Electronic Components Datasheet Search |
|
QPA3202 Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers |
|
QPA3202 Datasheet(HTML) 7 Page - List of Unclassifed Manufacturers |
7 / 8 page QuickPack® QPA3202 PIEZO POWER AMPLIFIER Midé Technology Corporation. www.mide.com Ph +1 781 306 0609 7 Voltage Monitor The QPA3202 offers an auxiliary analog output for feedback control or monitoring the differential output voltage. The monitor output is a replica of the load voltage scaled by a factor of 1/50 (0.02 V/V). This output should be connected only to an oscilloscope or other high‐ impedance monitoring device. Output Current Limit Piezoelectric actuators can be effectively modeled by a simple capacitor. There is significant resistance in series with the capacitor, but this is neglected here. Like any other amplifier, the drive frequency limitation of the QPA3202 is a function of its peak current capability, according to the familiar equation: dt t dv C t i ) ( ) ( Since the current limit of the QPA3202 is 2 Amperes (2A), the maximum output voltage slew rate is 2/C where C is the piezo capacitance. For a pure sinusoid with frequency f (in Hz) and amplitude Vo (zero to peak), the maximum rate or derivative is o V f 2 . Therefore, the maximum drive frequency as a function of output amplitude Vo and load capacitance C can be expressed by: C V f o 1 max The maximum frequency fmax is the frequency at which the output waveform becomes distorted by current‐limiting. Sinusoids, for example, will become linear at zero crossings. Operation is permitted beyond this frequency provided that internal temperature limitations are not exceeded (see following sections). Large capacitive loads may also de‐stabilize the amplifier. Note that this constraint is in addition to the amplifier bandwidth, which is limited to 8kHz. Thermal Overload Protection High internal power dissipation is common to all linear amplifiers that are designed to drive capacitive loads. This dissipation is a function of load capacitance, output voltage amplitude, and drive frequency. In general, increasing any of these variables increases power dissipation. If there are no means to limit this effect, heavy loads will cause excessive temperatures that can overheat and damage the amplifier. For this reason the QPA3202 is equipped with internal temperature monitoring circuitry. When the internal temperature exceeds a predefined threshold, the QPA3202 will enter thermal shutdown mode. In this mode the amplifier is automatically switched off and the OT LED indicator is illuminated. The instrument will remain in this condition until the user recycles the power supply and the temperature has decreased to a safe level. Figure 3 indicates the thermal shutdown boundary as a function of frequency and load capacitance for full‐scale output (200V sinusoid). This curve applies to steady‐state operation only. The QPA3202 is capable of operating beyond this curve provided that the duration of operation (or duty‐cycle) is low enough to prevent over‐heating. |
Similar Part No. - QPA3202 |
|
Similar Description - QPA3202 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |