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PDF iW3610 Data sheet ( Hoja de datos )
| Número de pieza | iW3610 | |
| Descripción | AC/DC Digital Power Controller | |
| Fabricantes | iWatt | |
| Logotipo |  |
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iW3610
AC/DC Digital Power Controller for Dimmable LED Drivers
1.0 Features
2.0 Description
●● Isolated AC/DC offline 100 Vac / 230 Vac
●● Line frequency ranges from 47 Hz to 64 Hz
●● Intelligent wall dimmer detection
xx Leading-edge
xx Trailing-edge
xx No-dimmer detected
xx Unsupported dimmer
●● Hybrid dimming scheme
●● Wide dimming range from 2% up to 100%
●● No visible flicker
●● Resonant control to achieve high efficiency, 85% without
dimmer
●● Meets Harmonic Requirement, high power factor (0.9)
without dimmer
●● Temperature control to adjust LED brightness
●● Small size design
xx small size input bulk capacitor
xx small size output capacitor
xx smallest transformer
●● Primary-side sensing eliminates the need for opto-
isolator feedback and simplifies design
The iW3610 is a high performance AC/DC offline power
supply controller for dimmable LED luminaires, which uses
advanced digital control technology to detect the dimmer
type and phase. The dimmer conduction phase controls
the LED brightness. The LED brightness is modulated by
PWM-dimming. The dimming frequency is selectable via
product options. iW3610’s unique digital control technology
eliminates visible flicker.
iW3610 can operate with all dimmer schemes including:
leading-edge dimmer, trailing-edge dimmer, as well as
other dimmer configurations such as R-type, R-C type or
R-L type. When a dimmer is not present, the controller can
automatically detect that there is no dimmer.
iW3610 operates in quasi-resonant mode to provide high
efficiency. Also the iW3610 provides a number of key
built-in features. Since the iW3610 uses iWatt’s advanced
primary-side sensing technology, it achieves excellent line
and load regulation without secondary feedback circuitry.
In addition, iW3610’s pulse-by-pulse waveform analysis
allows for accurate LED current regulation. The iW3610
also maintains stability over all operating conditions without
the need for loop compensation components. Therefore, the
iW3610 minimizes external component count, simplifies EMI
design and lowers overall bill of materials cost.
3.0 Applications
●● Dimmable LED luminaires
●● Tight LED current regulation ± 5%
●● Fast start-up, typically 10 µA start-up current
●● Up to 45 W
●● Precise LED current control
iW3610
●● Multiple protection features:
xx LED open protection
xx Single-fault protection
xx Over-current protection
xx LED short circuit protection
xx Current sense resistor short protection
xx Over-temperature protection
Rev. 1.5
iW3610
February 1, 2012
Page 1
1 page  
iW3610
AC/DC Digital Power Controller for Dimmable LED Drivers
6.0 Electrical Characteristics (cont.)
VCC = 12 V, -40°C ≤ TA ≤ 85°C, unless otherwise specified (Note 1)
Parameter
Symbol Test Conditions
ISENSE SECTION (Pin 6)
Over current limit threshold
Isense short protection reference
CC regulation threshold limit (Note 2)
VOCP
VRSNS
VREG-TH
VT SECTION (Pin 4)
Shutdown threshold (Note 2)
Input leakage current
Pull up current source
VSH-TH
IBVS
ISD
VSD = 1.0 V
OUTPUT(TR) SECTION (Pin 1)
Output low level ON-resistance
Output high level ON-resistance
RDS-TR(ON)LO
RDS-TR(ON)HI
ISINK = 5 mA
ISOURCE = 5 mA
Min
1.83
90
Typ
1.89
0.16
1.8
0.09
100
100
200
Max Unit
1.95 V
V
V
V
1 µA
110 µA
Ω
Ω
Notes:
Note 1. Adjust VCC above the start-up threshold before setting at 12 V.
Note 2. These parameters are not 100% tested, guaranteed by design and characterization.
Note 3. Operating frequency varies based on the line and load conditions, see Theory of Operation for more details.
Rev. 1.5
iW3610
February 1, 2012
Page 5
5 Page 
iW3610
AC/DC Digital Power Controller for Dimmable LED Drivers
Start-up
Sequencing
VIN
VCC(ST)
VCC
ENABLE
Figure 9.7 : Start-up Sequencing Diagram
9.6 Understanding Primary Feedback
Figure 9.8 illustrates a simplified flyback converter. When the
switch
drawn
Q1 conducts
from rectified
dsiunruinsgoitdONv(gt()t,).thTeheceunrerergnyt
igE(tg)(t)isisdsirteocretldy
in the magnetizing inductance LM. The rectifying diode D1 is
reverse biased and the load current IO is supplied by the
secondary capacitor CO.
and the stored energy
When
Eg(t) is
Q1 turns off,
delivered to
D1 conducts
the output.
iin(t)
+ ig(t)
N:1 id(t) VO
vin(t)
vg(t)
–
D1 +
CO
VAUX
VAUX
IO
TS(t)
Q1
Figure 9.8 : Simplified Flyback Converter
In order to tightly regulate the output voltage, the information
about the output voltage and load current needs to be
accurately sensed. In the DCM flyback converter, this
information can be read via the auxiliary winding or the
primary magnetizing inductance (LM). During the Q1 on-time,
tThheelovaodltacguerreancrtoissssuLpMpilsievdg(ftr)o, mastshuemoiuntgputhtefilvteorltcaagpeadcritooprpCeOd.
across Q1 is zero. The current in Q1 ramps up linearly at a
rate of:
dig (t) = vg (t)
dt LM
(9.6)
At the end of on-time, the current has ramped up to:
ig _
peak (t)
=
vg (t) × tON
LM
(9.7)
This current represents a stored energy of:
E=g
LM
2
× ig _ peak (t)2
(9.8)
When Q1 turns off, ig(t) in LM forces a reversal of polarities on
all windings. Ignoring the communication-time caused by the
leakage inductance LK at the instant of turn-off, the primary
current transfers to the secondary at a peak amplitude of:
id =(t )
NP
NS
× ig _
peak
(t)
(9.9)
Assuming the secondary winding is master and the auxiliary
winding is slave.
VAUX
=
VO
x
NAUX
NS
VAUX
0V
VAUX
=
-VIN
x
NAUX
NP
Figure 9.9 : Auxiliary Voltage Waveforms
The auxiliary voltage is given by:
=VAUX
N AUX
NS
(VO
+ ∆V )
(9.10)
and reflects the output voltage as shown in Figure 9.9.
The voltage at the load differs from the secondary voltage by
a diode drop and IR losses. The diode drop is a function of
current, as are IR losses. Thus, if the secondary voltage is
always read at a constant secondary current, the difference
between the output voltage and the secondary voltage will
be a fixed ΔV. Furthermore, if the voltage can be read when
the secondary current is small; for example, at the knee of
the auxiliary waveform (see Figure 9.9), then ΔV will also be
small. With the iW3610, ΔV can be ignored.
The real-time waveform analyzer in the iW3610 reads the
auxiliary waveform information cycle by cycle. The part then
generates a feedback voltage VFB. The VFB signal precisely
represents the output voltage and is used to regulate the
output voltage.
Rev. 1.5
iW3610
February 1, 2012
Page 11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet iW3610.PDF ] | |
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