PA76A Cirrus Logic Inc, PA76A Datasheet - Page 4

• Manufacturer Part Number: PA76A
• Description: IC PWR AMP DUAL 40V 3A 8PIN TO3
• Manufacturer: Cirrus Logic Inc
• Series: Apex Precision Power™r

Specifications of PA76A

• Amplifier Type: Power
• Number Of Circuits: 2
• Slew Rate: 1.4 V/µs
• Gain Bandwidth Product: 1.4MHz
• Current - Input Bias: 100nA
• Voltage - Input Offset: 500µV
• Current - Supply: 18mA
• Current - Output / Channel: 3A
• Voltage - Supply, Single/dual (±): 5 V ~ 40 V, ±2.5 V ~ 20 V
• Operating Temperature: -25°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: TO-3-8
• Number Of Channels: 1
• Voltage Gain Db: 100 dB
• Common Mode Rejection Ratio (min): 60 dB
• Input Offset Voltage: 7 mV
• Operating Supply Voltage: 9 V, 12 V, 15 V, 18 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Maximum Dual Supply Voltage: +/- 20 V
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Contains lead / RoHS compliant by exemption
• Output Type: -
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Details
• Other names: 598-1350

PA74/76 • PA74A/76A
GENERAL
ations" which covers stability, supplies, heatsinking, mounting,
SOA interpretation, and specification interpretation. Visit www.
Cirrus.com for design tools that help automate tasks such as
calculations for stability, internal power dissipation, heatsink
selection; Apex Precision Power's complete Application Notes
library; Technical Seminar Workbook; and Evaluation Kits.
STABILITY CONSIDERATIONS
that present special stability problems. This is primarily due to
non-complementary (both devices are NPN) output stages with
a mismatch in gain and phase response for different polarities
of output current. It is difficult for the opamp manufacturer to
optimize compensation for all operating conditions.
SAFE OPERATING AREA (SOA)
op amp. For a given application, the direction and magnitude
of the output current should be calculated or measured and
checked against the SOA curves. This is simple for resistive
loads but more complex for reactive and EMF generating loads.
THERMAL CONSIDERATIONS
washer, RCS = .1 to .2°C/W, is the only recommended interface
for the PA74/76. Internal power dissipation increases directly
with frequency therefore it is critical to sufficiently heat sink
the PA74 and PA76. Even unloaded the PA74 and PA76 can
dissipate up to 3 watts while running at higher frequencies.
4
Please read Application Note 1 "General Operating Consider-
All monolithic power op amps use output stage topologies
The SOA curves combine the effect of all limits for this power
Thermal grease or a Apex Precision Power TW03 thermal
1.0
0.1
10
1.0
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE, V
TWO AMPLIFIERS LOADED
ONE AMPLIFIER
LOADED
DC, T
C
= 85°C
SOA
10
DC, T
C
= 25°C
S
- V
O
100
(V)
P r o d u c t I n n o v a t i o n F r o m
PARALLEL CONFIGURATION CONSIDERATIONS
the desired current output requirements. The parallel configura-
tion inherently creates internal losses due to circulating currents.
The circulating currents generate power losses through the
current sharing resistors when delivering current to the load.
generates supply currents while high voltage sign waves are
seen at the output. Listed below are the supply currents expected
while running at a particular frequency and when VO ≈ 15Vpp,
note that the outputs are not loaded.
sensitive to operation in the saturation region. The PA74 and
PA76 may exhibit large peak currents; this is mainly due to
thermal protection limitations.
The PA74 and PA76 utilize a parallel configuration to achieve
The parallel configuration used in the PA74 and PA76 also
The parallel configuration used in the PA74 and PA76 is
70
60
50
40
30
20
10
0
0
LOSSES
SUPPLY CURRENT
SATURATION OPERATION
Frequency
ONE AMPLIFIER LOADED
TWO AMPLIFIERS LOADED
10KHz
15KHz
100Hz
1KHz
5KHz
25
CASE TEMPERATURE, T
POWER DERATING
Supply Current
50
18mA
20mA
32mA
50mA
75mA
75
C
(°C)
100
PA74-76U
125