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PA15FL Datasheet(PDF) 4 Page - Cirrus Logic |
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PA15FL Datasheet(HTML) 4 Page - Cirrus Logic |
4 / 5 page PA15FL • PA15FLA 4 PA15FLU P r o d u c t I n n o v a t i o n F r o m ® 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. 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. INPUT PROTECTION Although the PA15FL can withstand differential input voltages up to ±25V, additional external protection is recommended. In most applications 1N4148 or 1N914 signal diodes are sufficient (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 required (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 reversals 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 PA15FL 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 PA15FL is externally compensated and performance can be tailored to the application. Use the graphs of small signal response and power response as a guide. The compensation capacitor C C must be rated at 500V working voltage. An NPO capacitor is recommended. The compensation network C CRC must be mounted closely to the amplifier pins 8 and 9 to avoid spurious oscillation. FIGURE 2. OVERVOLTAGE PROTECTION PA15FL +VS –IN +IN Z1 Z2 D4 D3 6 5 1 2 +VS Z1 Z2 6 5 PA15FL a. b. –VS –VS D2 D1 –IN +IN 1 2 Q1 Q2 Q3 Q4 SOA 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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Similar Description - PA15FL_10 |
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