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HV301LG-P031-G

Description
Hot-swappable power distribution-10 to -90v activ Hi
Categorysemiconductor    Other integrated circuit (IC)   
File Size916KB,13 Pages
ManufacturerSupertex
Environmental Compliance
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HV301LG-P031-G Overview

Hot-swappable power distribution-10 to -90v activ Hi

HV301
Hot Swap Controller
Features
10 to 90V operation, positive or negative
supply
UV/OV lock out & power-on-reset
Circuit breaker
100ms startup timer
Automatic retry or latched operation
Low Power, 400µA sleep mode
8-Lead SOIC Package
General Description
The Supertex HV301 Hot Swap Controller provides inrush current limiting and
other power supply support functions for hot swap equipment. Current limiting is
provided by control of an external MOSFET which is placed in the return line of
the power supply connection. Placement in the return allows use of an N-channel
MOSFET without the need for high side driving.
An internal clamp at the GATE pin activates when full bias for the HV301 is not
available, thus keeping the MOSFET in the off-state during the initial insertion
phase. As soon as adequate bias is available for the main control circuits, the UV
(undervoltage) and OV (overvoltage) pins check for normal operating voltage on
the power supply input.
Once normal operating voltage is present, the GATE voltage for the external
MOSFET ramps up at a constant rate. The rate is controlled by the value of an
external capacitor placed at the RAMP pin. At some point the external MOSFET
channel is enhanced, allowing power supply current to flow, thereby energizing
downstream power supply capacitors.
During the GATE ramp up the power supply current is monitored with the aid
of an external sense resistor which forces reduction in the ramp rate when the
power supply current reaches a set limit. The limit is set by the value of the
external sense resistor and the threshold of the current sense amplifier (50mV).
Once inrush current subsides or the drain voltage ceases to drop, the GATE
voltage resumes its rise to the output voltage of an internal regulator V
REG
, with
an output voltage ranging from 8.5 to 12V. When GATE is within 1.2V of V
REG
,
GATE is pulled high to V
REG
with an internal switch, the open-drain PWRGD pin
is released to high impedance, and the HV301 enters a low power mode.
The HV301 includes a start-up timer and a circuit breaker function to protect the
MOSFET from excessive power dissipation. The start-up timer trips when the
start-up phase exceeds 100ms. The circuit breaker trips at double the current
limit threshold (100mV). Upon tripping of either the start-up timer or the circuit
breaker the MOSFET is turned off, and the PWRGD pin is pulled low. Thereafter,
a programmable automatic retry timer allows the MOSFET to cool down before
resetting and restarting. The automatic retry can be disabled by adding an
external resistor at the RAMP pin (about 2.5MΩ, see applications section).
Applications
48V central office switching
24V cellular and fixed wireless systems
24V PBX systems
Line cards
48V powered ethernet for VoIP
Distributed power systems
Power supply control
48V storage networks
Electronic circuit breaker
Typical Application Circuit
GND
R1
487kΩ
R2
6.81kΩ
8
VDD
3
UV
PWRGD
1
ENABLE
HV301
SENSE
GATE
+5.0V
C
LOAD
2
OV
VEE
RAMP
C1
10nF
7
DC/DC
PWM
CONVERTER
COM
R3
9.76kΩ
-48V
4
5
6
-48V
R4
12.5mΩ
Q1
IRF530
NOTES:
1. Undervoltage threshold (UV) set to 35V.
2. Overvoltage threshold (OV) set to 65V.
3. Startup current set to 4A.
4. Circuit breaker set to 8A.
5. 100ms max startup time.
6. Automatic retry enabled.
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: 408-222-8888
www.supertex.com

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