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PDF IW3602 Data sheet ( Hoja de datos )
| Número de pieza | IW3602 | |
| Descripción | AC/DC Digital Power Controller | |
| Fabricantes | Dialog Semiconductor | |
| Logotipo |  |
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iW3602
AC/DC Digital Power Controller for
Dimmable LED Drivers
1.0 Features
2.0 Description
●● Isolated AC/DC offline 100VAC/230VAC LED driver
●● Line frequency ranges from 45Hz to 66Hz
●● Intelligent wall dimmer detection
xx Leading-edge dimmer
xx Trailing-edge dimmer
xx No-dimmer detected
xx Unsupported dimmer
●● Hybrid dimming scheme
●● Wide dimming range from 1% up to 100%
The iW3602 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 iW3602’s unique digital control technology
eliminates visible flicker.
The iW3602 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.
●● No visible flicker
●● Resonant control to achieve high efficiency, 85% without
dimmer
●● Temperature compensated LED current
●● Small size design
xx Small size input bulk capacitor
xx Small size output capacitor
xx Small transformer
The iW3602 operates in a quasi-resonant mode to provide
high efficiency. The iW3602 provides a number of key
built-in features. The iW3602 uses advanced primary-
side sensing technology to achieve excellent line and load
regulation without secondary feedback circuitry. In addition,
the iW3602’s pulse-by-pulse waveform analysis technology
allows accurate LED current regulation. The iW3602
maintains stability over all operating conditions without the
need for loop compensation components. Therefore, the
iW3602 minimizes external component count, simplifies EMI
design and lowers overall bill of materials cost.
●● Primary-side sensing eliminates the need for opto-
isolator feedback and simplifies design
3.0 Applications
●● Tight LED current regulation ± 5%
●● Dimmable LED luminaires
●● Fast start-up, typically 10µA start-up current
●● Optimized for 3W to 10W output power
●● 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 Over-temperature protection
xx Input over-voltage protection
●● Up to 10W output power
iW3602
Datasheet
Rev. 1.0
1 of 19
© 2015 Dialog Semiconductor (UK) Ltd.
1 page  
iW3602
AC/DC Digital Power Controller for
Dimmable LED Drivers
6.0 Electrical Characteristics (cont.)
VCC = 12V, -40°C ≤ TA ≤ 85°C, unless otherwise specified (Note 1)
Parameter
Symbol
Test Conditions
Shutdown threshold (Note 4)
VSH-TH
Input leakage current
IIN(VT)
VT = 1.0V
Pull-up current source
IVT
OUTPUT(TR) SECTION (Pin 1)
Output low level ON-resistance
RDS-TR(ON)LO
ISINK = 5mA
Output high level ON-resistance
RDS-TR(ON)HI
ISOURCE = 5mA
Min Typ Max Unit
0.22 V
1 µA
90 100 110 µA
100 Ω
200 Ω
Notes:
Note 1. Adjust VCC above the start-up threshold before setting at 12V.
Note 2. These parameters are not 100% tested. They are guaranteed by design and characterization.
Note 3. Operating frequency varies based on the line and load conditions, see Theory of Operation for more details.
Note 4. These parameters refer to digital preset values, and they are not 100% tested.
iW3602
Datasheet
Rev. 1.0
5 of 19
© 2015 Dialog Semiconductor (UK) Ltd.
5 Page 
iW3602
AC/DC Digital Power Controller for
Dimmable LED Drivers
Start-up
Sequencing
ig _
peak (t)
=
vg (t) × tON
LM
(9.7)
VIN
VCC(ST)
This current represents a stored energy of:
E=g
LM
2
× ig _ peak (t)2
(9.8)
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 Q1
directly drawn
conducts during
from rectified vg(t).
tON(t), the current
The energy Eg(t) is
ig(t) is
stored
in the magnetizing inductance LM. The rectifying diode D1 is
reversely biased and the load current IO is supplied by the
secondary
the stored
ecnaepragcyitoErg(Ct)Oi.sWdheelivneQre1dtutorntshoeffo,uDtp1 ucto.nducts
and
iin(t)
vin(t)
+ ig(t)
vg(t)
–
TS(t)
N:1 id(t) VO
D1
+
CO
IO
VAUX
VAUX
Q1
Figure 9.8 : Simplified Flyback Converter
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)
In order to tightly regulate the output voltage, the information
about the output voltage and load current must 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, the load current
is supplied from the output
across LM is vg(t), assuming
filter
the
capacitor CO. The voltage
voltage dropped 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 ramps up to:
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 is a
fixed ΔV. 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 is also small. With the
iW3602, ΔV can be ignored.
The real-time waveform analyzer in the iW3602 reads the
auxiliary waveform information cycle by cycle. The part then
generates a feedback voltage VFB. The VFB signal precisely
iW3602
Datasheet
Rev. 1.0
11 of 19
© 2015 Dialog Semiconductor (UK) Ltd.
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet IW3602.PDF ] | |
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