High Performance, Integrated Current Mode PWM Controllers

The CS5124/6 is a fixed frequency current mode controller designed specifically for DC–DC converters found in the telecommunications industry. The CS5124/6 integrates many commonly required current mode power supply features and allows the power supply designer to realize substantial cost and board space savings. The product matrix is as follows:

CS5124: 400 kHz w/VBIAS Pin, 195 mV first current sense threshold.

CS5126: 200 kHz w/SYNC Pin, 335 mV first current sense threshold.

The CS5124/6 integrates the following features: Internal Oscillator, Slope Compensation, Sleep On/Off, Undervoltage Lock Out, Thermal Shutdown, Soft Start Timer, Low Voltage Current Sense for Resistive Sensing, Second Current Threshold for Pulse by Pulse Over Current Protection, a Direct Optocoupler Interface and Leading Edge Current Blanking.

The CS5124/6 has supply range of 7.7 V to 20 V and is available in 8 pin SO narrow package.

Features

• Line UVLO Monitoring

• Low Current Sense Voltage for Resistive Current Sensing

• External Synchronization to Higher or Lower Frequency Oscillator (CS5126 Only)

• Bias for Start Up Circuitry (CS5124 Only)

• 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