LED Driver. iW3631 Datasheet

iW3631 Driver. Datasheet pdf. Equivalent

iW3631 Datasheet
Recommendation iW3631 Datasheet
Part iW3631
Description 0-10V Dimmable Digital Off-Line LED Driver
Feature iW3631; iW3631 Two-Stage, Flickerless™ 0-10V Dimmable Digital Off-Line LED Driver with High PF and Low THD .
Manufacture Dialog Semiconductor
Datasheet
Download iW3631 Datasheet




Dialog Semiconductor iW3631
iW3631
Two-Stage, Flickerless™ 0-10V Dimmable Digital
Off-Line LED Driver with High PF and Low THD
1 Description
The iW3631 is a two-stage, high-performance AC/DC offline power supply controller for dimmable LED luminaires
with an analog dimming interface. It controls the LED current based on an analog input voltage on the dimming pin.
It has a built-in 0-10V dimming interface that works directly with 0-10V dimming systems, eliminating the need for a
driver circuit and microcontroller. It can also be implemented to support wireless SSL applications without the need
for auxiliary power supplies. The iW3631 uses Dialog’s unique digital FlickerlessTM technology to virtually eliminate all
flicker in the entire dimming range and to minimize low frequency output ripple current.
The two-stage approach allows the first-stage boost converter to convert the rectified AC voltage (90VAC to 277VAC)
to an intermediate voltage while correcting for power factor. The second-stage flyback converter then provides the
constant current regulation to the LEDs. The combination of an active start-up circuit and fast yet smooth soft-start
for both boost and flyback stages results in a start-up time (AC plug-in to 90% of set LED current) of less than a half
second and fast power factor (PF) settling time.
The iW3631 operates in a quasi-resonant mode to provide high efficiency and uses Dialog’s PrimAccurate
advanced primary-side sensing technology to achieve excellent line and load regulation without secondary feedback
components. The digital control algorithms used by the iW3631 maintain stability over all operating conditions without
the need for any external loop compensation components, minimizing the BOM cost.
2 Features
Supports universal, 90VAC-277VAC input voltage range
and output power up to 120W or above
Two-stage design (boost and flyback)
xx High PF (> 0.95) and low THD (< 10%) over entire
input voltage range and 50%-100% load current
Under 5% 100Hz/120Hz output current ripple
Quasi-resonant control for both boost and flyback
stages to achieve high efficiency
Fast yet smooth boost start-up scheme to achieve
short PF settling time
Built-in 0-10V isolation transformer driver
Wide dimming range from 1% to 100%
● Flickerless technology - removes virtually all flicker
● PrimAccurate primary-side sensing eliminates the
need for optocoupler feedback and simplifies design
Tight LED current regulation (± 5%)
Under 0.5s start-up time
Hot-plug LED module support
Multiple protection features:
Fast transient response ensures minimal bulk voltage
overshoot within the capacitor safety limit
Small size design
xx Small size input bulk capacitor
xx Small size output capacitor
xx Small transformer
3 Applications
xx LED open and short circuit protection
xx Single-fault protection
xx Over-current protection
xx Current sense-resistor-short-circuit protection
xx Input over-voltage and brown-out protection
xx Internal junction temperature-based over-
temperature protection
Dimmable LED ballast with analog input for dimming
control
Dimmable LED ballast with 0-10V interface for
dimming control
Wireless SSL lighting
Output power up to 120W or above
Product Summary
www.dialog-semiconductor.com
Rev. 1.1
1 of 7
23-January-2017
© 2017 Dialog Semiconductor



Dialog Semiconductor iW3631
iW3631
Two-Stage, Flickerless™ 0-10V Dimmable Digital
Off-Line LED Driver with High PF and Low THD
Boost
Converter
AC Input
Flyback
Converter
VOUT
1
BVSENSE
4 BDRV
14
VCB
6
ASU
3 BISENSE
iW3631
7
VCC
FDRV 10
FISENSE 11
2 VIN
AGND
9
PGND
8
TDRV
5
FVSENSE 12
DIM
13
-01
Figure 3.1 : iW3631 Analog Dimming Simplified Schematic with
Internal (-00) or External (-01) Sensing
RTN
AC Input
Boost
Converter
Flyback
Converter
VOUT
-01
1
BVSENSE
4 BDRV
14
VCB
6
ASU
3 BISENSE
iW3631
7
VCC
FDRV 10
FISENSE 11
2 VIN
AGND
9
PGND
8
TDRV
5
FVSENSE 12
DIM
13
RTN
Product Summary
www.dialog-semiconductor.com
0-10V input
Figure 3.2 : iW3631 0-10V Dimming Simplified Schematic with
Internal (-00) or External (-01) Sensing
Rev. 1.1
2 of 7
23-January-2017
© 2017 Dialog Semiconductor



Dialog Semiconductor iW3631
iW3631
Two-Stage, Flickerless™ 0-10V Dimmable Digital
Off-Line LED Driver with High PF and Low THD
AC Input
Boost
Converter
Flyback
Converter
VOUT
-01
1
BVSENSE
4 BDRV
14
VCB
6
ASU
3 BISENSE
iW3631
7
VCC
FDRV 10
FISENSE 11
2 VIN
AGND
9
PGND
8
TDRV
5
FVSENSE 12
DIM
13
RF Module
RTN
Figure 3.3 : iW3631 Wireless Dimming Simplified Schematic with
Internal (-00) or External (-01) Sensing
Product Summary
www.dialog-semiconductor.com
Rev. 1.1
3 of 7
23-January-2017
© 2017 Dialog Semiconductor







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