AS1720A-ATDT

AS1720A-ATDT Datasheet

AS1720

Part	Datasheet
AS1720A-ATDT	AS1720A-ATDT (pdf)

Related Parts	Information
AS1720B-ATDT	AS1720B-ATDT

PDF Datasheet Preview
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. 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. Table Standard Products Model Operation Mode AS1720A DC Current Source Operation AS1720B PWM Switching Operation 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. Both devices are optimized for driving electromechanical devices such as valves, solenoids relays, actuators and positioners. 2 Key Features Supply Range +5V to +50V Internal VDDA 3.3V Supply Current 1 mA 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 Limitation Thermal shutdown 150ºC 8-pin MLPD 2x2mm Package 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. Figure AS1720 - Block Diagram Vsupply +5V to +50V 100nF 1 VDDHV 2 VDDA R1 adjustable Duty cycle 3 DUTY Vref LDO & Ref Generator Internal VDDA typ. 3.3V AS1720 30kHz Oscillator Delay PWM & Control VDDA RPU Thermal Shutdown Current Adjust ENN 8 Energising Current adjust Hold Current adjust Free- Wheeling Datasheet - Ordering Information 11 Ordering Information The device is available as the standard products shown in Table Table Ordering Information Ordering Code AS1720A-ATDT AS1720B-ATDT Marking A0 AW Solenoid / Valve Driver with Current Limitation and with DC Current Source Operation Solenoid / Valve Driver with Current Limitation and with PWM Switching Operation Delivery Form Tape and Reel Tape and Reel Package 8-pin MLPD 2x2mm 8-pin MLPD 2x2mm Note All products are RoHS compliant and austriamicrosystems green. Buy our products or get free samples online at ICdirect: Technical Support is found at For further information and requests, please contact us or find your local distributor at 11 - 12 AS1720 Datasheet Copyrights Copyright 1997-2011, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. Disclaimer Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services. Contact Information Headquarters austriamicrosystems AG Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel +43 0 3136 500 0 Fax +43 0 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: 12 - 12

PDF Datasheet Preview

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.

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.

Table Standard Products

Model

Operation Mode

AS1720A

DC Current Source Operation

AS1720B

PWM Switching Operation

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.

Both devices are optimized for driving electromechanical devices such as valves, solenoids relays, actuators and positioners.
2 Key Features

Supply Range +5V to +50V Internal VDDA 3.3V Supply Current 1 mA 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 Limitation Thermal shutdown 150ºC 8-pin MLPD 2x2mm Package 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.

Figure AS1720 - Block Diagram

Vsupply +5V to +50V
100nF
1 VDDHV
2 VDDA

R1 adjustable Duty cycle
3 DUTY

Vref

LDO & Ref Generator

Internal VDDA typ. 3.3V

AS1720
30kHz Oscillator

Delay

PWM & Control

VDDA RPU

Thermal Shutdown

Current Adjust

ENN 8

Energising Current adjust

Hold Current adjust

Free-

Wheeling
Datasheet - Ordering Information
11 Ordering Information

The device is available as the standard products shown in Table
Table Ordering Information
Ordering Code AS1720A-ATDT AS1720B-ATDT

Marking A0 AW

Solenoid / Valve Driver with Current Limitation and with DC Current Source Operation

Solenoid / Valve Driver with Current Limitation and with PWM Switching Operation

Delivery Form Tape and Reel Tape and Reel

Package 8-pin MLPD 2x2mm 8-pin MLPD 2x2mm

Note All products are RoHS compliant and austriamicrosystems green. Buy our products or get free samples online at ICdirect:

Technical Support is found at

For further information and requests, please contact us or find your local distributor at
11 - 12

AS1720

Datasheet

Copyrights

Copyright 1997-2011, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies.

Disclaimer

Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services.

Contact Information

Headquarters austriamicrosystems AG Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel +43 0 3136 500 0 Fax +43 0 3136 525 01

For Sales Offices, Distributors and Representatives, please visit:
12 - 12

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Datasheet ID: AS1720A-ATDT 519656