SF5533 SF5533LGT Current Mode PWM Controller IC SOT23-6 for offline flyback converter applications
SF5533 Current Mode PWM Controller IC SOT23-6 SF5533LGT for offline flyback converter applications
Application:
Offline AC/DC Flyback Converter for
AC/DC Adaptors
Open-frame SMPS
Laptop Charger
Description:
SF5533 is a high performance, high efficiency, highly integrated current mode PWM controller for offline flyback converter applications.
The OLP debounce time can be programmed in SF5533.
In SF5533, PWM switching frequency with shuffling is fixed 65KHz and is trimmed to tight range.
When the output power demands decrease, the IC decreases switching frequency based on the proprietary
-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 can achieve less than 75mW no load power.
The IC can achieve “Zero OCP/OPP Recovery Gap” using SiFirst’s proprietary control algorithm. SF5533 also has built in proprietary
“Audio Noise Free OCP Compensation”, which can achieve constant power limiting and can achieve audio noise operation at heavy loading when line input is around 90VAC.
SF5533 integrates functions and protections of Under Voltage Lockout (UVLO), VDD Over Voltage Protection (OVP), Cycle-by-cycle Current Limiting (OCP), Pins Floating Protection, Over Load Protection (OLP), Gate Clamping, RT Pin Short-to-GND Protection, Leading Edge Blanking (LEB), Soft Start, etc.
SF5533 is available in SOT23-6 package.
Specification:
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Category
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Integrated Circuits (ICs)
|
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PWM Controller IC
|
|
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Mfr
|
Sifirst |
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Series #
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SF5533LGT
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Package
|
REEL
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Mounting Type
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Surface Mount
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Package / Case
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SOT-23-6 |
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Base Product Number
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SS5533 |
Features:
Less than 75mW Standby Power
Programmable OLP Debounce Time
Proprietary η-BalanceTM Control to Boost Light Load Efficiency
Proprietary “Zero OCP/OPP Recovery Gap” Control
Proprietary “Audio Noise Free OCP Compensation”
Dmax up to 80%
Fixed 65KHz Switching Frequency
Built-in Frequency Shuffling
Built-in Soft Start Function
Frequency Reduction and Burst Mode Control for Energy Saving
Built-in Synchronous Slope Compensation
Cycle-by-Cycle Current Limiting
Built-in Leading Edge Blanking (LEB)
Current Mode Control
Pin Floating Protection
Very Low Startup Current
Audio Noise Free Operation
VDD UVLO, OVP
Environmental & Export Classifications
| ATTRIBUTE | DESCRIPTION |
|---|---|
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) |
| REACH Status | REACH Affected |
| ECCN | EAR99 |
| HTSUS | 8542.39.0001 |
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