{"id":6445,"date":"2026-06-16T03:43:44","date_gmt":"2026-06-16T03:43:44","guid":{"rendered":"https:\/\/materialparts.com\/kp3211sga\/"},"modified":"2026-06-16T03:43:44","modified_gmt":"2026-06-16T03:43:44","slug":"kp3211sga","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/kp3211sga\/","title":{"rendered":"KP3211SGA"},"content":{"rendered":"

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

The KP3211SGA is a high-precision primary-side regulation (PSR) LED driver IC from Kiwi Instruments, designed for offline LED lighting applications. It supports constant current (CC) and constant voltage (CV) output using primary-side sensing, eliminating the need for an optocoupler and secondary feedback circuitry. With built-in PFC and comprehensive protection features, it enables compact, low-cost LED driver designs in SOT-23-6 package.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u62d3\u6251\u7ed3\u6784<\/td>\nPrimary-side regulation (PSR) flyback<\/td>\n<\/tr>\n
Output Mode<\/td>\nCC + CV (constant current \/ constant voltage)<\/td>\n<\/tr>\n
\u8f93\u5165\u7535\u538b\u8303\u56f4<\/td>\n85VAC to 265VAC (universal)<\/td>\n<\/tr>\n
\u5f00\u5173\u9891\u7387<\/td>\nUp to 100kHz<\/td>\n<\/tr>\n
LED Current Accuracy<\/td>\n\u00b13%<\/td>\n<\/tr>\n
Active PFC<\/td>\nBuilt-in (power factor > 0.9)<\/td>\n<\/tr>\n
Startup Current<\/td>\n<10\u00b5A<\/td>\n<\/tr>\n
Operating Current<\/td>\n1.5mA (typical)<\/td>\n<\/tr>\n
MOSFET Drive<\/td>\nExternal N-channel MOSFET<\/td>\n<\/tr>\n
Protection<\/td>\nOVP, OCP, OTP, SCP, LED open\/short<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSOT-23-6<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to +105\u00b0C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Primary-side regulation eliminates optocoupler and secondary feedback<\/li>\n
  • CC\/CV output for LED driving and battery charging<\/li>\n
  • Built-in active PFC for high power factor (> 0.9)<\/li>\n
  • \u00b13% LED current accuracy<\/li>\n
  • Ultra-low startup current: <10\u00b5A<\/li>\n
  • Programmable LED current via external resistor<\/li>\n
  • Comprehensive protection: OVP, OCP, OTP, SCP<\/li>\n
  • LED open-circuit and short-circuit protection<\/li>\n
  • Low EMI design with frequency jittering<\/li>\n
  • Meets IEC 61000-3-2 harmonic requirements<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • LED bulbs and downlights (3W-15W)<\/li>\n
    • LED tube lights (T5\/T8)<\/li>\n
    • LED panel lights and ceiling lamps<\/li>\n
    • Battery chargers with CC\/CV profile<\/li>\n
    • Small-power offline power supplies<\/li>\n
    • Smart LED lighting with dimming<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The KP3211SGA is a high-precision primary-side regulation (PSR) LED driver IC from Kiwi Instruments, designed for offline LED lighting applications. It supports constant current (CC) and constant voltage (CV) output using primary-side sensing, eliminating the need for an optocoupler and secondary feedback circuitry. With built-in PFC and comprehensive protection features, it enables compact, […]<\/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":[288],"class_list":["post-6445","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-led-driver-ics","chip_brand-kiwi"],"acf":{"brief_explanation":"PSR LED driver IC, CC+CV, 85-265VAC, \u00b13% CC, built-in PFC, SOT-23-6, optocoupler-free","date_code":"","package_case":"SOT-23-6 (2.9 x 2.8 x 1.1mm)","in_stock":3420,"datasheet":"https:\/\/www.kiwi-ic.com\/upload\/file\/KP3211.pdf","price":"$0.22 @ 1ku","product_introduction":"The KP3211SGA is a primary-side regulation (PSR) LED driver IC from Kiwi Instruments, designed for offline constant-current LED lighting applications. By sensing the output current through the primary-side flyback waveform, it eliminates the need for an optocoupler and secondary feedback components, reducing BOM cost and improving reliability. The device operates in both constant-current (CC) and constant-voltage (CV) modes, making it suitable for LED driving and battery charging applications. Built-in active PFC achieves power factor greater than 0.9, meeting IEC 61000-3-2 harmonic requirements. The \u00b13% LED current accuracy ensures consistent brightness across production units. Comprehensive protection features including over-voltage, over-current, over-temperature, and LED open\/short protection ensure safe operation under fault conditions.","working_principle":"The KP3211 uses primary-side regulation to control the flyback converter output without direct secondary-side feedback. During the MOSFET off-time, the magnetizing inductance of the transformer discharges energy to the secondary side. The primary-side auxiliary winding reflects the output voltage; by sampling this voltage at the right moment (when the secondary current reaches zero \u2014 discontinuous conduction mode), the IC accurately determines the output voltage. The output current is calculated from the peak primary current (sensed through an external sense resistor) and the discharge time. The CC loop maintains constant average LED current by controlling the peak current and switching frequency. The CV loop takes over when the load is removed, preventing output voltage from rising above the OVP threshold. Active PFC is achieved by shaping the input current to follow the input voltage waveform.","pin_description":"
      Pin<\/th>Name<\/th>Description<\/th><\/tr>
      1<\/td>CS<\/td>Current sense input (connect to source resistor)<\/td><\/tr>
      2<\/td>GND<\/td>Ground<\/td><\/tr>
      3<\/td>GATE<\/td>Gate drive output (to external N-FET)<\/td><\/tr>
      4<\/td>VDD<\/td>IC power supply (decouple with capacitor)<\/td><\/tr>
      5<\/td>FB<\/td>Feedback input from auxiliary winding<\/td><\/tr>
      6<\/td>NC<\/td>No connect<\/td><\/tr><\/table>","application_scenarios":"
      • LED Bulb Driver (7W):<\/b> Design a compact 7W LED bulb driver using the KP3211 in a boundary-conduction-mode flyback. The primary-side regulation eliminates the optocoupler, reducing component count and board area to fit within the bulb base. The built-in PFC ensures compliance with energy regulations. Set LED current via the CS pin sense resistor.<\/li>
      • LED Tube Light (T8, 18W):<\/b> Use the KP3211 for a high-PF T8 tube driver. The CV mode provides safe output limiting during open-load conditions (when the tube is removed). The LED short-circuit protection prevents thermal runaway if individual LEDs fail short. The frequency jittering feature reduces EMI filter requirements.<\/li>
      • Battery Charger (CC\/CV):<\/b> Leverage the dual CC\/CV mode for lithium-ion battery charging. The CC mode charges the battery at a constant rate until it reaches the voltage threshold, then the CV mode maintains the voltage as current tapers. The OVP feature prevents overcharging if the battery is disconnected during the CV phase.<\/li><\/ul>","alternative_models":"
        Model<\/th>Topology<\/th>PFC<\/th>CC Accuracy<\/th>Key Difference<\/th><\/tr>
        BP3122<\/td>PSR<\/td>No<\/td>\u00b15%<\/td>Lower cost, no PFC<\/td><\/tr>
        SY50283<\/td>PSR<\/td>Built-in<\/td>\u00b13%<\/td>Silergy, similar features<\/td><\/tr>
        OB2538<\/td>PSR<\/td>No<\/td>\u00b15%<\/td>OnBright, basic PSR<\/td><\/tr>
        CR6842T<\/td>PSR+SSR<\/td>No<\/td>\u00b12%<\/td>ChipRail, higher accuracy<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6445","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=6445"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6445\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=6445"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=6445"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=6445"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=6445"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}