RT7304 EVB Document
for 30W Power Board(中山市場)
(Flyback)
深圳永恒伟业电子有限公司
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2RT7304 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
Power Board
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 2nd 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~41Vout / 900mA
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Electrical Performance~37Vout / 900mA
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Electrical Performance~34Vout / 900mA
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Efficiency
Vac [Vrms]
9
Power Factor
Vac [Vrms]
10
Current regulation
Vac [Vrms]
11
Load regulation
Iout [mA]
Vout [V]
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Temperature
Test Condition: Burn-in 30min. @ Ta=25
℃
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Transformer
PCB layout
Top Trace
Bottom Trace
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16Demo board photo
Length Width Height 70mm 26mm 25mm
PCB No :RT7304_Flyback_30W Non-EMC_V4
LED+
LED-L
N
LED+LED-
L
N
BOM
17
BOM
18
BOM
Total : 32pcs
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Heat Sink physical dimension for Q1
unit:[mm]
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