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| 型号： | LT3782IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 28-SSOP |
| 标准包装： | 2,000 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 533kHz |
| 占空比： | 94% |
| 电源电压： | 6 V ~ 40 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
LT3782
APPLICATIONS INFORMATION
2. Power MOSFET switching and conduction losses:
5. Losses in the boost diode. The power dissipation in the
I O(MAX)
2
boost diode is:
P FET =
2
1– D MAX
? R DS(ON) ? D MAX ?
T
P DIODE =
I O(MAX)
2
? V D
I O(MAX)
The boost diode can be a major source of power loss
in a boost converter. For 13.2V input, 42V output at 3A,
+ k ? V O2 ?
2
1– D MAX
? C RSS ? f
a Schottky diode with a 0.4V forward voltage would
dissipate 600mW, which represents about 1% of the
input power. Diode losses can become signi?cant at
3. The I 2 R losses in the sense resistor can be calculated
almost by inspection.
low output voltages where the forward voltage is a
signi?cant percentage of the output voltage.
P R(SENSE) =
I O(MAX)
2
1– D MAX
2
? R ? D MAX
6. Other losses, including C IN and C O ESR dissipation and
inductor core losses, generally account for less than
2% of the total losses.
PCB Layout Considerations
4. The losses in the inductor are simply the DC input cur-
rent squared times the winding resistance. Expressing
this loss as a function of the output current yields:
To achieve best performance from an LT3782 circuit, the
PC board layout must be carefully done. For lower power
applications, a two-layer PC board is suf?cient. However,
I O(MAX)
2
at higher power levels, a multiplayer PC board is recom-
mended. Using a solid ground plane under the circuit is
P R(WINDING) =
2
1– D MAX
? R W
the easiest way to ensure that switching noise does not
affect the operation.
In order to help dissipate the power from MOSFETs and
diodes, keep the ground plane on the layers closest to the
layers where power components are mounted. Use power
planes for MOSFETs and diodes in order to improve the
spreading of the heat from these components into the
PCB.
3782fg
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3791 | 制造商:LINER 制造商全称:Linear Technology 功能描述:60V 4-Switch Synchronous |
| LT3791-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:40VIN LED Converter with Internal PWM Generator Wide VIN Range: 4.5V to 40V |
| LT3791EFE#PBF | 功能描述:IC LED DRVR CONTROL 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:True Color PWM™ 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 |
| LT3791EFE#TRPBF | 功能描述:IC LED DRVR CONTROL 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:True Color PWM™ 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LT3791EFE-1#PBF | 制造商:Linear Technology 功能描述:LED DRVR 9V/12V/15V/18V/24V 38-Pin TSSOP EP 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK BST 38TSSOP 制造商:Linear Technology 功能描述:BUCK/BOOST 4.7/60V 700KHZ 3 制造商:Linear Technology 功能描述:BUCK/BOOST, 4.7/60V, 700KHZ, 38TSSOP 制造商:Linear Technology 功能描述:PWM CONTROLLER, BUCK-BOOST, 700KHZ, 60V, TSSOP-38; Input Voltage:60V; Output Current:10A; Digital IC Case Style:TSSOP; No. of Pins:38; Frequency:700kHz; Operating Temperature Min:-40C; Operating Temperature Max:125C ;RoHS Compliant: Yes |
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