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SF5773S Datasheet Preview

SF5773S Datasheet

PWM Controller

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SF5773S
2nd Generation Quasi-Resonant (QR-IITM ) PWM Controller with Brownout Protection
FEATURES
Easily Meet EPS Level 6
AC Brownout Protection (BOP)
Proprietary QR-IITM Technology:
Digital Anti-jitter for Audio Noise Free
Operation
Digital Frequency Foldback
Digital Frequency Jittering for Better EMI
Less than 100mW Standby Power
Multi-Mode Operation for High Efficiency
12.7us Maximum On Time
80KHz Maximum Frequency Limit
52KHz Frequency Low Clamping in QR Mode
65% Maximum Duty Cycle
Adaptive Slope Compensation for CCM Mode
Built-in Soft Start Function
Pin Floating Protection
Built-in Synchronous Slope Compensation
Cycle-by-Cycle Current Limiting
Leading Edge Blanking (LEB)
Constant Power Limiting
VDD UVLO, OVP & Clamp
APPLICATIONS
Offline AC/DC Flyback Converter for
AC/DC Adaptors
SMPS Power Supply
GENERAL DESCRIPTION
SF5773S is a high performance, 2nd Generation
Quasi-Resonant (QR-IITM) PWM controller for offline
flyback power converter applications. The built-in
proprietary QR-IITM technology with high level
protection features improves the SMPS reliability and
performance.
In SF5773S, the “Digital Anti-Jitter” function can
automatically select and lock a valley at a given
loading, which can achieve audio noise free
operation. On the other hand, the “Digital Frequency
Jittering” function makes the system have superior
EMI performance than conventional QR system.
SF5773S is a multi mode controller. When full
loadings, the IC works in CCM mode or QR mode
based on the AC line input. When the loading goes
low, the IC enters into “Digital Frequency Foldback
mode to boost power conversion efficiency. When the
output power is very small, the IC enters into burst
mode and can achieve less than 100mW no load
power.
SF5773S integrates functions and protections of
Under Voltage Lockout (UVLO), VCC Over Voltage
Protection (OVP), Output Over Voltage Protection
(Output OVP), Cycle-by-cycle Current Limiting (OCP),
Pin Floating Protection, Over Load Protection (OLP),
AC Brownout Protection, Soft Start, VCC Clamping,
Gate Clamping, etc. In SF5773S, the protection
functions are auto-recovery mode protection.
SF5773S is available in SOT23-6 package.
TYPICAL APPLICATION
AC IN
EMI
Filter
DC Out
SF5773S
1 GND GATE 6
2 FB
3 DEM
VDD 5
CS 4
©SiFirst Technology
-1-
TL431
Confidential
SiFirst_DS_5773S_V1.0




SiFirst

SF5773S Datasheet Preview

SF5773S Datasheet

PWM Controller

No Preview Available !

Pin Configuration
GND
FB
DEM
16
SOT23-6
25
34
GATE
VDD
CS
SF5773S
Ordering Information
Part Number
Top Mark
SF5773SLGT
.73SYW
Marking Information
Package
SOT26
Green
Tape & Reel
Yes
73SYW
Dot: Pin1 Mark
73S:Part number SF5773S
YW: Year&Week Code
Pin Description
Pin Num
1
2
3
4
5
6
Pin Name I/O Description
GND
P IC ground pin.
FB I Voltage feedback pin. The loop regulation is achieved by connecting a
photo-coupler to this pin. PWM duty cycle is generated by this pin voltage
and the current sense signal at Pin 4.
DEM I Transformer core demagnetization detection pin. This pin is also used for
output over voltage protection (Output OVP) and AC Brownout Protection
(BOP).
CS I Current sense input pin.
VDD
P IC power supply pin.
GATE O Totem-pole gate driver output to drive the external MOSFET.
©SiFirst Technology
- 2 - Confidential
SiFirst_DS_5773S_V1.0


Part Number SF5773S
Description PWM Controller
Maker SiFirst
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SF5773S Datasheet PDF






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