At the 2010 Guangzhou International Lighting Fair, Power Integrations, a leading supplier of LED driver ICs, introduced two active power factor correction LED driver ICs for LED lighting applications that support flicker-free thyristor dimming. They are LinkSwitch-PH (suitable for designing isolated power supplies) and LinkSwitch-PL (suitable for designing non-isolated power supplies).
LinkSwitch-PH
LinkSwitch-PH greatly simplifies the design of high efficiency LED drivers with thyristor dimming that require a power factor greater than 0.9. This highly integrated controller features a new control technology that not only provides very high power factor and accurate constant current output control, but also eliminates the need for passive circuits and optocouplers for power factor correction. Secondary current control circuit.
Each device integrates a 725 V power MOSFET, a continuous mode PWM controller, a self-biased high voltage switch current source, frequency jitter, cycle-by-cycle current limit, and hysteretic thermal shutdown on a single IC Break the circuit.
LinkSwitch-PL
Designed for compact replacement LEDs, the LinkSwitch-PL enables ultra-small, low cost, TRIAC dimming, single-stage power factor corrected constant current solid state lighting drivers. LinkSwitch-PL is suitable for direct detection of LED currents and operates over a wide input voltage range and delivers up to 16 W of output power. Its innovative control algorithm enables flashless TRIAC dimming with minimal external components.
Each device integrates a 725 V power MOSFET on a single IC, an innovative discontinuous mode variable frequency/variable on-time controller, frequency jitter, cycle-by-cycle current limit, and hysteretic thermal shutdown Break the circuit.
PI's LinkSwitch-PL chip
SCR dimming
LinkSwitch-PH/-PL can achieve flicker-free single-chip thyristor dimming, widening dimming range and monochromatic light, giving lighting users the experience of using incandescent lighting to achieve incandescent lighting Similar lighting effects.
The LinkSwitch--PH/--PL product family saves energy and reduces energy consumption. Both integrate single-stage power factor correction (PFC) and precise constant current output control with a power factor (PF) of over 0.9 and a total harmonic distortion (THD) of less than 20%, enabling SSL lamps to achieve 87% efficiency. . Both device families feature a monolithic design with integrated controller and MOSFET on a single die, which reduces component count and eliminates parasitic components between the controller and the power MOSFET, greatly simplifying PCB layout. These new LinkSwitch products not only simplify flyback power supply design, but also operate at input voltages up to 305 VAC with output powers up to 50W, so they can be used to develop a wide range of residential and commercial lighting applications worldwide. Single voltage products and universal input products.
Bill Weiss, Marketing Development Manager, Power Integrations, said: "The compatibility of ICs is very strong. From incandescent to LED, it turns out to have dimmers, while PI uses thyristor dimming, even if you buy The common dimmer on the market is compatible with the dimming effect. This shows that it is very adaptable, which can save you the replacement problem of all the configuration after changing the LED. In many commercial and industrial occasions With LED lights, manual control or automatic control dimming may be required in this case. PI products are also suitable for LED control in these applications because they are adapted."
High reliability without electrolytic input capacitor
The weakest link in LED lighting systems is the driver circuit because it is often subject to unreliable optocouplers and parasitic capacitance. Power Integrations' unique precision primary side control technology used in LinkSwitch products eliminates optocouplers. Moreover, the new LinkSwitch LED driver IC family does not require large parasitic capacitance, which eliminates the need for electrolytic input capacitors.
Bill Weiss said: "General LED drivers have a low lifetime and are easy to break, but these two ICs eliminate optocouplers and electrolytic capacitors because we have integrated the functions of optocouplers and electrolytic capacitors into the chip. The reliability of the driver is increased. Moreover, there is a temperature detector inside the chip. If the detected temperature exceeds 142 ° C., the circuit will automatically shut down automatically."
Samples of the LinkSwitch-PH device are now available in a halogen-free, ROHS-compliant eSIPâ--7C package, priced at $1.18 and $1.71 each in 10,000-piece quantities. The LinkSwitch--PL IC will be available in August 2010 and will be available in a compact SO--8 and eDIPä--12 package.
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