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參數(shù)資料
| 型號： | DALC208 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | LOW CAPACITANCE DIODE ARRAY |
| 中文描述： | 低電容二極管陣列 |
| 文件頁數(shù)： | 4/10頁 |
| 文件大?。?/td> | 164K |
| 代理商： | DALC208 |
The DALC208SC6 is particularly optimized to
perform surge protection based on the rail to rail
topology.
The clamping voltage V
CL
can be calculated as
follow :
V
CL
+ = V
REF2
+ V
F
V
CL
- = V
REF1
-
V
F
for positive surges
for negative surges
with : V
F
= V
t
+ rd.Ip
(V
F
forward drop voltage) / (V
t
forward drop
threshold voltage)
According to the curve Fig.5 on page 3, we
assume that the value of the dynamic resistance of
the clamping diode is typically rd = 0.7
and V
t
=
1.2V.
For an IEC 1000-4-2 surge Level 4 (Contact
Discharge: Vg=8kV, Rg=330
), V
REF2
= +5V,
V
REF1
= 0V, and if in first approximation, we
assume that : Ip=Vg/Rg
≈
24A.
So, we find:
V
CL
+
≈
+23V
V
CL
-
≈
-18V
Note:
the calculations do not take into account
phenomena due to parasitic inductances
APPLICATION EXAMPLE
If we consider that the connections from the pin
REF
2
to V
CC
and from REF
1
to GND are done by
two tracks of 10mm long and 0.5mm large; we
assume that the parasitic inductances of these
tracks are about 6nH.
So when an IEC 1000-4-2 surge occurs, due to the
rise time of this spike (tr=1ns), the voltage V
CL
has
an extra value equal to Lw.dI/dt.
The dI/dt is calculated as: di/dt = Ip/tr
≈
24 A/ns
The overvoltage due to the parasitic inductances
is: Lw.di/dt = 6 x 24
≈
144V
By taking into account the effect of these parasitic
inductances due to unsuitable layout, the clamping
voltage will be :
V
CL
+ = +23 + 144
≈
167V
V
CL
- = -18 - 144
≈
-162V
We can reduce as much as possible these
phenomena with simple layout optimization.
It’s the reason why some recommendations have
to be followed (see paragraph "How to ensure a
good ESD protection").
TECHNICAL INFORMATION
SURGE PROTECTION
Fig. A1:
ESD behavior; parasitic phenomena due to unsuitable
layout.
Lw
VI/O
ESD
SURGE
REF1=GND
I/O
REF2=+Vcc
Vf
Lwdi
dt
Lwdi
dt
Vcl+ = Vcc+Vf+Lwdi
dt
surge >0
-Vf- Lwdi
dt
surge <0
Vcl- =
t
tr=1ns
Vcc+Vf
Lwdi
dt
Vcl+
POSITIVE
SURGE
167V
-Lwdi
dt
t
tr=1ns
-Vf
Vcl-
NEGATIVE
SURGE
-162V
DALC208SC6
4/10
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DALC208SC6 | Switch Mode Power Supply; Output Power:120W; No. of Outputs:1; Output 1 VDC +:24VDC; Output Current 1:5A; Power Supply Mounting:Chassis; Leaded Process Compatible:Yes; Output Current:5A; Output Power Max:120W; Output Voltage:24VDC RoHS Compliant: Yes |
| DAMB5111 | Analog IC |
| DAP08 | DIN PLUG ASSY TYPE |
| DAP403 | |
| DAN403 | Small Signal Diode Arrays |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DALC208SC6 | 功能描述:TVS二極管陣列 8 Diode Array RoHS:否 制造商:Littelfuse 極性: 通道:4 Channels 擊穿電壓: 鉗位電壓:11.5 V 工作電壓:2.5 V 峰值浪涌電流:20 A 安裝風(fēng)格:SMD/SMT 端接類型:SMD/SMT 系列: 最小工作溫度:- 40 C 最大工作溫度:+ 85 C |
| DALC208SC6 | 制造商:STMicroelectronics 功能描述:IC - Transil Array |
| DALC208SC6-CUT TAPE | 制造商:ST 功能描述:DALC208 Series 4 Channel Bi Directional Diode Array SMT - SOT-23-6 |
| DALC-J15PAF-10L6E | 制造商:Japan Aviation Electronics (JAE) 功能描述:Conn D-Subminiature PIN 15 POS Solder RA Thru-Hole 15 Terminal 1 Port 制造商:JAE Electronics 功能描述:Connectors, D-sub |
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