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MAX1554 Datasheet(PDF) 7 Page - Maxim Integrated Products

Part # MAX1554
Description  High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1554 Datasheet(HTML) 7 Page - Maxim Integrated Products

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High-Efficiency, 40V Step-Up
Converters for 2 to 10 White LEDs
_______________________________________________________________________________________
7
MAX1553
MAX1554
ENABLE
CONTROL
CIRCUITRY
CONTROL
LOGIC
EN
VCC
LX
DRIVER
GND
OV
COMPARATOR
REF
OV
UVLO
1.25V
BANDGAP
REFERENCE
BIAS
GENERATOR
CURRENT
LIMIT
VLIM
REF
67k
BRT
FB
SS
1.72V
128k
206k
MINIMUM
tOFF ONE-SHOT
MINIMUM
tON ONE-SHOT
ERROR
COMPARATOR
LX
SS
R1
10
R3
10k
R2
200k
VCC
FB
ON
OFF
BRT
GND
2.7V TO 5.5V
INPUT
C1
4.7
µF
C3
0.1
µF
C2
0.47
µF
25V
L1
47
µH
TOKO A920CY-470M
D1
CMDSH2-3
OV
EN
D2–D7
WHITE
LEDs
PWM
OR
DC CONTROL
MAX1553
C4
4700pF
Figure 1. Circuit with the MAX1553 Driving Six White LEDs
LX
SS
R1
10
R3
10k
R2
330k
VCC
FB
ON
OFF
BRT
GND
2.7V TO 5.5V
INPUT
C1
10
µF
C3
0.1
µF
C2
0.47
µF
50V
L1
4.7
µH
MURATA LQH32C
D1
CMDSH1-60M
OV
EN
D2–D10
WHITE
LEDs
PWM
OR
DC CONTROL
MAX1553
C4
3300pF
Figure 2. Circuit with the MAX1553 Driving Nine White LEDs at
Up to 15mA
Functional Diagram


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