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LT3795IFEPBF 参数 Datasheet PDF下载

LT3795IFEPBF图片预览
型号: LT3795IFEPBF
PDF下载: 下载PDF文件 查看货源
内容描述: 110V LED控制器与扩展频谱频率调制 [110V LED Controller with Spread Spectrum Frequency Modulation]
分类和应用: 控制器
文件页数/大小: 28 页 / 438 K
品牌: LINEAR_DIMENSIONS [ LINEAR DIMENSIONS SEMICONDUCTOR ]
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LT3795
110V LED Controller with
Spread Spectrum Frequency Modulation
FeaTures
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DescripTion
The
is a DC/DC controller designed to regulate a
constant-current or constant-voltage and is ideal for driv-
ing LEDs. It drives a low side external N-channel power
MOSFET from an internal regulated 7.7V supply. The fixed
frequency and current mode architecture result in stable
operation over a wide range of supply and output volt-
ages. Spread spectrum frequency modulation (SSFM) can
be activated for improved electromagnetic compatibility
(EMC) performance. The ground referred voltage FB pin
serves as the input for several LED protection features,
and also allows the converter to operate as a constant-
voltage source. The maximum output current is set by an
external resistor, and the output current amplifier has a rail-
to-rail common mode range. The LT3795 also includes a
separate input current sensing amplifier that is used to limit
input current. The TG pin inverts and level shifts the PWM
signal to drive the gate of the external PMOS. The PWM
input provides LED dimming ratios of up to 3000:1, and the
CTRL inputs provide additional analog dimming capability.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and True
Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 7199560, 7321203,
7746300.
3000:1 True Color PWM™ Dimming
Wide Input Voltage Range: 4.5V to 110V
Input and Output Current Reporting
PMOS Switch Driver for PWM and Output Disconnect
Internal Spread Spectrum Frequency Modulation
±2% Constant Voltage Regulation
±3% Constant Current Regulation: 0V ≤ V
OUT
≤ 110V
Programmable Input Current limit
CTRL Inputs Linearly Adjust LED Current
Adjustable Frequency: 100kHz to 1MHz
Programmable Open LED Protection with
OPENLED
Flag
Short-Circuit Protection and
SHORTLED
Flag
Programmable Undervoltage Lockout with Hysteresis
Soft-Start with Programmable Fault Restart Timer
C/10 Detection for Battery Charging
Available in 28-Lead TSSOP Package
applicaTions
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High Power LED, High Voltage LED
Battery Chargers
Accurate Current Limited Voltage Regulators
Typical applicaTion
Short-Circuit Robust Boost LED Driver with Spread Spectrum Frequency Modulation
V
IN
8V TO 60V
110V (TRANSIENT)
63V OVLO
15m
2.2µF
×3
499k
115k
12.4k
CTRL1
CTRL2
V
REF
PWM
10nF
INTV
CC
100k
OPENLED
SHORTLED
100k
OPENLED
SHORTLED
V
C
RT
10k
6.8nF
47nF
PWM
IVINCOMP
RAMP
EN/UVLO V
IN
OVLO
IVINP
IVINN
GATE
SENSE
15m
LT3795
GND
FB
ISP
620m
ISN
TG
INTV
CC
ISMON
SS
INTV
CC
4.7µF
87V LED
400mA
22µH
1M
2.2µF
×4
100
95
EFFICIENCY (%)
90
85
80
75
70
Efficiency vs V
IN
13.3k
0
10
20
30
V
IN
(V)
40
50
60
3795 TA01b
31.6k
250kHz
0.1µF
0.1µF
3795 TA01a
For more information
1
3795f