Inrush Limiter/Circuit Breaker/Hotswap Controller IC
(No External Parts Required)
Features
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No External Parts Required
On Board 80V, 2A MOSFET
No Rsense Needed
鹵8.0V
to
鹵80V
Input Voltage Range
Two Level Current Limiting
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1.2A Initial Inrush Limit
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2.0A Second Inrush Limit/Circuit Breaker Triggers
Servo Limit to 1.2A for T
oc
then shuts down
Fast Response Current Limit when Over Current or Step
Voltage at Input Supply (eg. Diode 鈥極R鈥檌ng)
UVLO/ENABLE & POR Supervisory Circuits
Programmable UVLO
Over Current Protection
9.0sec Auto Retry
Built in Thermal Shutdown with Hysteresis
80V Open Drain PWRGD bar Flag
Thermally Rugged DPAK5 Package
Description
The HV111 is a complete power management solution for
switched or pluggable backplane applications up to 1.65A,
running from 鈥?.0 to -80V, requiring no external components
or programming in many applications.
The HV111 is not
limited to only negative input voltages. It can also be
used in +8.0 to +80V systems.
An internally programmed supervisor UVLO/ ENABLE may
be overridden with external resistors for custom settings.
Satisfying this supervisor will begin a POR phase to ensure
de-bouncing. Thereafter, a servo loop controls an internal
80V, 2A pass element to limit current. The circuit uses
internal mirrors to measure current, eliminating the need for
a sense resistor.
The HV111 includes two current modes: i) initial current limit
mode limits the current to 1.2A during turn on; ii) thereafter a
2A monitor circuit will re-trigger the servo mechanism back
to 1.2A limit if it is tripped. An on-board thermal supervisor
ensures that the device can never be damaged by over
current conditions.
Circuit breaker functionality is obtained through a either a
current limit timeout or a PWM current limiter for severe
faults. If the servo limits for more than 75ms then the part
will shut down the pass element, and initiate a 9sec timer
after which the turn on sequence will restart.
The HV111 is available in a thermally rugged DPAK-5
package which provides improved thermal resistance when
compared to SO-8 based solutions.
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Applications
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Power Ethernet Systems
Routers, Switches
Chargers
Security Peripherals & Cameras
Automotive Protection
Negative Supply Rail Breaking Applications
Networking Line Cards
Telecom Line Cards
Typical Schematics and Waveforms
INRUSH
PWRGD
*
DRAIN
*
GND*
*Referred to 鈥?8V
7/24/03
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate
"products liability indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined
to be defective due to workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest
product specifications, refer to the Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the
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