{"id":6551,"date":"2026-06-18T13:51:57","date_gmt":"2026-06-18T13:51:57","guid":{"rendered":"https:\/\/materialparts.com\/bp3122\/"},"modified":"2026-06-18T13:51:57","modified_gmt":"2026-06-18T13:51:57","slug":"bp3122","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/bp3122\/","title":{"rendered":"BP3122"},"content":{"rendered":"

\u4ea7\u54c1\u6982\u89c8<\/h2>\n

The BP3122 from Bright Power Semiconductor is a high-precision primary-side regulation (PSR) constant-current LED driver with an integrated 650V power MOSFET. Designed for flyback converters under universal input, it requires no secondary feedback circuit or auxiliary winding, making it ideal for compact LED lighting applications up to 5W.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n
Internal MOSFET<\/td>\n650V N-channel<\/td>\n<\/tr>\n
Output Power<\/td>\nUp to 5W (universal input)<\/td>\n<\/tr>\n
\u8f93\u5165\u7535\u538b<\/td>\n85VAC to 265VAC<\/td>\n<\/tr>\n
LED Current Accuracy<\/td>\n+\/-5%<\/td>\n<\/tr>\n
\u5f00\u5173\u9891\u7387<\/td>\n65-70kHz<\/td>\n<\/tr>\n
Max Duty Cycle<\/td>\n42%<\/td>\n<\/tr>\n
Current Sense Threshold<\/td>\n500mV<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSOP-8<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40 to +105 C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Integrated 650V power MOSFET<\/li>\n
  • Primary-side feedback, no secondary circuit needed<\/li>\n
  • No auxiliary winding required for sensing or supply<\/li>\n
  • Ultra-low operating current<\/li>\n
  • +\/-5% LED current accuracy<\/li>\n
  • LED open\/short circuit protection<\/li>\n
  • CS resistor short circuit protection<\/li>\n
  • Over-temperature protection at 150 C<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • GU10 LED spotlights<\/li>\n
    • LED bulb lamps<\/li>\n
    • AC LED lighting up to 5W<\/li>\n
    • Isolated LED power supplies<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The BP3122 from Bright Power Semiconductor is a high-precision primary-side regulation (PSR) constant-current LED driver with an integrated 650V power MOSFET. Designed for flyback converters under universal input, it requires no secondary feedback circuit or auxiliary winding, making it ideal for compact LED lighting applications up to 5W. Key Specifications Internal MOSFET 650V […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,33],"tags":[],"chip_brand":[291],"class_list":["post-6551","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-led-driver-ics","chip_brand-bpsemi"],"acf":{"brief_explanation":"PSR constant-current LED driver with 650V MOSFET, 5W, no aux winding, SOP-8","date_code":"","package_case":"SOP-8","in_stock":5047,"datasheet":"https:\/\/www.bpsemi.com\/uploads\/product\/BP3122_DS_Rev.1.2.pdf","price":"$0.18 @ 10ku","product_introduction":"The BP3122 is a high-precision primary-side regulation (PSR) constant-current LED driver from Bright Power Semiconductor with an integrated 650V power MOSFET. It operates in discontinuous conduction mode and is designed for flyback converters under universal input (85-265VAC). The primary-side feedback technology eliminates the need for secondary sensing and feedback circuits, as well as auxiliary windings for supply and sensing. This results in minimal external component count and small system size. The LED current accuracy is +\/-5% with excellent line and load regulation.","working_principle":"The BP3122 uses primary-side regulation (PSR) to control LED current without secondary feedback. During the MOSFET off-time, the demagnetization of the transformer is sensed through the DRAIN pin. The output current is derived from the peak primary current and the transformer turns ratio. Cycle-by-cycle current limiting is implemented through a current sense (CS) resistor compared to an internal 500mV reference. The source driver architecture reduces operating current. Protection functions include LED open-circuit (over-voltage) latch, LED short-circuit (low frequency operation at 5kHz), CS resistor short-circuit latch, VCC undervoltage lockout, and over-temperature shutdown at 150 C.","pin_description":"
      Pin<\/th>Name<\/th>Function<\/th><\/tr>
      1<\/td>CS<\/td>Current sense input (sense resistor to GND)<\/td><\/tr>
      2<\/td>GND<\/td>Ground<\/td><\/tr>
      3<\/td>VCC<\/td>IC power supply<\/td><\/tr>
      4<\/td>OUT<\/td>Internal MOSFET source output<\/td><\/tr>
      5-6<\/td>DRAIN<\/td>Internal MOSFET drain<\/td><\/tr>
      7<\/td>NC<\/td>Not connected (must be floating)<\/td><\/tr>
      8<\/td>NC<\/td>Not connected (must be floating)<\/td><\/tr><\/table>","application_scenarios":"
      • GU10 LED spotlight drivers with minimal external components<\/li>
      • LED bulb lamps requiring compact, isolated power supply under 5W<\/li>
      • AC mains LED lighting with universal input voltage range<\/li>
      • Low-power offline LED drivers needing PSR without secondary feedback<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Key Difference<\/th><\/tr>
        BP3125<\/td>BP Semi<\/td>Higher power version<\/td><\/tr>
        BP3128<\/td>BP Semi<\/td>Different pinout, similar function<\/td><\/tr>
        OB2538<\/td>On-Bright<\/td>PSR LED driver, similar power range<\/td><\/tr>
        LNK304DG<\/td>Power Integrations<\/td>Buck converter, non-isolated<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6551","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/comments?post=6551"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6551\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=6551"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=6551"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=6551"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=6551"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}