IX9908 Data Sheet - Rev 2

IX9908
High Voltage, Dimmable
LED Driver with PFC Control
INTEGRATED CIRCUITS DIVISION
Features
Description
• Single Stage, Primary Control with PFC and
Dimming Features
• >90% Efficiency
• Power Factor >98%
• Wide Operating Voltage Range: Up to 600V
• Digital Soft-Start
• Cycle-by-Cycle Peak Current Control
The IX9908 is a quasi-resonant controller optimized
for phase-cut dimmable, off-line LED applications.
Precise PWM generation supports phase-cut dimming
and power factor correction.
The product features a wide operating range, up to
600V, and low power consumption. Multiple safety
features ensure full system protection in failure
situations. The IX9908, with its strong feature set and
low cost, is an excellent choice for quasi-resonant
flyback LED bulb designs.
Applications
• Incandescent Bulb Replacement
• Solid State Lighting
• Industrial and Commercial Lighting
Ordering Information
Part
Description
IX9908N
IX9908NTR
8-Pin SOIC (100/Tube)
8-Pin SOIC (2000/Reel)
IX9908 Example Application
T1
DVCC
DOUT
SNUBBER
RZCV1
AC
-
+
COUT
CZCV
CVCC
Aux
CIN
RZCV2
VCC
Q1
ZCV HV
GD
LEDs
IX9908
RIN1
RIN2
DS-IX9908-R02
VR
GND CS
CC
RCS
DVR
CVR
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1
IX9908
INTEGRATED CIRCUITS DIVISION
1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
1.2
1.3
1.4
1.5
1.6
Package Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
3
3
3
3
4
2. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Internal Supply Voltage During Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Soft-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3. Manufacturing Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1
3.2
3.3
3.4
3.5
3.6
2
Moisture Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
ESD Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Soldering Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Board Wash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Package Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Tape & Reel Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
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IX9908
INTEGRATED CIRCUITS DIVISION
1. Specifications
1.3 Pin Description
1.1 Package Pinout
Pin#
Name
1
ZCV
VCC
2
VR
Voltage Sense
3
CS
Current Sense
NC
4
GD
Gate Drive Output
5
HV
High Voltage Input
6
NC
Not Connected
7
VCC
Controller Power Supply
8
GND
Controller Ground
ZCV
1
8
GND
VR
2
7
CS
GD
3
6
4
5
HV
Zero Crossing
1.4 Recommended Operating Range
1.2 Absolute Maximum Ratings
Parameter
Description
Note: Within the recommended operating range, the
IC operates as described in the functional description.
Symbol
Ratings
Unit
HV Voltage
VHV
600
V
VCC Supply Voltage
VCC
-0.3 to 40
V
VR Voltage
VVR
-0.3 to 5
V
ZCV Voltage
VZC
-0.3 to 5
V
VCC Supply Voltage
CS Voltage
VCS
-0.3 to 5
V
Junction Temperature
GD Voltage
VOUT
-0.3 to 40
V
Maximum Current from ZCV Pin
IZCmax
3
mA
Junction Temperature
TJ
- 40 to +125
°C
Storage Temperature
TSTG
- 55 to +150
°C
Absolute maximum electrical ratings are at 25°C.
Limit Values
Parameter
Symbol
Unit
Min
Max
VCC
10.5
18
V
TJ
- 25
+ 125
°C
1.5 Thermal Characteristics
Parameter
Thermal Impedance
(Junction to Ambient)
Symbol
Rating
Units
JA
125
°C/W
Absolute maximum ratings are stress ratings.
Stresses in excess of these ratings can cause
permanent damage to the device. Functional
operation of the device at conditions beyond those
indicated in the operational sections of this data sheet
is not implied.
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3
IX9908
INTEGRATED CIRCUITS DIVISION
1.6 Electrical Characteristics
TJ = - 25°C to +125°
1.6.1 Power Supply
Note: The electrical characterization involves the spread of values within the specified supply voltage and junction
temperature range TJ from - 25°C to +125°C. Typical values represent the median values, which are related to 25°C.
If not otherwise stated, a supply voltage of VCC=18V is assumed.
Parameter
VCC Charge Current
Maximum Input Current of Startup Cell
Leakage Current of Startup Cell
Supply Current in Normal Operation
VCC Turn-On Threshold
VCC Turn-Off Threshold
VCC Turn-On/Off Hysteresis
Conditions
Symbol
Minimum
Typical
Maximum
VCC=0V
ICCcharge1
Unit
-
-
35
VCC=VCCon -0.2V
ICCcharge2
-
-
35
VCC=VCCon -0.2V
IHV
-
-
35
VHV=610V @ TJ=100°C
IHV
-
0.2
50
A
GD Low
ICCNM
-
1.8
2.9
mA
-
VCCon
17
18
19
V
-
VCCoff
9.8
10.5
11.2
V
-
VCChys
-
7.5
-
V
mA
mA
1.6.2 Internal Voltage Reference
Parameter
Internal Reference Voltage
Conditions
Symbol
Minimum
Typical
Maximum
Unit
Measured at VR Pin, IVR=0
VVR
4.8
5
5.2
V
1.6.3 PWM Section
Conditions
Symbol
Minimum
Typical
Maximum
Unit
VR Pull-Up Resistor
Parameter
-
RVR
14
23
33
k
PWM-OP Gain
-
GPWM
2.95
3
3.05
-
Offset for Voltage Ramp
-
VPWM
0.63
0.7
0.77
V
Maximum On-Time in Normal Operation
-
tonMax
22
30
41
s
Conditions
Symbol
Minimum
Typical
Maximum
Unit
Current Sense Threshold
-
VCSTH
0.97
1.03
1.09
V
Leading Edge Blanking Time
-
tBLKCS
200
330
460
ns
Conditions
Symbol
Minimum
Typical
Maximum
Unit
1.6.4 Current Sense
Parameter
1.6.5 Soft Start
Parameter
Soft-Start Time
-
tSS
8.5
12
-
ms
Soft-Start Time Step
-
tSS-S
-
3
-
ms
Internal Regulation Voltage at First Step
-
VSS1
-
1.76
-
V
Internal Regulation Voltage Step at Soft Start
-
VSS-S
-
0.56
-
V
4
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IX9908
INTEGRATED CIRCUITS DIVISION
1.6.6 Foldback Point Correction
Conditions
Symbol
Minimum
Typical
Maximum
Unit
ZCV Current First Step Threshold
Parameter
-
IZC_FS
0.35
0.5
0.621
mA
ZCV Current Last Step Threshold
IZC = 2.3 mA, VVR = 3.0V
IZC_LS
1.3
1.85
2.3
mA
VCSMF
-
0.66
-
V
Conditions
Symbol
Minimum
Typical
Maximum
Unit
-
VZCCT
50
100
170
mV
VZCRS
-
0.7
-
V
Minimum Ringing Suppression Time
VZC > VZCRS
tZCRS1
1.62
2.5
4.5
s
Maximum Ringing Suppression Time
VZC < VZCRS
tZCRS2
-
42
-
s
-
tOffMax
30
42
57.5
s
Symbol
Minimum
Typical
Maximum
Unit
CS Threshold Minimum
1.6.7 Digital Zero Crossing
Parameter
Zero Crossing Voltage
Ringing Suppression Threshold
Maximum Restart Time in Normal Operation
1.6.8 Protection
Parameter
Conditions
VCC Overvoltage Threshold
-
VCCOVP
24
25
26
V
Output Overvoltage Detection Threshold at the ZCV Pin
-
VZCVOVP
3.55
3.7
3.87
V
s
Blanking Time for Output Overvoltage Protection
-
tZCVOVP
-
100
-
Threshold for Short Winding Protection
-
VCSSW
1.60
1.68
1.78
V
Blanking Time for Short Winding Protection
-
tCSSW
-
190
-
ns
Over-Temperature Protection
-
TJTSP
-
140
-
°C
Symbol
Minimum
Typical
Maximum
Unit
1
V
V
1.6.9 Gate Drive
Parameter
Conditions
Output Voltage at Logic Low
VCC=18V, IOUT=10mA
VGATElow
-
-
Output Voltage at Logic High
VCC=18V, IOUT= -10mA
VGATEhigh
9
10
-
VCC=9V, IOUT=10mA
VGATEasd
-
-
1
V
Rise Time
COUT=1nF, VGD=2V to 8V
trise
-
117
-
ns
Fall Time
COUT=1nF, VGD=8V to 2V
tfall
-
27
-
ns
Output Voltage Active Shut-Down
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IX9908
INTEGRATED CIRCUITS DIVISION
2. Functional Description
Vcc
Ringing
Suppress
Blanking
ZCV
High Voltage
Startup
HV
Gate
Control
GD
Vcc
Vcc Monitor
Over - Under
Voltage Lockout
Reference Voltage
Generator
Over-Voltage Protection
Leading
Edge
Blanking
Foldback
Sense Amp
Control
Logic
Over-Temp
Sensor
Soft-Start
Control
Foldback
Correction
VR
Shorted Winding Detection
LPF
Analog
Mux
GND
Leading
Edge
Blanking
CS
Leading
Edge
Blanking
PFC
Figure 1. IX9908 Block Diagram
2.1 Internal Supply Voltage During Start-Up
The IX9908 integrates a high voltage startup cell. This
cell provides a constant current to charge the VCC
capacitor (CVCC) during the Power-up phase of
operation. Once the main input voltage is applied, a
rectified voltage will be across CIN.
VVCC_on
VVCC_off
The start-up cell will sense this voltage, and source a
constant current of approximately 10 mA to CVCC. This
current will remain until VCC reaches VVCC_on or 18V
nominal. It will then be switched off, and a soft start
sequence will begin. VCC will then sag as the CVCC
capacitor supplies current to power the device, and is
not yet receiving energy from the auxiliary winding.
Once the output voltage is high enough the auxiliary
winding will provide energy to CVCC and the VCC
voltage will reach a constant value. This value
depends on the output load and transformer
characteristics.
tstartup =
tstartup
VCC_on • CVCC
ICC_CHARGE
Figure 2. Start-Up
6
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IX9908
INTEGRATED CIRCUITS DIVISION
2.2 Soft-Start
Once VCC reaches VVCC_on (typically 18V), the device
will initiate a soft-start sequence. This is intended to
minimize the electrical stresses on Q1, DOUT, DVCC,
and the transformer. The soft-start operates as shown
in Figure 3. The duration of this soft-start is 12mS
nominal and steps VCS, the current sense voltage, to
four values, as shown.
VCS_SST (V)
Maximum Current (Sense Voltage)
During Soft-Start
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
suppression circuit is implemented. The suppression
time has two values that depend on the voltage at
ZCV. If VZCV is greater than 0.7V, then the time is
2.5S nominal. If VZCV is less than 0.7V, then the time
is 42S nominal. Turn-on of Q1 can not occur during
the suppression time, but does occur after a
zero-crossing is detected. In the case of a missed
zero-crossing, a maximum off-time is implemented.
After Q1 has been off for 42S nominal (toffMax), it is
turned back on.
2.3.2 Switch-Off Determination
In the application circuit, the primary current is sensed
by RCS. The voltage across this resistor, VCS, is
applied to the CS input of the device. It is processed
internally, and compared to the voltage at the VR pin,
which is a scaled version of the rectified line voltage.
When the following relation is true, the power switch,
Q1, is turned off.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Time (ms)
 V CS  3  + 0.7V  VR
Figure 3. Soft-Start
Leading-edge blanking is used to prevent a false
trigger caused by the voltage spike across RCS at the
moment of Q1 turn-on. This blanking time, tBLKCS , is
nominally 330nS. To prevent transformer saturation, a
maximum on-time circuit is implemented. Max on-time
for Q1 (GD=H) is 30S nominal.
2.3 Normal Operation
Because the IX9908 employs quasi-resonant
operation, its PWM switch-on is set by the zero
crossing of the auxiliary winding voltage, and the
switch-off is set by the current sense voltage.
2.3.1 Zero Crossing & Switch-On Determination
As the application schematic on Page 1 shows, the
voltage from the auxiliary winding is connected to the
zero crossing pin, ZCV, through an RC network. This
network provides a delay so that switch-on can occur
at voltage valley thus enhancing efficiency. The
required time delay, t, should be approximately
one-fourth of the oscillation period (determined by
transformer primary inductor and drain-source
capacitance of Q1) minus the propagation delay from
zero-cross detect to Q1 switch-on, tdelay .
t
t = OSC - tdelay
4
This time delay, t, should be matched by adjusting
the RC network.
tRC = CZCV (RZCV1 // RZCV2)
After Q1 is turned off, its VDS will show some
oscillation. This will also show on the ZCV input. To
avoid a mis-triggered Q1 turn-on, a ringing
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IX9908
INTEGRATED CIRCUITS DIVISION
2.3.3 Foldback Point Correction
2.3.4 Protection Functions
When the AC line voltage increases, the Q1 on-time
decreases, which increases the operating frequency.
As a result, with a constant primary current limit, the
output power increases. To provide output power
regulation with respect to line voltage, the internal
foldback point correction circuit varies the VCS limit.
The VCS limit is decreased in response to an increase
in AC line voltage. The relationship between VCSMax
and VIN is shown in Figure 4.
Variation of VCS Limit Voltage
With Respect to VIN
1.1
Fault Condition
Output Over-Voltage
Shorted Winding
Over-Temperature
VCC Over-Voltage
VCC Under-Voltage
Action Taken
GD Latched Off
GD Latched Off
Auto-Restart Mode
Auto-Restart Mode
Auto-Restart Mode
OUTPUT OVER-VOLTAGE
During the Q1 off-time the auxiliary winding voltage
(VAUX) will swing positive and in proportion to the
secondary voltage. VAUX is connected to ZCV through
a resistor divider. If the voltage at ZCV exceeds a
preset threshold (VZCVOVP) for longer than the blanking
time (tZCVOVP), then the IC is latched off.
1.0
VCSMax (V)
The IX9908 provides comprehensive protection
features. They are summarized in the table below:
0.9
0.8
0.7
0.6
50
100
150
200
250 300
VIN (V)
350
400
SHORTED WINDING
450
If the voltage at CS exceeds a preset threshold
(VCSSW) during Q1 on time the device is latched off.
Figure 4. VCSMax vs. VIN
The variation in AC line voltage is sensed by way of
the auxiliary winding and an internal clamp and
current sense circuit. When Q1 is on, a negative
voltage proportional to the line voltage is coupled to
the auxiliary winding; the IC will hold the ZCV pin very
close to ground during this time. The line voltage is
thus sensed indirectly through the current in RZCV1.
This current is given by:
IZCV =
VIN • Na
RZCV1 • Np
The device uses IZCV to vary the VCS limit as shown in
Figure 4. The actual implementation is digital and is
shown below:
VCS vs. IZC
1.05
If the die temperature exceeds 140°C, then the device
will enter the Auto-Restart Mode.
VCC OVER-VOLTAGE / UNDER-VOLTAGE
The IC continuously monitors the VCC voltage. In case
of an over-voltage, Q1 is turned off (GD=L) and VCC
will begin to fall. Once VCC goes below VVCC_off (10.5V
nominal), the startup circuit is activated, and begins to
charge CVCC. When VCC exceeds VVCC_on (18.0V
nominal), the device initiates a new soft-start. For an
under-voltage the operation is the same except that
the sequence begins with VCC < VVCC_off so GD=L and
the startup circuit is activated. This operation
describes the Auto-Restart Mode.
During Latch-Off Mode, VCC also cycles between
VVCC_off and VVCC_on, but GD remains low, and no
soft-start is initiated. The line voltage must be turned
off and on again to begin normal operation.
1.00
0.95
0.90
VCS (V)
OVER-TEMPERATURE
0.85
0.80
0.75
0.70
0.65
0.60
200
600
1000
1400
IZC (µA)
1800
2200
Figure 5. VCS vs. IZC
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IX9908
INTEGRATED CIRCUITS DIVISION
3. Manufacturing Information
3.1 Moisture Sensitivity
All plastic encapsulated semiconductor packages are susceptible to moisture ingression. IXYS Integrated
Circuits Division classified all of its plastic encapsulated devices for moisture sensitivity according to the
latest version of the joint industry standard, IPC/JEDEC J-STD-020, in force at the time of product
evaluation. We test all of our products to the maximum conditions set forth in the standard, and guarantee
proper operation of our devices when handled according to the limitations and information in that standard as well as
to any limitations set forth in the information or standards referenced below.
Failure to adhere to the warnings or limitations as established by the listed specifications could result in reduced
product performance, reduction of operable life, and/or reduction of overall reliability.
This product carries a Moisture Sensitivity Level (MSL) rating as shown below, and should be handled according to
the requirements of the latest version of the joint industry standard IPC/JEDEC J-STD-033.
Device
Moisture Sensitivity Level (MSL) Rating
IX9908N
MSL 1
3.2 ESD Sensitivity
This product is ESD Sensitive, and should be handled according to the industry standard
JESD-625.
3.3 Soldering Profile
This product has a maximum body temperature and time rating for lead-free reflow processes as shown below. All
other guidelines of J-STD-020 must be observed.
Device
Maximum Temperature x Time
IX9908N
260°C for 30 seconds
3.4 Board Wash
IXYS Integrated Circuits Division recommends the use of no-clean flux formulations. However, board washing to
remove flux residue is acceptable, and the use of a short drying bake may be necessary. Chlorine-based or
Fluorine-based solvents or fluxes should not be used. Cleaning methods that employ ultrasonic energy should not be
used.
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9
IX9908
INTEGRATED CIRCUITS DIVISION
3.5 Package Dimensions
1.27
(0.050)
3.80 - 4.00
(0.150 - 0.157)
Note 4
5.80 - 6.20
(0.228 - 0.244)
5.40
(0.213)
Dimensions
mm MIN - mm MAX
(inches MIN - inches MAX)
Pin 1
0.31 - 0.51
(0.012 - 0.020)
x8
1.27
(0.05)
6x
4.80 - 5.00
(0.189 - 0.197)
Note 3
1.25 MIN
(0.049 MIN)
1.55
(0.061)
0.60
(0.024)
Recommended PCB Land Pattern
0.10 - 0.25
(0.004 - 0.010)
0.10 - 0.25
(0.004 - 0.010)
0º - 8º
0.40 - 1.27
(0.016 - 0.050)
1.75 MAX
(0.069 MAX)
A
0.25 (0.010)
Gauge Plane
Seating Plane A
NOTES:
1. All dimensions are in mm (inches).
2. This package conforms to JEDEC Standard MS-012, Variation AA, Rev. F.
3. Dimension does not include mold flash, protrusions, or gate burrs. Mold flash, protrusions, or gate burrs shall not exceed 0.15mm per end.
4. Dimension does not include interlead flash or protrusion. Interlead flash or protrusion shall not exceed 0.25mm per side.
5. Pin location tolerance = 0.10mm, pin tolerances are non-cumulative.
6. Dimensions in inches are calculated from mm, and are provided for convenience.
3.6 Tape & Reel Dimensions
330.2 DIA.
(13.00 DIA.)
Top Cover
Tape Thickness
0.102 MAX.
(0.004 MAX.)
W=12.00
(0.472)
B0=5.30
(0.209)
K0= 2.10
(0.083)
A0=6.50
(0.256)
P=8.00
(0.315)
User Direction of Feed
Embossed Carrier
Embossment
Dimensions
mm
(inches)
NOTE: Tape dimensions not shown comply with JEDEC Standard EIA-481-2
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IXYS Integrated Circuits Division makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication and
reserves the right to make changes to specifications and product descriptions at any time without notice. Neither circuit patent licenses or indemnity are expressed
or implied. Except as set forth in IXYS Integrated Circuits Division’s Standard Terms and Conditions of Sale, IXYS Integrated Circuits Division assumes no liability
whatsoever, and disclaims any express or implied warranty relating to its products, including, but not limited to, the implied warranty of merchantability, fitness for a
particular purpose, or infringement of any intellectual property right.
The products described in this document are not designed, intended, authorized, or warranted for use as components in systems intended for surgical implant into
the body, or in other applications intended to support or sustain life, or where malfunction of IXYS Integrated Circuits Division’s product may result in direct physical
harm, injury, or death to a person or severe property or environmental damage. IXYS Integrated Circuits Division reserves the right to discontinue or make changes
to its products at any time without notice.
Specifications: DS-IX9908-R02
© Copyright 2015, IXYS Integrated Circuits Division
All rights reserved. Printed in USA.
10/2/2015
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www.ixysic.com
R02