JW1221A

JW1221A Controller for Adaptive 100/120Hz Current Ripple Removing Circuit Parameters Subject to Change Without Notice DESCRIPTION JW1221A is a controller for driving external NMOSFET to remove the 100/120Hz LED current ripple on AC/DC power by a capacitor between VC and GND. The adaptive technology of JW1221A ensures minimum power dissipation on NMOSFET while removing LED current ripple. JW1221A clamps the input voltage on VIN pin by 30V. Only one resistor is needed when the output voltage of AC/DC power is higher than the VIN clamp threshold. JW1221A allows user to setup maximum LED current by the sensing resistor between the source of NMOSFET and ground, which protects NMOSFET from being damaged when LED short connected or hot-plug. By sensing the drain voltage of NMOSFET via a resistor between the drain and VLMT pin, JW1221A allows user to setup the maximum cathode voltage of LED string, which could help limit the power dissipation on chip. It is considered that LED is shorted when the cathode voltage of LED is higher than short connecting threshold and remains over 60us. Company’s Logo is Protected, “JW” and “JOULWATT” are Registered JW1221A shuts down NMOSFET when LED is shorted and recovers after 800ms. JW1221A provides over thermal protection. When the temperature of JW1221A exceed 145 , OTP is trigged. JW1221A releases the current ripple until the temperature decrease to 120 . ℃ ℃ FEATURES








Controller for adaptive 100/120Hz current ripple remover Built-in zener diode for input voltage clamping VG output voltage high to 10V Programmable amplitude of LED current ripple Programmable maximum cathode voltage of LED Programmable maximum LED current Short protection Over temperature protection SOT23-6 Package APPLICATIONS
LED lighting Trademarks of JoulWatt technology Inc. TYPICAL APPLICATION JW1221A Rev.0.3 JoulWatt Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 1 JW1221A JoulWatt ORDER INFORMATION TOP LEAD FREE FINISH TAPE AND REEL PACKAGE ： Note MARKING JW1221ASOTB#PBF JW1221ASOTB#TRPBF SOT23-6 JWC7 PIN CONFIGURATION TOP VIEW ABSOLUTE MAXIMUM RATING1） VIN clamp voltage................................................................................................................................ 31V VG ..................................................................................................................................................... 20V VS, VC, VLMT ....................................................................................................................... -0.3V to 6V Junction Temperature2 )3).................................................................................................................. 150ºC Lead Temperature ............................................................................................................................ 260ºC Storage Temperature ....................................................................................................... -65ºC to +150ºC RECOMMENDED OPERATING CONDITIONS Junction Temperature (TJ)................................................................................................... -40ºC to 125ºC THERMAL PERFORMANCE4） θJA θJc SOT23-6 .............................................................................................................................220 ...130ºC/W ： Note 1) 2) 3) 4) Exceeding these ratings may damage the device. The JW1221A guarantees robust performance from -40°C to 150°C junction temperature. The junction temperature range specification is assured by design, characterization and correlation with statistical process controls. The JW1221A includes thermal protection that is intended to protect the device in overload conditions. Thermal protection is active when junction temperature exceeds the maximum operating junction temperature. Continuous operation over the specified absolute maximum operating junction temperature may damage the device. Measured on JESD51-7, 4-layer PCB. JW1221A Rev.0.3 JoulWatt Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2 JW1221A JoulWatt ELECTRICAL CHARACTERISTICS VIN = 12V, TA = 25ºC, unless otherwise stated. Item Symbol VIN clamp voltage VIN_CLP VIN operation current IIN VIN startup voltage threshold VIN_ST VIN UVLO threshold VIN_UVLO Maximum VG output voltage VVG VC startup current IVCST Condition 17V