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PA19A Datasheet(PDF) 4 Page - Cirrus Logic |
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PA19A Datasheet(HTML) 4 Page - Cirrus Logic |
4 / 5 page APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739 4 OPERATING CONSIDERATIONS PA19 • PA19A simple for resistive loads but more complex for reactive and EMF generating loads. The following guidelines may save extensive analytical efforts: 1. Capacitive and inductive loads up to the following maximums are safe: ±V S CAPACITIVE LOAD INDUCTIVE LOAD 40V .1µF 11mH 30V 500µF 24mH 20V 2500µF 75mH 15V ∞ 100mH 2. Safe short circuit combinations of voltage and current are limited to a power level of 100W. 3. The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery diodes should be used. SUPPLY CURRENT The PA19 features a class A/B driver stage to charge and discharge gate capacitance of Q7 and Q19. As these currents approach 0.5A, the savings of quiescent current over that of a class A driver stage is considerable. However, supply current drawn by the PA19, even with no load, varies with slew rate of the output signal as shown below. OUTPUT LEADS Keep the output leads as short as possible. In the video frequency range, even a few inches of wire have significant inductances, raising the interconnection impedance and limit- ing the output current slew rate. Furthermore, the skin effect increases the resistance of heavy wires at high frequencies. Multistrand Litz Wire is recommended to carry large video currents with low losses. THERMAL SHUTDOWN The thermal protection circuit shuts off the amplifier when the substrate temperature exceeds approximately 150°C. This allows the heatsink selection to be based on normal operating conditions while protecting the amplifier against excessive junction temperature during temporary fault conditions. Thermal protection is a fairly slow-acting circuit and therefore does not protect the amplifier against transient SOA violations (areas outside of the steady state boundary). It is designed to 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 complete Application Notes library; Technical Seminar Workbook; and Evaluation Kits. CURRENT LIMIT Q2 (and Q25) limit output current by turning on and remov- ing gate drive when voltage on pin 2 (pin 7) exceeds .65V dif- ferential from the positive (negative) supply rail. With internal resistors equal to 1.2Ω, current limits are approximately 0.5A with no external current limit resistors. With the addition of external resistors current limit will be: .65V I LIM = +.54A R CL To determine values of external current limit resistors: .65V R CL = I CL - .54A PHASE COMPENSATION At low gain settings, an external compensation capacitor is required to insure stability. In addition to the resistive feedback network, roll off or integrating capacitors must also be consid- ered when determining gain settings. The capacitance values listed in the external connection diagram, along with good high frequency layout practice, will insure stability. Interpolate values for intermediate gain settings. 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. The SOA curves combine the effect of these limits and allow for internal thermal delays. For a given application, the direc- tion and magnitude of the output current should be calculated or measured and checked against the SOA curves. This is ��� ��� ��� ��� ��� ��� ��� �� �� �� �� �� �� �� �� �� �� ���������������������������������������� ���������� ������������ ��������� ��������� � �������� ��� �������������� ��� ��� ��� ��� � ��� ���� ���� �� �� ��� ����������������� � ����������������� � �������� |
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