Smart bypass diode claims industry’s lowest power dissipation performance
In a typical application, each SM74611 lowers power dissipation by 80 percent and reduces the operating temperature inside the junction box by 50 degrees C when compared with a similar box using three conventional Schottky diodes.
When a photovoltaic (PV) solar panel is shaded, the SM74611 active diode provides an alternate low-resistance path for string current to prevent hot spots that can damage the panel. The SM74611 protects the panel and improves PV solar panel reliability by boosting efficiency, and the reduced thermal dissipation enables more compact junction boxes with smaller heat-sinks.
“More stringent safety standards for junction boxes and increased currents from the newest generation of high-efficiency PV modules cannot be handled with conventional Schottky bypass diodes without significantly increasing the physical size of the junction box,” said Jörg Schmidt, director of sales for PV-Connecting Systems at Kostal Industrial Electronics. “TI’s SM74611 smart bypass diode enables us to easily increase the current rating of our line of SAMKO junction boxes from 10 A to 13 A without changing the physical design.”
The SM74611 joins TI’s family of solar products that include the UCD3138 digital power controller for solar micro-inverters, SM72441 maximum power point tracking controller and SM72295 full bridge driver.
The SM74611 smart bypass diode delivers 80-percent lower power dissipation than Schottky diodes reduces ambient temperature inside the junction box by 50 degrees C, improving the current rating of existing junction boxes, as well as enabling smaller boxes with improved current rating.
The device offers current handling up to 15 A with no avalanche effect and has a reduced leakage current in both forward and reverse operation that increases energy harvesting yield in PV arrays compared to traditional arrays using Schottky diodes. The D2PAK package is a drop-in replacement for conventional surface-mount Schottky diodes.
Availability and Pricing
The SM74611 smart bypass diode is available in volume now from TI and its authorized distributors. Offered in a two-terminal D2PAK package that measures 10.2 mm by 9 mm by 4.5 mm, the SM74611 is priced at $1.50 in 1,000-unit quantities.
Watch a video demonstration at www.ti.com/sm74611-prv
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