Tongjia Technology has introduced a high-voltage start-up, single-stage flyback power factor correction (PFC) control IC--LD 7830, which is a control IC with multiple integrated functions and protection, few external parts and a small footprint. It can be combined with modern LED light fixtures.
This product is a critical conduction mode PFC control IC. The steady-state switch on-time is fixed, and the switch-off time is variable. In order to adjust in time, the switching frequency will change due to different input voltages. Maneuvering changes. In addition, it provides overload protection, overcurrent protection, undervoltage lockout and built-in LED current sensing.
It is worth noting that the traditional PFC control requires an extra pin to sense the change of the input voltage as a feedback reference signal; the LD 7830 uses the voltage mode control PFC rule to simplify the design. .
Thanks to the high-voltage starting technology, high power supply and active switching control, the startup time is short and the resistance loss is small, so that the circuit can easily achieve the power factor (PF) >0.90 energy efficiency, and improve the energy usage of the electronic system, in line with energy saving. Regulations. Compared with the traditional current mode PFC, the LD 7830 has no main voltage sensing, and the energy saving efficiency is higher. A variety of protections make the system strong and can withstand the test of abnormal conditions.
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