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Rohm BD5446EFV Technical Note

Middle power class-d speaker amplifiers
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Middle Power Class-D Speaker Amplifiers
Class-D Speaker Amplifier
for Digital Input
BD5446EFV
●Description
BD5446EFV is a Class D Speaker Amplifier designed for Flat-panel TVs in particular for space-saving and low-power
consumption, delivers an output power of 20W+20W. 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 87% (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 40W. This product
satisfies both needs for drastic downsizing, low-profile structures and many function, high quality playback of sound system.
●Features
1) BD5446EFV has two system of digital audio
2
(I
S/LJ format, SDATA: 16 / 20 / 24bit, LRCLK: 32kHz / 44.1kHz / 48kHz, BCLK: 64fs (fixed), SYS_CLK: 256fs (fixed))
2) Within the wide range of the power supply voltage, it is possible to operate in a single power supply. (10~26V)
3) It contributes to miniaturizing, making to the thin type, and the power saving of the system by high efficiency and low heat.
4) S/N of the system can be optimized by adjusting the gain setting among 8 steps. (20~34dB / 2dB step)
5) It has the output power limitation function that can be adjusted to an arbitrary output power.
6) The decrease in sound quality because of the change of the power supply voltage is prevented with the feedback
circuitry of the output. In addition, a low noise and low distortion are achieved.
7) It provides with the best stereo DAC output for the headphone usage. As a result, the output of the selection of the
digital input in two systems is possible.
8) Eliminates pop noise generated when the power supply goes on/off, or when the power supply is suddenly shut off.
High quality muting performance is realized by using the soft-muting technology.
9) BD5446EFV is a highly reliable design to which it has various protection functions.
(High temperature protection, Under voltage protection, Output short protection, Output DC voltage protection and
Clock stop protection)
●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.
interface.
1/30
www.DataSheet4U.com
No.10075EBT14
2010.05 - Rev.B

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Summary of Contents for Rohm BD5446EFV

  • Page 1 No.10075EBT14 ●Description BD5446EFV is a Class D Speaker Amplifier designed for Flat-panel TVs in particular for space-saving and low-power consumption, delivers an output power of 20W+20W. 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.
  • Page 2 Minimum load impedance Ω L_SP (Speaker Output) Minimum load impedance kΩ Pin 22, 23 L_DA (DAC Output) *6 Do not, however exceed Pd. * No radiation-proof design. www.rohm.com 2010.05 - Rev.B 2/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 3 NOR_DA -∞dBFS, BW=IHF-A *7 These items show the typical performance of device and depend on board layout, parts, and power supply. The standard value is in mounting device and parts on surface of ROHM’s board directly. www.rohm.com 2010.05 - Rev.B 3/30 ©...
  • Page 4 BW=20～20KHz 5V/div 5V/div MUTEX 2V/div 2V/div MUTEX 10ms/div 10ms/div -100 100k FREQUENCY(Hz) Fig.10 Fig.11 Fig.12 Wave form when Wave form when Crosstalk –Frequency Releasing Soft-mute Activating Soft-mute www.rohm.com 2010.05 - Rev.B 4/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 5 OUTPUT POWER(W) FREQUENCY(Hz) OUTPUT POWER(W) Fig.17 Fig.16 Fig.18 THD+N - Output power THD+N - Frequency Crosstalk - Output power Po=1W BW=20～20KHz -100 100k FREQUENCY(Hz) Fig.19 Crosstalk - Frequency www.rohm.com 2010.05 - Rev.B 5/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 6 Gain Selector Driver GNDP2 TEST Driver Selector REG_G2 High Temperature Protection VCCA Under Voltage Protection Clock Stop Protection Output Short Protection Output DC Voltage Protection VCCP2 REG_G2 www.rohm.com 2010.05 - Rev.B 6/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 7 FILA 2.5V Please connect the capacitor. Internal power supply pin for Digital circuit REG3 3.3V Please connect the capacitor. 500K GNDA GND pin for Analog signal － www.rohm.com 2010.05 - Rev.B 7/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 8 Test pin TEST1 19,20 TEST2 Please connect to GND. DAC output selection terminal SEL_DAC H: SDATA2 is output from the DAC L: SDATA1 is output from the DAC www.rohm.com 2010.05 - Rev.B 8/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 9 Please connect pull-up resistor. ERROR 3.3V H: While Normal L: While Error Power supply pin for Analog signal VCCA － 26,30 34,35 Non connection pin N.C. － － 41,47 48,52 www.rohm.com 2010.05 - Rev.B 9/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 10 Please connect the capacitor. Output pin of ch1 positive PWM 50,51 OUT1P Vcc~0V Please connect to Output LPF. 45,46 53,54 VCCP1 Power supply pin for ch1 PWM signal － www.rohm.com 2010.05 - Rev.B 10/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 11 PWM output Power Down (12pin) (11pin) (24,25pin) (33,34,38,39,43,44,48pin) L or H HiZ_Low HiZ_Low Normal operation Normal operation ●IIS_LJ pin function IIS_LJ Digital data format (15pin) Left Justified www.rohm.com 2010.05 - Rev.B 11/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 12 ●For voltage gain (Gain setting) BD5446EFV prescribe voltage gain at speaker output (BTL output) under the definition 0dBV (1Vrms) as full scale input of the digital audio input signal. For example, digital audio input signal = Full scale input, Gain setting = 20dB, Load resistance = 8Ω...
  • Page 13 Left-Justified Data Format 64fs, 16 bit Data The High section of LRCLK becomes Lch, the Low section of LRCLK becomes Rch. After changing LRCLK, first bit becomes MSB. www.rohm.com 2010.05 - Rev.B 13/30 © 2010 ROHM Co., Ltd. All rights reserved.

  • Page 14: Power Supply Start-Up Sequence

    ③Degital audio data communication. LRCLK (9pin) SDATA1 (10pin) SDATA2 (11pin) PDX (14pin) ④Set PDX to High. OUT_DAC1 (23pin) OUT_DAC2 (22pin) MUTEX (13pin) ⑤Set MUTEX to High. Soft-start 43msec(fs=48kHz) Speaker output www.rohm.com 2010.05 - Rev.B 14/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 15 ③Stop digital audio date signal. LRCLK (9pin) SDATA1 (10pin) SDATA2 (11pin) PDX (14pin) ②Set PDX to Low. OUT_DAC1 (23pin) OUT_DAC2 (22pin) MUTEX (13pin) ①Set MUTEX to Low. Soft-mute 43msec(fs=48kHz) www.rohm.com 2010.05 - Rev.B 15/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 16 The following procedures ① or ② is available for recovery. ①After the MUTEX pin is made Low once, the MUTEX pin is returned to High again. ②Turning on the power supply again. www.rohm.com 2010.05 - Rev.B 16/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 17 120℃ OUT1P (50, 51pin) OUT1N (43, 44pin) OUT2P (31, 32pin) OUT2N (38, 39pin) HiZ-Low Soft-mute Soft-start 43msec(fs=48KHz) Speaker output 43msec(fs=48KHz) ERROR (24pin) 3.3V OUT_DAC1 (23pin) OUT_DAC2 (22pin) www.rohm.com 2010.05 - Rev.B 17/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 18 VCCP2 (28, 29pin) OUT1P (50, 51pin) OUT1N (43, 44pin) OUT2P (31, 32pin) OUT2N (38, 39pin) HiZ-Low Soft-mute Soft-start 43msec(fs=48kHz) Speaker output 43msec(fs=48kHz) ERROR (24pin) 3.3V OUT_DAC1 (23pin) OUT_DAC2 (22pin) www.rohm.com 2010.05 - Rev.B 18/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 19 1μsec clock stop. OUT1P (50, 51pin) OUT1N (43, 44pin) OUT2P (31, 32pin) HiZ-Low OUT2N (38, 39pin) Soft-start 43msec(fs=48kHz) Speaker output ERROR (24pin) 3.3V OUT_DAC1 (23pin) OUT_DAC2 (22pin) Unstable www.rohm.com 2010.05 - Rev.B 19/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 20 OUT1N (43, 44pin) OUT2P (31, 32pin) OUT2N (38, 39pin) Released from latch state. PWM out ：　IC latches with HiZ-Low. Over current 10A(TYP.) ERROR (24pin) １μsec(TYP.) MUTEX(13pin) Latch release www.rohm.com 2010.05 - Rev.B 20/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 21 PWM output ：　IC latche with HiZ-Low. Speaker output Soft-start Protection start surge current 43msec(fs=48kHz) into speaker output for 43msec (fs=48kHz) and over. ERROR (24pin) MUTEX(13pin) Latch release www.rohm.com 2010.05 - Rev.B 21/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 22 Speaker output 5pin 3.3V Soft Clip 1μF 1μF Fig-27 GNDA Fig-26 VCC=13V, RL=8Ω, f=1kHz Gain=20dB, 5pin=3.3V 3pin terminal voltage [V] Fig.28 Output power – 3pin terminal voltage www.rohm.com 2010.05 - Rev.B 22/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 23 High Temperature Protection VCCA VCCA Under Voltage Protection 0.1μF Clock Stop Protection GNDA GNDA Output Short Protection C25D 10μF Output DC Voltage Protection GNDP2 VCCP2 3.3μF REG_G2 VCCP2 www.rohm.com 2010.05 - Rev.B 23/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 24 B(±10% ） 1.6mm×0.8mm C22, C23 C31B, C38B 470pF GRM188B11H471KA B(±10% ） 2.0mm×1.2mm C43B, C50B C28D, C53D 220μF ECA1VMH221 ±20% φ8mm×11.5mm Electrolytic Panasonic Capacitor C25D 10μF EEUFC1H100L ±20% φ5mm×11mm www.rohm.com 2010.05 - Rev.B 24/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 25 High Temperature Protection VCCA VCCA Under Voltage Protection 0.1μF Clock Stop Protection GNDA GNDA Output Short Protection C25D 10μF Output DC Voltage Protection GNDP2 VCCP2 3.3μF REG_G2 VCCP2 www.rohm.com 2010.05 - Rev.B 25/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 26 B(±10% ） 1.6mm×0.8mm C22, C23 C31B, C38B 470pF GRM188B11H471KA B(±10% ） 2.0mm×1.2mm C43B, C50B C28D, C53D 220μF ECA1VMH221 ±20% φ8mm×11.5mm Electrolytic Panasonic Capacitor C25D 10μF EEUFC1H100L ±20% φ5mm×11mm www.rohm.com 2010.05 - Rev.B 26/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 27 Use capacitors with a low equivalent series resistance, and good impedance characteristics at high frequency ranges (100kHz or higher). Also, select an item with sufficient withstand voltage because flowing massive amount of high-frequency currents is expected. www.rohm.com 2010.05 - Rev.B 27/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 28 If the impedance characteristics of the speakers at high-frequency range while increase rapidly, the IC might not have stable-operation in the resonance frequency range of the LC-filter. Therefore, consider adding damping-circuit, etc., depending on the impedance of the speaker. www.rohm.com 2010.05 - Rev.B 28/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 29 ・The board on exposed heat sink on the back of package are connected by soldering. PCB① : 1-layer board(back copper foil size: 0mm×0mm), θja＝62.5℃/W PCB② : 2-layer board(back copper foil size: 70mm×70mm),θja＝27.8℃/W PCB③ : 4-layer board(back copper foil size: 70mm×70mm),θja＝20.2℃/W www.rohm.com 2010.05 - Rev.B 29/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 30 0.17 -0.03 0.08 0.65 +0.05 Direction of feed 1pin 0.22 -0.04 0.08 ∗ Reel (Unit : mm) Order quantity needs to be multiple of the minimum quantity. www.rohm.com 2010.05 - Rev.B 30/30 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 31 ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing.