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参数资料
| 型号： | LT3782AEFE#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO28 |
| 封装： | 4.40 MM, PLASTIC, TSSOP-28 |
| 文件页数： | 7/20页 |
| 文件大小： | 233K |
| 代理商： | LT3782AEFE#TR |
LT3782A
15
3782af
3. The I2R losses in the sense resistor can be calculated
almost by inspection.
PR(SENSE) =
IO(MAX)
2
1– DMAX
2
R DMAX
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:
PR(WINDING) =
IO(MAX)
2
1– DMAX
2
RW
5. Losses in the boost diode. The power dissipation in the
boost diode is:
P
DIODE =
I
O(MAX)
2
V
D
The boost diode can be a major source of power loss
in a boost converter. For 13.2V input, 42V output at 3A,
a Schottky diode with a 0.4V forward voltage would
dissipate 600mW, which represents about 1% of the
input power. Diode losses can become signicant at
low output voltages where the forward voltage is a
signicant percentage of the output voltage.
6. Other losses, including CIN and CO ESR dissipation and
inductor core losses, generally account for less than
2% of the total losses.
PCB Layout Considerations
To achieve best performance from an LT3782A circuit, the
PC board layout must be carefully done. For lower power
applications, a two-layer PC board is sufcient. However,
at higher power levels, a multiplayer PC board is recom-
mended. Using a solid ground plane under the circuit is
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.
For best electrical performance, the LT3782A circuit should
be laid out as follows:
Place all power components in a tight area. This will
minimize the size of high current loops. Orient the input
and output capacitors and current sense resistors in a way
that minimizes the distance between the pads connected
to ground plane.
Place the LT3782A and associated components tightly to-
gether and next to the section with power components.
Use a local via to ground plane for all pads that connect to
ground. Use multiple vias for power components.
Connect the current sense inputs of LT3782A directly
to the current sense resistor pads. Connect the current
sense traces on the opposite sides of pads from the traces
carrying the MOSFETs source currents to ground. This
technique is referred to as Kelvin sensing.
APPLICATIONS INFORMATION
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| LT3782AEUFD | SWITCHING CONTROLLER, PQCC28 |
| LT4356CMS-1#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| LT4356CDE-2#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3782AEFE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller |
| LT3782AEUFD | 制造商:LINER 制造商全称:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller |
| LT3782AEUFD#PBF | 功能描述:IC REG CTRLR BST PWM CM 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
| LT3782AEUFD#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 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:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LT3782AEUFD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller |
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