AS1720 AMSCO
Document overview
- Manufacturer or author: Provided By digicamel.com
- PDF pages: 12
Technical content
1 General Description
PWM allows a fine control of the power delivered to the load. such as valves, solenoids relays, actuators and positioners.
2 Key Features
3 Applications
electrical heaters, motor speed control. Figure 1. AS1720 - Block Diagram
4 Pin Assignments
Figure 2. Pin Out (T op View) pin to VDDA the 50% duty cycle is selected automatically. IE 6 Energize Current. This pin defines the current during energize phase by means of a resistor. IH 7 Hold Current. This pin defines the current during hold phase by means of a resistor. AS1720 is always powered on. When the device is constantly powered on, it can be controlled by this pin. High: The output current source is switched off. Low: The device starts with the energise phase, followed by the hold phase.
8 ENN
5 VSS
www.austriamicrosystems.com/SolenoidjRelayjDriver/AS1720 Revision 1.04 3 j 12 AS1720 Datasheet j Absolute Maximum Ratings
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 3 may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in Section 6 Electrical Characteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. T able 3. Absolute Maximum Ratings Parameter Min Max Units Notes Electrical Parameters VDDHV, OUT j0.9 +55 V VDDA, DUTY, ENN, IE, IH j0.3 +5 V Input Current (latchjup immunity) j100 100 mA Norm: JE DEC 78 @85°C Electrostatic Discharge Electrostatic Discharge HBM +/j 1.5 kV Norm: MIL 883 E method 3015 Temperature Ranges and Storage Conditions Thermal Resistance θJA +36 ºC/W Junction Temperature T J +140 ºC Internally limited Storage Temperature Range j55 +150 ºC Package Body Temperature +260 ºC The reflow peak soldering temperature (body temperature) specified is in accordance with IPC/ JEDEC J-STD-020 “Moisture/Reflow Sensitivity Classification for Non-Hermetic Solid State Surface Mount Devices”. The lead finish for Pbjfree leaded packages is matte tin (100% Sn). Humidity 5 85 % Nonjcondensing Moisture Sensitive Level 1 Represents a max. floor li fe time of unlimited
www.austriamicrosystems.com/SolenoidjRelayjDriver/AS1720 Revision 1.04 4 j 12 AS1720 Datasheet j Electrical Characteristics
6 Electrical Characteristics
VDDHV = 5V, VSS = 0V, Typical Values are at TAMB = +25ºC (unless otherwise specified). All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality Control) methods. T able 4. Electrical Characteristics Symbol Parameter Conditions Min Typ Max Units TAMB Operating Ambient Temperature j40 +85 °C TJ Operating Junction Temperature j40 +125 °C valid for AS1720A & AS1720B VDDHV Supply Voltage Range 5 50 V VDDA Internal Supply no load 3.1 3.3 3.5 V IDD Supply Current 1 2 mA IOUT_E Output Energizing Current Range 1. The parameters are tested with proprietary test modes. defined by R IE (see Figure 10 on page 7) 10 100 mA VIH Digital Input Threshold @ pin ENN
2 V DDA
V VIL VSS 1.2 VHYST Hysteresis @ pin ENN 200 mV RPU PulljUp Resistor @ pin ENN 100 k Ω Delay Time See Delay on page 6 136 ms TSHDN Thermal Shutdown Temperature 160 ºC ΔTSHDN Thermal Shutdown Hysteresis 15 ºC only valid for AS1720A VOUT Saturation Voltage, Sink 1 IOUT = 100mA 0.6 1 V k Transfer Value RIE = 12k Ω , VDDHV = 5V to 50V, OUT = 1V to 40V (see page 7) 1080 1200 1320 A Ω IOUT_H Output Hold Current Range 1 defined by R IH (see Figure 10 on page 7) 0.3 x IOUT_E 0.7 x IOUT_E mA only valid for AS1720B Minimum Duty Cycle 15 20 25 % Maximum Duty Cycle 83 90 95 % Internal Duty Cycle 50 % Vtrig Trigger level to select internal voltage divider @ pin DUTY V DDA V fPWM PWM Frequency 25.5 30 34.5 kHz
7 Typical Operating Characteristics
Figure 3. Duty Cycle vs. V DUTY Figure 4. PWM Frequency vs. Temperature Figure 5. Supply Current vs. Supply Voltage Figure 6. Supply Current vs. Temperature Figure 7. Transfer Function vs. Supply Voltage Fig ure 8. Transfer Function vs. T emperature
8 Detailed Description
The delay time is generated internally by a digital divider. setting the duty cycle will be supplied. condition the system restarts beginning with the energizing phase followed by the hold phase. the DC output current is reduced according to the RIH on pin IH. and switches to the internal divider, which causes a fixed 50% duty cycle. Figure 9. Simplified Circuit of Block PWM and Cont rol
pin VDDHV. This feature is useful when controlling by a microprocessor is desired. Because of the internal pulljup resistor to VDDA a microprocessor with openjdrain or with push/pull (max 3.3V) output can be used. The temperature coefficient depends on the Bandgap voltage (100ppm/K, box method) and external resistor (in the range of several ppm/K). The saturation voltage of the output current source for a 100mA current is typical 600mV. Figure 10. Simplified Circuit of Blocks Current Ad just and Current Source
9 Application Information
This circuit is only applicable for AS1720A. Figure 11. AS1720A - Typical Application
Figure 12. 8-pin MLPD (2x2mm) Marking
Figure 13. 8-pin MLPD (2x2mm) Package
www.austriamicrosystems.com/SolenoidjRelayjDriver/AS1720 Revision 1.04 11 j 12 AS1720 Datasheet j Ordering Information The device is available as the standard products shown in Table 5 . Note: All products are RoHS compliant and austriamicrosystems green. Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect Technical Support is found at http://www.austriamicrosystems.com/TechnicaljSupport For further information and requests, please contact us mailto:sales@austriamicrosystems.com or find your local distributor at http://www.austriamicrosystems.com/distributor T able 5. Ordering Information Ordering Code Marking Description Delivery Form Package AS1720AjATDT A0 Solenoid / Valve Driver with Current Limitation and with DC Current Source Operation Tape and Reel 8jpin MLPD (2x2mm) AS1720BjATDT AW Solenoid / Valve Driver with Current Limitation and with PWM Switching Operation Tape and Reel 8jpin MLPD (2x2mm)
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