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PDF HDSP-5323 Data sheet ( Hoja de datos )
| Número de pieza | HDSP-5323 | |
| Descripción | 14.2 mm (0.56 inch) Seven Segment Displays | |
| Fabricantes | Agilent(Hewlett-Packard) | |
| Logotipo | .gif "Agilent(Hewlett-Packard)"){kind=logo} |
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®
Application Specific Discretes
A.S.D.TM
HDP01-0512N
HARD DISK DRIVE
POWER SUPPLY PROTECTION
APPLICATIONS
PROTECTION FOR THE +5V AND +12V
POWER LINES OF:
- Hard disk drives
- Floppy disk drives
- CD-ROMs, CD-R, CD-RW
- DVDs
FEATURES
PROTECTION OF BOTH 5V AND 12V SUPPLY
RAILS.
MAXIMUM CURRENT ON THE 5V LINE 3A
DURING 1s.
MONOLITHIC INTEGRATION IN PLANAR
TECHNOLOGY.
DESCRIPTION
This device is dedicated to the protection of the
+5V power supply line against transient overvol-
tages due to surge of power rails up to the activa-
tion of the serial thermal protection element. It is
also dedicated to the protection of the +12V rail
against transient overvoltages.
GND
PL5
PL12
PL5
SOT223
BENEFITS
COMPONENT COUNT REDUCTION
PCB SURFACE REDUCTION
SIMPLIFIED SYSTEM PROTECTION DESIGN
BASIC APPLICATION DIAGRAM
Unprotected 5V
Protected 5V
PL12
PL5
Unprotected 12V
PL12
Protected 12V
PL5
HDP01-0512N
Gnd
OVERVOLTAGE
CLAMPING
OVERVOLTAGE
DETECTION
note: The element in series with the 5V line is a resettable device, like Raychem Polyswitch MiniSMD075.
TM : ASD is trademark of STMicroelectronics.
April 1999 - Ed: 6A
1/6
1 page  
HDP01-0512N
The ITSM 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 1µA 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.
Fig. A.3: Current and voltage characteristic of the
+12V protection.
I
The clamping voltage (Vcl) is depending on several
5 parameters which are :
- current induced by the transient (Ipp)
- ambient temperature effect (αT)
- breakdown voltage of the protection (VBR)
4 - dynamic resistance of the protection (Rd)
V
VCL
To evaluate the clamping voltage appearing on the +12V rail when a transient occurs, the next formula is
needed :
Vcl = VBRmax + Rd*IPP
with a typical Rd equals to 2.5Ω
IPP is the peak current given by the transient which is :
IPP = (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 1.2/50µs - 8/20µs, as defined by the standard
IEC1000-4-5, the Vcl is calculated as:
Vcl = 16 + 2.5*IPP and IPP = (50 - Vcl) / 42 RS = 42 Ω (generator impedance)
then it comes up with Vcl = 17.9V and IPP = 0.7A
The impact of the temperature on the clamping voltage can be considered as to be :
Vcl(T°C) = Vcl(25°C) * (1 + αT(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 IPP=0.7A, the
peak power is in that case 12.5W (Vcl*IPP) for a 20µs 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 @ 20µs) this tells us the +12V protection of the HDP01-0512N can easily withstand such a 12.5W
surge.
5/6
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet HDSP-5323.PDF ] | |
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