{"id":1490,"date":"2022-06-29T08:28:47","date_gmt":"2022-06-29T08:28:47","guid":{"rendered":"https:\/\/smdelectro.com\/?post_type=product&p=1490"},"modified":"2022-10-28T13:06:23","modified_gmt":"2022-10-28T13:06:23","slug":"uc3843st-soic14","status":"publish","type":"product","link":"https:\/\/smdelectro.com\/index.php\/product\/uc3843st-soic14\/","title":{"rendered":"UC3843ST SOIC14"},"content":{"rendered":"
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All features<\/h3>\n
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  • LOW START-UP AND OPERATING CURRENT<\/li>\n
  • UNDERVOLTAGE LOCKOUT WITH HYSTERESIS<\/li>\n
  • INTERNALLY TRIMMED REFERENCE WITH UNDERVOLTAGE LOCKOUT<\/li>\n
  • CURRENT LIMITING<\/li>\n
  • TRIMMED OSCILLATOR FOR PRECISE FREQUENCY CONTROL<\/li>\n
  • CURRENT MODE OPERATION TO 500kHz<\/li>\n
  • OSCILLATOR FREQUENCY GUARANTEED AT 250kHz<\/li>\n
  • LATCHING PWM FOR CYCLE-BY-CYCLE<\/li>\n
  • HIGH CURRENT TOTEM POLE OUTPUT<\/li>\n
  • AUTOMATIC FEED FORWARD COMPENSATION<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
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    The UC284xB family of control ICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off-state.<\/p>\n

    Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC2842B and UC2844B have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC2843B and UC2845B are 8.5V and 7.9V. The UC2842B and UC2843B can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC2844B and UC2845B by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.<\/p>\n<\/div>\n<\/div>\n

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    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"featured_media":1548,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[42],"product_tag":[],"class_list":{"0":"post-1490","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-stmicroelectronics","8":"first","9":"instock","10":"shipping-taxable","11":"product-type-simple"},"yoast_head":"\nUC3843ST SOIC14 - SMD Electro<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/smdelectro.com\/index.php\/product\/uc3843st-soic14\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"UC3843ST SOIC14 - SMD Electro\" \/>\n<meta property=\"og:description\" content=\"The UC284xB family of control ICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off-state. Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC2842B and UC2844B have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC2843B and UC2845B are 8.5V and 7.9V. The UC2842B and UC2843B can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC2844B and UC2845B by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/smdelectro.com\/index.php\/product\/uc3843st-soic14\/\" \/>\n<meta property=\"og:site_name\" content=\"SMD Electro\" \/>\n<meta property=\"article:modified_time\" content=\"2022-10-28T13:06:23+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/smdelectro.com\/wp-content\/uploads\/2022\/06\/so-14_4.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"560\" \/>\n\t<meta property=\"og:image:height\" content=\"560\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/smdelectro.com\\\/index.php\\\/product\\\/uc3843st-soic14\\\/\",\"url\":\"https:\\\/\\\/smdelectro.com\\\/index.php\\\/product\\\/uc3843st-soic14\\\/\",\"name\":\"UC3843ST SOIC14 - 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