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SF1530 データシート(PDF) 1 Page - SIFIRST TECHNOLOGIES NANHAI LIMITED

部品番号 SF1530
部品情報  High Performance Current Mode PWM Controller
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メーカー  SIFIRST [SIFIRST TECHNOLOGIES NANHAI LIMITED]
ホームページ  http://www.sifirsttech.com/en/
Logo SIFIRST - SIFIRST TECHNOLOGIES NANHAI LIMITED

SF1530 データシート(HTML) 1 Page - SIFIRST TECHNOLOGIES NANHAI LIMITED

  SF1530 Datasheet HTML 1Page - SIFIRST TECHNOLOGIES NANHAI LIMITED SF1530 Datasheet HTML 2Page - SIFIRST TECHNOLOGIES NANHAI LIMITED  
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©SiFirst Technology
- 1 -
Confidential
SiFirst_DS_1530_V1.2
SF1530
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 Slope Compensation
◆ 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)
APPLICATIONS
Offline AC/DC Flyback Converter for
◆ AC/DC Adaptors
◆ Open-frame SMPS
◆ Set-Top Box Power Supplies
◆ ATX Standby Power
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.
TYPICAL APPLICATION
AC IN
RT
VDD
2
GATE
GND
FB
SF1530
DC Out
CS
3
1
5
4
6
TL431
High Performance Current Mode PWM Controller


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