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R2A20134ASP Datasheet(PDF) 11 Page - Renesas Technology Corp

Part # R2A20134ASP
Description  LED Lighting Power Controller
PDF  14 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

R2A20134ASP Datasheet(HTML) 11 Page - Renesas Technology Corp

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R2A20134ASP
R03DS0067EJ0301 Rev.3.01
Page 11 of 13
Jan 08, 2016
2. Peak Current and Zero Current Detection Mode Buck-Converter
2.1 System Diagram
From OUT
C1
L1
D1
Q1
To
CS
filter
Rcs
Ri1
D2
From D
Q
D
D3
R2
R1
Rsub
D4
(*1)
(*2)
(*1)
This parts are necessary for
LED open protection(OVP).
(*2)
When you use only inductor short
protection, Please set R2 to 0
Ω.
To Q
0.1
μ
Rec+
Rec–
Iin
Iout
Iled
Vout
10
μ
+
Z1
Vin
Logic Block
RAMP Control
1st OCP
4
VREF
5
CS
8
VCC
6
GND
OUT
0.6V
+
–
2.5V
+
–
2V
1V
Max Duty Detect
+
–
+
–
1V
0.605V
Error
Amp
VREF
250n
1
FB
–
+
10p
VREF
OFF: 9.2V/ON: 12V
VREF: 5.02V
UVLO
COMP
4.1V
TSD ON: 155°C
OFF: 110°C
2
S
R
Q
7
–
+
VREF
Rrt
RT
3
VCC
VREF
15
μ
2nd OCP&OVP



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