Electronic Device And Electronic Circuit

Data of electronic device , PCB Design and electronic circuit

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Saturday, June 21, 2008

Bidirectional Current Sensor

Bidirectional Hall Effect Based Linear Current Sensor with
Voltage Isolation and 20 A Dynamic Range

The Allegro ACS706 family of current sensors provides economical
And precise solutions for current sensing in industrial, automotive,
commercial, and communications systems. The device package allows
for easy implementation by the customer. Typical applications include
motor control, load detection and management, switched-mode power
supplies, and overcurrent fault protection.
Current Input Range Min -20 A Max 20 A
Output Voltage versus Current Input (Vcc = 5V)

• Small footprint, low-profile SOIC8 package
• 1.5 mΩ internal conductor resistance
• Excellent replacement for sense resistors
• 1600 VRMS minimum isolation voltage between pins 1-4 and 5-8
• 4.5 to 5.5 V, single supply operation
• 50 kHz bandwidth
100 mV/A output sensitivity and 20 A dynamic range
• Output voltage proportional to ac and dc currents
• Factory-trimmed for accuracy
• Extremely stable output offset voltage
• Near-zero magnetic hysteresis
• Ratiometric output from supply voltage

ACS706ELC-20A Datasheet pdf


Tuesday, June 17, 2008

Overcurrent Protection Circuit

Overcurrent Protection Circuit for High Side Relay Diver

The LTC1154 single high side gate driver allows using low
cost N-channel FETs for high side switching applications. An
internal charge pump boosts the gate drive voltage above
the positive rail, fully enhancing an N-channel MOS switch
with no external components. Micropower operation, with
8μA standby current and 85μA operating current, allows
use in virtually all systems with maximum effi ciency.
Included on chip is programmable overcurrent sensing.

A time delay can be added to prevent false triggering on
high inrush current loads.

- Fully Enhances N-Channel Power MOSFETs
- 8μA IQ Standby Current
- 85μA IQ ON Current
- No External Charge Pump Capacitors
- 4.5V to 18V Supply Range
- Short-Circuit Protection
- Thermal Shutdown via PTC Thermistor
- Status Output Indicates Shutdown
- Available in 8-Pin SOIC and PDIP Packages

LTC1154 datasheet pdf

Sunday, June 08, 2008

Protected 2A Switch circuit

Protected 2A Switch with Isolated Inputs , Fault Output circuit

The LT1161 is a quad high-side gate driver allowing the
use of low cost N-channel power MOSFETs for high-side
switching applications. It has four independent switch
channels, each containing a completely self-contained
charge pump to fully enhance an N-channel MOSFET
switch with no external components.


- Fully Enhances N-Channel MOSFET Switches
- 8V to 48V Power Supply Range
- Protected from –15V to 60V Supply Transients
- Individual Short-Circuit Protection
- Individual Automatic Restart Timers
- Programmable Current Limit, Delay Time, and
Auto-Restart Period
- Voltage-Limited Gate Drive
- Defaults to OFF State with Open Input
- Flowthrough Input to Output Pinout
- Available in 20-Lead DIP or SOL Package

LT1161 datasheet pdf