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参数资料
| 型号： | LT3466EFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 16TSSOP |
| 标准包装： | 95 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 2 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 800kHz ~ 1.3MHz |
| 电源电压： | 2.7 V ~ 24 V |
| 输出电压： | 39.5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
LT3466
APPLICATIO S I FOR ATIO
D =
DUTY CYCLE
The duty cycle for a step-up converter is given by:
V OUT + V D – V IN
V OUT + V D – V CESAT
where:
V OUT = Output voltage
V D = Schottky forward voltage drop
V CESAT = Saturation voltage of the switch
V IN = Input battery voltage
The maximum duty cycle achievable for LT3466 is 96%
(typ) when running at 1MHz switching frequency. It in-
creases to 99% (typ) when run at 200kHz and drops to
92% (typ) at 2MHz. Always ensure that the converter is not
duty-cycle limited when powering the LEDs at a given
switching frequency.
SETTING THE SWITCHING FREQUENCY
The LT3466 uses a constant frequency architecture that
can be programmed over a 200KHz to 2MHz range with a
single external timing resistor from the R T pin to ground.
The nominal voltage on the R T pin is 0.54V, and the
current that flows into the timing resistor is used to
charge and discharge an internal oscillator capacitor. A
graph for selecting the value of R T for a given operating
frequency is shown in Figure 6.
OPERATING FREQUENCY SELECTION
The choice of operating frequency is determined by sev-
eral factors. There is a tradeoff between efficiency and
component size. Higher switching frequency allows the
use of smaller inductors albeit at the cost of increased
switching losses and decreased efficiency.
Another consideration is the maximum duty cycle achiev-
able. In certain applications, the converter needs to oper-
ate at the maximum duty cycle in order to light up the
maximum number of LEDs. The LT3466 has a fixed
oscillator off-time and a variable on-time. As a result, the
maximum duty cycle increases as the switching frequency
is decreased.
The circuit of Figure 1 is operated with different values of
timing resistor (R T ). R T is chosen so as to run the
converters at 800kHz (R T = 63.4k), 1.25MHz (R T = 39.1k)
and 2MHz (R T = 20.5k). The efficiency comparison for
different R T values is shown in Figure 7.
1000
85
CIRCUIT OF FIGURE 1
V IN = 3.6V
80 8/8 LEDs
R T = 63.4k
R T = 39.1k
75
70
100
65
60
55
R T = 20.5k
10
200
600
1000
1400
1800
50
0
5
10
15
20
OSCILLATOR FREQUENCY (kHz)
3466 F06
Figure 6. Timing Resistor (R T ) Value
LED CURRENT (mA)
3466 F07
Figure 7. Efficiency Comparison for Different R T Resistors
3466fa
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3467 | 制造商:LINER 制造商全称:Linear Technology 功能描述:700mA Low Noise High Current LED Charge Pump |
| LT3467A | 制造商:LINER 制造商全称:Linear Technology 功能描述:700mA Low Noise High Current LED Charge Pump |
| LT3467AEDDB#PBF | 制造商:Linear Technology 功能描述:SP-SWREG/Monolithic, Cut Tape 1.1A, 2.1MHz Boost Converter |
| LT3467AEDDB#TRMPBF | 功能描述:IC REG BOOST ADJ 1.1A 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 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-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LT3467AEDDB#TRPBF | 功能描述:IC REG BOOST ADJ 1.1A 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 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-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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