PA16_09 Datasheet, PDF (4/7 Pages) Cirrus Logic – Power Operational Amplifiers

PA16 • PA16A
Product Innovation From
NOTES:
1. (All Min/Max characteristics and specifications are guaranteed over the Specified Operating Condi-
tions. Typical performance characteristics and specifications are derived from measurements taken
at typical supply voltages and T_C = 25°C).
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate
power dissipation to achieve high MTTF.
* The specification of PA16A is identical to the specification for PA16 in applicable column to the left.
3. The power supply voltage for all specifications is the TYP rating unless otherwise noted as a test
condition.
4. +V_S and –V_S denote the positive and negative supply rail respectively. Total V_S is measured from +V_S
to –V_S.
5. Rating applies if the output current alternates between both output transistors at a rate faster than
60Hz.
6. Exceeding CMV range can cause the output to latch.
7. Full temperature specifications are guaranteed but not 100% tested.
8. The absolute maximum negative input voltage is equal to the negative power supply voltage plus 1V
(-V_S + 1V).
TYPICAL APPLICATION
Vehicular Sound System Power Stage
When system voltages are low and power is at a pre-
mium, the PA16 is a natural choice. The circuit above
utilizes not only the feature of low internal loss of the
PA16, but also its very low distortion level to imple-
ment a crystal clear audio amplifier suitable even for
airborne applications. This circuit uses AC coupling
of both the input signal and the gain circuit to render
DC voltage across the speaker insignificant. The re-
sistor and capacitor across the inputs form a stabil-
ity enhancement network. The 0.27 ohm current limit
resistors provide protection in the event of an output
short circuit.
100K
.47µF _16K
+12 _RCL+
.27Ω
1K
IN
.001µF
.47µF
16K
PA16
R_CL–
3.2Ω
16W
.27Ω
–12
LOW INTERNAL LOSS MAXIMIZES EFFICIENCY
TYPICAL PERFORMANCE GRAPHS
POWER DERATING
70
OUTPUT VOLTAGE SWING
3.5
CURRENT LIMIT
3.0
60
50
40
30
20
10
0
0
25
50 75 100 125
CASE TEMPERATURE, T_C (°C)
SMALL SIGNAL RESPONSE
120
100
80
4 ⁶⁰
40
20
3.0
2.5
T_C = 25 to 85°C
2.0
1.5
±V_O
1.0
.5
0
1
2
3
4
5
OUTPUT CURRENT, I_O (A)
PHASE RESPONSE
0
–30
–60
–90
–120
–150
2.5
2.0
R_CL = 0.3Ω
1.5
1.0
R_CL = 0.62Ω
.5
0
–25 0
25 50 75 100 125
CASE TEMPERATURE, T_C (°C)
POWER RESPONSE
30
| +V_S | + | –V_S | = 36V
23
18
13 ^{| +VS | + | –VS | = 30V}
PA16U
10