PA93/27 Просмотр технического описания (PDF) - Cirrus Logic
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PA93/27 Datasheet PDF : 6 Pages
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Product Innova tionFrom
PA93/27
PHASE COMPENSATION
GAIN
CC*
RC
≥1 220pF 100Ω
≥2 100pF 100Ω
≥4
47pF 0Ω
≥17 10pF 0Ω
*CC Never to be <10pF. CC to be rated for the full supply voltage +VS to -VS. Use ceramic NPO (COG) type.
GENERAL
Please read Application Note 1 "General Operating Considerations" 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 selec-
tion; Apex’s complete Application Notes library; Technical Seminar Workbook; and Evaluation Kits.
CURRENT LIMIT
For proper operation, the current limit resistor (RCL) must be connected as shown in the external connection dia-
gram. 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 16 ohms.
RCL = .IL6 IM5
SAFE OPERATING AREA (SOA)
20
The MOSFET output stage of this power operational am-
SOA
DC, TC = 25C
plifier has two distinct limitations:
10
1. The current handling capability of the MOSFET ge-
8
ometry and the wire bonds.
6
2. The junction temperature of the output MOSFETs.
4
NOTE: The output stage is protected against transient
3
flyback. However, for protection against sustained, high
2
energy flyback, external fast-recovery diodes should be
used.
1
.8
SAFE OPERATING CURVES
The safe operating area curves define the maximum ad-
.6
.4
.3
ditional internal power dissipation the amplifier can toler-
ate when it produces the necessary output to drive an
.2
200mS
100mS
DC,T
DC,T
C = 85C
C = 125C
external load.
INPUT PROTECTION
Although the PA93/27 can withstand differential voltages
.1
.08
.06
10
20 30 40 60 80 100
200 300 500
up to ±20V, additional external protection is recommend-
SUPPLY TO OUTPUT DIFFERENTIAL, VS – VO (V)
ed. Low leakage, low capacitance JFETs connected as
diodes are recommended (e.g. 2N4416, Q1-Q4 in Figure 2). The differential input voltage will be clamped to ±1.4V.
This is sufficient overdrive to produce maximum power bandwidth.
PA93/27U
5
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