LED LCD LED Driver at work

Still use the old LCD CCFL lamp using Backlight Inverter module to turn it on, then the LED LCD using LED DRIVER module called to light a number of " rentengan Diode LED "
LED Driver has two main parts , namely

• DC - DC Converter ( Buck Boost Inverter )
• Led - FET Drivers
  Just as CCFL Inverter , then Led module connector driver has control consisting of :
• supply Vcc
• BL -on
• PDIM
• Protek -out
• Gnd

We give examples Led Driver LG 32LE450

IC Led driver Kontroler

Module gets 24v dc supply voltage from the power supply
24v voltage is then increased by using the " Buck Boost Inverter " into a higher dc voltage ( for each model of the magnitude of the voltage is not the same ) to turn a LED diode ( this model has 4 pieces of dc - dc converter ) .
Some Diode Led diseri thus be some " rentengan diode LED " ( this model has 4 pieces rentengan diode LED ) .
Each rentengan diode led directly connected to the voltage ( + ) dc supply .
For directions ground each an LED diode rentengan passed out on a FET driver , whose function is to regulate " LED diode lighting " ( so a total of 4 pieces FET driver )

Occupational settings controlled by a controller IC Led Driver functioning among others as :

Generating pulses Buck Boost Converter ( dc - dc converter )
Generating pulses of FET driver ( PDIM )
Control over voltage protector ( voltage dc - dc converter over )
Control output short protector ( voltage dc - dc converter otput short )
Control output protector open ( rentengan diode LED broken or not flame )

VIN received input voltage of the power supply

-L1 , D1 , Q1 , C0 is a dc-dc converter circuit
-Q2 is used to control the amount of current ( light - dark ) rentengan diode LED .
-Pin - OVP is shorted sensor and output overvoltage which will result in the driver HV9911 does not -work if the output overvoltage or short .
-Pin - FDBK an LED diode current sensor rentengan that the flame is stable . And a sensor "Protek " -if that would result in the driver stops working if rentengan HV9911 LED is not lit ( no one that led to death )
-If the driver HV9911 does not work , then the output at D1 equal to the voltage Vin .
-If the driver HV9911 has worked as it gets orders from Backlight -on , the GATE pin will be issued
-pulses . Flow -shaped pulses will flow through the inductor L1 and fet Q1 , which will produce high
voltage induced in the high L1.Tegangan of L1 then be rectified by D1 to fill Capasitor Co.

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