{"id":6941,"date":"2026-06-22T03:04:45","date_gmt":"2026-06-22T03:04:45","guid":{"rendered":"https:\/\/materialparts.com\/ucc28600dr\/"},"modified":"2026-06-22T03:04:45","modified_gmt":"2026-06-22T03:04:45","slug":"ucc28600dr","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/ucc28600dr\/","title":{"rendered":"UCC28600DR"},"content":{"rendered":"

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

The UCC28600DR from Texas Instruments is an 8-pin quasi-resonant flyback green-mode PWM controller with valley switching, 130kHz max frequency, and SOIC-8 package.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u7c7b\u578b<\/td>\nQuasi-Resonant Flyback Green-Mode Controller<\/td>\n<\/tr>\n
\u62d3\u6251\u7ed3\u6784<\/td>\nFlyback, Secondary-Side Regulated<\/td>\n<\/tr>\n
\u5f00\u5173\u9891\u7387<\/td>\n40 kHz to 130 kHz<\/td>\n<\/tr>\n
Max Duty Cycle<\/td>\n99%<\/td>\n<\/tr>\n
Start-up Current<\/td>\n25 uA (max)<\/td>\n<\/tr>\n
\u7535\u6e90\u7535\u538b<\/td>\n8V to 21V (VDD)<\/td>\n<\/tr>\n
\u6805\u6781\u9a71\u52a8\u8f93\u51fa<\/td>\n1A sink \/ -0.75A source (TrueDrive)<\/td>\n<\/tr>\n
Feedback<\/td>\nSecondary-side regulation (optocoupler)<\/td>\n<\/tr>\n
Protection<\/td>\nOVP, OCP, OTP, UVLO, Cycle-by-Cycle Power Limit<\/td>\n<\/tr>\n
Green-Mode Status Pin<\/td>\nYes (PFC disable function)<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSOIC-8 (D suffix)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40C to +105C (junction)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Quasi-resonant valley switching for reduced EMI and low switching losses<\/li>\n
  • Green-mode operation with frequency foldback at light load<\/li>\n
  • 25 uA max start-up current for minimal no-load power<\/li>\n
  • Programmable line and load over-voltage protection<\/li>\n
  • Internal over-temperature protection<\/li>\n
  • Cycle-by-cycle power limit with hiccup restart<\/li>\n
  • 1A sink TrueDrive gate drive output<\/li>\n
  • Programmable soft-start<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • AC-DC adapters and chargers up to 200W<\/li>\n
    • LCD TV\/Monitor bias supplies<\/li>\n
    • Off-line battery chargers<\/li>\n
    • Energy-efficient power supplies<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The UCC28600DR from Texas Instruments is an 8-pin quasi-resonant flyback green-mode PWM controller with valley switching, 130kHz max frequency, and SOIC-8 package. Key Specifications Type Quasi-Resonant Flyback Green-Mode Controller Topology Flyback, Secondary-Side Regulated Switching Frequency 40 kHz to 130 kHz Max Duty Cycle 99% Start-up Current 25 uA (max) Supply Voltage 8V to […]<\/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":[19,13],"tags":[],"chip_brand":[138],"class_list":["post-6941","post","type-post","status-publish","format-standard","hentry","category-analog-linear-ics","category-integrated-circuits-ics","chip_brand-ti"],"acf":{"brief_explanation":"QR Flyback Controller, Valley Switch, Green Mode, SOIC-8","date_code":"","package_case":"SOIC-8 (4.9 x 3.9 x 1.5 mm, 1.27mm pitch)","in_stock":7655,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/ucc28600.pdf","price":"$0.54 @ 1ku","product_introduction":"The UCC28600DR from Texas Instruments is an 8-pin quasi-resonant flyback green-mode PWM controller designed for energy-efficient off-line power supplies. The quasi-resonant (QR) operation ensures the power MOSFET switches on at the valley of the drain voltage resonance, dramatically reducing switching losses and EMI. The green-mode feature automatically reduces the switching frequency at light loads and enters burst mode at very light loads, achieving less than 50mW no-load power consumption. The 25uA maximum start-up current minimizes standby power loss through the start-up resistor. The 1A sink \/ 0.75A source TrueDrive gate drive output can directly drive large MOSFETs without an external driver. The STATUS pin can disable an external PFC stage during green-mode operation, further reducing system standby power. The device integrates comprehensive protection including line OVP, load OVP, over-temperature, cycle-by-cycle power limit, and primary-side over-current hiccup restart.","working_principle":"The UCC28600DR operates in three modes depending on the feedback voltage (VFB). When VFB is between 2.0V and 4.0V, the controller operates in quasi-resonant (QR) mode where the MOSFET turns on at the first resonant valley after transformer demagnetization, minimizing turn-on losses. The CS pin voltage is commanded between 0.4V and 0.8V, providing peak current mode control. When VFB drops to 1.4V-2.0V (medium load), frequency foldback mode reduces the switching frequency from 130kHz down to 40kHz by clamping the oscillator peak voltage. When VFB drops further to 0.5V-1.4V (light load), green-mode operation clamps the frequency at 40kHz minimum. When VFB reaches 0.5V, OUT pulses are terminated (burst mode) until VFB rises to 0.7V, creating hysteretic on\/off control. The STATUS pin becomes high-impedance during green mode, turning off the external PFC bias transistor to save power. Protection features include cycle-by-cycle current limit via the CS pin, line OVP detected through the OVP pin impedance during MOSFET on-time, and internal thermal shutdown at approximately 160C.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>VDD<\/td>Power<\/td>Supply voltage (8-21V, UVLO on at 13V\/off at 8V)<\/td><\/tr>
      2<\/td>FB<\/td>Input<\/td>Feedback voltage from optocoupler, controls operating mode<\/td><\/tr>
      3<\/td>CS<\/td>Input<\/td>Current sense input, cycle-by-cycle current limit<\/td><\/tr>
      4<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>
      5<\/td>OUT<\/td>Output<\/td>Gate drive output (1A sink, TrueDrive)<\/td><\/tr>
      6<\/td>OVP<\/td>Input<\/td>Line\/load over-voltage protection programming<\/td><\/tr>
      7<\/td>SS<\/td>Input<\/td>Soft-start programming capacitor<\/td><\/tr>
      8<\/td>STATUS<\/td>Output<\/td>Open-drain output for PFC disable (active in green mode)<\/td><\/tr><\/table>","application_scenarios":"
      • 65W USB-PD adapter with less than 50mW no-load power using QR valley switching and green mode burst operation<\/li>
      • LCD TV standby bias supply with PFC disable via STATUS pin during green-mode for sub-100mW system standby<\/li>
      • 12W battery charger with cycle-by-cycle power limit and OVP hiccup protection<\/li>
      • Industrial 24V DIN-rail power supply up to 200W with quasi-resonant switching for reduced EMI<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        TI<\/td>UCC28610DR<\/td>SOIC-8<\/td>Primary-side regulation version<\/td><\/tr>
        ST<\/td>L6565H<\/td>DIP-8\/SO-8<\/td>QR flyback, similar function<\/td><\/tr>
        Power Integrations<\/td>TOP258EN<\/td>eSIP-7C<\/td>Integrated MOSFET, higher power<\/td><\/tr>
        onsemi<\/td>NCP1237D65R2G<\/td>SOIC-8<\/td>QR controller, valley switching<\/td><\/tr>
        Infineon<\/td>ICE2QR2280Z<\/td>DSO-8<\/td>QR flyback, similar class<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6941","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=6941"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6941\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=6941"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=6941"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=6941"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=6941"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}