EVB RT8497GS-00 EN

RT8497 Evaluate Report
for non-isolation floating
buck LED driver (bulb
application)
February 2016
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RT8497 Brief Introduction
RT8497 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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RT8497 Features
High Efficiency BCM LED Driver Controller for
High Power Factor Offline Applications
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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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RT8497 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
60Hz
60Hz
60Hz
60Hz
60Hz
50Hz
50Hz
50Hz
50Hz
50Hz
current regulation =
△ Effiency =
Maximum PFC =
Minimum PFC =
Line filter on
Vac [V]
Pin [watt]
Vout[V]
Iout[mA]
Pout [watt]
Total Eff. [%]
PF Value
THD [%]
90
100
110
120
132
195
220
230
240
264
2.85%
3.14%
0.966
0.912
10.630
10.510
10.460
10.430
10.410
10.530
10.600
10.620
10.660
10.740
61.40
61.39
61.39
61.37
61.37
61.37
61.35
61.34
61.33
61.32
149.8
150.5
151.1
151.7
152.1
153.6
154
154
154.1
154.2
9.198
9.239
9.276
9.310
9.334
9.426
9.448
9.446
9.451
9.456
86.53%
87.91%
88.68%
89.26%
89.67%
89.52%
89.13%
88.95%
88.66%
88.04%
0.912
0.935
0.950
0.959
0.966
0.963
0.949
0.942
0.935
0.913
43.71
36.37
30.97
26.78
22.93
13.83
13.13
13.19
13.36
14.16
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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
10 ohm, 1/4W
LX1
3.6mH, DR0608
BD1
LBS10-H
U1
RT8497, SOP8
D2
ES2J (RC=22R,150pF)
L1 (wire)
EE-13, 1.2mH
L1 (core)
R5, R6
3.0//3.3 ohm, 1206
C3
4.7uF/50V, 1206
D6
FR107
ZD1
36V , SOD123
EC1
E-cap, 150uF/80V
60.1
67.8
52.9
74.3
49.4
50.7
50.8
55.8
58.1
51.9
57.4
41.5
264Vac/50Hz input
F1
10 ohm, 1/4W
LX1
3.6mH, DR0608
BD1
LBS10-H
U1
RT8497, SOP8
D2
ES2J (RC=22R,150pF)
L1 (wire)
EE-13, 1.2mH
L1 (core)
R5, R6
3.0//3.3 ohm, 1206
C3
4.7uF/50V, 1206
D6
FR107
ZD1
36V , SOD123
EC1
E-cap, 150uF/80V
36.9
49.3
41.8
72.7
54.1
56.4
53.3
57.8
55.3
51.6
57
44.8
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PCB Layout
TOP Layer
BOTTOM Layer
PCB No : PCB019_V1
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Demo Board Photo
L
LED +
N
LED Length
Width
Height
40mm
60mm
20mm
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BOM
Item
Location
Value
Type
1
BD1
LBS10-H
TDI (Macro DIP)
2
C2
0.1uF/50V, X7R
C0603
3
C3
4.7uF/50V
C1206
4
C4
150pF/1kV
C1206
5
C7
1nF/50V, X7R
C0603
6
CF2
Film cap, 0.1uF/450V
CF-P10
7
D2
ES2J (600V, 2A)
SMB
8
D6
FFM107-M
SOD-123
9
EC1
E-cap, ZLH, 150uF/80V
10*20mm
10
F1
10 ohm, 1/4W
DIP, 1/4W
11
L1
EE-13, 1.2mH
EE-13
12
LX1
Drum core, 3.6mH
DR0608
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BOM
Item
Location
Value
Type
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R1,R2
510k ohm
R1206
14
R3
560k ohm
R0603
15
R5
3.3 ohm
R1206
16
R6
3.0 ohm
R1206
17
R7
100k ohm
R1206
18
R8
10 ohm
R0805
19
R9
22 ohm
R1206
20
RX1
5.6k ohm
1206
21
RX2
0 ohm (Jumper)
1206
22
U1
RT8497
SOP-8
23
VR1 (CF1)
Film cap, 0.1uF/450V
CF-P10
24
ZD1
Zener, BZT55C36
SOD-123F
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Transformer
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Power Component Voltage Stress
Test condition: 264Vac/50Hz input , 60V/150mA output
Stead state
Location
Max rating (V)
Measure
De-rating
U1 (Vds)
500
404
80.8%
D7
600
400
66.7%
Transient State
Location
Max rating (V)
Measure
De-rating
U1 (Vds)
500
397
79.4%
D7
600
404
67.3%
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Start up waveform
Vac_in = 90V
T_start up =1380ms
Vac_in = 264V
T_start up =288ms
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Harmonic(IEC61000-3-2)
110Vac input
Class C : TBD
Class D : Pass
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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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