General Description of CSC03A CSC03A is a power factor correction function of the LED drive chip, the internal integration of a startup clock, analog multiplier, zero current detection circuit, LEB front trigger circuit, output of the totem pole structure to drive the power MOS. Through constant on-time control to stabilize the output and achieve high power factor (PF) with low total harmonic distortion (THD)performance. And THD optimization module design allows IC to the input voltage rangeapplication design of multiplier high simulation of internal, and remained very low total harmonic distortion. CSC03A uses a circuit protection, good including: power supply voltageundervoltage latch, power supply voltage over-voltage protection, over-current protection, the output voltage clamp for the protection of the external power MOS.
Features of CSC03A •Off time control, zero current switching and the minimum clearance
• very low input current total harmonic current distortion (THD)
• isolated constant current output 400mA ± 1%,the precision of constant current high
• high efficiency, efficiency can reach more than 85%
• built-in active PFC function, power factor PF ≥ 0.95, THD ≤ 15% total harmonic
• over temperature protection, open circuit protection, short circuit protection
• high reliability and long-life design
• with LED lamp together through the safety and EMC standards
CSC03A and similar chip performance comparison
Application of flyback circuit, due to start and UVLO currents is small, easy to appearrepeatedly starting and poor starting, need to use smaller and larger starting capacitorstarting resistance increases, the standby power consumption. CSC03A on the UVLO increase, enable easy design.
2, output short circuit VDS
Application of flyback circuit, short circuit, not degaussing current accumulation is too large,abnormal Vds high, CSC03A is modified, reducing VDS short circuit voltage, short circuit to prevent high pressure frying machine.
3, VDD protection circuit
Empty / full switching flyback PFC circuit, slower, if VDD winding coupling not easily lead toVDD voltage beyond, cause damage, general L6562A increase the voltage stabilizing circuit.CSC03A increased OVP protection function, turn off the GATE when the VDD voltage is too high, save VDD, voltage regulator circuit (7 Yuan Qijian)
4, improve the starting noise, reduce the delay time
5, reduce the power consumption of Sense resistance
Down regulation of Vcs_clamp to 1.0V, reducing Rcs loss. At the same time, reduced the K value to 0.3
Aiming at the growing LED market, higher demands on the driving power supply. CSC03Awith a new design concept, with the input voltage, low feedback voltage, high PFC, wide output voltage and current range, high output power, high efficiency, flexible design, thermal management, excellent reliability, overall design features easy access to EMI/ safetycertification, more suitable for the application of LED lighting driver.
Keywords: flyback isolation drive LED driver CSC03A L6561 6562 6562A OB6561 OB6563SN03 SA7527 isolation fluorescent lamp driving IC high PFC and low THD, high performance and high efficiency over temperature protection circuit protection short circuit protection bysafety initiative PFC constant current accuracy, isolated output power factor correction THD fluorescent lamp with isolated power supply fluorescent external power supply