参数资料
| 型号： | LT4356CS-3#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC SURGE STOPPER ADJ 16-SOIC |
| 产品目录绘图： | LT4356 Output Graph LT4356 Series 16-SOIC |
| 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： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 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 |
LT4356-3
APPLICATIONS INFORMATION
V IN
12V
D2*
SMAJ58CA
R SNS
10m
Q2
Si4435
D1
1N5245
15V
Q1
IRLR2908
V OUT
12V, 3A
CLAMPED AT 16V
V IN
D2
SMAJ58A
R SNS
10m
Q1
IRLR2908
C L *
22μF
6
7
11
5
SNS
V CC
SHDN
A OUT
R6
10k
LT4356DE-3
R3
10
4
GATE
3
OUT
FB
FLT
2
8
R1
59k
R2
4.99k
R4
383k
R5
100k
UNDERVOLTAGE
6
7
12
11
V CC
SHDN
IN +
A OUT
R3
10
5 4 3
SNS GATE OUT
FB
LT4356DE-3
EN
FLT
GND
TMR
2
9
8
R1
59k
R2
4.99k
FAULT
V CC
DC-DC
CONVERTER
SHDN GND
IN
10 1
12 +
*DIODES INC.
GND
10
TMR
1
C TMR
0.1μF
EN
43563 F08
9
43563 F09
*SANYO 25CE22GA
C TMR
47nF
Figure 9. Overvoltage Regulator with Low-Battery Detection
Figure 8. Overvoltage Regulator with P-Channel MOSFET
Reverse Input Protection
Shutdown
The LT4356-3 can be shut down to a low current mode
when the voltage at the SHDN pin goes below the shutdown
threshold of 0.6V. The quiescent current drops to 7μA. All
functions are turned off including the auxiliary amplifier.
After the GATE pin pulls low due to a fault time out, the
LT4356-3 latches off. Allow sufficient time for the TMR pin
to discharge to 0.5V (typical discharge current is 2.2μA)
and for the MOSFET to cool before attempting to reset the
part. To reset, pull the SHDN pin low for at least 100μs,
then pull high with a slew rate of at least 10V/ms.
The SHDN pin can be pulled up to V CC or below GND by
up to 60V without damaging the pin. Leaving the pin open
allows an internal current source to pull it up and turn
on the part while clamping the pin to 2.5V. The leakage
current at the pin should be limited to no more than 1μA
if no pull up device is used to help turn it on.
Supply Transient Protection
The LT4356-3 is 100% tested and guaranteed to be safe
from damage with supply voltages up to 80V. Nevertheless,
voltage transients above 100V may cause permanent dam-
age. During a short-circuit condition, the large change in
current flowing through power supply traces and associated
wiring can cause inductive voltage transients which could
exceed 100V. To minimize the voltage transients, the power
trace parasitic inductance should be minimized by using
wide traces. A small surge suppressor, D2, in Figure 9,
at the input will clamp the voltage spikes.
A total bulk capacitance of at least 22μF low ESR is required
close to the source pin of MOSFET Q1. In addition, the
bulk capacitance should be at least 10 times larger than
the total ceramic bypassing capacitor on the input of the
DC/DC converter.
Layout Considerations
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
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
530μΩ/square. Small resistances can cause large errors in
high current applications. Noise immunity will be improved
significantly by locating resistive dividers close to the pins
with short V CC and GND traces.
Design Example
As a design example, take an application with the following
specifications: V CC = 8V to 14V DC with transient up to 80V,
V OUT ≤ 16V, current limit (I LIM ) at 5A, low battery detection
at 6V, and 1ms of overvoltage early warning (Figure 9).
43563fb
15
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| LT4356HDE-1#PBF | 功能描述:IC OVERVOLT PROT REG 12-DFN 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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