RT7304 Buck-boost Bulb 8W

RT7304 Evaluate Report
for Bulb Internal Power
(Buck-Boost)
ACDC BU / SLM Division
Aug. 2015
http://www.richtek.com/LED
CONFIDENTIAL
RT7304 Brief introduction
RT7304 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
………
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Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
CONFIDENTIAL
RT7304 Features
Primary-Side Regulation LED Driver Controller
with Active PFC
• Primary Side Regulation(PSR)
• Power Factor Correction(PFC)
• Critical conduction mode(CRM)
• Max/Min switch frequency clamping
• Max/Min on time limitation
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Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
CONFIDENTIAL
RT7304 Advantage
• Universal input voltage. (90Vac~264Vac)
• Good LED current regulation.
• No shunt regulator and photo to achieve the 2 nd regulation.
• Protection:
a. Open-circuit protection
b. 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.
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
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Circuit
5
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is a registered trademark of Richtek Technology Corporation.
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Electrical Performance
6
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is a registered trademark of Richtek Technology Corporation.
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Efficiency
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Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
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Power Factor
8
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
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Current regulation
Limit in 0.76%
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
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CONFIDENTIAL
Load regulation
Frequency
60Hz
Vac [V]
110
Vout [V]
Iout [mA]
57.06
133
60Hz
110
60.04
132
60Hz
110
63.08
132
50Hz
230
57.04
133
50Hz
230
60.20
131
50Hz
230
63.11
131
Load regulation
0.75%
1.50%
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Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
CONFIDENTIAL
PCB layout
Top silk
Bottom Silk
Bottom Trace
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Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
CONFIDENTIAL
Demo board photo
LED+
N
N
L
L
LED-
LED-
LED+
PCB No : RT7304_BB_Bulb_V2
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
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CONFIDENTIAL
BOM
Item
Location
Value
Type
1
F1
T1A/300V
SS-5F-2P
2
CX1
0.047uF
12.5X6-10MM
3
L1
6.5mH
LD-D8
4
U1
TB8S
DB-TB6S
5
C1
0.1uF/450V
CF-P10
6
R1
390kohm
1206
7
R2
390kohm
1206
8
EC1
10uF/50V
CE-D6.3
9
R15
10ohm
0805
10
D2
FR107
SOD-123
11
C5
2.2uF/25V
0805
12
U3
RT7304
SOT23-6
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
13
CONFIDENTIAL
BOM
Item
Location
Value
Type
13
R14
120kohm
0805
14
R16
16.9kohm
0805
15
C3
22pF/50V
0805
16
Q1
4A/600V
TO-251
17
D5
1N4148
SOD323
18
R8
150ohm
0603
19
R10
1.43ohm
1206
20
R11
3kohm
R1WR_P5
21
T1
EE-13
EE-13
22
D3
ES-1J
D-SMA
23
R7
33.2ohm
1206
24
C7
220pF/1kV
1206
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
14
CONFIDENTIAL
BOM
Item
Location
Value
Type
25
EC2
82uF/100V
8X18-H1
26
C4
4.7n/1kV
1206
Total: 26pcs
15
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
CONFIDENTIAL
Optional component
Item
Location
Value
Type
1
RV1
7N471K
VR-7-5MM
2
R9
0ohm
1206
3
D4
0ohm
0805
4
JP1
7.5mm
W7-5
5
C6
2.2nF/1kV
1206
6
R6
150kohm
1206
7
D6
FM4007
SOD-123
Total: 7pcs
16
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
CONFIDENTIAL
Transformer
17
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is a registered trademark of Richtek Technology Corporation.
CONFIDENTIAL
Power Component Stress Voltage
Test condition: 90Vac input / 60V, 130mA output
Stead state
Location
Max rating (V)
Measure
De-rating
Q1
600
253
42.2%
D1
600
157
26.2%
Transient State
Location
Max rating (V)
Measure
De-rating
Q1
600
256
42.7%
D1
600
162
27.0%
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Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
CONFIDENTIAL
Power Component Stress Voltage
Test condition: 264Vac input / 60V, 130mA output
Stead state
Location
Max rating (V)
Measure
De-rating
Q1
600
508
84.7%
D1
600
364
60.7%
Transient State
Location
Max rating (V)
Measure
De-rating
Q1
600
512
85.3%
D1
600
370
61.7%
19
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
CONFIDENTIAL
LED open protection
Vac_in = 90V
Ch2:Vout ; Ch3:Vzcd ; Ch4:Vdd
Vac_in = 264V
Ch2:Vout ; Ch3:Vzcd ; Ch4:Vdd
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.
20
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
CONFIDENTIAL
LED Short protection
Vac_in = 90V
Ch2:Vout ; Ch3:Vgate ; Ch4:Vcs
Vac_in = 264V
Ch2:Vout ; Ch3:Vgate ; Ch4:Vcs
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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Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
CONFIDENTIAL
Harmonic(IEC61000-3-2)
110V input
Class C : Pass
Class D : Pass
22
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is a registered trademark of Richtek Technology Corporation.
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Harmonic(IEC61000-3-2)
230V input
Class C : Pass
Class D : Pass
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is a registered trademark of Richtek Technology Corporation.
CONFIDENTIAL
Conduction-EMI
230V-LPass
230V-N Pass
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is a registered trademark of Richtek Technology Corporation.
CONFIDENTIAL
Conduction-EMI
110V-LPass
110V-N Pass
25
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
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Radiation-EMI
230V-V Pass
230V-H Pass
26
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
CONFIDENTIAL
Radiation-EMI
110V-V Pass
110V-H Pass
27
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.