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ZLED7015 데이터시트(PDF) 13 Page - Integrated Device Technology

부품명 ZLED7015
상세설명  1.0MHz Boost Converter
PDF  22 Pages
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제조업체  IDT [Integrated Device Technology]
홈페이지  http://www.idt.com
Logo IDT - Integrated Device Technology

ZLED7015 데이터시트(HTML) 13 Page - Integrated Device Technology

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ZLED7015 Datasheet
© 2016 Integrated Device Technology, Inc.
13
April 20, 2016
EN
LX
ZLED7015
LED
String
VIN = 6 to 30 VDC
COUT
R1
L1
CIN
D1
FB
PGND
AGND
OVP
R2
RS
VP
VDD
C1
CVDD
CVP
C2
RVDD
REN
COVP
R4
R3
DC Control Signal VDC = 0 to 5V
VOUT
EN
LX
ZLED7015
LED
String
VIN = 6 to 30 VDC
COUT
R1
L1
CIN
D1
FB
PGND
AGND
OVP
R2
RS
VP
VDD
C1
CVDD
CVP
C2
RVDD
REN
COVP
VOUT
Figure 2.1
Typical Application Circuit
2.2.2
Dimming via External DC Voltage Control
The LED output current can be set below the nominal average value defined on section 2.2.1 by using an external
DC voltage control signal superimposed on the FB pin as shown in the example circuit in Figure 2.2. As the DC
control signal, VDC, increases, the current through R3 increases with a subsequent increase in the voltage at the
FB pin. This causes the ZLED7015 to compensate by reducing the output current through the LED string.
Consequently, the output current is inversely proportional to the DC control voltage.
Note: It is important to ensure that the LED output voltage VOUT remains higher than the input voltage VIN in
dimming applications.
Figure 2.2
Example Circuit for Controlling Output Current via an External DC Control Voltage



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