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参数资料
| 型号： | LT3475EFE-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR HP CONS CURR 20TSSOP |
| 标准包装： | 74 |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压） |
| 输出数： | 2 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 颜色，白色 LED |
| 频率： | 200kHz ~ 2MHz |
| 电源电压： | 3.7 V ~ 36 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 20-TSSOP-EP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
LT3475/LT3475-1
PI FU CTIO S
R T (Pin 14): The R T pin is used to set the internal
oscillator frequency. Tie a 24.3k resistor from R T to GND
for a 600kHz switching frequency.
SHDN (Pin 16): The SHDN pin is used to shut down the
switching regulator and the internal bias circuits. The
2.6V switching threshold can function as an accurate
undervoltage lockout. Pull below 0.3V to shut down the
LT3475/LT3475-1. Pull above 2.6V to enable the LT3475/
LT3475-1. Tie to V IN if the SHDN function is unused.
REF (Pin 17): The REF pin is the buffered output of the
internal reference. Either tie the REF pin to the V ADJ pin
for a 1.5A output current, or use a resistor divider to
generate a lower voltage at the V ADJ pin. Leave this pin
unconnected if unused.
BLOCK DIAGRAM
V IN
C IN
V C1 , V C2 (Pins 18, 13): The V C pin is the output of the
internal error amp. The voltage on this pin controls the
peak switch current. Use this pin to compensate the
control loop.
V ADJ1 , V ADJ2 (Pins 19, 12): The V ADJ pin is the input to
the internal voltage-to-current ampli?er. Connect the V ADJ
pin to the REF pin for a 1.5A output current. For lower
output currents, program the V ADJ pin using the following
formula: I LED = 1.5A ? V ADJ /1.25V.
PWM1, PWM2 (Pins 20, 11): The PWM pin controls the
connection of the V C pin to the internal circuitry. When
the PWM pin is low, the V C pin is disconnected from the
internal circuitry and draws minimal current. If the PWM
feature is unused, leave this pin unconnected.
R T
V IN
SHDN
R T
V IN
D1
BOOST1
INT REG
AND
UVLO
MASTER
OSC
BOOST2
D2
C1
Q
R
C1
∑
SLOPE COMP
SLOPE COMP
∑
C2
R
Q
C2
MOSC 1
MOSC 2
L1
SW1
Q1
DRIVER
Q
S
SLAVE
OSC
SLAVE
OSC
S
Q
DRIVER
Q2
SW2
L2
D3
OUT1
FREQUENCY
FOLDBACK
FREQUENCY
FOLDBACK
OUT2
D4
C OUT1
0.067Ω
100Ω
100Ω
0.067Ω
C OUT2
LED1
2V
2V
LED2
D LED1
gm1
1.25V
gm2
D LED 2
C C1
PWM 1
V C1
Q3
1.25k
Q4
1.25k
PWM2
V C2
C C2
V ADJ1
REF
V ADJ2 EXPOSED
PAD
GND
3475 BD
3475fb
6
相关PDF资料 |
PDF描述 |
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| LT3476EUHF#PBF | IC LED DRVR HP CONST CURR 38-QFN |
| LT3477EFE#PBF | IC LED DRVR HP CONS CURR 20TSSOP |
| LT3478IFE#PBF | IC LED DRVR HP CONS CURR 16TSSOP |
| LT3486EFE#PBF | IC LED DRVR WHITE BCKLGT 16TSSOP |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3475EFE-1-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Step-Down l 1.5A LED Driver |
| LT3475EFEPBF | 制造商:Linear Technology 功能描述:Dual Step-Down 1.5A LED Driver,LT3475 |
| LT3475EFE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Step-Down l 1.5A LED Driver |
| LT3475EFE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Step-Down l 1.5A LED Driver |
| LT3475FE-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Step-Down l 1.5A LED Driver |
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