DESCRIPTIONMT7636 is a controller for removing the
100/120Hz LED current ripple on high PF
pre-driver circuit. The adaptive technology of
MT7636 ensures minimum power dissipation
while removing LED current ripple.
MT7636 can drive a single LED string with the
external MOSFET. MT7636 clamps the input
voltage on VDD pin by 15V, and clamps the
internal maximum current by 15mA. Only one
resistor is connected between VDD and Vin+,
when the clamping current is too high, which is
caused by large input voltage (exceeding 15V).
MT7636 can flexibly adjust LED peak current by
the sensing resistor between the MOSFET
source and ground, which avoids the LED and
the MOSFET damaged when LED short
connected or hot plug.
With built-in temperature compensation, the
system automatically adjusts the current ripple at
high temperature to reduce MOSFET power
dissipation and ensures system reliability.
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