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参数资料
| 型号： | ZXLD1374EST20TC |
| 厂商： | Diodes Inc |
| 文件页数： | 18/39页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR BUCK BOOST 20TSSOP |
| 标准包装： | 1 |
| 拓扑： | 低端，PWM，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，通用 |
| 类型 - 次要： | 高亮度 LED（HBLED） |
| 频率： | 300kHz ~ 1MHz |
| 电源电压： | 6.3 V ~ 60 V |
| 输出电压： | 60V |
| 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： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | ZXLD1374EST20TCDIDKR |
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A Product Line of
Diodes Incorporated
ZXLD1374
Application Information (cont.)
Duty Cycle Calculation and Topology Selection
The duty cycle is a function of the input and output voltages. Approximately, the MOSFET switching duty cycle is
D BUCK ≈
V OUT
V IN
for Buck
D BOOST ≈
V OUT ? V IN
V OUT
for Boost
Equation 6
D BB ≈
V OUT
V OUT + V IN
for Buck-Boost
Because D must always be a positive number less than 1, these equations show that
V OUT < V IN
V OUT > V IN
V OUT > or = or < V IN
for Buck (voltage step-down)
for Boost (voltage step-up)
for Buck-boost (voltage step-down or step-up)
This allows us to select the topology for the required voltage range.
More exact equations are used in the web Calculator. These are:
D BUCK =
V OUT + V F + I OUT ( R S + R COIL )
V IN + V F ? V DSON
for Buck
D BOOST =
V OUT ? V IN + I IN ( R S + R COIL ) + V F
V OUT + V F ? V DSON
for Boost
Equation 7
D BB =
V OUT + V F + ( I IN + I OUT )( R S + R COIL )
V OUT + V IN + V F ? V DSON
for Buck-Boost
where
V F
V DSON
R COIL
= schottky diode forward voltage, estimated for the expected coil current, I COIL
= MOSFET drain source voltage in the ON condition (dependent on R DSON and drain current = I COIL )
= DC winding resistance of L1
The additional terms are relatively small, so the exact equations will only make a significant difference at lower operating voltages at the input
and output, i.e. low input voltage or a small number of LEDs connected in series. The estimates of V F and V DSON depend on the coil current.
The mean coil current, I COIL depends upon the topology and upon the mean terminal currents as follows:
I COIL = I LED
for Buck
I COIL = I IN
I COIL = I IN + I LED
for Boost
for Buck-Boost
Equation 8
I LED is the target LED current and is already known. I IN will be calculated with some accuracy later, but can be estimated now from the electrical
power efficiency.
ZXLD1374
Document number: DS35032 Rev. 3 - 2
18 of 39
www.diodes.com
September 2012
? Diodes Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ZXLD1601 | 制造商:ZETEX 制造商全称:ZETEX 功能描述:ADJUSTABLE DC - DC BOOST CONVERTER WITH INTERNAL SWITCH IN SC70 |
| ZXLD1601H6 | 制造商:Diodes Incorporated 功能描述:LCD/OLED BIAS BOOST CONVERTER SMD |
| ZXLD1601H6TA | 功能描述:开关变换器、稳压器与控制器 Boost Converter for LCD and OLED BIAS RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| ZXLD1601H6TC | 功能描述:开关变换器、稳压器与控制器 Boost Converter for LCD and OLED BIAS RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| ZXLD1615 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:ADJUSTABLE DC-DC BOOST CONVERTER WITH INTERNAL SWITCH IN |
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