RT7304 Flyback Bulb 45Vout 178mA

RT7304 Evaluate Report
for Bulb Internal Power
(Flyback)
ACDC BU / SLM Division
Feb . 2016
http://www.richtek.com/LED
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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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RT7304 Features
Primary-Side Regulation PWM Controller and
High PF LED Driver
• 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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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.
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Circuit
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Electrical Performance
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Efficiency
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Power Factor
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Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
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Current regulation
Limit in 2.82%
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Load regulation
Frequency
Vac [V]
Vout [V]
Iout [mA]
60Hz
110
41.49
178
60Hz
110
44.53
177
60Hz
110
47.70
177
50Hz
230
41.62
181
50Hz
230
44.75
180
50Hz
230
47.69
179
Load regulation
0.56%
1.10%
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PCB layout
Top Trace
Bottom Trace
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Demo board photo
Length
Width
Height
47mm
25mm
18mm
PCB No : PCB024_V1
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BOM
Item
Location
Value
Type
1
F1
1A/250V
SS-5F-2P
2
LX1
5.5mH
DR0612
3
LX2
5.5mH
DR0612
4
T1
Lm=1950uH
EE-16
5
BD1
TB6S
DB-TB6S
6
D1
1N4148
SOD-323
7
D2
FFM-107-M
SOD-123
8
D3
GS1M
SMA
9
D4
ES2G
SMB
10
IC1
RT7304
SOT-23-6
11
Q1
04N65
TO-251
12
R1
300KΩ
1206
13
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BOM
Item
Location
Value
Type
13
R2
300KΩ
1206
14
R3
150Ω
0805
15
R4
3Ω
1206
16
R4A
3.3Ω
1206
17
R5
3KΩ
DIP
18
R6
43KΩ
0805
19
R7
8.2KΩ
0805
20
R8
10Ω
0805
21
R9
150KΩ
1206
22
R11
47Ω
1206
23
R12
200KΩ
1206
24
RX1
20KΩ
1206
14
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BOM
Item
Location
Value
Type
25
RX2
20KΩ
1206
26
R10
100Ω
1206
27
CX1
0.047uF/275V
12.5X6-10MM
28
C1
0.1uF/275V
CAP-3X10MM
29
C3
2.2uF/10V
0805
30
C5
2.2nF/1KV
1206
31
C6
100pF/1KV
1206
32
C7
1nF/250Vac
DIP
33
EC1
10uF/50V
EC-5X11
34
EC2
100uF/63V
EC-8X20
Total : 34 pcs
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Optional component
Item
Location
Value
Type
1
VR1
7N471K
DIP
Total : 1 pcs
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Transformer
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Power Component Stress Voltage
Test condition: 90Vac input / 45V,178mA output
Stead state
Location
Max rating (V)
Measure
De-rating
Q1
650
300
46.15%
D1
400
139
34.75%
Transient State
Location
Max rating (V)
Measure
De-rating
Q1
650
300
46.15%
D1
400
139
34.75%
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Power Component Stress Voltage
Test condition: 264Vac input / 45V,178mA output
Stead state
Location
Max rating (V)
Measure
De-rating
Q1
650
560
86.15%
D1
400
320
80.00%
Transient State
Location
Max rating (V)
Measure
De-rating
Q1
650
564
86.77%
D1
400
324
81.00%
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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.
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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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Harmonic(IEC61000-3-2)
110V input
Class C : Pass
Class D : Pass
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Harmonic(IEC61000-3-2)
230V input
Class C : Pass
Class D : Pass
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Conduction-EMI
(230V-LPass)
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Conduction-EMI
(230V-NPass)
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Conduction-EMI
(110V-LPass)
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Conduction-EMI
(110V-NPass)
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Radiation-EMI
230V-V Pass
230V-H Pass
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Radiation-EMI
110V-V Pass
110V-H Pass
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