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MAX16821 Datasheet(PDF) 13 Page - Maxim Integrated Products

Part # MAX16821
Description  High-Power Synchronous HBLED Drivers with Rapid Current Pulsing
PDF  24 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX16821 Datasheet(HTML) 13 Page - Maxim Integrated Products

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Applications Information
Boost LED Driver
Figure 5 shows the MAX16821A–MAX16821C configured
as a synchronous boost converter with MODE connected
to VCC. During the on-time, the input voltage charges
the inductor. During the off-time, the inductor discharges
to the output. The output voltage cannot go below the
input voltage in this configuration. Resistor R1 senses
the inductor current and resistor R2 senses the LED
current. The outer LED current regulation loop programs
the average current in the inductor, thus achieving tight
LED current regulation.
Figure 5. Synchronous Boost LED Driver (Output Voltage Not to Exceed 28V)
1
2
3
4
5
6
8
7
21
20
19
18
17
16
15
9
10
11
12
13
14
22
23
24
25
26
27
28
Q1
VLED
C1
C4
LED
STRING
VIN
C2
D1
VIN
7V TO 28V
C11
C10
C9
C8
R8
R5
R10
R3
R4
VCC
ON/OFF
R7
R5
PGND
N.C.
N.C.
DL
BST
LX
DH
I.C.
OUTV RT/SYNC
EN
MODE CLKOUT SGND
SGND SENSE- SENSE+ SGND
IN
VCC
VDD
OVI
CLP
EAOUT
EAN
DIFF
CSN
CSP
MAX16821A
MAX16821B
MAX16821C
VLED
C3
C7
C6
C5
R1
R2
R9
Q2
L1
MAX16821A/MAX16821B/
MAX16821C
High-Power Synchronous HBLED
Drivers with Rapid Current Pulsing
www.maximintegrated.com
Maxim Integrated │ 13



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