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Part Name(s) : OB2211CP OB2211CPA OB2212AP On-Bright
On-Bright Electronics
Description : Primary-Side Regulation PWM Power Switch View

GENERAL DESCRIPTION

OB2211/OB2212 is an offline PWM Power Switch for low Power AC/DC charger and adaptor applications. It operates in Primary-Side sensing and Regulation. Consequently, opto-coupler and TL431 could be eliminated from design. Proprietary Constant Voltage (CV) and Constant Current (CC) control is integrated as shown in the figure below.


Part Name(s) : FSEZ1307 FSEZ1307MY Fairchild
Fairchild Semiconductor
Description : Primary-Side-Regulation PWM with Power MOSFET Integrated View

Description

This third-generation Primary Side Regulation (PSR) PWM  controller combination Power MOSFET,

FSEZ1307, provides several features to enhance the performance of low-Power flyback converters. The proprietary topology,  TRUECURRENT™, enables precise CC Regulation and simplified circuit design for battery-charger applications. Compared to a conventional design or a linear transformer, a low-cost, smaller, and lighter charger results.



Features

Low Standby Power: Under 30mW

High-Voltage Startup

Few External Components

Constant-Voltage (CV) and Constant-Current (CC) Control without Secondary-Feedback Circuitry

Green Mode: Linearly Decreasing PWM Frequency

Fixed PWM Frequency at 50kHz with Frequency Hopping to Solve EMI Problem

Cable Compensation in CV Mode

Peak-Current-Mode Control in CV Mode

Cycle-by-Cycle Current Limiting

VDD Over-Voltage Protection with Auto Restart

VDD Under-Voltage Lockout (UVLO)

Gate Output Maximum Voltage Clamped at 15V

Fixed Over-Temperature Protection with Auto Restart

Available in 7-Lead SOP Package


Part Name(s) : FAN103 FAN103MY FAN103WMY Fairchild
Fairchild Semiconductor
Description : Primary-Side-Regulation PWM Controller (PWM-PSR) View

Description

This third-generation Primary-Side-Regulation (PSR) and highly integrated PWM controller provides several features to enhance the performance of low-Power flyback converters. The proprietary topology, TURECURRENT™, of FAN103 enables precise CC Regulation and simplified circuit for battery charger applications. A low-cost, smaller and lighter charger results as compared to a conventional design or a linear transformer.



Features

Low Standby Power Under 30mW

High Voltage Startup

Fewest External Component Counts

Constant-Voltage (CV) and Constant-Current (CC) Control without Secondary-Feedback Circuitry

Green-Mode Function: Linearly-Decreasing PWM Frequency

Fixed PWM Frequency at 50kHz with Frequency Hopping to Solve EMI Problem

Cable Compensation in CV Mode

Peak-Current-Mode Control in CV Mode

Cycle-by-Cycle Current Limiting

VDD Over-Voltage Protection with Auto Restart

VDD Under-Voltage Lockout (UVLO)

Gate Output Maximum Voltage Clamped at 15V

Fixed Over-Temperature Protection with Auto Restart

Available in the 8-Lead SOP Package



Applications

Battery chargers for cellular phones, cordless phones, PDA, digital cameras, Power tools, etc.

Replaces linear transformer and RCC SMPS


Part Name(s) : FSEZ1317A FSEZ1317AMY_F116 Fairchild
Fairchild Semiconductor
Description : Primary-Side-Regulation PWM with Power MOSFET Integrated View

Description

This third-generation Primary-Side-Regulation (PSR) and highly integrated PWM controller provides several features to enhance the performance of low-Power flyback converters. The proprietary topology, TRUECURRENT® , of FSEZ1317A enables precise CC Regulation and simplified circuit design for battery charger applications. A low-cost, smaller, and lighter charger results, as compared to a conventional design or a linear transformer.



Features

Low Standby Power Under 30mW

High-Voltage Startup

Fewest External Component Counts

Constant-Voltage (CV) and Constant-Current (CC Control without Secondary-Feedback Circuitry

Green-Mode: Linearly Decreasing PWM Frequenc

Fixed PWM Frequency at 50kHz with Frequency Hopping to Solve EMI Problem

Cable Compensation in CV Mode

Peak-Current-Mode Control in CV Mode

Cycle-by-Cycle Current Limiting

VDD Over-Voltage Protection with Auto Restart

VDD Under-Voltage Lockout (UVLO)

Gate Output Maximum Voltage Clamped at 15V

Fixed Over-Temperature Protection with Auto Restart

Available in the 7-Lead SOP Package



Applications

Battery chargers for cellular phones, cordless phones, PDA, digital cameras, Power tools, etc.

Replaces linear transformers and RCC SMPS



Part Name(s) : FSEZ1016A FSEZ1016AMY FSEZ1016A FSEZ1016AMY Fairchild
Fairchild Semiconductor
Description : Primary-Side-Regulation PWM Integrated Power MOSFET View

Description
This Primary-Side PWM integrated Power MOSFET significantly simplifies Power supply designs that require CV and CC Regulation capabilities. FSEZ1016A controls the output voltage and current precisely with only the information in the primary side of the Power supply, not only removing the output current sensing loss, but also eliminating all secondary feedback circuitry.
The green-mode function with a low startup current (10µA) maximizes the light-load efficiency so the Power supply can meet stringent standby Power Regulations.
Compared with conventional secondary-side Regulation approach; the FSEZ1016A can reduce total cost, component count, size, and weight; while simultaneously increasing efficiency, productivity, and system reliability.

Features
■ Constant-Voltage (CV) and Constant-Current (CC) Control without Secondary-Feedback Circuitry
■ Accurate Constant Current Achieved by Fairchild’s Proprietary TRUECURRENT™ Technique
■ Green Mode: Frequency Reduction at Light-Load
■ Fixed PWM Frequency at 43kHz with Frequency Hopping to Reduce EMI
■ Low Startup Current: 10μA Maximum
■ Low Operating Current: 3.5mA
■ Peak-Current-Mode Control in CV Mode
■ Cycle-by-Cycle Current Limiting
■ Over-Temperature Protection (OTP) with Auto-Restart
■ Brownout Protection with Auto-Restart
■ VDD Over-Voltage Protection (OVP) with Auto-Restart
■ VDD Under-Voltage Lockout (UVLO)
■ SOIC-7 Package

Applications
■ Battery Chargers for Cellular Phones, Cordless Phones, PDAs, Digital Cameras, Power Tools
■ Replaces Linear Transformer and RCC SMPS
■ Offline High Brightness (HB) LED Drivers

Part Name(s) : UCC28720 UCC28720D UCC28720DR TI
Texas Instruments
Description : Constant-Voltage, Constant-Current Controller With Primary-Side Regulation View

DESCRIPTION

The UCC28720 flyback Power supply controller provides isolated-output Constant-Voltage (CV) and Constant-Current (CC) output Regulation without the use of an optical coupler. The devices process information from the primary Power Switch and an auxiliary flyback winding for precise control of output voltage and current.



FEATURES

• < 10-mW No-Load Power

Primary-Side Regulation (PSR) Eliminates Opto-Coupler

• ±5% Voltage and Current Regulation Across Line and Load

• 700-V Start-Up Switch

• 80-kHz Maximum Switching Frequency Enables High-Power Density Charger Designs

• Quasi-Resonant Valley-Switching Operation for Highest Overall Efficiency

• Wide VDD Range Allows Small Bias Capacitor

• Dynamic BJT Drive

• Overvoltage, Low-Line, and Overcurrent Protection Functions

• Programmable Cable Compensation

• SOIC-7 Package



APPLICATIONS

• USB-Compliant Adapters and Chargers forConsumer Electronics

– Smart phones

– Tablet computers

– Cameras

• Standby Supply for TV and Desktop

• White Goods


Part Name(s) : FL7734 FL7734MX Fairchild
Fairchild Semiconductor
Description : Single-Stage Primary-Side-Regulation PWM Controller for PFC and Phase Cut Dimmable LED Driving View

Description
The FL7734 is a highly integrated PWM controller with advanced Primary-Side-Regulation (PSR) technique to minimize components for low Power LED lighting solutions. Using the innovative TRUECURRENT® technology for tight constant-current control, it enables designs with constant-current (CC) tolerance of less than ±1% in the wide line voltage range to meet stringent LED brightness requirements.
FL7734 can operate with all types of phase cut dimmers. Phase cut dimming is managed smoothly by Fairchild’s proprietary constant input current control and bleeding current control to achieve excellent dimmer compatibility without visible flicker.
The controller can automatically detect whether there is a dimmer connection. In non dimming mode, the operating mode is set to optimize Power factor and THD by enabling linear frequency control and voltage mode based on DCM.
An external high-voltage bleeding circuit is utilized to implement fast startup and high system efficiency. The FL7734 also provides Powerful protections, such as LED open / short, sensing resistor shorted, and over temperature for high system reliability. The FL7734 is available in 16-pin Small-Outline Package (SOP).

Features
■ Excellent Dimmer Compatibility by Active Dimming
   Control
■ Programmable Dimming Curve and Input Current
   Management
■ Constant LED Current Regulation in Large Phase
   Angle Range
■ Cost-Effective Solution without Input Bulk Capacitor
   and Feedback Circuitry
■ Accurate Constant-Current (CC) Control,
   Independent on Line Voltage, Output Voltage,
   Magnetizing Inductance Variation
Power Factor Correction (PFC)
■ Fast Startup utilizing Bleeding Circuit
■ Open-LED Protection
■ Short-LED Protection
■ Sensing Resistor Short Protection
■ Cycle-by-Cycle Current Limiting
■ Over-Temperature Protection with Auto Restart

Applications
■ LED Lighting System

Part Name(s) : FSEZ1216B FSEZ1216BNY Fairchild
Fairchild Semiconductor
Description : Primary-Side-Regulation PWM Integrated Power MOSFET View

Description
This highly integrated PWM controller provides several features to enhance the performance of low-Power flyback converters. The proprietary topology enables most simplified circuit design especially for battery charger applications. A low-cost, smaller, and lighter charger results when compared to a conventional design or a linear transformer. The startup current is only 10μA, which allows large startup resistance for further Power saving.

Features
● Constant-Voltage (CV) and Constant-Current (CC) Control without Secondary-Feedback Circuitry
● Green-Mode Function: PWM Frequency Linearly Decreasing
● Fixed PWM Frequency at 50kHz with Frequency Hopping to Solve EMI Problems
● Cable Compensation in CV mode
● Low Startup Current: 10μA
● Low Operating Current: 3.5mA
● Peak-Current-Mode Control in CV Mode
● Cycle-by-Cycle Current Limiting
● VDD Over-Voltage Protection (OVP) with Auto-Restart
● VDD Under-Voltage Lockout (UVLO)
● Fixed Over-Temperature Protection (OTP) with Latch
● DIP-8 Package Available

Applications
● Battery Chargers for Cellular Phones, Cordless Phones, PDA, Digital Cameras, Power Tools
● Best Choice to Replace Linear Transformer and RCC SMPS

Part Name(s) : UCC28722 UCC28722DBVR UCC28722DBVT Texas-Instruments
Texas Instruments
Description : Constant-Voltage, Constant-Current Controller With Primary-Side Regulation, BJT Drive View

Description

The UCC28722 flyback Power supply controller provides isolated-output constant-voltage (CV) and constant-current (CC) output Regulation without the use of an optical coupler. The device processes

information from the primary Power Switch and an auxiliary flyback winding for precise control of output voltage and current.



Features

• < 50-mW No-Load Power

Primary-Side Regulation (PSR) Eliminates OptoCoupler

• Dynamic BJT Drive

• ± 5% Voltage and Current Regulation Across Line and Load

• 80-kHz Maximum Switching Frequency Enables High-Power Density Charger Designs

• Quasi-Resonant Valley-Switching Operation for Highest Overall Efficiency

• Wide VDD Range Allows Small Bias Capacitor

• Output Overvoltage, Low-Line, and Overcurrent Protection Functions

• Programmable Cable Compensation

• SOT23-6 Package



Applications

• USB-Compliant Adapters and Chargers for Consumer Electronics

– Smart Phones

– Tablet Computers

– Cameras

• Standby Supply for TVs and Desktops

• White Goods


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