台电C430+开机无背光 ，内部升压IC 2093发烫，怀疑此IC损坏，经网上查询到此IC的详细型号为EMD2093
详细参数如下：
The
EMD2093
designed
with
high
efficiency
step
up
DC/DC
converter
for
driving
white
LEDs.
The
device
can
drive
up
8
white
LEDs
from
a
single
Li-Ion
battery
or
a
DC
power
2.5V
to
5.5V.
The
EMD2093
uses
current
mode
and
pulse-width
modulated
(PWM)
operation.
It
switches
at
1.2MHz
and
allows
using
small
inductor
and
both
of
input/output
capacitors.
An
internal
c
o
mpensation
can
reduce
external
c
o
mponent.
The
EMD2093
include
under-voltage
lockout,
current
limit,
over
voltage
and
thermal
shutdown
protection.
The
EMD2093
is
available
in
SOT-26
package.
Features
WLEDs
supports:
Up
to
8-LEDs
support
at
VIN=3.7V
Up
to
40mA
current
support
at
VIN=3.7V
Low
Quiescent
Current:
55
μA
Over
Voltage
Protection:
30V
Inherently
Matched
LED
Current
Shutdown
Current
<
1μA
Reference
Voltage
0.245V
Efficiency
:
85%
(Typ)
at
VIN=5.0V
PWM
Dimming
Control
Internal
Soft
Start
and
Compensation
800mA
Internal
power
MOSFET
Switch
Low
Profile
SOT-26
Package
Applications
Mobile
Phone
Digital
Still
Cameras
Portable
applications
GPS
Receivers
由于此型号IC比较难找，不知道此IC能否找到替代品，还请各位大侠帮帮忙，小弟先在这里谢过各位了！
[ 此帖被lvcha在2011-12-07 02:30重新编辑 ]
