EV1221_S0_R0 Controller for Adaptive 100/120Hz Current Ripple Removing Circuit
●DESCRIPTION
■JW1221 uses for removing the 100/120Hz LED current ripple on AC/DC power.
■The adaptive technology of JW1221 ensures minimum power dissipation on NMOSFET while removing LED current ripple.
■JW1221 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 30V.
■JW1221 allows user to setup maximum LED current by the sensing resistor between the source of NMOSFET and ground, which keeps NMOSFET damaged when LED short connected or hot-plug.
■By sensing the drain voltage of NMOSFET via a resistor between the drain and VLMT pin, JW1221 allows user to setup the maximum cathode voltage of LED string, which could help limit the power dissipation on chip.
■It’s considered that LED is shorted when the cathode voltage of LED is higher than short connecting threshold and remains over 0.5 second. JW1221 shuts down NMOSFET when LED is shorted.
■JW1221 provides over thermal protection. When OTP is trigged, the current removing function is blocked, and then the temperature decreases.
●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
■SOT23-6L Package
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[ LED lighting ] |
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Datasheet |
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Please see the document for details |
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TO-252;SOT23-6;DO-41 |
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English Chinese Chinese and English Japanese |
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2019/06/17 |
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Rev.0.8 |
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397 KB |
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