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MD0107 の電気的特性と機能

MD0107のメーカーはSupertexです、この部品の機能は「Auto Damping Device」です。


製品の詳細 ( Datasheet PDF )

部品番号 MD0107
部品説明 Auto Damping Device
メーカ Supertex
ロゴ Supertex ロゴ 




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MD0107 Datasheet, MD0107 PDF,ピン配置, 機能
Supertex inc.
MD0107
Quad High Voltage, Auto Damping Device
Features
Up to ±130V input voltage protection
35Ω typical ON resistance
Fast switching speed
No external supplies needed
Applications
Medical ultrasound imaging
NDT applications
Fast resettable fuses
High side switches
Data acquisition
Block Diagram
VPP
General Description
The MD0107 can be considered as a normally closed switch
with a typical switch resistance of 35Ω. In this state, the
MD0107 ensures that any leakage currents are shunted to
ground, while maintaining a low voltage drop. This low voltage
level is beneficial as it ensures that the anti-parallel diodes
in the transmit path remain off during the receive cycle of the
system. Thus the anti-parallel diodes more effectively block the
small signals and prevent transmitter noise from contaminating
the receive signal.
 
During operation of the pulser, the MD0107 switch opens and
thus presents a high impedance to the transmitter pulse. The
switch opens as soon as the voltage across it exceeds +/-2V and
can withstand up to +/-130V. In this off-state, the MD0107 has
very little effect on the transmit pulses or the power dissipated
by the pulser.
 
The impedance of the MD0107, when the voltage across it is
low, is suitable for terminating transmission lines. Where the line
impedance is higher than the nominal 35Ω of the MD0107, a
series resistor can be added; for example terminating a ~75Ω
line can be effectively achieved by adding a 39Ω resistor. Without
correct line termination, reflections can cause higher signal loss
and degrade image quality in ultrasound systems.
+130V
TX
RTZ Pulser
VNN
RX
Receiver
MD0107
Auto Damper
MD0105
T/R Switch
-130V
X
Doc.# DSFP-MD0107
NR012714
Supertex inc.
www.supertex.com
Free Datasheet http://www.datasheet4u.net/

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MD0107 pdf, ピン配列
Block Diagram (one of four)
COM
Switch Control
AB
Typical I-V Characteristics
+IPEAK
IA-B
-130V
IA-B = -70µA
-VOFF
+1.0mA
-VTRIP
+VTRIP
+1.0mA
+VOFF
RSW = 35Ω (typ.)
MD0107
IA-B = +70µA
VA-B +130V
-IPEAK
Functional Description
The Supertex MD0107 can be considered as a normally
closed switch controlled by a switch control (please refer to
the block diagram). The switch control monitors the voltage
drop across terminals A and B. If the voltage difference is
greater than ±2.0V, the T/R switch will start to open. Once
in the open state, there is a small amount of current flowing
through the T/R switch, 70µA, to detect if the high voltage is
still present or not.
The T/R switch will not close until the voltage across termi-
nal A and B drops below ±2.0V. A pair of back-to-back di-
odes from the receive side of the switch to ground is needed
to complete the circuit and to allow the initial peak current
(about 60mA) to flow through the switch so it can drop ±2.0V.
If the diodes are not present, then there is no current path
and the voltage drop across terminal A and B will be less
than ±2.0V, so the switch will remain in the closed position.
The MD0107 does not require a power supply. There are
only two active pins; one connects to the transmitter side,
one connects to the receiver side.
ON Resistance
When the voltage across terminals A and B are below ±2.0V,
the switch is in the receive mode and the RON is typically 35Ω.
Once the voltage across the terminals A and B is greater
than ±2.0V, the switch is in the transmit mode and blocking
the high voltage pulses from passing through to the receiver
and damaging it.
Doc.# DSFP-MD0107
NR012714
Supertex inc.
3 www.supertex.com
Free Datasheet http://www.datasheet4u.net/


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