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PDF SF1533 Data sheet ( Hoja de datos )
| Número de pieza | SF1533 | |
| Descripción | PWM Power Switch | |
| Fabricantes | SiFirst Technology | |
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SF1533
η-BalanceTM PWM Power Switch Fixed 50KHz Fsw
FEATURES
◆ Built-in 600V Power MOSFET
◆ Proprietary η-BalanceTM Control to Boost
Light Load Efficiency
◆ Proprietary “Zero OCP/OPP Recovery Gap”
Control
◆ Fixed 50KHz 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
GENERAL DESCRIPTION
SF1533 is a high performance, high efficiency, highly
integrated current mode PWM power switch for
offline flyback converter applications.
In SF1533, PWM switching frequency with shuffling is
fixed to 50KHz and is trimmed to tight range. When
the output power demands decrease, the IC
decreases switching frequency based on the
proprietary η -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.
SF1533 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), VCC Clamping, Leading Edge
Blanking (LEB), etc.
SF1533 is available in SOP8 packages.
TYPICAL APPLICATION
AC IN
EMI
Filter
DC Out
SF1533
1 NC GND 8
2 VDD GND 7
3 FB
4 CS
Drain 6
Drain 5
©SiFirst Technology
-1-
TL431
Confidential
SiFirst_DS_1533_V1.1
1 page | ||
| Páginas | Total 2 Páginas | |
| PDF Descargar | [ Datasheet SF1533.PDF ] | |
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