AS1720 Solenoid / Valve Driver with Current Limitation
Is optimized for driving electro -mechanical devices such as valves, solenoids relays, actuators and positioners.
Description
The AS1720A is a low side current source providing an optimized DC Operation for power saving and ultra low electro magnetic 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.
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 electro -mechanical devices such as valves, solenoids relays, actuators and positioners.
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 energising current: 10mA – 100mA
- Adjustable hold current: 30% - 70% of energising current
- Current Limitation
- Thermal shutdown: 150ºC
- 8-pin MLPD (2x2mm) Package
- On request SOIC 8 Package (reduced temperature range -40°C to +85°C)
Applications
The AS1720 is ideal for fluid and gas flow systems, industrial control, electrical heaters, motor speed control.
Block diagram for AS1720 Solenoid / Valve Driver with Current Limitation
AS1720 Solenoid/Valve Driver Block Diagram