LX1802 Datasheet, PDF (1/4 Pages) Microsemi Corporation – PLUG for MED427A-1

LX1802
CARLSBAD DIVISION
"PLUG" for MED427A-1
TARGET DATASHEET
DESCRIPTION
The MSC-LX1802 is the IC2 "Plug" for the MED427A-1 module. The "Plug"
chip has peak rectifier, level shifter, and switch. This full wave peak rectifier
converts the peak to peak AC input waveform to a DC level. The charge builds
up on both terminals of the storage capacitor to step up the DC level during a full
wave input signal. The charge dissipates via a resistor when the AC input signal
stops. The level shifter is a source follower transistor with a resistive load. The
input connects to the peak rectifier output and the output connects to IGBT_G. If
the input voltage is below threshold, the output (IGBT_G) equals IGBT_E
voltage. If the input voltage exceeds the threshold voltage of the transistor, the
output steps up to the bootstrap voltage Vhi+IGBT_E at the IGBT_G output. The
switch supplements the discharge of the capacitor in the peak rectifier when the
AC input signal stops. The switch remains open when there is an AC signal since
a virtual ground forms at its input and prevents a channel from forming in the
active device. The opposite occurs when the AC signal stops and the input builds
a potential greater than a threshold voltage.
KEY FEATURES
• Low peak current
consumption: <2mA
• Small form factor 0.889 mm²
• Solder bumped die
APPLICATIONS
• Implantable Cardio Defib
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
BLOCK DIAGRAM
Vhi
Level
Clamp
IGBT_G
in
Peak
Shifter
Switch
Rect
IGBT_E
Simplified Block Diagram
Copyright  2001
Rev. 0.2b, 2002-06-17
PACKAGE ORDER INFO
T_J (°C)
10 to 55
Package Number
LX1802
Microsemi
Carlsbad Division
5973 Aveniva Encinas, Suite 101, Carlsbad 92008, Fax [phone]