CS51221: Enhanced Voltage Mode PWM Controller for Forward or Flyback

The CS51221 Enhanced Voltage Mode PWM Controller contains all of the features necessary for basic voltage mode operation. This PWM controller has been optimized for high frequency primary side control operation. In addition, this device includes such features as: Soft Start, accurate duty cycle limit control, less than 50uA startup current, over and under voltage protection and bidirectional synchronization. The CS51221 is available in a SOIC-16 and TSSOP-16 surface mount packages.

Features
  • 1MHz Frequency Capability
  • Fixed Frequency Voltage Mode Operation, with Feed Forward
  • Thermal Shutdown
  • Under Voltage Lock-out
  • Accurate Programmable Max Duty Cycle Limit
  • 1A Sink/Source Gate Drive
  • Programmable Pulse-by-Pulse Overcurrent Protection
  • Leading Edge Current Sense Blanking
  • 75ns Shutdown Propagation Delay
  • Programmable Soft Start
  • Undervoltage Protection
  • Overvoltage Protection with Programmable Hysteresis
  • Bi-directional Synchronization
  • 25ns GATE Rise and Fall Time (1nF load)
  • 3.3V 3% Reference Voltage Output
  • Pb-Free Package is Available
Applications
  • Hot Swap - DC-DC Conversion
Package Drawings (2)
Document TitleDocument ID/SizeRevision
SOIC 16 LEAD751B-05 (38.2kB)K
TSSOP-16948F-01 (41.7kB)B
Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
Enhanced Voltage Mode PWM ControllerCS51221/D (172.0kB)8
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
CS51221ED16GLast ShipmentsAEC Qualified PPAP Capable Pb-free Halide freeSOIC-16751B-051Tube48
CS51221EDR16GActiveAEC Qualified PPAP Capable Pb-free Halide freeSOIC-16751B-051Tape and Reel2500$1.2
CS51221EDTB16GLast ShipmentsAEC Qualified PPAP Capable Pb-free Halide freeTSSOP-16948F-011Tube96
CS51221EDTB16R2GLast ShipmentsAEC Qualified PPAP Capable Pb-free Halide freeTSSOP-16948F-011Tape and Reel2500
Specifications
ProductTopologyControl Modefsw Typ (kHz)Stand-by ModeUVLO (V)Short Circuit ProtectionLatchSoft StartVCC Max (V)Drive Cap. (mA)
CS51221EDR16GForwardVoltage ModeUp to 1000NoYesNoYesYes151000
Enhanced Voltage Mode PWM Controller (172.0kB) CS51221
SOIC 16 LEAD MC14504B
TSSOP-16 MC14504B