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On Semiconductor UC3842AN Voltage Mode Modulator Control Circuit SMD PWM Controller IC: Amazon.com: Industrial & Scientific
IIVVERR UC3843B Voltage Mode Modulator Control Circuit PWM Controller SOIC (UC3843B Circuito de control de modulador de modo de voltaje PWM Controlador SOIC - - Amazon.com
OB2263AP Current Mode PWM Control IC,Low Power Switching Power Supply IC,0B2263AP : Amazon.ca: Industrial & Scientific
10pcs/lot UC2842 DIP-8 UC2842BN Current Mode PWM Controllers New Original: Amazon.com: Industrial & Scientific