The CS5124 is a fixed frequency current mode controller designed specifically for DC−DC converters found in the telecommunications industry. The CS5124 integrates many commonly required current mode power supply features and allows the power supply designer to realize substantial cost and board space savings.

FEATUREs
• 400 kHz Oscillating Frequency
• Line UVLO Monitoring
• Low Current Sense Voltage for Resistive Current Sensing
• Bias for Startup Circuitry
• Thermal Shutdown
• Sleep On/Off Pin
• Soft−Start Timer
• Leading Edge Blanking
• Direct Optocoupler Interface
• 90 ns Propagation Delay
• 35 ns Driver Rise and Fall Times
• Sleep Mode
• Pb−Free Packages are Available