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Dialog Semiconductor |
iW3623
AC/DC Digital Power Controller for
High Power Factor Dimmable LED Drivers
1 Description
The iW3623 is a high-performance AC/DC off-line power supply controller for LED
luminaires. The iW3623 combines power factor correction and LED current regulation into
one controller. It achieves PF > 0.95 and THD < 10% for 100–277VAC input voltage range.
The iW3623 operates in quasi-resonant mode to provide high efficiency. The device uses
Dialog’s advanced PrimAccurate™ primary-side sensing technology to achieve excellent
line and load regulation without a secondary-feedback circuit. In addition, the iW3623’s
pulse-by-pulse waveform analysis technology allows accurate LED current regulation. The iW3623 maintains stability
over all operating conditions without the need for loop compensation components.
2 Features
●● Isolated AC/DC off-line LED driver
●● Power factor > 0.95 for wide input voltage range
100 – 277VAC
●● Total harmonic distortion (THD) < 10%
●● Under 5% 100Hz/120Hz output current ripple
●● Resonant control to achieve high efficiency
●● LED current foldback with external NTC
●● Small size design
xx Small size input bulk capacitor
xx Small size output capacitor
xx Small transformer
●● PrimAccurate™ primary-side sensing eliminates the
need for optocoupler feedback and simplifies design
●● Tight LED current regulation ± 5%
●● Under 0.5 second start-up time
●● Hot-plug LED module support
●● Multiple protection features:
xx LED open circuit protection
xx Single-fault protection
xx Over-current protection
xx LED short-circuit protection
xx Current sense-resistor-short-circuit protection
xx Input over-voltage and brown-out protection
3 Applications
●● Non-dimmable LED lamps and luminaires
●● Optimized for up to 45W output power
Product Summary
www.dialog-semiconductor.com
Rev. 1.6
1 of 6
25-May-2016
© 2016 Dialog Semiconductor
iW3623
AC/DC Digital Power Controller for
High Power Factor Dimmable LED Drivers
AC Input
Boost
Converter
Flyback
Converter
VOUT
1
BVSENSE
4 BDRV
14
VCB
6
ASU
3 BISENSE
iW3623
7
VCC
FDRV 10
FISENSE 11
2 VIN
AGND
9
PGND
8
CFG
5
FVSENSE 12
VT
13
NTC
Figure 3.1 : iW3623 Typical Application Circuit
RTN
Product Summary
www.dialog-semiconductor.com
Rev. 1.6
2 of 6
25-May-2016
© 2016 Dialog Semiconductor
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