SQ9920-AN03
ACHI080003NQNN20
3W LED Driver Module using SQ9920 with low BoM- GU10
AC Input Voltage Range
180V
AC
/50Hz ~ 264V
AC
/50Hz
LED DC Output Voltage/Current
80V/30mA
Output Power
2.4W
Key Features
Input from 180V
AC
/50Hz to 264V
AC
/50Hz, LED DC 80V/30mA output
Fixed frequency 65kHz buck converter and maximum efficiency > 81%
Peak current mode control and LED output current variation within ±3%
Built-in EMI solution (optional)
Minimum Bill of Material (BOM) for as few as 7 or 9(with EMI) external components
Dimension : 26mm
×
15mm
×
10mm
Typical application : GU10 lighting
Introduction
This application note describes a constant current power
module with high integration for full range input voltage
from 180V
AC
~ 264V
AC
by adopting the SQ9920. Based
on buck topology, the SQ9920 is able to achieve high
current accuracy for lighting application. This application
provides multiple advanced fault protections to enhance
the systems safety, including natural open loop
protection, V
DD
under-voltage lockout and thermal shut
down. All protections have auto-restart mechanisms.
Schematics, PCB Gerber, BOM, as well as typical
performance are covered in details by this application
note. A complete application circuit is depicted in Figure
4, which can work on input voltage range from 180V
AC
~
264V
AC
.
BOM
BOM is shown in Table 3 on page 4.
PCB Layout
The PCB layout has dimension at 26mm
×
15mm
×
1.6mm
in order to fit candle light space.
Power Module Photo
Pictures of power module and key components are shown
in Figure 5 and 6.
Specification
The Table 1 contains the specification that this design
intends to achieve.
Performance
It is to drive output at 80V/30mA targeting to achieve
high efficiency (η
MAX
> 81%) for AC input voltage range
180V
AC
~ 264V
AC
. Actual performance is shown on Table
2. Figure 1, 2 and 3 depict output current, current
variation and efficiency at AC input voltage range
180V
AC
~ 264V
AC
for this module that system designer
can adopt it to achieve corresponding performance.
© 2009 Sequoia Microelectronics Corp.
ACHI080003CQDN20 V0.1
-1-
Rev. 0.1
2014, Apr. 14
DSP 与 ARM 处理器
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