CS5126

CS5124/6 CS5124/6 High Performance, Integrated Current Mode PWM Controllers Description 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: 400kHz w/VBIAS Pin, 195mV first current sense threshold CS5126: 200kHz w/SYNC Pin, 335mV first current sense threshold The CS5124/6 integrates the following features: Internal Oscillator, Slope Compensation, Sleep On/Off, Under Voltage 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 7.7V to 20V and is available in 8 pin SO narrow package. Features s Line UVLO Monitoring s Low Current Sense Voltage for Resistive Current Sensing s External Synchronization to Higher or Lower Frequency Oscillator (CS5126 Only) s Bias for Start up Circuitry (CS5124 Only) s Thermal Shutdown s Sleep On/Off Pin s Soft Start Timer s Leading Edge Blanking s Direct Optocoupler Interface s 90ns Propagation Delay Applications Diagram s 35ns Driver Rise and Fall Times s Sleep Mode D1 36-75VIN L1 10µH R2 200k C2 1.5µF, 100V R1 510k Q1 ZVN3310A R4 10Ω R5 ...