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参数资料
| 型号： | LT3473EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 1A 8DFN |
| 标准包装： | 121 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 34V |
| 输入电压： | 2.2 V ~ 16 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
LT3473/LT3473A
APPLICATIO S I FOR ATIO
Operation
The LT3473 combines a current mode, fixed frequency
PWM architecture with Burst Mode micropower operation
to maintain high efficiency at light loads. Operation can
best be understood by referring to the Block Diagram.
The reference of the part is determined by the lower of the
internal 1.25V bandgap reference and the voltage at the
CTRL pin. The error amplifier compares voltage at the FB
pin with the reference and generates an error signal V C .
When V C is below the Burst Mode threshold voltage, B TH ,
the hysteretic comparator, A1, shuts off the power section
leaving only the low power circuitry running. Total current
consumption in this state is minimized. As output loading
causes the FB voltage to decrease, V C increases causing A1
to enable the power section circuitry. The chip starts switch-
ing. If the load is light, the output voltage (and FB voltage)
will increase until A1 turns off the power section. The output
voltage starts to fall again. This cycle repeats and gener-
ates low frequency ripple at the output. This Burst Mode
operation keeps the output regulated and reduces average
current into the IC, resulting in high efficiency at light load.
If the output load increases sufficiently, A1’s output remains
high, resulting in continuous operation.
At the start of each oscillator cycle, the SR latch is set,
turning on the power switch Q1. A voltage proportional to
the switch current is added to a stabilizing ramp and the
I L
200mA/DIV
Switching Waveforms
I L
200mA/DIV
Switching Waveforms
V OUT
200mV/DIV
I L
200mA/DIV
Transient Response
V SW
10V/DIV
V SW
10V/DIV
I LOAD
11mA
1mA
V IN = 3.6V
V OUT = 20V
I LOAD = 50mA
0.5 μ s/DIV
3473 AI01
V IN = 3.6V
V OUT = 20V
I LOAD = 8mA
0.5 μ s/DIV
3473 AI02
V IN = 3.6V
V OUT = 20V
500 μ s/DIV
3473 AI03
V OUT
500mV/DIV
I L
500mA/DIV
Transient Response
V OUT
500mV/DIV
I L
500mA/DIV
Transient Response
V OUT
500mV/DIV
I L
500mA/DIV
Transient Response
I LOAD
51mA
1mA
I LOAD
55mA
5mA
I LOAD
75mA
25mA
V IN = 3.6V
V OUT = 20V
500 μ s/DIV
3473 AI04
V IN = 3.6V
V OUT = 20V
500 μ s/DIV
3473 AI05
V IN = 3.6V
V OUT = 20V
200 μ s/DIV
3473 AI06
V OUT
10V/DIV
CAP
0.5V/DIV
SHDN
5V/DIV
Shutdown Waveforms
V OUT
10V/DIV
IL
500mA/DIV
SHDN
2V/DIV
Start-Up Waveforms
V IN = 3.6V
V OUT = 20V
I LOAD = 60mA
100 μ s/DIV
3473 AI07
V IN = 3.6V
V OUT = 20V
I LOAD = 30mA
SHDN 20k, 100nF
500 μ s/DIV
3473 AI08
3473f
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3474 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Full-Featured LED Driver with 1.5A Switch Current |
| LT3474-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Step-Down 1A LED Driver |
| LT3474EFE | 制造商:Linear Technology 功能描述:LED DRVR 1Segment 5V/9V/12V/15V/18V/24V 16-Pin TSSOP EP |
| LT3474EFE#PBF | 功能描述:IC LED DRVR HP CONS CURR 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:60 系列:- 恒定电流:- 恒定电压:- 拓扑:线性（LDO），PWM，升压（升压） 输出数:8 内部驱动器:是 类型 - 主要:背光 类型 - 次要:RGB，白色 LED 频率:500kHz ~ 1.5MHz 电源电压:4.75 V ~ 26 V 输出电压:45V 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* 工作温度:-40°C ~ 85°C |
| LT3474EFE#TR | 制造商:Linear Technology 功能描述:LED DRVR 1Segment 5V/9V/12V/15V/18V/24V 16-Pin TSSOP EP T/R |
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