FEATURES
 General Primary Side Constant-Current (CC)
Control Supports DCM and CCM Operation
 ± 5% CC Regulation, ± 1% CV Regulation
with Fast Dynamic Response
 CC Algorithm Compensates for Line
Variation and Transformer Inductance
Tolerance
 Less than 75mW Standby Power for sub
30W Application
 Current Mode Control
 Built-in Frequency Shuffling
 Fixed 65KHz Switching Frequency
 Green Mode and Burst Mode Control
 On-chip Thermal Shutdown
 Cycle-by-Cycle Current Limiting
 Built-in Leading Edge Blanking
 Built-in Slope Compensation
 Very Low Startup and Operation Current
 Available with SOT23-6 Package

GENERAL DESCRIPTIONDP2291 is a high performance current modePWMcontroller for offline flyback converter applications.The IC has built-in General Primary SideCCcontrol, which simplifies isolated power supplydesign that requires CC regulation of theoutput.
In DP2291, PWM switching frequencywithshuffling is fixed to 65KHz and is trimmedtotightrange. The IC has built-in green andburst modecontrol for light and zero loadings, whichcanachieve less than 75mWstandby power for sub30W applications.. DP2291 integrates functions and protectionsofUnder Voltage Lockout (UVLO), VDDover VoltageProtection (VDD OVP), Cycle-by-cycleCurrentLimiting (OCP), Short Load Protection(SLP), OverLoad Protection (OLP), On-ChipThermal
Shutdown (OTP), Soft Start, VDDClamping,etc.