SELC2010M Просмотр технического описания (PDF) - MagnaChip Semiconductor
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SELC2010M Datasheet PDF : 15 Pages
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Preliminary – Subject to change without notice
The programmable SCP voltage can be set up in reference to 5V
VREF in the equation below.
VISET
=
5* R2
R1+ R2
Therefore, the SCP level can be decided by selecting the resistor
value of RLED, R1 and R2.
The timer circuit operates as the configuration of both comparator of
1V/3V Input, IAUTO=5uA (typical) and external capacitor CAUTO and
the restart time can be calculated in the following equation.
TAR
=
2 * CAUTO
I AUTO
= 4e + 5 * CAUTO
Figure 7 Programmable short current protections
SCP Circuit uses very fast comparator in order to turn off MOSFET
when the abnormal condition of SCP Level is detected. Because
high current can be driven into channel of MOSFET when LED
string is shorted.
It is recommended to use additional ISET Cs capacitor in order to
prevent abnormal SCP which is caused by noise
Figure 9 Auto Restart Protection timing diagram
On Auto-Restart Protection status, it makes restart signal of internal
single pulse when the voltage of AUTO Pin is high threshold. In this
case, it is recovered to normal operating mode if SCP or OVP
condition is cleared. While charging AUTO pin, it recover protection
when next restart signal occurs even though protection condition is
cleared.
6. Auto-Restart Protection
The MAP3201 offers Auto Restart protection function which is
recovered into normal operation mode when protection condition is
cleared
Dimming Control
1. LED Current
The MAP3201 decides LED Current setting by the value of RLED
resistance which has been sensing the voltage of positive input FBP
Pin of gm Amp. and LED current (VFBP)
Figure 8 Auto Restart Protection circuit
Figure 8 shows auto restart protection circuit that shuts off the
output of GATE switching and PWMO if protection signal is
assigned to control logic circuit under OVP or SCP condition.
OCT.15 2009. Version 0.3
Figure 10 LED Current Setting
MagnaChip Semiconductor Ltd.
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