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LM48511SQ bảng dữ liệu(PDF) 6 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  Mono, Class D Audio Power Amplifier
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ÌLM48511
SNAS416H – JULY 2007 – REVISED AUGUST 2015
www.ti.com
6.6 Electrical Characteristics VDD = 3.6 V
The following specifications apply for VDD = 3.6 V, PV1 = 7 V (continuous mode), AV = 2 V/V, R3 = 25.5 kΩ, RLS = 5.36 kΩ,
RL = 8 Ω, f = 1 kHz, SS/FF = GND, unless otherwise specified. Limits apply for TA = 25°C.
(1)
PARAMETER
TEST CONDITIONS
MIN
TYP(2)
MAX
UNIT
Fixed Frequency Mode
16
mA
(FF)
Quiescent Power Supply
IDD
VIN = 0, RLOAD = ∞
Current
Spread Spectrum Mode
17.5
26.6
mA
(SS)
ISD
Shutdown Current(3)
VSD_BOOST = VSD_AMP = SS = FB_SEL = GND
0.03
1
μA
VIH
Logic Voltage Input High
1.4
0.96
V
VIL
Logic Voltage Input Low
0.4
0.84
V
TWU
Wake-up Time
CSS = 0.1 μF
50
ms
VOS
Output Offset Voltage
See (4)
0.04
mV
RL = 8 Ω, f = 1 kHz,
FF
2.5
BW = 22 kHz
W
SS
2.5
THD+N = 1%
RL = 8 Ω, f = 1 kHz,
FF
3
BW = 22 kHz
W
SS
3
THD+N = 10%
PO
Output Power
RL = 4 Ω, f = 1 kHz,
FF
4.3
BW = 22 kHz
W
SS
4.2
THD+N = 1%
RL = 4 Ω, f = 1 kHz,
FF
5.4
BW = 22 kHz
W
SS
5.3
THD+N = 10%
FF
0.03%
PO = 1.5 W, f = 1 kHz,
RL = 8 Ω
SS
0.03%
Total Harmonic
THD+N
Distortion + Noise
FF
0.04%
PO = 3 W, f = 1 kHz,
RL = 4 Ω
SS
0.05%
f = 20 Hz to 20 kHz
FF
35
Inputs to AC GND, No
µVRMS
SS
36
weighting
εOS
Output Noise
f = 20 Hz to 20 kHz
FF
25
Inputs to AC GND, A
µVRMS
SS
26
weighted
VRIPPLE = 200 mVP-P
FF
85
Sine,
dB
SS
86
fRIPPLE = = 217 Hz
Power Supply Rejection
VRIPPLE = 200 mVP-P
FF
87
PSRR
Ratio
Sine,
dB
SS
86
(Input Referred)
fRIPPLE = = 1 kHz
VRIPPLE = 200 mVP-P
FF
78
Sine,
dB
SS
77
fRIPPLE = = 10 kHz
Common-Mode
VRIPPLE = 1 VP-P, fRIPPLE = 217 Hz
CMRR
Rejection Ratio
73
dB
(Input Referred)
η
Efficiency
f = 1 kHz, RL = 8 Ω, PO = 1 W
77%
Feedback Pin Reference
VFB
1.23
V
Voltage(5)
(1)
RL is a resistive load in series with two inductors to simulate an actual speaker load for RL = 8Ω, the load is 15μH+8Ω+15μH. For
RL = 4 Ω, the load is 15 μH + 4 Ω + 15 μH.
(2)
Typical values represent most likely parametric norms at TA = +25ºC, and at the Recommended Operation Conditions at the time of
product characterization and are not specified.
(3)
Shutdown current is measured with components R1 and R2 removed.
(4)
Offset voltage is determined by: (IDD (with load) — IDD (no load)) x RL.
(5)
Feedback pin reference voltage is measured with the Audio Amplifier disconnected from the Boost converter (the Boost converter is
unloaded).
6
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Product Folder Links: ÌLM48511


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