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参数资料
| 型号： | DC1018B-B |
| 厂商： | Linear Technology |
| 文件页数： | 17/26页 |
| 文件大小： | 0K |
| 描述： | DEMO BOARD FOR LT4356-2 |
| 设计资源： | DC1018B Design File DC1018B Schematic |
| 标准包装： | 1 |
| 主要目的： | 过压防护 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | LT4356-2 |
| 已供物品： | 板 |
| 相关产品： | LT4356HDE-3-ND - IC REG OVP FAULT TIMER 12DFN LT4356HS-3#PBF-ND - IC REG OVP W/LATCHOFF 16SOIC LT4356HMS-3#PBF-ND - IC REG OVP W/LATCHOFF 10-MSOP LT4356HDE-3#PBF-ND - IC REG OVP W/LATCHOFF 12DFN LT4356HS-3#TRPBF-ND - IC REG OVP FAULT TIMER 16SOIC LT4356HMS-3#TRPBF-ND - IC REG OVP FAULT TIMER 10MSOP LT4356HDE-3#TRPBF-ND - IC REG OVP FAULT TIMER 12DFN LT4356MPS-2#TRPBF-ND - IC SURGE STOPPER ADJ 16-SOIC LT4356MPS-1#TRPBF-ND - IC SURGE STOPPER ADJ 16-SOIC LT4356MPMS-1#TRPBF-ND - IC SURGE STOPPER ADJ 10-MSOP 更多... |
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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| DC1018B-C | 功能描述:DEMO BOARD FOR LT4356-3 RoHS:否 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:数字电位器 嵌入式:- 已用 IC / 零件:AD5258 主要属性:- 次要属性:- 已供物品:板 相关产品:AD5258BRMZ1-ND - IC POT DGTL I2C1K 64P 10MSOPAD5258BRMZ10-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ100-ND - IC POT DGTL I2C 100K 64P 10MSOPAD5258BRMZ50-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ1-R7-ND - IC POT DGTL I2C 1K 64P 10MSOPAD5258BRMZ10-R7-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ50-R7-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ100-R7-ND - IC POT DGTL I2C 100K 64P 10MSOP |
| DC101-BB-B | 制造商:Carling Technologies 功能描述:D-SERIES TOGGLE SWITCH - Bulk |
| DC101-PB-B | 制造商:Carling Technologies 功能描述:D-SERIES TOGGLE SWITCH - Bulk |
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