{"id":3187,"date":"2026-05-31T03:20:01","date_gmt":"2026-05-31T03:20:01","guid":{"rendered":"https:\/\/materialparts.com\/ncp1253bsn100t1g\/"},"modified":"2026-06-06T03:28:59","modified_gmt":"2026-06-06T03:28:59","slug":"ncp1253bsn100t1g","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/ncp1253bsn100t1g\/","title":{"rendered":"NCP1253BSN100T1G"},"content":{"rendered":"

Productos<\/h2>\n

The NCP1253BSN100T1G from onsemi is a highly integrated current-mode PWM controller designed for offline power supply applications. Housed in a compact TSOP-6 package, it operates with a fixed 100 kHz switching frequency and features auto-recovery short-circuit protection. The controller supports a supply voltage range up to 28 V and includes frequency foldback down to 26 kHz for improved light-load efficiency.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n
Switching Frequency<\/td>\n100 kHz<\/td>\n<\/tr>\n
Supply Voltage (VCC)<\/td>\n8.8 V to 28 V<\/td>\n<\/tr>\n
Topology<\/td>\nFlyback (Current Mode)<\/td>\n<\/tr>\n
OCP Type<\/td>\nAuto-Recovery<\/td>\n<\/tr>\n
Soft Start<\/td>\n4 ms (Internal)<\/td>\n<\/tr>\n
Max Duty Cycle<\/td>\n80%<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-40\u00b0C to 125\u00b0C (TJ)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • Fixed-frequency 100 kHz current-mode control operation<\/li>\n
  • Frequency foldback down to 26 kHz and skip-cycle in light load<\/li>\n
  • Adjustable ramp compensation via external resistor<\/li>\n
  • Timer-based auto-recovery short-circuit protection<\/li>\n
  • Latched over-voltage protection on VCC pin<\/li>\n
  • Frequency jittering for reduced EMI<\/li>\n
  • Internally fixed 4 ms soft-start<\/li>\n
  • Extremely low no-load standby power<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • AC-DC converters for TVs, set-top boxes, and printers<\/li>\n
    • Offline adapters for notebooks and netbooks<\/li>\n
    • Auxiliary power supplies in server and industrial systems<\/li>\n
    • Battery charger power stages<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The NCP1253BSN100T1G from onsemi is a highly integrated current-mode PWM controller designed for offline power supply applications. Housed in a compact TSOP-6 package, it operates with a fixed 100 kHz switching frequency and features auto-recovery short-circuit protection. The controller supports a supply voltage range up to 28 V and includes frequency foldback down […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[31,13],"tags":[],"chip_brand":[144],"class_list":["post-3187","post","type-post","status-publish","format-standard","hentry","category-dc-dc-converters","category-integrated-circuits-ics","chip_brand-on"],"acf":{"brief_explanation":"100 kHz current-mode PWM controller for offline flyback converters with auto-recovery OCP, TSOP-6","date_code":"","package_case":"TSOP-6 (SOT-23-6 Thin, 2.9 x 1.6 x 1.1 mm)","in_stock":8240,"datasheet":"https:\/\/www.onsemi.com\/pdf\/datasheet\/ncp1253-d.pdf","price":"$0.18 @ 1ku","product_introduction":"The NCP1253BSN100T1G is a peak current-mode PWM controller from onsemi, specifically designed for offline flyback converter topologies. Operating at a fixed switching frequency of 100 kHz, this device integrates all essential control functions in a tiny TSOP-6 package. It features frequency foldback that reduces the switching frequency to 26 kHz under light-load conditions and enters skip-cycle mode for extremely low standby power consumption. The controller includes adjustable slope compensation via an external resistor on the current sense pin, preventing sub-harmonic oscillation in continuous conduction mode. A timer-based auto-recovery short-circuit protection mechanism safeguards the converter during fault conditions, while a latched over-voltage protection on the VCC pin protects against optocoupler failure or open-loop operation. The internal 4 ms soft-start ensures controlled startup without output overshoot. Frequency jittering in both normal and foldback modes reduces EMI filter requirements.","working_principle":"The NCP1253BSN100T1G operates as a peak current-mode controller with three key subsystems: (1) The oscillator and jitter block generates the 100 kHz clock with low-frequency modulation for EMI reduction. The frequency foldback circuit reduces the switching frequency to 26 kHz when the FB pin voltage drops below a threshold, and further enters skip-cycle mode at very light loads to minimize standby power. (2) The current sense and slope compensation subsystem monitors the primary peak current through the CS pin. An external resistor in series with the sense resistor introduces slope compensation to prevent sub-harmonic oscillation in CCM operation. The leading edge blanking (LEB) suppresses turn-on spikes. (3) The protection subsystem includes a timer-based OCP that counts fault events and auto-recovers after a cool-down period, and a VCC OVP comparator that latches the converter off when VCC exceeds the threshold, protecting against output overvoltage due to optocoupler destruction.","pin_description":"
      Pin No.<\/td>Pin Name<\/td>Function<\/td><\/tr>
      1<\/td>GND<\/td>Controller ground reference<\/td><\/tr>
      2<\/td>FB<\/td>Feedback input; connect optocoupler collector for regulation<\/td><\/tr>
      3<\/td>NC<\/td>Not connected; may be grounded if needed<\/td><\/tr>
      4<\/td>CS<\/td>Current sense input with ramp compensation; monitors primary peak current<\/td><\/tr>
      5<\/td>VCC<\/td>IC supply voltage; OVP comparator monitors this pin<\/td><\/tr>
      6<\/td>DRV<\/td>Gate driver output for external MOSFET<\/td><\/tr><\/table>","application_scenarios":"
      • AC-DC flyback converters for consumer electronics (TVs, set-top boxes, printers) requiring compact design with 100 kHz switching<\/li>
      • Offline power adapters for notebooks with auto-recovery protection and low standby power under 100 mW<\/li>
      • Industrial auxiliary power supplies needing robust OVP and OCP protection in a 6-pin footprint<\/li>
      • Battery charger front-end stages where frequency jittering simplifies EMI compliance<\/li><\/ul>","alternative_models":"
        Model<\/td>Brand<\/td>Frequency<\/td>OCP Type<\/td>Package<\/td><\/tr>
        NCP1253ASN100T1G<\/td>onsemi<\/td>100 kHz<\/td>Latched<\/td>TSOP-6<\/td><\/tr>
        NCP1253BSN65T1G<\/td>onsemi<\/td>65 kHz<\/td>Auto-Recovery<\/td>TSOP-6<\/td><\/tr>
        NCP12510BSN100T1G<\/td>onsemi<\/td>100 kHz<\/td>Auto-Recovery<\/td>TSOP-6<\/td><\/tr>
        NCP1234BD65R2G<\/td>onsemi<\/td>65 kHz<\/td>Latched<\/td>SOIC-7<\/td><\/tr>
        UC3843B<\/td>Texas Instruments<\/td>Up to 500 kHz<\/td>Cycle-by-Cycle<\/td>DIP-8\/SOIC-8<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/3187","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/comments?post=3187"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/3187\/revisions"}],"predecessor-version":[{"id":3268,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/3187\/revisions\/3268"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=3187"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=3187"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=3187"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=3187"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}