代理供应QH7939 QH7938

代理供应 QH7939 QH7938 QH7935 QH2213 QH9032 QH7939 General Description The QH7939 is a single-power stage, isolated and primary side offline LED lighting regulator which achieves high power factor. The proprietary real-current control method can control the LED current accurately from the primary side information. It can significantly simplify the LED lighting system design by eliminating the secondary side feedback components and the opto-coupler. The QH7939 integrates active power factor correction and works in Quasi Resonance mode (QRM) in order to reduce the power MOSFET switching losses. 代理供应 QH7939 QH7938 QH7935 QH2213 QH9032