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Número de pieza | BD5445EFV | |
Descripción | Analog Input / Single End Output Class-D Speaker Amplifier | |
Fabricantes | ROHM Semiconductor | |
Logotipo | ||
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Middle Power Class-D Speaker Amplifiers
Analog Input /
Single End Output
Class-D Speaker Amplifier
BD5445EFV
No.10075EBT16
●Overview
BD5445EFV is a Analog input type Class D Speaker Amplifier designed for Flat-panel TVs in particular for space-saving
and low-power consumption, delivers an output power of 17W+17W. This IC employs state-of-the-art Bipolar, CMOS, and
DMOS (BCD) process technology that eliminates turn-on resistance in the output power stage and internal loss due to line
resistances up to an ultimate level. With this technology, the IC can achieve high efficiency of 91% (10W+10W output with
8Ω load).In addition, the IC is packaged in a compact reverse heat radiation type power package to achieve low power
consumption and low heat generation and eliminates necessity of external heat-sink up to a total output power of 34W. This
product satisfies both needs for drastic downsizing, low-profile structures and powerful, high-quality playback of sound
system.
●Features
1) 17W stereo single-ended outputs
34W mono bridge-tied-load output
2) Wide supply voltage (From 10V to 27V)
3) Four selectable gain (14, 20, 26, 32dB)
4) Master / Slave function
5) Soft-start and Soft-mute
6) Low noise, Low distortion
7) Various protection functions
(High temperature, Output short, Under voltage)
8) Small power package (HTSSOP-B28)
●Applications
Flat Panel TVs (LCD, Plasma), Home Audio, Desktop PC, Amusement equipments, Electronic Music equipments, etc.
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
1/31
2010.05 - Rev.B
1 page BD5445EFV
●Typical Characteristics Data (SE×2ch)Measured on ROHM’s evaluation board.
Technical Note
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40
35
30
25
20
15
10
5
0
-5
-10
10
Gain=38dB
Gain=32dB
Gain=26dB
Gain=20dB
Vcc=24V
RL=8Ω
Po=1W
L=47uH
C=0.39uF
100
1000
10000
FREQUENCY(Hz)
100000
Fig.7 Frequency-Voltage gain
0
-20
Vcc=24V
-40 RL=8Ω
No Signal
-60 BW=20~20kHz
-80
-100
-120
-140
10
100
1000
10000
FREQUENCY(Hz)
100000
Fig.8 FFT of Output Noise Voltage
Vcc=24V
Gain=20dB
FILP=22uF
10V/div.
Speaker
Output
FILP
2V/div.
PDX
10V/div.
50ms/div.
Fig.9 Waveform when releasing Power-down
Vcc=24V
Gain=20dB
FILP=22uF
10V/div.
Speaker
O u tpu t
2V/div.
FILP
10V/div.
PDX 50ms/div.
Fig.10 Waveform when activating Power-down
Vcc=24V
Po=1W
fin=200Hz
Speaker
Output
Speaker
O u tpu t
Vcc=24V
Po=1W
fin=200Hz
2V/div.
10V/div.
MUTEX
10ms/div.
Fig.11 Waveform when releasing Soft-mute
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
5/31
2V/div.
10V/div.
MUTEX
10ms/div.
Fig.12 Waveform when activating Soft-mute
2010.05 - Rev.B
5 Page BD5445EFV
●Pin function explanation (Provided pin voltages are typ. values)
Pin
No.
Pin name
Pin voltage
Pin explanation
1 VCCA
Vcc Power supply pin for Analog signal
2 GAIN0
3 GAIN1
- Gain control pin
Technical Note
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Internal equivalence circuit
4 IN1
5 IN2
2.5V
ch1 Analog signal input pin
ch2 Analog signal input pin
Input audio signal via a capacitor.
6 GNDA
7 FILA
0V
2.5V
Gnd pin for Analog signal
Bias pin for Analog signal
Please connect the capacitor.
1
16K~40K
4/5
40K~64K
6
8 FILP
2~4V
Bias pin for PWM signal
Please connect the capacitor.
1
8
9 ROSC
2.5V
Internal PWM sampling clock frequency
setting pin
Please connect the resister setting Master
mode.
Please connect the capacitor setting Slave
mode.
6
10 PDX
- Power down control pin
H: Power down OFF
L: Power down ON
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
11/31
2010.05 - Rev.B
11 Page |
Páginas | Total 32 Páginas | |
PDF Descargar | [ Datasheet BD5445EFV.PDF ] |
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