Linear Technology DC1205A - LT3592EDDB Demoboard | 500mA Wide Input Voltage Range Step-Down LED Driver DC1205A DC1205A Ficha De Dados
Códigos do produto
DC1205A
LT3592
1
3592fc
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
500mA Wide Input Voltage
Range Step-Down LED Driver
with 10:1 Dimming
The LT
®
3592 is a fi xed frequency step-down DC/DC con-
verter designed to operate as a constant-current source.
An external sense resistor monitors the output current
allowing accurate current regulation, ideal for driving
high current LEDs. The output current can be dimmed
by a factor of 10 using an external signal for nighttime
brake lights.
An external sense resistor monitors the output current
allowing accurate current regulation, ideal for driving
high current LEDs. The output current can be dimmed
by a factor of 10 using an external signal for nighttime
brake lights.
The high switching frequency offers several advantages by
permitting the use of a small inductor and small ceramic
capacitors. Small components combined with the LT3592’s
10-pin DFN leadless surface mount package save space and
cost versus alternative solutions. The constant switching
frequency combined with low-impedance ceramic capaci-
tors result in low, predictable output ripple.
permitting the use of a small inductor and small ceramic
capacitors. Small components combined with the LT3592’s
10-pin DFN leadless surface mount package save space and
cost versus alternative solutions. The constant switching
frequency combined with low-impedance ceramic capaci-
tors result in low, predictable output ripple.
A wide input voltage range of 3.6V to 36V makes the
LT3592 useful in a variety of applications. Current mode
PWM architecture provides fast transient response and
cycle-by-cycle current limiting. Thermal shutdown provides
additional protection.
LT3592 useful in a variety of applications. Current mode
PWM architecture provides fast transient response and
cycle-by-cycle current limiting. Thermal shutdown provides
additional protection.
50/500mA Two Series Red LED Driver
n
Wide Input Voltage Range
Operation from 3.6V to 36V
n
Resistor Adjustable 400kHz–2.2MHz Switching
Frequency
n
Shorted and Open LED Protected
n
Internal Switch Current Sense Resistor
n
External Resistor Programs LED Current, Pin
Selects 10:1 Ratio
n
50mA/500mA LED Current Settings
n
Catch Diode Current Sense to Prevent Runaway at
High V
IN
n
Small Thermally Enhanced 10-Lead DFN
(2mm × 3mm) and MSOP-10 Packages
n
Automotive Signal Lighting
n
Industrial Lighting
n
Constant-Current, Constant Voltage Supplies
Effi ciency for 2 Red LEDs, L = 10μH, 900kHz
10μH
51k
3592 TA01a
4.7μF
1μF
0.4Ω
10k
0.1μF
V
IN
SHDN
BRIGHT
R
T
BOOST
SW
DA
CAP
OUT
V
FB
LT3592
GND
ON
BRAKE
140k
900kHz
+
200/20mV
–
V
IN
7V TO 32V
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
All other trademarks are the property of their respective owners.
INPUT VOLTAGE (V)
4
EFFICIENCY (%)
100
95
90
60
75
70
65
80
85
55
50
20
12
24
3592 TA01b
28
16
8
BRIGHT 500mA