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PA96 Datasheet(PDF) 4 Page - Cirrus Logic |
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PA96 Datasheet(HTML) 4 Page - Cirrus Logic |
4 / 4 page APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739 4 OPERATING CONSIDERATIONS PA96 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.apexmicrotech.com for design tools that help automate tasks such as calculations for stability, internal power dissipation, current limit, heat sink selection, Apex’s Application Notes library, Technical Seminar Workbook, and Evaluation Kits. SPECIAL PRECAUTIONS The PA96 operates with up 300V rail to rail voltage, and delivers amperes of current. Precautions should be taken for the safety of the user and the amplifier. Although the non-operating common mode input range is rail to rail, the differential input voltage must not exceed ±15 V. Therefore; if the feedback ratio is less than 10, even if caused by disconnecting a signal source , typical power turn on transients can destroy the amplifier. Similarly in a voltage follower application a large differential transient can be generated if the slew rate of the input is greater than that of the voltage follower. Therefore it is prudent to clamp the input with series back to back diodes as shown below. If experimentally optimizing the compensation capacitor, turn off the supplies and let them bleed to low voltage before installing each new value. Otherwise internal current pulses of up to 3 amps can be induced. Also, do you want your fingers around 300V? Essentially the full rail to rail power supply voltage may be applied to the compensation capacitor. A 400V COG or Mica capacitor is recommended. POWER BANDWIDTH The power bandwidth is 1/(π x the negative edge slew time). The slew time is determined by the compensation capacitor, load, and internal device capacitance; it is independent of closed loop gain. The uncompensated power bandwidth is typically 100kHz for a 250Vp-p output signal into 100Ω. It typi- cally increases to above 300KHz with no load. COMPENSATION TABLE The following table tabulates recommended compensation capacitor values vs. gain. These values will typically result in less than 2% overshoot and a -3db small signal bandwidth of greater than 1MHz, except under operating conditions where uncompensated gain bandwidth is too low to support a 1MHz bandwidth. (See gain bandwidth vs. Plus power supply curves). Note that other factors such as capacitance in parallel with the feedback resistor may reduce circuit bandwidth from that determined from the gain bandwidth curve. Cc Inverting Gain From To 150pf 1 2 51pf 2 5 33pf 5 10 22pf 10 20 10pf 20 50 5pf 50 100 None 100 up Cc Non-Inverting Gain From To 330 pf 1 2 150pf 2 3 51pf 3 6 33pf 6 10 22pf 10 20 10pf 20 50 5pf 50 100 None 100 up CURRENT LIMIT For proper operation the current limit resistor, Rcl, must be connected as shown in the external connections diagram. The minimum value is 0.2Ω, with a maximum practical value of 100Ω. For optimum reliability the resistor should be set as high as possible. The value is calculated as I L = 0.68V/Rcl. Note that the 0.68V is reduced by 2mV every °C rise in temperature. Also note that the current limit can be set such that the SOA is exceeded on a continuous basis. As an example if the current limit was set at 1.5A and the supply was at 150V, a short to ground would produce 225 watts internal dissipation, greatly exceeding the 83 watt steady state SOA rating. Under some conditions of load and compensation the am- plifier may oscillate at a low level when current limit is active, even though the amplifier is stable otherwise. The current will be limited to the programmed value in this situation. To minimize such occurrences, use a non-reactive resistor to program current limit. 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. PA96U REV B DECEMBER 2005 © 2005 Apex Microtechnology Corp. ������ ������ ������ ������ ���� |
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