|
|
PDF HV101 Data sheet ( Hoja de datos )
| Número de pieza | HV101 | |
| Descripción | Inrush Current Limiter Controllers | |
| Fabricantes | Supertex Inc | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de HV101 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
|
No Preview Available !
Supertex inc.
3-Pin Hotswap,
Inrush Current Limiter Controllers
(Negative Supply Rail)
HV101
Features
►►Pass element is only external part
►►No sense resistor required
►►Auto-adapt to pass element
►►Short circuit protection
►►UV & POR supervisory circuits
►►2.5s auto retry
►►±10V to ±72V input voltage range
►►0.6mA typical operating supply current
►►Built in clamp for AC path turn-on glitch
General Description
The HV101 is a 3-pin hotswap controller available in the SOT-
223 package, which requires no external components other
than a pass element. The HV101 contains many of the features
found in hotswap controllers with 8 pins or more, and which
generally require many external components. These features
include undervoltage (UV) detection circuits, power on reset
(POR) supervisory circuits, inrush current limiting, short cir-
cuit protection, and auto-retry. In addition, the HV101 uses a
patent pending mechanism to sample and adapt to any pass
element, resulting in consistent hotswap profiles without any
programming.
Applications
►►-48V central office switching (line cards)
►►+48V server networks
►►+48V storage area networks
►►+48V peripherals, routers, switches
►►+24V cellular and fixed wireless (bay stations,
line cards)
►►+24V industrial systems
►►+24V UPS systems
►►-48V PBX & ADSL systems (line cards)
►►Distributed power systems
►►Powered ethernet for VoIP
Typical Application Circuit
GND
-48V
VPP
GATE
VNN
HV101
IRF530
400µF
DC/DC
Converter
+5.0V
COM
Doc.# DSFP-HV101
B060513
Supertex inc.
www.supertex.com
1 page  
HV101
Application Information
Turn On Clamp
Hotswap controllers using a MOSFET as the pass element
all include a capacitor divider from VPP to VNN through
CLOAD, CRSS and CGS. In most competitive solutions a large
external capacitor is added to the GATE of the pass element
to limit the voltage on the GATE resulting from this divider. In
those instances, if a GATE capacitor is not used the internal
circuitry is not available to hold off the GATE, and therefore
a fast rising voltage input will cause the pass element to turn
on for a moment. This allows current spikes to pass through
the MOSFET.
The HV101 includes a built-in clamp to ensure that this spuri-
ous current glitch does not occur. The built-in clamp will work
for the time constants of most mechanical connectors. There
may be applications, however, that have rise times that are
much less than 1.0µs (100’s of ns). In these instances it may
be necessary to add a capacitor from the MOSFET GATE to
source to clamp the GATE and suppress this current spike.
In these cases the current spike generally contains very little
energy and does not cause damage even if a capacitor is not
used at the GATE.
Typically if MOSFETs of the same type are used, the hotswap
results will be extremely consistent. If different types are used
they will usually exhibit minimal variation.
Short Circuit Protection
The HV101 provides short circuit protection by shutting down
if the Miller Effect associated with hotswap does not occur.
Specifically, if the output is shorted then the GATE will rise
without exhibiting a “flat response”. Due to the fact that we
have normalized the hotswap period for any pass element, a
timer can be used to detect if the GATE voltage rises above
a threshold within that time, indicating that a short exists. The
diagram below shows a typical turn on sequence with the load
shorted, resulting in a peak current of 4A.
Auto-adapt Operation
The HV101 auto-adapt mechanism provides an important
function. It normalizes the hotswap period regardless of pass
element or load capacitor for consistent hotswap results. By
doing this it allows the novel short circuit mechanism to work
because the mechanism requires a known time base.
The maximum current that may occur during this period can
be controlled by adding a resistor in series with the source of
the MOSFET. The lower graph shows the same circuit with
a 100mΩ resistor inserted between source and VNN. In this
case the maximum current is 25% smaller.
The above diagram illustrates the effectiveness of the auto-
adapt mechanism. In this example three MOSFETs with dif-
ferent CISS and RDSON values are used. The top waveform is
the hotswap current, while the bottom waveform is the GATE
voltage. As can be seen, the hotswap period is normalized,
the initial slope of the GATE voltage is approximately 2.5V/ms
regardless of the MOSFET, and the total hotswap period and
peak currents are a function of a MOSFET type dependent
constant multiplied by CLOAD.
For most applications and pass elements, the HV101 provides
adequate limiting of the maximum current to prevent damage
without the need for any external components. The 2.5s delay
of the auto-retry circuit provides time for the pass element to
cool between attempts.
Auto-Retry
Not only does the HV101 provide short circuit protection in a
3-pin package, they also includes a 2.5s built in auto-restart
timer. The HV101 will continuously try to turn on the system
Doc.# DSFP-HV101
B060513
Supertex inc.
5 www.supertex.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet HV101.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| HV10-10F | Diode (spec sheet) |  American Microsemiconductor |
| HV10-12F | Diode (spec sheet) | American Microsemiconductor |
| HV10-15F | Diode (spec sheet) | American Microsemiconductor |
| HV10-20F | Diode (spec sheet) | American Microsemiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |