SF5590
HV-mWTM、η-BalanceTM PWM Controller Programmable Fsw
FEATURES
GENERAL DESCRIPTION
SF5590 is a high performance, highly integrated
current mode PWM controller for medium to large
offline flyback power converter applications.
◆ Programmable Switching Frequency
◆ Proprietary HV-mWTM to Achieve Less than
50mW Standby Power
In SF5590, 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
decreases switching frequency based on the
◆ Proprietary η-BalanceTM Control to Boost
Light Load Efficiency
◆ Proprietary “Zero OCP/OPP Recovery Gap”
Control
◆ Proprietary
Compensation”
◆ Built-in Soft Start Function
◆ Pin Floating Protection
◆ Frequency Reduction and Burst Mode Control
for Energy Saving
◆ Current Mode Control
◆ Built-in Frequency Shuffling
◆ Built-in Synchronous Slope Compensation
◆ Cycle-by-Cycle Current Limiting
◆ Leading Edge Blanking (LEB)
◆ Constant Power Limiting
“Audio
Noise
Free
OCP
proprietaryη-BalanceTM control to boost power
conversion efficiency at the light load. SF5590 also
integrates proprietary HV-mWTM technology to
achieve less than 50mW standby power.
SF5590 can achieve “Zero OCP/OPP Recovery
Gap” using SiFirst’s proprietary control algorithm.
SF5590 also has built in proprietary “Audio Noise
Free OCP Compensation”, which can achieve
constant power limiting and can achieve audio noise
operation at heavy loading when line input is 90VAC.
SF5590 integrates functions and protections of Under
Voltage Lockout (UVLO), VDD Over Voltage
Protection (OVP), Cycle-by-cycle Current Limiting
(OCP), Pin Floating Protection, Over Load Protection
(OLP), Soft Start, Gate Clamping, VDD Clamping, etc.
In SF5590, the protection functions are auto-recovery
mode protection.
◆ VDD OVP & Clamp
◆ VDD Under Voltage Lockout (UVLO)
APPLICATIONS
Offline AC/DC Flyback Converter for
◆ AC/DC Adaptors
SF5590 is available in SOP8 and DIP8 packages.
◆ Open-frame SMPS
◆ Print Power, Scanners, and Motor Drivers
TYPICAL APPLICATION
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SiFirst_DS_5590_V1.2