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Número de pieza | SF5922 | |
Descripción | High Precision Primary Side Regulation (PSR) CV/CC Power Switch | |
Fabricantes | SiFirst | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de SF5922 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
No Preview Available ! SF5922
High Precision Primary Side Regulation (PSR) CV/CC Power Switch
FEATURES
◆ Built-in 600V Power MOSFET
◆ Low Standby Power Under 30mW, Easily to
Pass Energy Star EPS2.0
◆ Primary Side Regulation (PSR) without TL431
and Opto-Coupler
◆ ± 5% Constant Current (CC) and Constant
Voltage (CV) Regulation at Universal AC Input
◆ Proprietary
Cable
Voltage
Drop
Compensation in CV Mode
◆ Compensate for Line Voltage Variation
◆ Compensate for Transformer Inductance
Tolerances
◆ Built-in Control Loop Compensation in CV
Mode
◆ All Pins Floating Protection
◆ PFM Control Eases EMI Design
◆ Cycle-by-Cycle Current Limiting
◆ Built-in Leading Edge Blanking (LEB)
◆ Built-in Soft Start
◆ Output Over Voltage Protection
◆ VDD OVP & Clamp
◆ VDD Under Voltage Lockout (UVLO)
APPLICATIONS
◆ Battery chargers for cellular phones, cordless
phones, PDA, digital cameras, etc
◆ Replaces linear transformer and RCC SMPS
◆ Small power adapter
◆ AC/DC LED lighting
TYPICAL APPLICATION
GENERAL DESCRIPTION
SF5922 is a high performance, highly integrated
DCM (Discontinuous Conduction Mode) Primary Side
Regulation (PSR) power switch for offline small
power converter applications.
SF5922 uses Pulse Frequency Modulation (PFM)
control to improve efficiency and eases system EMI
design. The IC dramatically lowers system cost by
eliminating the opto-coupler and secondary control
circuits. It also can provide very tight output voltage
regulation (CV), in addition to output current control
(CC) ideal for charging applications.
SF5922 has Error Amplifier (EA) CV with built-in loop
compensation network for CV control, which
eliminates external compensation circuitry. It has
built-in cable drop compensation function, which can
provide excellent CV performance. The IC also has
built-in soft start function to soften the stress on the
MOSFET during power on period. Under light load
conditions, the IC decreases switching frequency to
achieve excellent regulation and high efficiency, yet
meets the requirement for no-load consumption less
than 30mW.
SF5922 integrates functions and protections of Under
Voltage Lockout (UVLO), VDD Over Voltage
Protection (VDD OVP), Output Over Voltage
Protection (Output OVP), Soft Start, Cycle-by-cycle
Current Limiting (OCP), All Pins Floating Protection,
VDD Clamping.
SF5922 is available in SOP8 package.
AC IN
SF5922
1 VDD GND 8
2 NC GND 7
3 FB
4 CS
Drain 6
Drain 5
DC Out
©SiFirst Technology
www.sifirsttech.com
-1-
SiFirst_DOC_DS_5922_V1.0
1 page SF5922
Note 4. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other
conditions beyond those indicated in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Note 5. The device is not guaranteed to function outside its operating conditions.
Note 6. Guaranteed by design.
Note 7. These parameters, although guaranteed, are not 100% tested in production
CHARACTERIZATION PLOTS
©SiFirst Technology
www.sifirsttech.com
-5-
SiFirst_DOC_DS_5922_V1.0
5 Page |
Páginas | Total 9 Páginas | |
PDF Descargar | [ Datasheet SF5922.PDF ] |
Número de pieza | Descripción | Fabricantes |
SF5920 | CV/CC Controller | SiFirst |
SF5922 | High Precision Primary Side Regulation (PSR) CV/CC Power Switch | SiFirst |
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