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RL1632R-R150-F Datenblatt(PDF) 13 Page - Allegro MicroSystems

Teilenummer RL1632R-R150-F
Bauteilbeschribung  Constant-Current 3-Ampere PWM Dimmable Buck Regulator LED Driver
PDF  17 Pages
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Hersteller  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

RL1632R-R150-F Datenblatt(HTML) 13 Page - Allegro MicroSystems

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Constant-Current 3-Ampere PWM Dimmable
Buck Regulator LED Driver
A6211
13
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Application Circuit
The application circuit in figure 14 shows a design for driving
a 15 V LED string at 1.3 A (set by RSENSE). The switching fre-
quency is 500 kHz, as set by R1. A 0.68 μF ceramic capacitor is
added across the LED string to reduce the ripple current through
the LEDs (as shown in figure 13B).
LED+
LED–
VIN
TON
EN
CS
SW
BOOT
GND
VCC
A6211
1
2
3
4
8
7
6
5
VIN = 24 to 48 V
C1
47 μF
50 V
C2
4.7uF
50V
EN
C4
0.1 μF
R1
140 kΩ
L1
10 μH / 2 A
C5
0.1 μF
RSENSE
0.15 Ω
GND
D1
60 V / 2 A
C3
0.68 μF
50 V
LED
string
(≈15 V)
Figure 14. Application circuit diagram
Suggested Components
Symbol
Part Number
Manufacturer
C1
EMZA500ADA470MF80G
United Chemi-Con
C2
UMK316BJ475KL-T
Taiyo Yuden
L1
NR8040T100M
Taiyo Yuden
D1
B250A-13-F
Diodes, Inc.
RSENSE
RL1632R-R150-F
Susumu



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