English

2X3W Ultra low EMI Class-D Amplifier
Description
Features
The BL6316 is a high efficiency, 3W/channel
stereo class-D audio power amplifier. A Low noise,
filterless architecture eliminates the out filter, it
required few external components for operation to
save the board space and cost.
Operating from a single 5V supply, the BL6316 is
capable of driving 3.2W/CH into 3 Ω at 5V.
The BL6316 features shutdown and mute controls
functions. High PSRR and differential architecture
provide increased immunity to noise and RF
rectification.
The BL6316 is available in SOP-16 PB-Free
package.
Typical Application
BL6316
Low EMI Emission
Filterless Class-D Architecture
Output Power
－3.2W/ch (VDD=5.0V, RL =3Ω, THD+N=10%)
－1.7W/ch (VDD=5.0V, RL =8Ω, THD+N=10%)
Supply Voltage:2.2V to 5.0V
Low THD+N and Low Noise
High Efficiency up to 85%
Short Circuit auto Recovery and Thermal
Protection
Few External Components to Save the Space
and Cost
Applications
Portable DVD Players
Notebook PC
USB Speakers, Portable Speaker
LCD TV/LCD Monitor
Pin Configuration
PVDD
VDD
470uF
1uF
1uF
6
VDD
0.1uF
13
4
PVDD
INL
7
1
OUTL+
DAC
0.1uF 10
OUTL-
INR
3
1uF 8
BYPASS
14
OUTR-
12
SHDN
OUTR+
5
16
MUTE
GND NC
11
Page1
9
PGND
2
15
www.belling.com.cn
V1.0
2X3W Ultra low EMI Class-D Amplifier
BL6316
Block Diagram
Pin Descriptions
Name Pin No.
I/O
1
OUTL+
2,15
PGND
3
OUTL-
4,13
PVDD
5
MUTE
6
VDD
7
INL
I
Left Channel Input Pin
8
BYPASS
I
Tap to voltage divider for internal midsupply bias generator used for
analog reference
9
NC
10
INR
11
GND
12
O
Pin Description
Left Channel Positive Audio Output
Power Ground
O
Left Channel Negative Audio Output
Supply Voltage Terminal for Power Stage
I
Mute Control Input Pin（active low）
Analog Supply Voltage Terminal
No Connection
I
Right Channel Input Pin
Analog Power Supply Ground
I
Shutdown Control Input Pin (active low)
SHDN
14
OUTR-
O
Right Channel Negative Audio Output
16
OUTR+
O
Right Channel Positive Audio Output
Page2
www.belling.com.cn
V1.0
BL6316
2X3W Ultra low EMI Class-D Amplifier
Ordering Information
Order Number
Package Type
Marking
Packing
BL6316
SOP-16
BL6316
XXXXX
Reel Tape
Tube
Absolute Maximum Ratings (Over operating free-air temperature, unless otherwise noted)
Vss
Supply voltage
-0.3V to 5.5V
VI
Input voltage
-0.3V to VDD+0.3V
TA
Operation free-air temperate range
-40°C to 85°C
TJ
Operation free-air junction temperature
-40°C to 1 25°C
TSTG
Storage temperature range
-65°C to 150°C
TSLD
Soldering temperature
300°C, 5sec
Recommended Operating Conditions
MIN
MAX
UNIT
5.0
V
VSS
Supply Voltage
AVDD, PVDD
2.2
VIH
Enable Input High Voltage
VDD=5.0V
1.3
VIL
Enable Input Low Voltage
VDD=5.0V
VIH
Mute Input High Voltage
VDD=5.0V
VIL
Mute Input Low Voltage
VDD=5.0V
V
0.4
1.3
V
0.4
Thermal Information
Parameter
Symbol
Package
MAX
UNIT
Thermal Resistance (Junction to Ambient)
θJA
SOP-16
110
°C/W
Thermal Resistance (Junction to Case)
θJC
SOP-16
23
°C/W
Page3
www.belling.com.cn
V1.0
BL6316
2X3W Ultra low EMI Class-D Amplifier
Electrical Characteristics (VDD =5V, Gain=21dB, R =8Ω, T =25°C , unless otherwise noted.)
Symbol
Parameter
VIN
Supply Power
Test Conditions
MIN
2.2
THD+N=10%,f=1KHZ,RL=4Ω
THD+N=1%,f=1KHZ,RL=4Ω
PO
Output Power
THD+N=10%,f=1KHZ,RL=8Ω
THD+N=1%,f=1KHZ,RL=8Ω
VDD=5.0V, PO=0.5W, RL=8Ω
THD+N
Total Harmonic
VDD=3.6V, PO=0.5W, RL=8Ω
Distortion Plus Noise
VDD=5.0V, PO=1W, RL=4Ω
GV
Gain
PSRR
Power Supply Ripple
VDD=5.0V, Inputs
Rejection
ac-grounded with CIN=0.47µF
Crosstalk
SNR
Signal-to-Noise Ratio
Vn
Output Noise
Dyn
Dynamic range
η
Efficiency
VDD=5.0V
2.8
VDD=3.6V
1.3
VDD=5.0V
2.1
VDD=3.6V
1
VDD=5.0V
1.7
VDD=3.6V
0.8
VDD=5.0V
1.20
VDD=3.6V
0.6
f=1KHz
f=1KHz
VDD=3.6V, PO=1W, RL=4Ω
CS
5.0
V
W
W
W
W
0.15
%
0.14
0.18
%
0.16
f=1KHz
-55
dB
f=1KHz
-85
dB
f=1KHz
82
dB
VDD=5.0V,Inputs floating with
A-weighting
87
CIN=0.47µF
No A-weighting
136
VDD=5.0V,THD=1%
f=1KHz
90
dB
85
%
VDD=5.0V,PO=0.5W, RL=8Ω,
GV=25dB
VDD=5.0V,Vorms=1V,
GV=25dB
RL=8Ω,THD=10%
RL=4Ω,THD=10%
VDD=5.0V
f=1KHz
IMUTE
Muting Current
VDD=5.0V
VMUTE=0.3V
ISD
Shutdown Current
VDD=2.5V to 5.5V
VSD=0.3V
Vos
Output Offset Voltage
VIN=0V, VDD=5V
No Load
VDD=3.0V
Protection
No Load, Junction
Over Temperature
Temperature
www.belling.com.cn
µV
80
5
mA
3.6
3.5
mA
1
10
Over Temperature
Hysterisis
Page4
UNIT
dB
Quiescent Current
OTH
MAX
25
IQ
OTP
TYP
µA
mV
135
°C
VDD=5.0V
20
V1.0
BL6316
2X3W Ultra low EMI Class-D Amplifier
Typical Operating Characteristics
(VDD =5V, Gain=21dB, RL =8Ω, T =25°C, unless otherwise noted.)
THD+N vs Output Power
THD+N vs Output Power
20
10
20
RL=3ohm Gain=21dB
VDD= 3.6V , 4.2V , 5V
10
5
RL=4ohm Gain=21dB
VDD= 3.6V , 4.2V , 5V
5
2
2
%
%
1
1
0.5
0.5
0.2
0.2
0.1
1m 2m
5m 10m
100m
500m 1
2
0.1
1m 2m
4
5m 10m
W
THD+N VS vs Output Power
RL=8ohm Gain=21dB
VDD=3.6V , 4.2V , 5V
5
2
%
%
1
0.2
0.1
0.05
0.2
0.02
5m 10m
2 4
100m
500m 1
0.01
20
2
RL=8ohm Gain=21dB
Vo=1Vp-p
2
1
0.5
0.5
0.1
1m 2m
500m 1
THD+N VS FREQUENCY
20
10
5
20
10
100m
W
50 100 200
500 1k
2k
5k
20k
Hz
W
NOISE FLOOR FFT
Frequency Response
+22
-40
RL=8ohm Gain=21dB
+21
-60
d
B
V
d
B
g
-80
A
-100
+20
+19
+18
RL=8ohm Gain=21dB
+17
Vo=1Vp-p
-120
10
20
50 100 200
500 1k 2k
5k 10k 20k
+16
20
500 1k
2k
5k
20k
Hz
Hz
Page5
50 100 200
www.belling.com.cn
V1.0
2X3W Ultra low EMI Class-D Amplifier
BL6316
Application Information
Mute Operation
The MUTE pin is an input for controlling the output
state of the BL6316. A logic high on this pin
enables the outputs, a logic low on this pin disables
the outputs. The terminal may be used as a quick
disable/enable of the outputs when changing
channels between different audio sources. The
MUTE pin can be left floating due to the internal
damage to the device when the internal die
temperature exceeds 135°C. There is a ±20°C
tolerance on this trip point from device to device.
Once the die temperature exceeds the thermal set
point, the device enters into the shutdown state
and the outputs are disabled. This is not a latched
fault. The thermal fault is cleared once the
temperature of the die is reduced by 30°C. The
device begins normal operation at this point with no
external system intervention.
pull-up.
Maximum Gain
Shutdown operation
The BL6316 employs a shutdown mode of
operation designed to reduce supply current to the
absolute minimum level during periods of nonuse
for power conservation. The SHDN input terminal
should be held high during normal operation when
the amplifier is in use. The SHDN pin can be left
The BL6316 has two internal amplifier stages. The
first stage's gain is externally configurable, while
the second stage's is internally fixed. The
differential gain for the IC is
A =20*log [2*((Rf /(Ri +Re ))]
Where Re is externally resistor, The BL6316 Rf
=180kΩ, Ri =20kΩ, so the maximum closed-gain is
25dB (no externally resistor).
Decoupling Capacitor (Cs)
floating due to the internal pull-up.
Under Voltage Lock-out (UVLO)
The BL6316 incorporates circuitry designed to
detect low supply voltage. When the supply voltage
drops to 1.8V or below, the BL6316 outputs are
disabled, and the device comes out of this state
and starts to normal function when VDD ≥2.0V.
Short -Circuit Protection
The BL6316 has short circuit protection circuitry on
the outputs to prevent damage to the device during
output-to-output shorts and output-to-GND short
occurs. When a short circuit is detected on the
outputs, the part immediately disables the drive.
This is an unlatched fault. Normal operation is
restored when the fault is removed.
Thermal Protection
The BL6316 is a high-performance Class-D audio
amplifier that requires adequate power supply
decoupling to ensure the efficiency is high and total
harmonic distortion (THD) is low. For higher
frequency transients, spikes, or digital hash on the
line a good low equivalent series resistance (ESR)
ceramic capacitor, typically 1µF, placed as close
as possible to the device PVDD lead works best.
Placing this decoupling capacitor close to the
BL6316 is important for the efficiency of the
Class-D amplifier, because any resistance or
inductance in the trace between the device and the
capacitor can cause a loss in efficiency. For
filtering lower-frequency noise signals, a 4.7µF or
greater capacitor placed near the audio power
amplifier would also help, but it is not required in
most applications because of the high PSRR of this
device.
Thermal protection on the BL6316 prevents
Page6
www.belling.com.cn
V1.0
2X3W Ultra low EMI Class-D Amplifier
Input Capacitors (Ci )
The input capacitors and input resistors from a
high-pass filter with the corner frequency, fc,
determined in below equation
The value of input capacitor is important to
consider as it directly affects the bass (low
frequency) performance of the circuit. Speaker in
wireless phones cannot usually respond well to low
frequencies, so the corner frequency can be set to
block low frequencies in this application. Not using
input capacitors can increase out offset. Below
equation is used to solve for the input coupling
capacitance.
If the corner frequency is within the audio band, the
capacitors should have tolerance of ± 10% or
better, because any mismatch in capacitance
causes an impedance mismatch at the corner
frequency and below.
Analog
(CBYP )
Reference
Bypass
Capacitor
The Analog Reference Bypass Capacitor (CBYP) is
the most critical capacitor and serves several
important functions. During start-up or recovery
from shutdown mode, C determines the rate at
which the amplifier starts up. The second function
is to reduce noise caused by the power supply
coupling into the output drive signal. This noise is
Page7
BL6316
from the internal analog reference to the amplifier,
which appears as degraded PSRR and THD+N.
A ceramic bypass capacitor (CBYP ) with values of
0.47µF to 1.0µF is recommended for the best THD
and noise performance. Increasing the bypass
capacitor reduces clicking and popping noise from
power on/off and entering and leaving shutdown.
Filter Free Operation and Ferrite Bead
Filters
A ferrite bead filter can often be used if the design
is failing radiated emissions without an LC filter and
the frequency sensitive circuit is greater than 1MHz.
This filter functions well for circuits that just have to
pass FCC and CE because FCC and CE only test
radiated emissions greater than 30MHz. When
choosing a ferrite bead, choose one with high
impedance at high frequencies, and very low
impedance at low frequencies. In addition, select a
ferrite bead with adequate current rating to prevent
distortion of the output signal.
Use an LC output filter if there are low frequency (<
1 MHz) EMI sensitive circuits and/or there are long
leads from amplifier to speaker.
Ferrite Bead Filter to reduce EMI
www.belling.com.cn
V1.0
2X3W Ultra low EMI Class-D Amplifier
BL6316
Outline Dimension
SOP-16
Page8
www.belling.com.cn
V1.0