Datasheet > AS1720

AS1720

更新时间： 2022-10-11 11:51:03

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艾迈斯 - AMSCO		/
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Solenoid / Valve Dr iver wi th Cur rent Limi tat ion

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AS1720 数据手册

Datasheet

AS1720

Solenoid / Valve Driver with Current Limitation

1 General Description

The AS1720A is a low side current source providing an optimized

DC Operation for power saving and ultra low electromagnetic

radiation.

2 Key Features

ꢀ

Supply Range: +5V to +50V

Internal VDDA: 3.3V

Supply Current: 1 mA

The AS1720B is a low side switch providing a PWM output, which

frequency is defined by an internal RC oscillator. The adjustable

PWM allows a fine control of the power delivered to the load.

Internal osc frequency: 30kHz

Fix delay: 136ms

Adjustable duty cycle: 20% – 90% (AS1720B only)

Adjustable energizing current: 10mA – 100mA

Adjustable hold current: 30% ꢀ 70% of energizing current

Current Limitation

Table 1. Standard Products

Model

Operation Mode

AS1720A

AS1720B

DC Current Source Operation

PWM Switching Operation

Thermal shutdown: 150ºC

8ꢀpin MLPD (2x2mm) Package

The AS1720A and AS1720B can be set to provide a strong initial

closure current and is automatically switching to hold mode for

power saving. The initial DC current, the hold current and the duty

cycle of the PWM can be adjusted by external resistors. An internal

thermal sensor prevents damage of the circuit due to excessive

heating up.

On request SOIC 8 Package (reduced temperature range ꢀ40°C

to +85°C)

3 Applications

The AS1720 is ideal for fluid and gas flow systems, industrial control,

electrical heaters, motor speed control.

Both devices are optimized for driving electromechanical devices

such as valves, solenoids relays, actuators and positioners.

Figure 1. AS1720 - Block Diagram

Vsupply: +5V to +50V

Internal VDDA typ. 3.3V

LDO &

Ref Generator

VDDHV

100nF

AS1720

VDDA

30kHz

Oscillator

Delay

Free-

Wheeling

Diode

Thermal

Shutdown

adjustable

Duty cycle

PWM &

Control

OUT

DUTY

10nF

Current

Adjust

ref

VDDA

VSS

ENN

Off

RIE

RIH

Hold Current adjust

Energising Current adjust

www.austriamicrosystems.com/SolenoidꢀRelayꢀDriver/AS1720

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