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參數(shù)資料
| 型號： | HDP01-0512NRL |
| 廠商： | 意法半導體 |
| 英文描述： | HARD DISK DRIVE POWER SUPPLY PROTECTION |
| 中文描述： | 硬盤驅動器電源保護 |
| 文件頁數(shù)： | 5/6頁 |
| 文件大?。?/td> | 86K |
| 代理商： | HDP01-0512NRL |
The I
TSM
value as a function of the pulse duration tp for the HDP01 device is given on the figure 1 of this
datasheet.
In the case the supply cables of the +12V and +5V are reversed, the +5V (PL5) internal protection of the
HDP01-512N immediately shorts circuits +5V rail and ensures on efficient protection of the electronic mod-
ule.
ABOUT THE +12V PROTECTION
The +12V internal protection (PL12 termination) eliminates all transients appearing on the +12V supply rail.
In normal conditions (region 4 of figure A.3) its leakage current is 1
μ
A maximum at 12V @ 25°C. When a
surge occurs on the +12V rail, the overvoltage is clamped (region 5) and the electronic module connected
to this rail is protected.
The clamping voltage (Vcl) is depending on several
parameters which are :
- current induced by the transient (Ipp)
- ambient temperature effect (
α
T)
- breakdown voltage of the protection (V
BR
)
- dynamic resistance of the protection (Rd)
To evaluate the clamping voltage appearing on the +12V rail when a transient occurs, the next formula is
needed :
Vcl = V
BR
max + Rd*I
PP
with a typical Rd equals to 2.5
I
PP
is the peak current given by the transient which is :
I
PP
= (Vtransient - Vcl)/Rs
Vtransient = peak voltage of the transient
Rs is the series resistance of the surge generator.
If, for example, we consider a 50V combined surge 1.2/50
μ
s - 8/20
μ
s, as defined by the standard
IEC1000-4-5, the Vcl is calculated as:
Vcl = 16 + 2.5*I
PP
and I
PP
= (50 - Vcl) / 42 R
S
= 42
(generator impedance)
then it comes up with Vcl = 17.9V and I
PP
= 0.7A
The impact of the temperature on the clamping voltage can be considered as to be :
Vcl(T°C) = Vcl(25°C) * (1 +
α
T(T°C-25°C)) where T°C is the ambient temperature for which the module shall
run.
The HDP01-0512N +12V protection has a power dissipation capability that is given in the figure 2 of this
datasheet named "Peak pulse power versus exponential pulse duration". This figure is necessary to deter-
mine if the power involved in the +12V protection does not exceed the maximum power the HDP01 +12V
protection can support. For example, considering the last calculation where Vcl=17.9 and I
PP
=0.7A, the
peak power is in that case 12.5W (Vcl*I
PP
) for a 20
μ
s exponential surge duration. If we compare this value
to the curve of figure 2, then we see the dissipated power is much lower than the +12V protection limit
(200W @ 20
μ
s) this tells us the +12V protection of the HDP01-0512N can easily withstand such a 12.5W
surge.
Fig. A.3:
Current and voltage characteristic of the
+12V protection.
I
V
V
CL
5
4
HDP01-0512N
5/6
相關PDF資料 |
PDF描述 |
|---|---|
| HDP01-0512N | HARD DISK DRIVE POWER SUPPLY PROTECTION |
| HDSP-078X | Glass/Ceramic Numeric and Hexadecimal Displays for Industrial Applications |
| HDSP-0793 | Glass/Ceramic Numeric and Hexadecimal Displays for Industrial Applications |
| HDSP-079X | Glass/Ceramic Numeric and Hexadecimal Displays for Industrial Applications |
| HDSP-098X | Glass/Ceramic Numeric and Hexadecimal Displays for Industrial Applications |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| HDP126-1000-JBW | 制造商:RCD Components Inc 功能描述:HI DENS PWR RES 25W 100 OHM 5% BULK |
| HDP126-1001-JBW | 制造商:RCD Components Inc 功能描述:HI DENS PWR RES 25W 1.0K 5% BULK |
| HDP126-1002-JBW | 制造商:RCD Components Inc 功能描述:HI DENS PWR RES 25W 10K 5% BULK |
| HDP126-10R0-JBW | 制造商:RCD Components Inc 功能描述:HI DENS PWR RES 25W 10 OHM 5% BULK |
| HDP126-1100-JBW | 制造商:RCD Components Inc 功能描述:HI DENS PWR RES 25W 110 OHM 5% BULK |
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