CS5124 Datasheet | Cherry Semiconductor Corporation

Description The CS5124/6 is a fixed frequency current mode controller designed specifically for DC-DC converters found in the telemunications industry. The CS5124/6 integrates many monly 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: 400k Hz w/VBIAS Pin, 195m V first current sense threshold CS5126: 200k Hz w/SYNC Pin, 335m V first current sense threshold The CS5124/6 integrates the following features : Internal Oscillator, Slope pensation, 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 17.4k CTX15-14514 T1 5VOUT MBRD360CT D4 R3 47Ω Q2 IRFR220 R8 0.39Ω Package Options 8 Lead SO Narrow CS5124 BAS16LT1 C1 0.1µF, 100V C4 0.47µF, 25V C3 .022µF R6 1k C6 R7 30.1k C5 47µF, 10V BIAS UVLO Gnd GATE BIAS ENABLE UVLO SS C7 0.1µF Gnd GATE IS U2 ISENSE VFB .01µF C9 1000p F C8 1000p F TPS5908 R9 10.0k ISOLATED RTN CS5126 UVLO SYNC Gnd GATE 48VRTN ISENSE...