EVB RT8497AGS-00 EN

CONFIDENTIAL
RT8497A Evaluate Report
for Non-isolation Floating
Buck LED Driver (Internal T8)
May. 2016
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RT8497A Brief Introduction
RT8497A is a active power factor correction controller,
specifically designed for using as a constant current
LED driver.
Supporting : Non-isolation(Buck mode)
Applications
AC/DC LED lighting driver
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RT8497A Features
High Efficiency BCM LED Driver Controller for
High Power Factor Offline Applications
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•
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Built-in Power MOSFET
High Power Factor and THDi
Constant LED current with Highly Precision Current regulation
Extremely Low Quiescent Current Consumption.
True Low System BOM Cost
Unique Programmable AND pin for ZVS Setting to Achieve
Best power Efficiency
Universal Input Voltage Range with Off-Line Topology
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RT8497A Advantage
• Tight LED Current Regulation
• Low BOM Cost
• Protection:
a. Built-in Over Thermal Protection
b. Built-in Over Voltage Protection
c. Output LED String Open protection
d. Output LED String Short protection
e. Output LED Over Current protection
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Circuit
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Electrical Performance
Load: LED Series
Frequency
Vac [V]
60Hz
90
60Hz
100
60Hz
110
60Hz
132
50Hz
195
50Hz
220
50Hz
230
50Hz
240
50Hz
264
current regulation =
△ Effiency =
Maximum PFC =
Minimum PFC =
Line filter on
Pin [watt]
Vout[V]
Iout[mA]
Pout [watt]
Total Eff. [%]
PF Value
THD [%]
19.108
19.045
19.023
19.043
19.234
19.299
19.303
19.328
19.415
1.38%
2.13%
0.961
0.909
78.70
78.60
78.60
78.60
78.50
78.50
78.50
78.50
78.50
222
223
223
224
225
225
224
224
224
17.448
17.496
17.544
17.630
17.647
17.631
17.600
17.592
17.560
91.31%
91.87%
92.22%
92.58%
91.75%
91.36%
91.18%
91.02%
90.45%
0.909
0.932
0.945
0.959
0.961
0.951
0.946
0.939
0.921
44.88
37.92
33.39
27.03
19.18
18.44
18.41
18.49
19.20
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Efficiency
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Power Factor
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Current Regulation
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Temperature (Test Condition: Burn-in 30min. @ Ta=25 ℃)
90Vac/60Hz input
F1
Fuse, MST, T2A/300V
CX1
X-cap, HQX, 104/250V
LX2
DR0912, 3mH
D1~D4
GS1M (1A/1000V)
Film cap, 224/450V
C2
U1
RT8497A
C1
1206, 2.2nF/630V
C5
1206, 4.7uF/50V
R7,R10
1206, 2.2 ohm
D6
ES1J (1A/600V)
ZD1
BZT55C30 (30V, 0.5W)
D7
SF28 (2A/600V)
L1 (core)
EFD-15, 450uH
L1 (wire)
EC1
E-cap, 100uF/100V
26.8
32.7
50.7
53.2
44.7
63.3
49.2
49.3
52.5
48.5
53
49.2
47.5
48.1
28.5
264Vac/50Hz input
F1
Fuse, MST, T2A/300V
CX1
X-cap, HQX, 104/250V
LX2
DR0912, 3mH
D1~D4
GS1M (1A/1000V)
Film cap, 224/450V
C2
U1
RT8497A
C1
1206, 2.2nF/630V
C5
1206, 4.7uF/50V
R7,R10
1206, 2.2 ohm
D6
ES1J (1A/600V)
ZD1
BZT55C30 (30V, 0.5W)
D7
SF28 (2A/600V)
L1 (core)
EFD-15, 450uH
L1 (wire)
EC1
E-cap, 100uF/100V
22.6
27.8
37.1
50.1
46.6
72.3
52.1
53.2
61.1
59.5
68.2
59.4
70.4
71.4
48.7
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PCB Layout
TOP Layer
BOT Layer
PCB No : PCB071_V1
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Demo Board Photo
L
LED-
N
LED+
Length
Width
Height
123mm
16mm
12mm
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BOM
Item
Location
Value
Type
1
CX1
0.1uF/275Vac
CFS-12X12
2
C1
2.2nF/1kV
C1206
3
C2
0.22uF/450V
CFS-11X10-H1
4
C4
0.1uF
C0805
5
C5
4.7uF/50V
C1206
6
C7
100pF/1kV
C1206
7
D1, D2, D3, D4
GS1M
D-SMA
8
D6
SF18
D-SOD123
9
D7
SF28/DO-15
DIODE4-12MM
10
EC1
100uF/100V
11
F1
1.6A/300V
12
LX2
3mH/DR-0912
CES-10X23-H1
FUSE-SS-5F-2P5.08
LDS-D8X10
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BOM
Item
Location
Value
Type
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L1
450uH
LT-EFD15
14
RX1
5.1k
R1206
15
R1, R2
511k
R1206
16
R5
200k
R0805
17
R6
10R
R0805
18
R7
2R
R1206
19
R8
22R
R1206
20
R9
100k
R1206
21
R10
2R2
R1206
22
U1
RT8497AGS
SOP-8
23
VR1
TVR07471
VR-7-5MM
24
ZD1, ZD2
30V
D-SOD123
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Transformer
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Power Component Voltage Stress
Test condition: 264Vac/50Hz input , 78V/230mA output
Stead state
Location
Max rating (V)
Measure
De-rating
U1 (Vds)
500
412
82.4%
D7
600
416
69.3%
Transient State
Location
Max rating (V)
Measure
De-rating
U1 (Vds)
500
464
92.8%
D7
600
412
68.7%
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Start up waveform
Vac_in = 90V
T_start up =790ms
Vac_in = 264V
T_start up =336ms
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Harmonic(IEC61000-3-2)
230Vac input
Class C : Pass
Class D : Pass
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EMI-Conduction(1)
110Vac/60Hz-LPass
(9kHz~150kHz)
110Vac/60Hz-L Pass
(150kHz~30MHz)
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EMI-Conduction(2)
110Vac/60Hz-NPass
(9kHz~150kHz)
110Vac/60Hz-N Pass
(150kHz~30MHz)
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EMI-Conduction(3)
230Vac/60Hz-LPass
(9kHz~150kHz)
230Vac/60Hz-L Pass
(150kHz~30MHz)
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EMI-Conduction(4)
230Vac/60Hz-NPass
(9kHz~150kHz)
230Vac/60Hz-N Pass
(150kHz~30MHz)
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EMI-Radiation(1)
110Vac/60Hz-VPass
110Vac/60Hz-H Pass
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EMI-Radiation(2)
230Vac/50Hz-VPass
230Vac/50Hz-H Pass
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