Adaptive 100/120Hz Current Ripple Remover
With High Voltage MOSFET Integrated
Parameters Subject to Change Without Notice
JW1237, integrated with 150V NMOSFET, is used
to drive a LED string, and remove the 100/120Hz
LED current ripple on AC/DC power by a capacitor
between VC and GND.
The adaptive technology ensures minimum power
dissipation on JW1237 while removing LED
JW1237 clamps the input voltage on VIN pin to
31V. Only one resistor is needed when the output
voltage of AC/DC power is higher than 31V.
JW1237 allows user to setup maximum LED
current by the sensing resistor between VS pin
and GND, which protects JW1237 from being
damaged when LED short connected or hot-plug.
By sensing the voltage of LED- pin via a resistor
between LED- pin and VLMT pin, JW1237 allows
users 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 180us
JW1237 shuts down when LED is shorted and
recovers after 12ms.
℃JW1237 provides over thermal protection. When
the temperature of JW1237 exceed 135 , OTP is
℃trigged. JW1237 shuts down until the temperature
decrease to 110 .
Adaptive 100/120Hz current ripple remover
150V high voltage NMOSFET integrated
Built-in zener diode for input voltage
VG output voltage high to 10V
Programmable amplitude of LED current
Programmable maximum cathode voltage of
Programmable maximum LED current
Over temperature protection
JoulWatt Proprietary Information. Patent Protected.
Unauthorized Photocopy and Duplication Prohibited.