GR1231R Multi-Mode PWM Controller with BNO Protection Features Description Low Start-Up Current (<2uA) The GR1231R is a high performance multi-mode Multi-Mode Operation (QR/CCM) PWM controller for flyback converter. It CCM Heavy Load and Low Line minimizes the components counts and is available QR-Like Operation Medium Load in a tiny SOT-26 package. Those make it an ideal Green mode with Valley Skip at Light Load design for low cost application. It provides functions Burst Mode at No Load of low startup current, green- mode power-saving Accurate Over Current Protection operation, VCC over-voltage protection, brownout Adjustment OVP on QRD Pin protection and QRD pin abnormal conditions sensing to prevent the circuit being damaged from Brown Out Protection Output Short Protection the abnormal conditions. Soft Driver 8ms Soft-start Applications OVP (Over Voltage Protection) on Vcc Pin Switching AC/DC power adapter On Chip OTP Protection SMPS Power Supply SOT-26 Package with Few External Components Needed Typical Application Information VIN EMI FILTER VCC QRD GR1231R GND OUT CS COMP V IN 2017.08. Ver. 1.3 www.grenergy-ic.com 1 GR1231R Ordering and Marking Information GR1231R Package Code RoHS Code G: Green (Halogen Free) Device C: SOT-26 SOT-26 Code C31RX 1 X XXX Serial No. Code 2 Code 1 8 9 A B G H I J Year 2008 2009 2010 2011 2016 2017 2018 2019 Code 2 1 2 3 4 9 A B C Month Jan. Feb. Mar. Apr. Sep. Oct. Nov. Dec. Grenergy OPTO Inc. reserves the right to make changes to improve reliability or manufacture ability without notice, and advise customers to obtain the latest version of relevant information to verify before placing orders. Pin Configuration SOT-26 (TOP VIEW) 1 6 OUT GND COMP 2 5 VCC QRD 3 4 CS Pin Description Pin No. Name Function 1 GND Ground reference pin Voltage feedback pin, by connecting a photo-coupler to control the duty cycle. Input Voltage detect pin, by connecting a resistor to control the brown in 2 COMP function. 3 QRD This pin is for quasi-resonant detection, OVP and brownout protection. Current sense pin, connected to sense resistor for sensing the MOSFET 4 CS current signal 5 VCC Power supply pin 6 OUT The output driver for driving the external MOSFET 2017.08. Ver. 1.3 www.grenergy-ic.com 2