DatasheetGeneral Description SF1539HT is a
high performance, high efficiency, highly
integrated current mode PWM power switch for offline flyback
converter applications. In SF1539HT, PWM
switching frequency
with shuffling is fixed to 65KHz
and is trimmed to tight range.
When the output power demands
decrease, he IC decreases switching
frequency based on the proprietaryη
-BalanceTM control to boost power
conversion efficiency at the light load.
When output power falls below a
given value, 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. SF1539HT integrates
functions and protections of Under
Voltage Lockout (UVLO), Over
Temperature Protection (OTP), VCC Over
Voltage Protection (OVP), Cycle-by-cycle
Current Limiting (OCP), Pins Floating
Protection, Over Load Protection
(OLP), VCC Clamping, Leading Edge Blanking (LEB), etc.SF1539HT is
available in DIP8 packages. Features Built-in 600V Power
MOSFET Over Temperature Protection (OTP)
Proprietary η -BalanceTM Control to Boost
Light Load Efficiency Proprietary "Zero OCP/OPP
Recovery Gap Control Fixed 65KHz Switching
Frequency Built-in Soft Start Function Very Low Startup
Current 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 Built-in Leading Edge
Blanking (LEB) Constant Power Limiting Pins
Floating Protection Audio Noise Free
Operation VDD OVP & Clamp VDD Under Voltage
Lockout (UVLO)Applications Offline AC/DC Flyback Converter
for AC/DC Adaptors Open-frame SMPS
Set-Top Box Power Supplies ATX Standby
Power Package/Order Information Typical CircuitWhy choose
us?* Specilaze in IC for around 14 years * 100% Tested before
sale * Cooperate with over 35 famous brands from domestic and
international market * Competitive and reasonable price *
Abundant inventory and short lead time * 24hrs supports from our
sales and R&D team Warranty1 YearLead time3-7
DaysNotes1.The pictures are taken by camera. 2.You can contact us
for a better price. 3.Feel free to contact us if you would like to
see other models. Our company /* January 22, 2024 19:08:37
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