SFL320SG [SIFIRST]
High Power Factor Flyback PWM Controller;
| 型号： | SFL320SG |
| 厂家： | 
SIFIRST |
| 描述： | High Power Factor Flyback PWM Controller |
| 文件： | 总2页 (文件大小：57K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SFL320
High Power Factor Flyback PWM Controller
FEATURES
GENERAL DESCRIPTION
SFL320 is a high power factor flyback PWM
controller special for LED lighting applications. The IC
adopts transition mode (TM) operation for high
efficiency and low EMI.
◆ Built-in Soft Start
◆ Very Low Startup Current
◆ Under Voltage Lockout with 7.7V Hysteresis
◆ VCC Over Voltage Protection (OVP)
◆ Clear External EA Feedback Network before
Power On
◆ Transition Mode (TM) Operation
◆ Highly Linear Analog Multiplier
◆ Proprietary “Frequency Adjusting” for Higher
PF and Low THD
SFL320 will Clear External EA Feedback Network
before IC power on. The IC also has Soft Start
control to soften the stress on the MOSFET during
power on period.
In SFL320, a highly linear analog multiplier is
integrated to achieve low THD and high power factor.
The zero current detector (ZCD) ensures TM
operation. A restart timer is for and alone
applications. The IC also has the funon of Min.
OFF time and Max. Frequency Clamp to limits
power MOS Vds spike when LED output is short.
In SFL320, the proprietary “Frequency Adjusting”
can help to improve THD performance, while ensures
audio noise free operation. A VCC Over Voltage
Protection (VCC VP) is integrated to improve
system reliability.
◆ 3.3us Min. OFF Time
◆ 270KHz Max Frequency Clamp
◆ Trimmed 1.5% Internal Voltage Reference
◆ Restart Timer for Stand-alone Applications
◆ Cycle-by-Cycle Current Limiting
◆ Built-in Leading Edge Blanking (LEB)
◆ Audio Noise Free Operation
◆ 10V to 32V Wide Range of VCC Voltage
◆ 800mA Drive Capability
SFL320 integrfunctions and protections of Under
Voltage Lock(UVLO), VCC Over Voltage
Protection (OVP), Soft Start Control, Cycle-by-cycle
Current Limiting (OCP), GD Clamping, VCC
Clamping, Leading Edge Blanking (LEB), etc.
In SFL320, VCC OVP is auto-recovery mode
protection.
APPLICATIONS
◆ LED Lighting Application
◆ Single Stage High PF Flyback AC/DC SMPS
SFL320 is available in SOP-8 and DIP-8 packages.
TYPICAL APPLICATION
EMI
Filter
VCC
MULT
FB
GATE
ZCD
CS
GND
COMP
SFL100
©SiFirst Technology
- 1 -
Confidential
SiFirst_DS_320_V1.2
SFL320
Pin Configuration
VCC
GD
1
2
3
4
8
7
6
5
FB
COMP
MULT
CS
DIP8/
SOP8
GND
ZCD
Ordering Information
Part Number
SFL320SG
Top Mark
SFL320SG
SFL320SG
SFL320DP
Package
Tape & Reel
SOP8
SOP8
DIP8
Green
Green
RHS
SFL320SGT
SFL320DP
Yes
Marking Information
YWW: Year&Week code
YWW: Year&Week code
©SiFirst Technology
- 2 -
Confidential
SiFirst_DS_320_V1.2
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