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PDF iW3630 Data sheet ( Hoja de datos )
| Número de pieza | iW3630 | |
| Descripción | AC/DC Digital Power Controller | |
| Fabricantes | iWatt | |
| Logotipo |  |
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iW3630
AC/DC Digital Power Controller for High Power
Factor Analog and 0-10V Dimmable LED Drivers
1.0 Features
●● Isolated/non-isolated offline 100VAC/277VAC LED driver
controller
●● Meets IEC61000-3-2 requirements
●● Total harmonic distortion < 15% with Power Factor >
0.95
●● Analog input dimming level control
●● Built-in 0-10V isolation transformer driver
●● Under 10% output ripple current
●● Wide dimming range from 1% to 100%
●● FlickerlessTM LED dimming technology
●● Quasi-resonant control to achieve high efficiency
(typical > 85%)
●● Small size
xx Two-stage topology enables small-size input and
output filter capacitors
xx 200kHz maximum switching frequency enables
small transformer
●● Primary-side sensing eliminates the need for
opto-isolator feedback
●● Tight LED current regulation
●● Supports wide LED output voltage range
●● Multiple protection features:
xx LED open-circuit and short-circuit protection
xx Over-current protection
xx Current sense resistor short-circuit protection
xx AC line over-voltage/frequency protection
2.0 Description
The iW3630 is a two-stage, high-performance AC/DC offline
power supply controller for dimmable LED luminaires with
analog dimming interface. It controls LED current based on
analog input voltage on the dimming pin. It also has a built-in
0-10V isolation transformer driver which can work directly
with 0-10V dimming system without adding extra driver
circuit and micro-controller. The iW3630 uses iWatt’s unique
digital FlickerlessTM technology to eliminate visible flicker
in the entire dimming range and to minimize low frequency
output ripple current.
The iW3630 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 iW3630 minimizes the external components count by
simplifying the EMI filter with iWatt’s EZ-EMI® technology.
Additionally, the digital control loop of the iW3630 maintains
stability over all operating conditions without the need for
loop compensation components.
3.0 Applications
●● Dimmable LED ballast with analog input for dimming
control
●● Dimmable LED ballast with 0-10V interface for dimming
control
●● Output power up to 45W
Rev. 0.6
iW3630
Preliminary
Page 1
1 page  
iW3630
AC/DC Digital Power Controller for High Power
Factor Analog and 0-10V Dimmable LED Drivers
6.0 Electrical Characteristics
VCC = 12 V, -40°C ≤ TA ≤ 85°C, unless otherwise specified (Note 1)
Parameter
Symbol Test Conditions
VIN SECTION
Start-up voltage threshold (Note 2)
Brown-out voltage threshold (Note 3)
Over-voltage shutdown threshold
Input impedance
VIN_ST
VBR_TH
VIN_OVP
ZIN
TA= 25°C
TA= 25°C
TA = 25°C
After start-up
VIN range
VIN frequency range
VIN
fIN TA= 25°C
VCB SECTION
Over-voltage shutdown threshold
Input impedance
VCB range
FVSENSE SECTION
Input leakage current
Normal voltage threshold
Output OVP threshold (default)
BVSENSE SECTION
Input leakage current
FDRV SECTION
Output low level ON-resistance
Output high level ON-resistance
Maximum switching frequency (Note 4)
VCB_OVP
ZCB
VCB
TA = 25°C, positive edge
After start-up
IBVS(FVSENSE)
VSENSE(NOM)
VSENSE(MAX)
VSENSE = 2V
TA= 25°C, negative edge
TA= 25°C, negative edge
IBVS(BVSENSE)
VSENSE = 0.1V
RDS_ON_LO(FDRV)
RDS_ON_HI(FDRV)
fSW_FDRV(MAX)
ISINK = 5mA
ISOURCE = 5mA
BDRV SECTION
Output low level ON-resistance
Maximum switching frequency (Note 5)
ASU SECTION
RDS_ON_LO(BDRV)
fSW_BDRV(MAX)
ISINK = 5mA
if VIN_A < 130mV
if VIN_A > 130mV
Resistance between VCC and ASU
RVCC_ASU
Min Typ Max Unit
1.512
0
47
0.283
0.283
1.68
15
1.848
1.8
63
V
V
V
kW
V
Hz
1.62 1.8 1.98
V
15 kW
0 1.8 V
1.521
1.683
1.536
1.7
1
1.551
1.717
µA
V
V
1 µA
16 W
25 W
200 kHz
1W
200 kHz
90 kHz
830 kW
Rev. 0.6
iW3630
Preliminary
Page 5
5 Page 
iW3630
AC/DC Digital Power Controller for High Power
Factor Analog and 0-10V Dimmable LED Drivers
The flyback converter is operated in discontinuous
conduction mode (DCM). When the flyback MOSFET
turns on, the transformer primary winding current ramps
up linearly and energy builds up in the transformer. The
iW3630 turns off the MOSFET when the primary winding
current reaches the peak current regulation level. At this
moment, the transformer maintains the magnetic flux so
that the energy in the transformer generates the secondary
winding current that equals the peak primary winding current
multiplied by the primary-secondary turns-ratio. Then the
secondary winding current ramps down linearly until all the
energy in transformer is discharged. After the energy in
the transformer is discharged, the iW3630 starts the next
switching cycle. The LED load current is the average of the
saw-tooth shaped secondary winding current.
The LED load current can be determined by an equation as
shown below.
IOUT = 0.5 × NTR × IPK × TR / TP
(9.1)
where IPK is the peak of primary winding current. NTR is the
primary-secondary turns ratio. TR is the secondary winding
current ramp-down time, or the transformer reset time. TP is
the entire switching period.
The IPK is determined by the voltage generated on the
current-sense resistor: IPK = VPK / RS. Therefore, the equation
can be written as:
IOUT = 0.5 × NTR / RS × (VPK × TR / TP)
(9.2)
The iW3630 measures TR and TP on a cycle-by-cycle basis
and controls VPK so that the KCC = VPK × TR / TP is always
a constant. The KCC is an internally defined constant that
equals to 0.7V. Therefore, IOUT can be determined by the
turns-ratio and current sense resistor at the design time of
the application circuit.
9.4.2 Dimming Control
The iW3630 has two dimming scheme options depending on
the dimming level.
From 100% to 25% ouput current dimming range, the iW3630
employs the same constant current regulation algorithm as
described in section 9.4.1 while reducing the KCC constant.
As a result, the IOUT will proportionally decrease as the KCC
decreases. In this process, the switching frequency of the
flyback converter will increase. The maximum switching
frequency is clamped at 200kHz.
voltage and increases the switching period TP to achieve
further dimming.
9.5 Protection Features
This section provides information about iW3630 protection
features.
9.5.1 Output Over-Voltage/LED Open Protection
The iW3630 includes a function that protects against an
output over-voltage.
The output voltage is monitored by the FVSENSE pin. The ratio
between the FVSENSE pin voltage and output voltage is equal
to the transformer auxiliary to secondary winding turns-ratio
multiplied by the FVSENSE resistor divider ratio. If the voltage
at the FVSENSE pin exceeds VSENSE(MAX), the iW3630 shuts
down immediately. After the shutdown, the iW3630 remains
powered on, which discharges the VCC. In order to avoid
over-charging the output voltage, the iW3630 employs an
extended discharge time as described below.
Under the fault condition, the iW3630 tries to
start up three consecutive times. If all three
start-up attempts fail, the iW3630 enters inactive mode,
during which the iW3630 does not respond to the VCC
power-on requests. The iW3630 is activated again after it
sees 29 start-up attempts. The iW3630 can also be reset
to the initial condition if the VCC is completely discharged.
Typically, this extended discharge time is around three to
five seconds, and allows the iW3630 to support hot-plug
LED modules without causing output over-voltage while
allowing a quick recovery when the fault is removed.
9.5.2 Output Short Protection
The iW3630 includes a function that protects against an
output short-circuit fault.
If the voltage at the FVSENSE pin is below 0.228V, the iW3630
shuts down immediately. After the shutdown, the iW3630
remains powered on, which discharges the VCC. In order
to avoid excessive power stress due to auto-restart, the
iW3630 employs an extended discharge time (as described
in Section 9.5.1).
To support applications with large output capacitance, output
short protection is not activated during the initial LED current
soft start period. This allows the voltage to build up in the
output capacitor without triggering the protection.
Below 25% output current dimming range, the iW3630
switches to the PFM mode, which keeps the peak regulation
Rev. 0.6
iW3630
Preliminary
Page 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet iW3630.PDF ] | |
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