CS51021A Series

Enhanced Current Mode PWM Controller for Forward or Flyback (36-72 V Telecom)

Catalog

Enhanced Current Mode PWM Controller for Forward or Flyback (36-72 V Telecom)

Part	Output Type	Output Phases	Mounting Type	Number of Outputs	Function	Frequency - Switching	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Supplier Device Package	Topology	Output Configuration	Operating Temperature [Max]	Operating Temperature [Min]	Control Features	Package / Case	Package / Case [x]	Package / Case [y]
ON Semiconductor CS51021AEDR16	Transistor Driver	1	Surface Mount	1	Step-Up/Step-Down	1 MHz	7.7 V	20 V	16-SOIC	Flyback Forward Converter Push-Pull	Isolation Capable Positive	85 °C	-40 °C	Current Limit Soft Start	16-SOIC	0.154 in	3.9 mm
ON Semiconductor CS51021ED16
ON Semiconductor CS51021AEDR16G	Transistor Driver	1	Surface Mount	1	Step-Up/Step-Down	1 MHz	7.7 V	20 V	16-SOIC	Flyback Forward Converter Push-Pull	Isolation Capable Positive	85 °C	-40 °C	Current Limit Soft Start	16-SOIC	0.154 in	3.9 mm
ON Semiconductor CS51021EDR16
ON Semiconductor CS51021AED16

Catalog

Enhanced Current Mode PWM Controller for Forward or Flyback (36-72 V Telecom)

Key Features

• 75mA Max.Startup Current

• Fixed Frequency Current Mode Control

• 1.0 MHz Switching Frequency

• Undervoltage Protection Monitor

• Overvoltage Protection Monitor with Programmable Hysteresis

• Programmable Dual Threshold Overcurrent Protection with Delayed Restart

• Programmable Soft Start

• Accurate Maximum Duty Cycle Limit

• Programmable Slope Compensation

• Leading Edge Current Sense Blanking

• 1.0 A Sink/Source Gate Drive

• Bidirectional Synchronization (CS51021A)

• 50ns PWM Propagation Delay

• 100 A Max Sleep Current (CS51022A)

• Pb-Free Packages are Available

Description

The CS51021 Fixed Frequency PWM Current Mode Controller family provides all necessary features required for ac-dc or dc-dc primary side control. Several features are included eliminating the additional components needed to implement them externally. In addition to low start-up current (75 µA)and high frequency operation capability, the Enhanced Current Mode PWM Controller includes overvoltage and undervoltage monitoring, externally programmable dual threshold overcurrent protection, current sense leading edge blanking, current slope compensation, accurate duty cycle control and an externally available 5.0 volt reference. The CS51021A features bidirectional synchronization capability, while the CS51022A offers a sleep mode with 100 µA maximum IC current consumption. The CS51021A/2A Enhanced Current Mode PWM Controllers are available in a SOIC-16 or TSSOP-16 lead package.