GENERAL DESCRIPTION
DP2545is a high performance offline PWM power switch for low power AC/DC charger and adapter applications.It operates in primary-side nsing and regulation.Conquently,opto-coupler and TL431could be eliminated.High Precision Constant Voltage (CV)and Constant Current (CC)control are integrated as shown in the figure below.In CC control,the current and output power tting can be adjusted externally by the n resistor Rs at CS pin.In CV control,multi-mode operations are utilized to achieve high performance and high efficiency.In addition,good load regulation is achieved by the built-in Cable Drop Compensation.Device operates in PFM in CC mode as well at large load condition and it operates in PWM with frequency reduction at light/medium load.The chip consumes very low operation current,it can achieve less than 75mW standby power.
DP2545offers comprehensive protection coverage with auto-recovery features including Cycle-by-Cycle current limiting,VDD Over Voltage Protection (VDD OVP),short circuit protection,built-in leading edge blanking,VDD under voltage lockout (UVLO),OTP,etc.
High precision constant voltage (CV)and constant current (CC)can be achieved by DP2545.DP2545is offered in DIP7package.
FEATURES
春节值班■±5%Constant Voltage Regulation and Current Regulation at Universal AC Input
■Primary Side Regulation (PSR)Without TL431and Opto-coupler
■No Need for Control Loop Compensation ■Programmable CV and CC Regulation ■Multi-Mode PWM/PFM Operation ■Output Short Load Protection ■Less than 75mW Standby Power
建立的近义词■Built-in Line Voltage and Primary Winding Inductance Compensation
■Built-in Adaptive Current Peak Regulation ■Programmable Cable Drop Compensation ■Audio Noi Free Operation
魔灯固件
■Built-in Over Temperature Protection (OTP)■Soft Gate Driver for Good EMI Performance ■Built-in Leading Edge Blanking (LEB)■Cycle-by-Cycle Current Limiting
■VDD Under Voltage Lockout with Hysteresis (UVLO)
■
VDD OVP &Clamp
APPLICATIONS
桌面绿色>边词张敬忠Low Power AC/DC offline SMPS for ■Cell Phone Charger ■Digital Camera Charger ■Small Power Adapter
■Auxiliary Power for PC,TV etc.血铸太平
■Linear Regulator/RCC Replacement快点英语
TYPICAL
APPLICATION
GENERAL INFORMATION Pin Configuration
The pin map of DIP7package is shown as
元宵节送礼
below.
Stress beyond tho listed under“absolute maximum ratings”may cau permanent damage to the device.The are stress ratings only,functional operation of the device at the or any other conditions beyond tho indicated under “recommended operating conditions”is not implied.Exposure to absolute maximum-rated conditions for extended periods may affect device reliability.
Marking Information
DP2545for product name;
XXXXXX the first X rerents the last year,2016is6;The cond X reprents the month,in A-L12letters;The third and fourth X on behalf of the date,01-31said;The last two X reprents the wafer batch code.
TERMINAL ASSIGNMENTS
BLOCK DIAGRAM
ELECTRICAL CHARACTERISTICS O
