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| 型号： | LT4356IMS-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/26页 |
| 文件大小： | 0K |
| 描述： | IC OVERVOLT PROT REG 10-MSOP |
| 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 |
| 电压 - 工作： | 4 ~ 80V |
| 电压 - 箝位： | 27V，可调 |
| 技术： | 混合技术 |
| 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 LT4356-3 DC1018B-B-ND - DEMO BOARD FOR LT4356-2 DC1018B-A-ND - DEMO BOARD FOR LT4356-1 |
LT4356-1/LT4356-2
APPLICATIONS INFORMATION
Layout Considerations
Next calculate the sense resistor, R SNS , value:
To achieve accurate current sensing, Kelvin connection
to the current sense resistor (R SNS in Figure 9) is recom-
mended. The minimum trace width for 1oz copper foil is
R SNS =
50mV
I LIM
=
50mV
5A
= 10m Ω
C TMR = = 50nF
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. Small resistances can cause large errors in
high current applications. Noise immunity will be improved
signi?cantly by locating resistive dividers close to the pins
with short V CC and GND traces.
C TMR is then chosen for 1ms of early warning time:
1ms ? 5μA
100mV
The closest standard value for C TMR is 47nF.
Finally, calculate R4 and R5 for the 6V low battery threshold
detection:
Design Example
As a design example, take an application with the follow-
ing speci?cations: V CC = 8V to 14V DC with transient up
6V =
1.25V ? ( R4 + R5 )
R5
to 80V, V OUT ≤ 16V, current limit (I LIM ) at 5A, low battery
Choose 100k for R5.
detection at 6V, and 1ms of overvoltage early warning
(Figure 9).
First, calculate the resistive divider value to limit V OUT to
R4 =
( 6V – 1.25V ) ? R5
1.25V
= 380k
1.25V ? ( R1 + R2 )
V REG = = 16V
t OC = = 0.878ms
16V during an overvoltage event:
R2
Set the current through R1 and R2 during the overvoltage
condition to 250μA.
1.25V
R2 = = 5k
250μA
Select 383k for R4.
The pass transistor, Q1, should be chosen to withstand
the output short condition with V CC = 14V.
The total overcurrent fault time is:
47nF ? 0.85V
45.5μA
The power dissipation on Q1 equals to:
( 16V – 1.25V ) ? R2
10m Ω
Choose 4.99k for R2.
R1 =
1.25V
= 58.88k
14V ? 50mV
P= = 70W
These conditions are well within the Safe Operating Area
The closest standard value for R1 is 59k.
of IRLR2908.
4356fa
17
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相关代理商/技术参数 |
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|---|---|
| LT4356IMS-3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Surge Stopper with Fault Latchoff |
| LT4356IMS-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 |
| LT4356IMS-3#PBF | 制造商:Linear Technology 功能描述:Hot Swap Controller IC |
| LT4356IMS-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 |
| LT4356IMS-3PBF | 制造商:Linear Technology 功能描述:Surge Protection Adj Regulator 4-80V 7uA |
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