve audio noise free operation. On the other hand, the "Digital Frequency Jittering" function makes the system have superior EMI performance than conventional QR system.

SF5879 is a multi mode controller. When full loadings, the IC works in CCM mode or QR mode based on the AC line input . When the loading goes low, the IC enters into "Digital Frequency Foldback" mode to boost power conversion efficiency. When the output power is very small, the IC enters into burst mode and can achieve less than 100mW no load power.

SF5879 integrates functions and protections of Under Voltage Lockout (UVLO), VCC Over Voltage Protection (OVP), Output Over Voltage Protection (Output OVP), cycle-by-cycle Current Limiting (OCP), pins Floating Protection, Over load Protection (OLP), Soft Start , VCC Clamping, Gate Clamping, In SF5879, the protection functions are auto-recovery mode protection.

SF5879 is available in DIP8 packages.

ID	型号	拓扑结构	驱动模式	HV-mW™	待机功耗	最大输出功率	六级能效	封装
21	SF5877	QR-\|\|™	External MOS	√	50mw	150w	√	SOP8
22	SF5879	QR-\|\|™	2A MOS Inside	√	30mw	15w	√	DIP8
23	SF5887	QR-\|\|™	External MOS	-	100mw	70w	√	SOP8
24	SF5897	QR-\|\|™	External MOS	-	300mw	150w	√	SOP8
25	SF5873	QR-\|\|™	External MOS	√	50mw	50w	√	SOP8
26	SF1539W	Flyback/n-Banlance™	2A MOS Inside	-	300mw	15w	-	DIP8
27	SF1548	Flyback/n-Banlance™	2A MOS Inside	-	300mw	15w	-	DIP8
28	SF1549	Flyback/n-Banlance™	4A MOS Inside	-	300mw	18w	-	DIP8
29	SF5588	Flyback/n-Banlance™	2A MOS inside	√	50mw	15w	-	DIP8
30	SF5539	Flyback/n-Banlance™	MOS inside	-	75mw	-	-	DIP8