MD0101 データシートの表示（PDF） - Supertex Inc

部品番号

コンポーネント説明

メーカー

MD0101

High Voltage Protection T/R Switch with Clamp Diodes

Supertex Inc 

Block Diagram

TX

RX

Switch Control

RGND

Typical I-V Characteristics

+IPEAK

ITX - RX

-100V

ITX - RX = -200µA

-VOFF

+1.0mA

-VTRIP

+VTRIP

+1.0mA

+VOFF

RSW = 15Ω

MD0101

ITX - RX = +200µA

VTX - RX

+100V

-IPEAK

Functional Description

The Supertex MD0101 can be considered a normally closed

switch, controlled by a switch control (please refer to the

block diagram). The switch control monitors the voltage

drop across terminals TX and RX. If the voltage difference

is greater than ±1.0V, the T/R switch will start to open. Once

in the open state, there is a small amount of current flow-

ing through the T/R switch, 200µA, to detect if the high volt-

age is still present or not. The T/R switch will not close until

the voltage across terminals TX and RX drops below ±2.0V.

Connecting the RGND to ground will allow the initial peak

current, about 60mA, to flow through the switch then to the

clamp diodes to RGND. The clamp diode I-V Curve is shown

in Figure 8. If external diodes are desired, the RGND pin can

be connected to the corresponding RX pin or left floating.

The external diodes can then be connected to RX to ground.

The MD0101 does not require a power supply. There are

only three pins per channel; one connects to the transmitter

side, one connects to the receiver side, and the other one is

the ground connection for diodes.

On Resistance

When the voltage across terminals TX and RX is below

±1.0V, the switch is in the receive mode, and the RON is typi-

cally 15Ω. Once the voltage across the terminals TX and RX

is greater than ±2.0V, the switch is in the transmit mode and

blocks the high voltage pulses from passing through to the

receiver and damaging it.

Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com

3

Share Link: