The following is the circuit diagram of [UC3843/5 application circuit] UC384X does not include input undervoltage, soft start and overload detection
The external implementation cost of these features is $0.07
The NCP1252 includes all of these features to reduce costs and increase reliability. 
60V20Ah Lithium Ion Battery,Waterproof Battery Pack For Bicycle,60V 20Ah L-Ion Waterproof Battery,Rechargeable 60V Lifepo4 Lithium Battery
Jiangsu Zhitai New Energy Technology Co.,Ltd , https://www.jszhitaienergy.com