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PA69 Datasheet(PDF) 5 Page - Cirrus Logic |
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PA69 Datasheet(HTML) 5 Page - Cirrus Logic |
5 / 5 page APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690–8600 • FAX (520) 888–3329 • ORDERS (520) 690–8601 • EMAIL prodlit@apexmicrotech.com 5 POWER SUPPLY BYPASSING Bypass capacitors to power supply terminals +Vs and –Vs must be connected physically close to the pins to prevent local parasitic oscillation in the output stage of the PA69. Use high quality ceramic capacitors (X7R) 0.1μF or greater. SUPPLY CURRENT The PA69 features a class A/B driver stage to drive the output MOSFETs and an innovative input stage to achieve very high slew rates. The supply current drawn by the PA69, even with no load, varies with the slew rate of the output signal. STABILITY The PA69 is externally compensated and performance can be tailored to the application. Use the graphs of small signal response and power response as a guide. Due to the innovative design of the PA69, two compensation networks are required. The values of these components should be the same to pro- vide symmetric slew rate characteristics. The compensation capacitor Cc must be rated at 500V working voltage. NPO capacitors are recommended. The compensation networks CcRc must be mounted closely to the amplifier pins 8 & 11 and 3 & 10 to avoid spurious oscillation. The PA69 may require an external 33 pF capacitor (mini- mum breakdown of 350V) between Cc– and –Vs to prevent oscillations in the falling edge of the output. This capacitor is provided with the evaluation kit. Please refer to EK60U datasheet for details. ELECTROSTATIC DISCHARGE Like many high performance MOSFET amplifiers, the PA69 very sensitive to damage due to electrostatic discharge (ESD). Failure to follow proper ESD handling procedures could have results ranging from reduced operating performance to cata- strophic damage. Minimum proper handling includes the use of grounded wrist or shoe straps, grounded work surfaces. Ionizers directed at the work in progress can neutralize the charge build up in the work environment and are strongly recommended. GENERAL Please read Application Note 1 “General Operating Consid- erations” which covers stability, power supplies, heat sinking, mounting, current limit, SOA interpretation, and specification interpretation. Visit www.apexmicrotech.com for design tools that help automate tasks such as calculations for stability, internal power dissipation, current limit, heat sink selection, Apex’s complete Application Notes library, Technical Seminar Workbook and Evaluation Kits. SPECIAL CONSIDERATIONS It is very important to realize that in order to achieve high frequency performance the heat sink tab has to be tied to a stable, low impedance reference, i.e. power sup- ply or GND. An AC connection through a 0.1µF capacitor is also sufficient. Internal to the PA69, the heatsink tab is electrically isolated to more than 350V . This may help allay some electrical isolation concerns in tying the heat sink to Vs or GND. CURRENT LIMIT For proper operation, the current limit resistor, R LIM, must be connected as shown in the external connections diagram. For maximum reliability and protection, the resistor should be set as high as possible. The maximum practical value using the following formula is 12 ohms. For even lower current limit values, please see the CURRENT LIMIT vs. RESISTOR graph on the TYPICAL PERFORMANCE GRAPHS page. R LIM = 0.7 / ILIM OPERATING CONSIDERATIONS 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. PA69U REV A1 JULY 2007 © 2007 Apex Microtechnology Corp. PA69 |
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Similar Description - PA69_07 |
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