High Performance Current Mode PWM Controller
Product：SF1530
1、GENERAL DESCRIPTION
SF1530 is a high performance,low cost,highly integrated current mode PWM controller for offline flyback converter applications.PWM switching frequency with shuffling is externally programmable,which can reduce conduction EMI emission of a power supply. When the output power demands decrease, the IC automatically decreases switching frequency for high power conversion efficiency.When the current set-point falls below a given value, e.g. the output power demand diminishes,the IC enters into burst mode and provides excellent efficiency without audio noise. The IC can achieve “Zero OCP/OPP Recovery Gap”using
SiFirst’s proprietary control algorithm. Meanwhile,the OCP/OPP variation versus universal line input is compensated.The IC has built-in synchronized slope compensation to prevent sub-harmonic oscillation at high PWM duty output.The IC also has built-in soft start function to soften the stress on the MOSFET during power on period.SF1530 integrates functions and protections of Under Voltage Lockout (UVLO),VCC Over Voltage Protection (OVP),Cycle-by-cycle Current Limiting (OCP),Pins Floating Protection,Over Load Protection (OLP),RT Pin Short-to-GND Protection, Gate Clamping,VCC Clamping,Leading Edge Blanking (LEB).SF1530 is available in SOT23-6, DIP-8 packages.
2、 Features
Proprietary “Zero OCP/OPP Recovery Gap”Control
Built-in Soft Start Function
Pins Floating Protection
Very Low Startup Current
High Voltage CMOS Process with Excellent ESD Protection
Frequency Reduction and Burst Mode Control for Energy Saving
Current Mode Control
Built-in Frequency Shuffling
Programmable Switching Frequency
Built-in Synchronous Synchronous Slope Compentation
Cycle-by-Cycle Current Limiting
Built-in Leading Edge Blanking(LEB)
Constant Power Limiting
Audio Noise Free Operation
VDD OVP& Clamp
VDD Under Voltage Lockout(UVLO)
3、Applications
Offline AC/DC Flyback Converter for
AC/DC Adaptors
Open-frame SMPS
Set-Top Box Power Supplies
ATX Standby Power
4、TYPICAL APPLICATION

5、Pin Configuration


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