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PA15 Datasheet(PDF) 4 Page - Cirrus Logic |
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PA15 Datasheet(HTML) 4 Page - Cirrus Logic |
4 / 4 page This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice. PA15U REV. D MARCH 1999 © 1999 Apex Microtechnology Corp. OPERATING CONSIDERATIONS PA15 • PA15A GENERAL Please read Application Note 1 “General Operating Consid- erations”, which covers stability, supplies, heatsinking, mount- ing, current limit, SOA interpretation, and specification inter- pretation. Additional information can be found in other applica- tion notes. For information on the package outline, heatsinks, and mounting hardware, consult the “Accessory and Package Mechanical Data” section of the data book. CURRENT LIMIT For proper operation, the current limit resistor (R CL) must be connected as shown in the external connection diagram. The minimum value is 2 ohm, however for optimum reliability the resistor value should be set as high as possible. The value is calculated as follows; with the maximum practical value of 150 ohms. .6 R CL = I LIM SAFE OPERATING AREA (SOA) The MOSFET output stage of this power operational ampli- fier has two distinct limitations: 1. The current handling capability of the MOSFET geometry and the wire bonds. 2. The junction temperature of the output MOSFETs. NOTE: The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery diodes should be used. Pulsed output currents may not reach 350 mA with V S – VO less than 25V. INPUT PROTECTION Although the PA15 can withstand differential input voltages up to ±25V, additional external protection is recommended. In most applications 1N4148 or 1N914 signal diodes are suffi- cient (D1-D4 in Figure 2a). In more demanding applications where low leakage or low capacitance are of concern 2N4416 or 2N5457-2N5459 JFETs connected as diodes will be re- quired (Q1-Q4 in Figure 2b). In either case the input differential voltage will be clamped to ±1.4V. This is sufficient overdrive to produce maximum power bandwidth. POWER SUPPLY PROTECTION Unidirectional zener diode transient suppressors are recom- mended as protection on the supply pins. The zeners clamp transients to voltages within the power supply rating and also clamp power supply reversals to ground. Whether the zeners are used or not, the system power supply should be evaluated for transient performance including power-on overshoot and power-off polarity reversals as well as line regulation. Conditions which can cause open circuits or polarity rever- sals on either power supply rail should be avoided or protected against. Reversals or opens on the negative supply rail are known to induce input stage failure. Unidirectional transzorbs prevent this, and it is desirable that they be both electrically and physically as close to the amplifier as possible. STABILITY The PA15 has sufficient phase margin to be stable with most capacitive loads at a gain of 10 or more, using the recom- mended phase compensation. The PA15 is externally compensated and performance can be tailored to the ap- plication. Use the graphs of small sig- nal response and power response as a guide. The compen- sation capacitor C C must be rated at 500V working volt- age. An NPO capaci- tor is recommended. The compensation network C CRC must be mounted closely to the amplifier pins 8 and 9 to avoid spu- rious oscillation. FIGURE 2. OVERVOLTAGE PROTECTION PA15 +V S –IN +IN Z1 Z2 D4 D3 6 5 1 2 +V S Z1 Z2 6 5 PA15 a. b. –V S –V S D2 D1 –IN +IN 1 2 Q1 Q2 Q3 Q4 SUPPLY TO OUTPUT DIFFERENTIAL, V S –VO (V) 25 50 75 100 250 500 10 20 30 50 100 200 300 500 DC, T C = 125°C DC, T C = 85°C 200mS PULSE CURVES @ 10% DUTY CYCLE MAX DC, T C = 25°C 100mS 125 |
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