Power Controller. iW3617 Datasheet

iW3617 Controller. Datasheet pdf. Equivalent

iW3617 Datasheet
Recommendation iW3617 Datasheet
Part iW3617
Description AC/DC Digital Power Controller
Feature iW3617; iW3617 AC/DC Digital Power Controller for High Power Factor Dimmable LED Drivers 1.0 Features ●● Is.
Manufacture iWatt
Datasheet
Download iW3617 Datasheet




iWatt iW3617
iW3617
AC/DC Digital Power Controller for
High Power Factor Dimmable LED Drivers
1.0 Features
Isolated/non-isolated offline 120VAC/230VAC LED driver
up to 25W output power
Wide line frequency ranges (from 45Hz to 66Hz)
Meets IEC61000-3-2 requirement
Total harmonic distortion < 15% with PF > 0.95
Wide dimmer compatibility
xx Leading-edge dimmer
xx Trailing-edge dimmer
xx Digital dimmer
xx Occupancy sensors and timers
Under 20% output ripple current
Wide dimming range from 1% to 100%
FlickerlessTM LED dimming
Resonant control to achieve high efficiency
(typical > 85% without dimmer)
Over-temperature LED current foldback
Small solution size
xx Two-stage topology enables small-size input and
output filter capacitors
xx 200kHz maximum switching frequency enables
small transformer
xx Intelligent dimmer interface eliminates dedicated
high-power bleeder
Primary-side sensing eliminates the need for
opto-isolator feedback
Tight LED current regulation (± 5%)
Fast start-up (< 0.5s without dimmer)
Supports hot-plug LED module (Zhaga)
Compatible with NEMA SSL6 dimming curve standard
Supports wide LED output voltage range
Multiple protection features:
xx LED open-circuit and short-circuit protection
xx Over-current and over-temperature protection
xx Current sense resistor short-circuit protection
xx AC line over-voltage/-frequency protection
2.0 Description
The iW3617 is a two-stage, high-performance AC/DC offline
power supply controller for dimmable LED luminaires. It
applies advanced digital control technology to detect the
dimmer type and phase, which provides dynamic impedance
to interface the dimmer and control the LED brightness
at the same time. The iW3617 uses iWatt’s unique digital
FlickerlessTM technology to eliminate visible flicker in the
entire dimming range and minimize low frequency output
ripple current.
With advanced dimmer detection technology, the iW3617
can operate with most wall dimmers including leading-edge
dimmers (R-type or R-L type) and trailing-edge dimmers (R-C
type). In addition, the iW3617’s cycle-by-cycle waveform
analysis technology allows fast dimmer setting response.
When no dimmer is on the line, the iW3617 optimizes the
power factor and minimizes the current harmonic distortion
to the AC line.
The iW3617 operates the main power converter that delivers
constant current to the LED load in quasi-resonant mode to
provide high power efficiency and minimize electro-magnetic
interference (EMI). It uses iWatt’s patented PrimAccurateTM
primary-side sensing technology to achieve excellent LED
current regulation under different AC line and LED load
voltages, without using a secondary-side feedback circuit
and eliminating the need for an opto-coupler.
The iW3617 minimizes the external components count by
simplifying the EMI filter with iWatt’s EZ-EMI® technology. The
intelligent dimmer detection technology eliminates the need
for a high-power bleeder. Additionally, the digital control loop
of the iW3617 maintains stable overall operating conditions
without the need for loop compensation components.
3.0 Applications
Dimmable LED retrofit lamps up to 25W
Dimmable LED ballast and luminaries up to 25W
Rev. 0.3
iW3617
Preliminary
September 14, 2012
Page 1



iWatt iW3617
iW3617
AC/DC Digital Power Controller for
High Power Factor Dimmable LED Drivers
Booster
Converter
AC Input
Flyback
Converter
VOUT
1
BVSENSE
4 BDRV
14
VCB
6
ASU
3 BISENSE
iW3617
7
VCC
FDRV 10
FISENSE 11
2 VIN
AGND
9
PGND
8
CFG
5
FVSENSE 12
VT
13
NTC
Figure 3.1 : iW3617 Simplified Schematic
RTN
Rev. 0.3
iW3617
Preliminary
September 14, 2012
Page 2



iWatt iW3617
iW3617
AC/DC Digital Power Controller for
High Power Factor Dimmable LED Drivers
4.0 Pinout Description
iW3617
1 BVSENSE
VCB 14
2 VIN
VT 13
3 BISENSE
FVSENSE 12
4 BDRV
5 CFG
FISENSE 11
FDRV 10
6 ASU
AGND 9
7 VCC
PGND 8
Pin #
1
2
3
4
5
Name
BVSENSE
VIN
BISENSE
BDRV
CFG
Type Pin Description
Analog Input Boost inductor voltage feedback input
Analog Input Rectified AC line voltage input
Analog Input Boost current sense input
Output
Base drive output for boost BJT
Analog In/Out Driver parameter configuration pin and auxiliary driver
6 ASU
Output
Active start-up and bleeder control
7 VCC
8 PGND
Power
Ground
Power supply for control logic and voltage sense for power-on reset circuit
Power ground
9 AGND
Ground Signal ground. It should be connected to the power ground on PCB.
10 FDRV
Output
Gate drive output for flyback MOSFET
11
FISENSE
Analog Input Flyback current sense (used for cycle-by-cycle peak current control and limit)
12
FVSENSE
Analog Input Flyback voltage sense (used for primary-side regulation and ZVS)
13
VT
Analog Input
External power limit shutdown control and external over-temperature power
derating
14 VCB Analog Input Boost output voltage feedback input
Rev. 0.3
iW3617
Preliminary
September 14, 2012
Page 3







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