LX7712
Overview
The LX7712 is a power line protection device that is used for spacecraft power distribution. It provides a means to turn on or off a DC load with current up to 5A. The LX7712 is an integrated circuit which includes a solid state P Channel MOSET switch and catch diode; integration allows the temperature of the switch to trigger an optional thermal shutdown. It can be configured as a latch-able current limiter or a fold-back current limiter. Multiple devices can be paralleled in a master/slave arrangement to increase the current rating. The LX7712 can be programmed with just a few external components. The package is a 48 pin hermetic HTF.
The latch-able current limiter can be configured to latch off in a fault or to attempt to restart in a hiccup mode. A fault time integrating function remembers the cumulative effect of short fault pulses. The fault timer can be configured to have a fixed duration or a duration that is a function of the voltage drop from line-to-load across the device. A resistor programmable timer discharge function can insure the device has had adequate time to dissipate excess energy before attempting to restart.
In fold-back current limit mode the profile of the fold-back load current versus load voltage curve is resistor programmable. It is also possible to configure the fold-back feature for bi-stable operation; applying an overload forces the current limit to a safe trickle level and when the fault is corrected the current limit returns to its normal level. This prevents “soft short” power dissipation situations.
The controlled current ramp function can be used to limit the slew rate of the current during turn on and turn off.
The controller is designed for use in rugged environments. It operates over a -55°C to 125°C temperature range. It is radiation tolerant to 100krad TID and 50krad ELDRs as well as SEU to 85Mev-cm2/mg. It has ESD protection of 2kV HBM.
Features
- Internal 5A rated power switch
- Switches voltages to 120VDC
- Internal catch diode
- Latching, fold back or remote configurable
- Accurate current share when paralleled
- Soft over load avoidance
- Optional hiccup restart mode
- Programmable current levels
- Programmable timer
- Current monitor output
- Separate on off logic inputs
- Low switch voltage drop
- Option for over temp shutdown
- Option for current slew rate control
- Small hermetic 48 lead HTF package
- Rad Tolerant: 100krad TID, 50kad ELDRS
Applications
- Power control and distribution
- Latch-able current limiter to 5A
- Fold back Current limiter to 5A
- Can be paralleled for even higher currents
Please direct LX7712 technical inquiries to AMSTech@microsemi.com
Resources
Datasheets | |
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LX7712 Datasheet | |
Reliability | |
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Quality & Reliability Report - Aliso Viejo, CA, USA - Garden Grove, CA, USA - San Jose, CA, USA |
Radiation TID reports | |
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AAHS298B ELDRS May 2013 | |
AAHS298B TID Report 2013 |
Radiation SEE Reports | |
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AAHS298B SEE Report D-00 |
Certifications | |
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ISO 9001:2008 Certificate - Aliso Viejo, CA, USA - Garden Grove, CA, USA - San Jose, CA - USA |