ON Semiconductor Is Now To learn more about onsemi, please visit our website at www.onsemi.com onsemi andand other names, marks, and brands are registered and/or common law trademarks of Semiconductor Components Industries, LLC dba onsemi or its affiliates and/or subsidiaries in the United States and/or other countries. onsemi owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of onsemi product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. onsemi reserves the right to make changes at any time to any products or information herein, without notice. The information herein is provided as-is and onsemi makes no warranty, representation or guarantee regarding the accuracy of the information, product features, availability, functionality, or suitability of its products for any particular purpose, nor does onsemi assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using onsemi products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by onsemi. Typical parameters which may be provided in onsemi data sheets and/ or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including Typicals must be validated for each customer application by customers technical experts. onsemi does not convey any license under any of its intellectual property rights nor the rights of others. onsemi products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use onsemi products for any such unintended or unauthorized application, Buyer shall indemnify and holdo nsemi and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that onsemi was negligent regarding the design or manufacture of the part. onsemi is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. Other names and brands may be claimed as the property of others. KA7552A/KA7553A SMPS Controller Features Description Built-in drive circuits for direct connection power The KA7552A/KA7553A are switching power control IC MOSFET (l = 1.5A) for wide operating frequency range. The internal circuits O Wide operating frequency range (5kHz ~ 600kHz) include pulse by pulse current limiting, protection, on/off Pulse by pulse over current limiting control by external trigger, low standby current, soft start, Over load protection and high current totempole output for driving a POWER On/off control by external trigger MOSFET. Maximum duty of the KA7552A is 70% and the Internal UVLO KA7553A is 46%. When duty is maximum, the input Low standby current (typ. 90uA) threshold voltage of pin2 & pin8 are not same in KA7552A Soft start circuit and KA7553A. 8-DIP 1 Internal Block Diagram CS C R V T T CC 8 1 6 7 10uA 0.56 ~ 0.42V + OSC + 7V - UVLO BIAS OFF (4V) 3.6V + - 5 2.8V - + 4.3K OUTPUT 2.4V - PWM - 1.9V R 0.24V Q O.C.P S + 2 4 3 GND FB IS(+) 2004 Semiconductor Components Industries, LLC. Publication Order Number: October-2017, Rev. 2 KA7553A/D