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PA03 Datasheet(PDF) 4 Page - Cirrus Logic |
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PA03 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 PA03 • PA03A 4 PA02U GENERAL Please read Application Note 1 "General Operating Con- siderations" 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; heat sink selection; Apex Precision Power’s completeApplication Notes library;Technical Seminar Workbook; and Evaluation Kits. MOUNTINGPRECAUTIONS The PA03 copper base is very soft and easily bent. Do not put any stress on the mounting ears of this package.This calls for caution when pushing the amplifier into certain types of packaging foam and particularly when inserting the device into a socket. Insert the amplifier into the socket only by pushing on the perimeter of the package lid. Pushing the unit into the socket by applying pressure to the mounting tabs will bend the base due to the high insertion force required. The base will then not contact the heatsink evenly resulting in very poor heat transfer. To remove a unit from a socket, pry the socket away from the heatsink so that the heatsink will support the amplifier base evenly. Recommended mounting torque is 8–10 in.-lbs. (.9–1.13 N•m). SAFEOPERATINGAREA(SOA) Due to the internal (non-adjustable) current limit of the PA03, worst case power dissipation calculations must assume cur- rent capability of 46 amps. Application specific circuits should be checked against the SOA curve when relying upon current limit for fault protection. SAFEOPERATINGAREACURVES Second breakdown limitations do apply to the PA03 but are less severe, since junction temperature limiting responds within 10ms. Stress levels shown as being safe for more than 10ms duration will merely cause thermal shutdown. Under normal operating conditions, activation of the thermal shutdown is a sign that the internal junction temperatures have reached approximately 175°C. Thermal shutdown is a short term safety feature.If the conditions remain that cause thermal shutdown, the amplifier will oscillate in and out of shutdown, creating peak high power stresses, destroying useful signals, and reducing the reliability of the device. BALANCECONTROL The voltage offset of the PA03 may be externally adjusted to zero. To implement this adjustment install a 100 to 200 ohm potentiometer between pins 11 and 12 and connect the wiper arm to the positive supply. Bypass pins 11 and 12 each with at least a .01µF ceramic capacitor. If the optional adjust provision is not used, connect both pins 11 and 12 to the positive supply. OUTPUTSTAGESHUTDOWN The entire power stage of the PA03 may be disabled us- ing one of the circuits shown in Figure 1. There are many applications for this function. One is a load protection based on power delivered to the load or thermal rise. Another one is conservation of power when using batteries. The control volt- age requirements accommodate a wide variety logic drivers. 1. CMOS operating at +5V can drive the control pins di- rectly. 2. CMOS operating at greater than 5V supplies need a voltage divider. 3. TTL logic needs a pull up resistor to +5V to provide a swing to the fully disabled voltage (3.5V). When not using the shutdown feature, connect both pins 3 and 4 to common. PHASECOMPENSATION At low gain settings an external compensation capacitor is required to insure stability. In addition to the resistive feed- back network, roll off or integrating capacitors must also be considered. A frequency of 1 MHz is most appropriate to cal- culate gain. Operation at gains below 10, without the external compensation capacitor opens the possibility of oscillations near output saturation regions when under load, the improper operation of the thermal shutdown circuit. This can result in amplifier destruction. At gains of 10 or more: 1. No external components are required. 2. Typical slew rate will be 8V/µs. 3. Typical phase margin will be 70°. 1 10 20 50 100 150 5 10 30 40 SUPPLY TO OUTPUT DIFFERENTIAL VS –VO (V) CURRENT LIMIT ZONE 1.0mS 10mS 100mS THERMAL TC = 25°C dc SOA EXTERNALCONNECTIONS 1 2 3 4 5 6 12 11 10 9 8 7 TOP VIEW BALANCE CONTROL BALANCE CONTROL PHASE COMP. PHASE COMP. +SUPPLY +OUTPUT –INPUT +INPUT –SHUT DN +SHUT DN –SUPPLY –OUTPUT Pins 6 & 7 must be connected together. If unused, tie Pins 11 & 12 to +SUPPLY. † † IMPORTANT: OBSERVE MOUNTING PRECAUTIONS. REVERSE INSERTION WILL DESTROY UNIT. The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or subject to temperatures in excess of 850°C to avoid generating toxic fumes. CAUTION |
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