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参数资料
| 型号： | LT4356CMS-1#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封装： | PLASTIC, MSOP-10 |
| 文件页数： | 9/26页 |
| 文件大小： | 231K |
| 代理商： | LT4356CMS-1#TR |
LT4356-1/LT4356-2
17
4356fa
Layout Considerations
To achieve accurate current sensing, Kelvin connection
to the current sense resistor (RSNS in Figure 9) is recom-
mended. The minimum trace width for 1oz copper foil is
0.02" per amp to ensure the trace stays at a reasonable
temperature. 0.03" per amp or wider is recommended.
Note that 1oz copper exhibits a sheet resistance of about
530μ
Ω/square.Smallresistancescancauselargeerrorsin
high current applications. Noise immunity will be improved
signicantly by locating resistive dividers close to the pins
with short VCC and GND traces.
Design Example
As a design example, take an application with the follow-
ing specications: VCC = 8V to 14V DC with transient up
to 80V, VOUT ≤ 16V, current limit (ILIM) at 5A, low battery
detection at 6V, and 1ms of overvoltage early warning
(Figure 9).
First, calculate the resistive divider value to limit VOUT to
16V during an overvoltage event:
VREG =
1.25V R1 + R2
()
R2
= 16V
Set the current through R1 and R2 during the overvoltage
condition to 250μA.
R2 =
1.25V
250μA
= 5k
Choose 4.99k for R2.
R1 =
16V – 1.25V
() R2
1.25V
= 58.88k
The closest standard value for R1 is 59k.
Next calculate the sense resistor, RSNS, value:
RSNS =
50mV
ILIM
=
50mV
5A
= 10m
Ω
CTMR is then chosen for 1ms of early warning time:
CTMR =
1ms 5μA
100mV
= 50nF
The closest standard value for CTMR is 47nF.
Finally, calculate R4 and R5 for the 6V low battery threshold
detection:
6V =
1.25V R4 + R5
()
R5
Choose 100k for R5.
R4 =
6V – 1.25V
() R5
1.25V
= 380k
Select 383k for R4.
The pass transistor, Q1, should be chosen to withstand
the output short condition with VCC = 14V.
The total overcurrent fault time is:
tOC =
47nF 0.85V
45.5μA
= 0.878ms
The power dissipation on Q1 equals to:
P =
14V 50mV
10m
Ω
= 70W
These conditions are well within the Safe Operating Area
of IRLR2908.
APPLICATIONS INFORMATION
相关PDF资料 |
PDF描述 |
|---|---|
| LT4356CDE-2#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12 |
| LT4356IDE-1#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12 |
| LT4356HDE-2#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12 |
| LT4356HMS-1 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| LT4356CDE-1#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT4356CMS-1-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Overvoltage Protection Regulator and Inrush Limiter |
| LT4356CMS-3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Surge Stopper with Fault Latchoff |
| LT4356CMS-3#PBF | 功能描述:IC SURGE STOPPER W/LATCH 10MSOP RoHS:是 类别:过电压，电流，温度装置 >> 电涌抑制 IC 系列:- 产品培训模块:LT4356 Surge Stopper 产品目录绘图:LT4356 Output Graph LT4356 Series 10-MSOP 标准包装:2,500 系列:- 电压 - 工作:4 ~ 80V 电压 - 箝位:27V，可调 技术:混合技术 功率（瓦特）:- 电路数:1 应用:自动 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:带卷 (TR) 配用:DC1018B-C-ND - DEMO BOARD FOR LT4356-3DC1018B-B-ND - DEMO BOARD FOR LT4356-2DC1018B-A-ND - DEMO BOARD FOR LT4356-1 |
| LT4356CMS-3#PBF | 制造商:Linear Technology 功能描述:Hot Swap Controller IC |
| LT4356CMS-3#TRPBF | 功能描述:IC SURGE STOPPER ADJ 10-MSOP RoHS:是 类别:过电压，电流，温度装置 >> 电涌抑制 IC 系列:- 产品培训模块:LT4356 Surge Stopper 产品目录绘图:LT4356 Output Graph LT4356 Series 10-MSOP 标准包装:2,500 系列:- 电压 - 工作:4 ~ 80V 电压 - 箝位:27V，可调 技术:混合技术 功率（瓦特）:- 电路数:1 应用:自动 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:带卷 (TR) 配用:DC1018B-C-ND - DEMO BOARD FOR LT4356-3DC1018B-B-ND - DEMO BOARD FOR LT4356-2DC1018B-A-ND - DEMO BOARD FOR LT4356-1 |
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