EVB RT7306GS RFID

RT7306 Evaluate Report
for RFID Dim Bulb EVB
(Buck-Boost)
ACDC BU / SLM Division
Apr . 2015
http://www.richtek.com/LED
CONFIDENTIAL
RT7306 Brief introduction
RT7306 is an active power factor correction controller specifically
designed for using as a constant current LED driver.
Supporting:
Isolation: PSR mode
Non-isolation: Buck-Boost mode
Applications
AC/DC LED lighting driver
for Smart dimming function
………
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CONFIDENTIAL
RT7306 Features
Primary-Side Regulation PWM Controller and
High PF LED Driver
• Primary Side Regulation(PSR)
• Power Factor Correction(PFC)
• Compatible with Analog Dimming
• Built-in HV start-up Device
• Critical conduction mode(CRM)
• Max/Min switch frequency clamping
• Max/Min on time limitation
• THD Optimization
• Input Voltage Feed-Forward Compensation
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CONFIDENTIAL
RT7306 Advantage
• Universal input voltage. (90Vac~264Vac)
• Tight LED current regulation.
• No shunt regulator and photo to achieve the 2 nd regulation.
• Protection:
a. LED Open-circuit protection
b. LED Short-circuit protection
c. Output diode short-circuit protection
d. Vdd under/over voltage protection
e. Over temperature protection
f . Cycle-by-cycle current limitation
g. Excellent PF and THD.
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CONFIDENTIAL
Circuit
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CONFIDENTIAL
Electrical Performance
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CONFIDENTIAL
Efficiency
Efficiency
90%
85%
80%
75%
70%
65%
60%
90
110
132
180
200
220
240
264
Vin_ac(V)
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CONFIDENTIAL
Power Factor
PF
1.00
0.95
0.90
0.85
0.80
0.75
0.70
90
110
132
180
200
220
240
264
Vin_ac(V)
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CONFIDENTIAL
Current regulation
I_out(mA)
300
290
280
270
260
250
240
230
220
210
200
90
110
132
180
200
220
240
264
Vin_ac(V)
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CONFIDENTIAL
Load regulation
I_out(mA)
300
280
260
240
110V
220
220V
200
30
32
34
36
V_out(V)
38
40
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CONFIDENTIAL
RFID Dimming Performance
300.0
DIM VS RF dim range
250.0
100.0
0.00
90Vac
220Vac
264Vac
50.0
0.50
110Vac
V_Dim [V]
150.0
I-LED [mA]
200.0
RF Dim range [%]
100 90 80 70 60 50 40 30 20 10 0
1.00
1.50
DIM VS RF dim
range
2.00
2.50
0.0
0
10 20 30 40 50 60 70 80 90 100
RF Dim [%]
3.00
3.50
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CONFIDENTIAL
PCB layout
Top Trace
Bottom Trace
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CONFIDENTIAL
Demo board photo
LED-
L
LED+
N
Aerial
N
LED+
L
LED-
PCB No : PCB018_V1
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CONFIDENTIAL
BOM
Item
Location
Value
Type
1
F1
7R5 / 1W
(DIP)
2
VR1
TVR07471
D=7mm (DIP)
3
L1, L2
1.5mH
DR0608
4
T1
Lp=1950uH
EE1310
5
BD1
ABS10
Mini-Dip
6
D1
RS1M
D-SMA
7
D2, D5
TBAV21W
SOD-123
8
D3
CDBB3200
D-SMB
9
D4
T1N4148W-H
SOD-123
10
Q1
ISU04N65A
TO-251
11
U1
RT7306
SOP-8
12
U2
RT9058-50GV
SOT-23
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CONFIDENTIAL
BOM
Item
Location
Value
Type
13
U3
FI-MM6600
---
14
RL1, RL2
4.32K
0805
15
R3
10K
1206
16
R5
150K
1206
17
R6
47R
0805
18
R7
909R
0805
19
R8
3R
1206
20
R9
3R
1206
21
R10
80.6K
0603
22
R11
9.1K
0603
23
R12, R17
10R
0603
24
R13
300K
0603
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CONFIDENTIAL
BOM
Item
Location
Value
Type
25
R14
453K
0603
26
R15
47R
1206
27
R16
56K
0805
28
CX1, C1
0.1uF/450V
(DIP)
29
C3
22nF/10V
0603
30
C4
1uF/10V
0603
31
C5
2.2nF/1KV
1206
32
C7
2.2uF/25V
0805
33
C8
100pF/1KV
1206
34
C19
4.7nF/1KV
1206
35
EC1
10uF/50V
D=5mm (DIP)
36
EC2
220uF/50V
D=10mm (DIP)
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CONFIDENTIAL
BOM
Item
Location
Value
Type
37
EC3
100uF/35V
D=6.3mm (DIP)
Total :42pcs
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CONFIDENTIAL
Transformer
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CONFIDENTIAL
Power Component Stress Voltage
Test condition: 264Vac input / 36V,260mA output
Stead state
Location
Max rating (V)
Measure
De-rating
Q1
650
564
86.7%
D1
200
174
87%
Transient State
Location
Max rating (V)
Measure
De-rating
Q1
650
548
84.3%
D1
200
166
83%
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CONFIDENTIAL
Start up waveform
Vac_in = 90V
T_start up =196ms
Vac_in = 264V
T_start up =132ms
CH1: I-LED , CH2: VCC , CH3: V-LED , CH4: V-AC LINE
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CONFIDENTIAL
LED open protection
Vac_in = 90V
CH1: VCC , CH2: V-ZCD , CH3: V-OUT
Vac_in = 264V
CH1: VCC , CH2: V-ZCD , CH3: V-OUT
When LED open , the output keeps rising and causing the VZCD rising
accordingly. If Vzcd trigger the protected level(2.9V~3.3V), the IC latch down.
IC will be auto-restarted when the output is recovered.
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CONFIDENTIAL
LED Short protection
Vac_in = 90V
CH1: VCC , CH2: V-CS , CH3: V-OUT
Vac_in = 264V
CH1: VCC , CH2: V-CS , CH3: V-OUT
When LED short , the output level is 0V and the Vcs will rise to trigger the
protected function. IC will be auto-restarted when the output is recovered.
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CONFIDENTIAL
Harmonic(IEC61000-3-2)
110V input
Class C : Pass
Class D : Pass
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CONFIDENTIAL
Harmonic(IEC61000-3-2)
230V input
Class C : Pass
Class D : Pass
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CONFIDENTIAL
Conduction-EMI
110V-LPass
110V-N Pass
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CONFIDENTIAL
Conduction-EMI
230V-LPass
230V-N Pass
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CONFIDENTIAL
Radiation-EMI
110V-V Pass
110V-H Pass
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CONFIDENTIAL
Radiation-EMI
230V-V Pass
230V-H Pass
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