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PA83A Datasheet(PDF) 4 Page - Cirrus Logic |
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PA83A Datasheet(HTML) 4 Page - Cirrus Logic |
4 / 5 page P r o d u c t I n n o v a t i o n F r o m PA83 • PA83A 4 PA83U GENERAL Please readApplication Note 1 "General Operating Consider- ations" which covers stability, supplies, heat sinking, mounting, current limit, SOA interpretation, and specification interpretation. Visit www.Cirrus.com for design tools that help automate tasks such as calculations for stability, internal power dissipation, current limit and heat sink selection. The "Application Notes" and "Technical Seminar" sections contain a wealth of informa- tion on specific types of applications. Package outlines, heat sinks, mounting hardware and other accessories are located in the "Packages and Accessories" section. Evaluation Kits are available for most Apex Precision Power product models, consult the "Evaluation Kit" section for details. For the most current version of allApex Precision Power product data sheets, visit www.Cirrus.com. SAFE OPERATING AREA (SOA) The bipolar output stage of this high voltage amplifier has two distinct limitations. 1. The internal current limit, which limits maximum available output current. 2. The second breakdown effect, which occurs whenever the simultaneous collector current and collector-emitter voltage exceed specified limits. The SOA curves combine the effect of these limits. For a given application, the direction and magnitude of the output current should be calculated or measured and checked against the SOA curves. This is simple for resistive loads but more complex for reactive and EMF generating loads. However, the following guidelines may save extensive analytical efforts: +VS –VS FIGURE 1. PROTECTION, INDUCTIVE LOAD 100 300 200 20 30 40 50 100 200 150 250 150 120 80 70 INTERNAL VOLTAGE DROP, SUPPLY TO OUTPUT (V) INTERNAL CURRENT LIMIT SOA 1. The following capacitive and inductive loads are safe: ±V S C(MAX) L(MAX) 150V .7 F 1.5H 125V 2.0µF 2.5H 100V 5.µF 6.0H 75V 60µF 30H 50V ALL ALL 2. Short circuits to ground are safe with dual supplies up to 120V or single supplies up to 120V. 3. Short circuits to the supply rails are safe with total supply voltages up to 120V, e.g. ±60V. 4. The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery diodes should be used. INDUCTIVE LOADS Two external diodes as shown in Figure 1, are required to protect these amplifiers against flyback (kickback) pulses exceeding the supply voltages of the amplifier when driving inductive loads. For component selection, these external diodes must be very quick, such as ultra fast recovery diodes with no more than 200 nanoseconds of reverse recovery time. Be sure the diode voltage rating is greater than the total of both supplies. The diode will turn on to divert the flyback energy into the supply rails thus protecting the output transistors from destruction due to reverse bias. A note of caution about the supply.The energy of the flyback pulse must be absorbed by the power supply.As a result, a tran- sient will be superimposed on the supply voltage, the magnitude of the transient being a function of its transient impedance and current sinking capability. If the supply voltage plus transient exceeds the maximum supply rating or if the AC impedance of the supply is unknown, it is best to clamp the output and the supply with a zener diode to absorb the transient. |
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