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SF5879 Datasheet Preview

SF5879 Datasheet

PWM Power Switch

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SF5879
HV-mWTM2nd Generation Quasi-Resonant (QR-IITM ) PWM Power Switch
FEATURES
Meet EPS Level 6
Built-in 600V Power MOSFET
Proprietary QR-IITM Technology:
Digital Anti-jitter for Audio Noise Free
Operation
Digital Frequency Foldback
Digital Frequency Jittering
Proprietary HV-mWTM to Achieve Less than
80mW Standby Power
Multi-Mode Operation for High Efficiency
12.7us Maximum On Time
80KHz Maximum Frequency Limit
53KHz Frequency Low Clamping in QR Mode
Maximum 65% Duty Cycle
Adaptive Slope Compensation for CCM Mode
Built-in Soft Start Function
Built-in Synchronous Slope Compensation
Cycle-by-Cycle Current Limiting
Leading Edge Blanking (LEB)
Constant Power Limiting
VDD UVLO, OVP & Clamp
APPLICATIONS
Offline AC/DC Flyback Converter for
AC/DC Adaptors
SMPS Power Supply
GENERAL DESCRIPTION
SF5879 is a high performance, 2nd Generation Quasi-
Resonant (QR-IITM) PWM power switch for offline
flyback power converter applications. The built-in
proprietary HV-mWTM technology and QR-IITM
technology with high level protection features can
improve 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 80mW no load power.
SF5879 integrates functions and protections of Under
Voltage Lockout (UVLO), VDD Over Voltage
Protection (VDD OVP), Output Over Voltage
Protection (Output OVP), Cycle-by-cycle Current
Limiting (OCP), Pin Floating Protection, Over Load
Protection (OLP), Soft Start, VCC Clamping, etc. In
SF5879, the protections are auto-recovery mode.
SF5879 is available in DIP8 package.
TYPICAL APPLICATION
EMI
Filter
DC Out
SF5879
1 DEM VDD 8
2 FB VDD 7
3 GND Drain 6
4 CS Drain 5
©SiFirst Technology
-1-
TL431
Confidential
SiFirst_DS_5879_V1.0




SiFirst

SF5879 Datasheet Preview

SF5879 Datasheet

PWM Power Switch

No Preview Available !

Pin Configuration
DEM
FB
GND
CS
18
DIP8
27
36
45
VDD
VDD
Drain
Drain
SF5879
Ordering Information
Part Number
Top Mark
SF5879DP
SF5879DP
Package
DIP8
RoHs
Tape & Reel
Output Power Table(1)
Part Number
SF5879
230VAC ± 15%(2)
Adapter(3)
18W
85-265VAC
Adapter(3)
15W
Note 1. The Max. output power is limited by junction temperature
Note 2. 230VAC or 100/115VAC with doublers
Note 3. Typical continuous power in a non-ventilated enclosed adapter with sufficient drain pattern as a heat
sink at 50 oC ambient.
Marking Information
SF5879DP
Y WW
YWW: Year&Week code
Pin Description
Pin Num
1
2
3
4
5-6
7-8
Pin Name I/O Description
DEM I Transformer core demagnetization detection pin. This pin is also used for
output over voltage protection (OVP).
FB I Voltage feedback pin. The loop regulation is achieved by connecting a
photo-coupler to this pin. PWM duty cycle is generated by this pin voltage
and the current sense signal at Pin 4.
GND P IC ground pin.
CS I Current sense input pin.
Drain P High voltage power MOSFET drain connection. This pin is also used for
high voltage startup.
VDD
P IC power supply pin.
©SiFirst Technology
- 2 - Confidential
SiFirst_DS_5879_V1.0


Part Number SF5879
Description PWM Power Switch
Maker SiFirst
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SF5879 Datasheet PDF






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