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Leadtrend Technology
Leadtrend Technology
Description : Green-Mode PWM Controller with Integrated Protections

General Description
The LD7552B are low cost, low startup current, current mode PWM Controllers with Green-Mode power- saving operation. The Integrated functions include the leading-edge blanking of the current sensing, internal slope compensation. They provide the users a superior AC/DC power application of higher efficiency, low external component counts, and lower cost solution.

Features
● High-Voltage CMOS Process with Excellent ESD
   protection
● Very Low Startup Current (<20μA)
● Current Mode Control
● Non-audible-noise Green Mode Control
● UVLO (Under Voltage Lockout)
● LEB (Leading-Edge Blanking) on CS Pin
● Programmable Switching Frequency
● Internal Slope Compensation
● OVP (Over Voltage Protection) on Vcc Pin
● OLP (Over Load Protection)
● 500mA Driving Capability

Applications
● Switching AC/DC Adaptor and Battery Charger
● Open Frame Switching Power Supply
● 384X Replacement

Part Name(s) : HT7A6003
Holtek Semiconductor
Holtek Semiconductor
Description : EMI-Improved Green Mode PWM Controller with Integrated Protections (Rev - 2011)

Description
HT7A6003 is an advanced, highly integration OffLine PWM Controller. This device provides many protection functions with ultra low power circuit design, and is optimized for restraining EMI. By Integrated a Non-Audible Noise Green Mode Control Scheme and optimizing for the Energy Star 2.0 spec., the Power Supply Unit (PSU) implemented using the HT7A6003 can satisfy the “Energy Star NoLoad Mode” Stand-by Power standard, which is less than 0.3W within all Nameplate Output Power Range of 0~250W. This device also Integrated various protection functions such as Short-Circuit Protection (SCP, which can also be used for Over-Load Protection, OLP), Cycle-by-Cycle Current Limiting, Over Voltage Protection (OVP), and Soft-Start function for reducing inrush current during system initialization and preventing device burn-out.
The HT7A6003 also integrates Leading-Edge Blanking and Slope Compensation for minimizing external components cost and system complexity.

Feature
• Frequency jitter for restraining EMI
Integrated Soft-Start function
• Very low operating current and start-up current (<20mA) for satisfying Energy-Star 2.0 "No-Load Mode" (Stand-by) power standard
• ±5% trimmed oscillator for precise frequency
• Programmable switching frequency
• Non-audible-noise Green Mode Control
• LEB (Leading-Edge Blanking) on CS pin
• Internal slope compensation
• Cycle-by-Cycle current limiting
• Short-Circuit-Protection(SCP) for Short-Circuit and Over-Load condition
• Over-Voltage-Protection(OVP) on VCC Pin
• 8-Pin SOP package

Applications
• Switching AC-DC adaptor
• Open frames switching power supply
• UPS
• LCD TV

Part Name(s) : HT7A6003
Holtek Semiconductor
Holtek Semiconductor
Description : EMI-Improved Green Mode PWM Controller with Integrated Protections

Description
HT7A6003 is an advanced, highly integration OffLine PWM Controller. This device provides many protection functions with ultra low power circuit design, and is optimized for restraining EMI. By Integrated a Non-Audible Noise Green Mode Control Scheme and optimizing for the Energy Star 5.0 spec., the Power Supply Unit (PSU) implemented using the HT7A6003 can satisfy the “Energy Star NoLoad Mode” Stand-by Power standard, which is less than 0.3W within all Nameplate Output Power Range of 0~250W. This device also Integrated various protection functions such as Short-Circuit Protection (SCP, which can also be used for Over-Load Protection, OLP), Cycle-by-Cycle Current Limiting, Over Voltage Protection (OVP), and Soft-Start function for reducing inrush current during system initialization and preventing device burn-out.
The HT7A6003 also integrates Leading-Edge Blanking and Slope Compensation for minimizing external components cost and system complexity.

Feature
• Frequency jitter for restraining EMI
Integrated Soft-Start function
• Very low operating current and start-up current (<20mA) for satisfying Energy-Star 5.0 "No-Load Mode" (Stand-by) power standard
• ±5% trimmed oscillator for precise frequency
• Programmable switching frequency
• Non-audible-noise Green Mode Control
• LEB (Leading-Edge Blanking) on CS pin
• Internal slope compensation
• Cycle-by-Cycle current limiting
• Short-Circuit-Protection(SCP) for Short-Circuit and Over-Load condition
• Over-Voltage-Protection(OVP) on VCC Pin
• 8-Pin SOP package

Applications
• Switching AC-DC adaptor
• Open frames switching power supply
• UPS
• LCD TV

Unspecified
Unspecified
Description : Green-Mode PWM Controller with Integrated Protections and Adjustable OLP Delay Time

[Leadtrend Technology Corporation]

General Description
The LD7552D are specifically designed for the low total system cost by integrating many functions, Protections, and the EMI-improved solution in a SOP-8 package which usually need a lot of extra components or circuits on the general designs.

Features
● High-Voltage CMOS Process with Excellent ESD
   protection
● Very Low Startup Current (<20μA)
● Current Mode Control
● Non-audible-noise Green Mode Control
● UVLO (Under Voltage Lockout)
● LEB (Leading-Edge Blanking) on CS Pin
● Adjustable OLP Delay Time.
● Internal Slope Compensation
● OVP (Over Voltage Protection) on Vcc Pin
● OLP (Over Load Protection)
● 500mA Driving Capability

Applications
● Switching AC/DC Adaptor and Battery Charger
● Open Frame Switching Power Supply

Part Name(s) : FAN6753 FAN6753MY
Fairchild Semiconductor
Fairchild Semiconductor
Description : Highly Integrated Green-Mode PWM Controller

Description
The highly Integrated FAN6753 PWM Controller provides several features to enhance the performance of flyback converters.

Features
■ High-Voltage Startup
■ Low Operating Current: 2.7mA
■ Adaptive Decreasing PWM Frequency to 22KHz
■ Built-in Full-Range Frequency Hopping to Reduce EMI Emission
■ Fixed PWM Frequency: 65KHz
■ Peak-Current-Mode Control
■ Cycle-by-Cycle Current Limiting
■ Leading-Edge Blanking (LEB)
■ Synchronized Slope Compensation
■ Internal Auto-Recovery Open-Loop Protection
■ GATE Output Maximum Voltage Clamp: 18V
■ VDD Under-Voltage Lockout (UVLO)
■ VDD Over-Voltage Protection (OVP), Auto Recovery / Latch for Option
■ Internal Auto-Recovery Sense Short-Circuit Protection for Option
■ Constant Power Limit (Full AC Input Range)
■ Internal OTP Sensor with Hysteresis
■ Built-in 5ms Soft-Start Function
■ Built-in LATCH Pin Pull HIGH (> 5.2V) Latch Function

Applications
General-purpose switch-mode power supplies and flyback power converters, including:
■ Power Adapters
■ Open-Frame SMPS

Part Name(s) : FAN6755 FAN6755MY
Fairchild Semiconductor
Fairchild Semiconductor
Description : Highly Integrated Green-Mode PWM Controller

Description
This highly Integrated PWM Controller provides several features to enhance the performance of flyback converters.
To minimize standby power consumption, a proprietary adaptive Green-Mode function reduces switching frequency at light-load condition. To avoid acoustic noise problems, the minimum PWM frequency is set above 23kHz. This Green-Mode function enables the power supply to meet international power conservation requirements, such as Energy Star®. with the internal high-voltage startup circuitry,the power loss caused by bleeding resistors is also eliminated. To further reduce power consumption, FAN6755 uses the BiCMOS process, which allows an operating current of only 2mA. The standby power consumption can be under 100mW for most of LCD monitor power supply designs.

Features
Internal High-Voltage Startup
Low Operating Current (Maximum: 2mA)
Adaptive Decreasing of PWM Frequency to 23KHz at Light-Load condition to Improve Light-Load Efficiency
Frequency Hopping to Reduce EMI Emission
Fixed PWM Frequency: 65KHz
Internal Leading-Edge Blanking
Built-in Synchronized Slope Compensation
Auto-Restart Protection : Feedback Open-Loop Protection (OLP), VDDOver-Voltage Protection (OVP), Over-Temperature Protection (OTP), and Line Over-Voltage Protection
Soft Gate Drive with Clamped Output Voltage: 18V
VDD Under-Voltage Lockout (UVLO)
Programmable Constant Power Limit (Full AC Input Range)
Internal OTP Sensor with Hysteresis
Build-in 5ms Soft-Start Function
Input Voltage Sensing (VINPin) for Brown-in/out Protection with Hysteresis and Line Over-Voltage Protection

Applications
General-purpose switched-mode power supplies and flyback power converters, including:
  LCD Monitor Power Supply
  Open-Frame SMPS

Description : Highly Integrated Green-Mode PWM Controller

Description
The highly Integrated SG6742ML/MR PWM Controller provides several features to enhance the performance of flyback converters.
To minimize standby power consumption, a proprietary Green-Mode function provides off-time modulation to linearly decrease the switching frequency at light-load conditions. To avoid acoustic-noise problems, the minimum PWM frequency is set above 22KHz. The Green-Mode function enables the power supply to meet international power conservation requirements. with the internal high-voltage startup  circuitry, the power loss due to bleeding resistors is also eliminated. To further reduce power consumption, SG6742ML/MR is manufactured using the BiCMOS process, which allows an operating current of only 2.7mA.

Features
ƒ  High-Voltage Startup
ƒ  Low Operating Current: 2.7mA
ƒ  Linearly Decreasing PWM Frequency to 22KHz
ƒ  Frequency Hopping to Reduce EMI Emission
ƒ  Fixed PWM Frequency: 65KHz
ƒ  Peak-Current-Mode Control
ƒ  Cycle-by-Cycle Current Limiting
ƒ  Leading-Edge Blanking
ƒ  Synchronized Slope Compensation
ƒ  Internal Open-Loop Protection
ƒ  GATE Output Maximum Voltage Clamp: 18V
ƒ  VDDUnder-Voltage Lockout (UVLO)
ƒ  VDDOver-Voltage Protection (OVP)
ƒ  Programmable Over-Temperature Protection (OTP)
ƒ  Internal Latch Circuit (OVP, OTP)
ƒ  Internal Sense Short-Circuit Protection
ƒ  Build-in 5ms Soft-Start Function
ƒ  Constant Power Limit (Full AC Input Range)
ƒ  Internal OTP Sensor with Hysteresis

Applications
General-purpose switch-mode power supplies and flyback power converters, including:
ƒ  Power Adapters
ƒ  Open-Frame SMPS

Fairchild Semiconductor
Fairchild Semiconductor
Description : Highly Integrated Green-Mode PWM Controller

Description
The SG6846A is especially designed for SMPS with surge-current output, incorporated with a two-level OCP function. Besides the cycle-by-cycle current limiting, if the switching current is higher than two thirds the peak
current threshold for 1700ms, over-current protection is activated such that the SG6846A is latched off.

Features
Low Startup Current: 8µA
Low Operating Current: 3.7mA
Peak-Current Mode of Operation with Cycle-by Cycle Current Limiting
PWM Frequency Continuously Decreasing with Burst Mode at Light Loads
VDDOver-Voltage Protection (OVP)
AC Input Brownout Protection with Hysteresis
Constant Output Power Limit (Full AC Input Range)
Internal Latch Circuit for OVP, OTP, and OCP
Two-level OCP Delay: 1600ms
Output Short-Circuited Delay Time: 100ms
Programmable PWM Frequency with Frequency Hopping
OCP Threshold is Half Peak Current Limit
Feedback Open-loop Protection with 1700ms Delay
Built-in Soft-Start

Applications
General-purpose switch-mode power supplies and flyback power converters, including:
Power Adapters
Open-frame SMPS
SMPS with Surge-current Output, such as for Printers, Scanners, Motor Drivers

Part Name(s) : AN-9719
Fairchild Semiconductor
Fairchild Semiconductor
Description : Applying Fairchild Power Switch (FPS™) FSL1x7 to Low- Power Supplies

Introduction
The highly Integrated FSL-series consists of an Integrated current-mode Pulse Width Modulator (PWM) and an avalanche-rugged 700V SenseFET. It is specifically designed for high-performance offline Switched Mode Power Supplies (SMPS) with minimal external components.

The features of the Integrated PWM Controller include a proprietary Green-Mode function providing off-time modulation to linearly decrease the switching frequency at light-load conditions to minimize standby power consumption. The PWM Controller is manufactured using the BiCMOS process to further reduce power consumption. The green mode and burst mode functions with a low operating current (2mA in green mode) maximize light-load efficiency so that the power supply can meet stringent standby power regulations.

Unspecified
Unspecified
Description : High-Integrated Green-Mode PWM Controller

[©System General Corp.]

DESCRIPTION
This highly Integrated PWM Controllers, SG6841 series, provides several features toenhance the performance of low power flyback converters. To minimize standby power consumption, the proprietary Green-Mode function provides off-time modulation to linearly decrease the switching frequency under light-load conditions. This Green-Mode function assists the power supply to easily meet the power conservation requirement.

FEATURES
Green-Mode PWM to support “Blue Angel” Norm
Low start up current 30uA
Low operation current 3mA
Leading-edge blanking
Built-in synchronized slope compensation
  Constant output power limit for universal AC input
Current mode operation
Cycle-by-cycle current limiting
Under voltage lockout (UVLO)
Programmable PWM frequency
GATE output maximum voltage clamped at 18V
Totem pole output includes soft driving for better EMI
Build-in limited-power-control to meet safety requirement
Programmable over-temperature protection
Few external components & low cost solution

APPLICATIONS
General-purpose switching mode power supplies and flyback power converters, and
  Power Adapter
  Open-frame SMPS
  Battery Charger Adapter

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