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Class-AB Speaker Amplifiers
1.1W to1.5W Monaural Speaker Amplifier
BD7830NUV
No.10077EAT03
Description The BD7830NUV is a monaural speaker amplifier that operates at low voltage and was developed for portable navigation and mobile audio products. When in standby mode, its current consumption is 0 A, and since it switches quickly and quietly from standby to ON, it is especially well suited for applications where there is frequent switching between standby and ON. Features 1) BTL monaural audio power amplifier 2) High power 2.25W 4at Vcc=5V ,THD+N=10% High power 1.55W 8 at Vcc=5V ,THD+N=10% High power 0.77W 8 at Vcc=3.6V ,THD+N=10% 3) Wide operating supply voltage range: 2.45.5V 4) Low standby current: 0A 5) Fast turn on/off time: 46msec 6) Built-in Fade-in/out function 7) Built-in anti-pop function 8) Built-in thermal shutdown function 9) Very small package (VSON008V2030) Applications Mobile phones, Mobile electronics applications Absolute Maximum Ratings(Ta=+25) Parameter Supply voltage Power dissipation Storage temperature range STBY input range Symbol Vcc Pd Tstg Vstby Ratings 6.0 530 *1 -55+150 -0.1Vcc+0.1 Unit V mW V
*1 ROHM standard one layer board (70mmx70mmx1.6mmt) mounted, deratings is done at 4.24mW/ above Ta=+25.
Operating Range Parameter Temperature range Supply voltage Symbol Topr Vcc Ratings -40+85 +2.4+5.5 Unit V
This product is not designed for protection against radioactive rays.
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1/17
2010.06 - Rev.A
BD7830NUV
Electrical characteristics Parameter Supply current Standby supply current Output power Total harmonic distortion Voltage gain1 Voltage gain2 Power supply rejection ratio Mute attenuation Output voltage Output offset voltage STBY release voltage STBY hold voltage STBY input current H STBY input current L (Unless otherwise noted, Ta=+25, Vcc=+3.0V, f=1kHz, RL=8) Limit Monitor Symbol Unit pin MIN. TYP. MAX. ICC ISTBY PO THD+N AV1 AV2 PSRR MUTE Vo Vo VSTBYH VSTBYL ISTBYH ISTBYL 280 -1 -1 40 60 1.35 -40 1.4 -0.1 20 -2 3.2 0 420 0.1 0 0 57 80 1.5 0 30 0 6.8 2 0.5 +1 +1 1.65 +40 Vcc+0 .1 0.4 40 mA A mW % dB dB dB dB V mV V V A A 6 6 5&8 5&8 5 8 5&8 5&8 5&8 5&8 1 1 1 1
Technical Note
Condition Active mode Standby mode BTL, THD+N=1% *1 BTL, Po=150mW *1 Vin=-20dBV, 1stAmp Vin=-20dBV, 2ndAmp BTL, Vripple=0.2Vpp, *2 BTL, Vin=-20dBV Vin=0V Vo=|Vo1-Vo2| Active mode Standby mode VSTBY =3V VSTBY =0V
*1:B.W.=40030kHz, *2:DIN AUDIO, SE:Single End, BTL:The voltage between 5pin and 8pin
Application Circuit Example
STB H : ACTIVE L : STBY 1 BIAS 2 VCC 1F 1 2 ? IN 4 1stAmp SOFT 3
OUT2 8 GND 7 2ndAmp SOFT VDD 6 1F OUT1 5 8
Bias
0.01uF Audio Input
0.1uF 20k
20k
3pin SOFT terminal 1 : Usually 2 : Enable to adjust fade in/out time by external capacitor
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2/17
2010.06 - Rev.A
BD7830NUV
Outer dimension
Technical Note
D78 30
Reference land pattern (adapt as necessary to suit conditions during actual design.) Unit: mm Land Gap MD1 2.20 Length L2 0.70 Width b2 0.27
PKG type VSON008V2030
Lead pitch e
L2
0.50 Central pad
Thermal via Pitch Diameter 0.300
PKG type
MD1 D3
Length Width D3 E3 1.60
VSON008V2030
E3
1.20
This package is a non-lead type, so solderability of the lead ends and sides are not guaranteed.
e
b2
Thermal via
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3/17
2010.06 - Rev.A
BD7830NUV
Measurement Circuit Diagram
Technical Note
VSTBY
A
STBY 1
OUT2 8
V
600 100 Vripple 8
BIAS 2
1 VCC 1 2
Bias 2nd Amp SOFT
GND 7
SOFT 3
VCC 6
50
0.01 0.1 Vin 600
A
1
VCC
IN 4
20k
OUT1 5 1st Amp
V
20k
3pin SOFT terminal 1 : Usually 2 : Enable to adjust fade in/out time by external capacitor
Block diagram
Pin assignment PIN No. PIN Name STBY BIAS SOFT INOUT1 VCC GND OUT2
STBY 1
OUT2 8
1 2
BIAS 2 Bias 2nd SOFT
GND 7
3 4 5 6 7 8
SOFT 3
VCC 6
IN 4 1st Amp
OUT1 5
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4/17
2010.06 - Rev.A
BD7830NUV
Input/output equivalent circuit PIN No. PIN Name PIN description Equivalent circuit
Technical Note
1
STBY
Active/Standby Control pin STBY=H Active STBY=L Standby
STBY
1
50k
100k
BIAS
25k
2
BIAS
Bias capacitor Connection pin
2
20k
600k
100k
1k
100k
SOFT
1k 10k
3
SOFT
Fade-in/out Adjustment pin
3
IN-
1k 1k
4
IN-
Input pin
4
OUT1 (OUT2)
5 8
OUT1 OUT2
Output pin
60k
5 (8)
VCC
6
VCC
Power supply pin
6 7
7
GND
GND pin
GND
Notes) The above numerical values are typical values for the design, which are not guaranteed.
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5/17
2010.06 - Rev.A
BD7830NUV
Description of operations ON/OFF operation by STBY pin
Technical Note
VCC Standby STBY Active Standby
BIAS
Delay (internally fixed
OUT
FADE IN Audio Input FADE OUT Normal input mode
Once VCC = H, when STBY = L H then BIAS and output (OUT) are activated. Once BIAS has become stable (= 1/2 VCC), output (OUT) fades in (FADE IN). Once STBY = H L, output (OUT) starts to fade out (FADE OUT), and when fade-out ends, the BIAS falls. ON/OFF control by shorting of VCC and STBY pins
VCC STBY
Under voltage protection 1.78V (typ)
BIAS
Delay (internally fixed)
OUT
Audio Input
When VCC = STBY = L H, BIAS is activated. During low power mode (VCC < 1.78 V) protection is used to keep output (OUT) at low level, and FADE IN occurs when this protection is canceled. When VCC = STBY = H L, output (OUT) falls without FADE OUT.
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6/17
2010.06 - Rev.A
BD7830NUV
External components and cautions points Setting of external components
STBY STBY 1 OUT2 8 SPEAKER
Technical Note
BIAS 2 Cb SOFT 3 Cs SP_IN Ci Ri IN 4 1stAmp SOFT 2ndAmp Bias
GND 7 1 VCC 6
8
OUT1 5
Rf Cf
Cb This is a bypass capacitor, which is used for bias voltage stabilization. When a larger capacitor is used, the efficiency of voltage ripple rejection can be improved. When tuning, note with caution that Cb can affect the activation time. Cb - Power Supply Ripple Rejection Ratio
Cb-PSRR Vcc=3V, Vripple=200mVpp, RL=8
Cb - Turn-on Time
Cb-ton 80
0 -10 -20 -30 -40 -50
Cb=2.2uF Cb=0.1uF
Power Supply Rejection Ratio[dB]
70 60 ton[ms]
100 1k Frequency[Hz] 10k 100k
50 40 30 20 10 0
Cb=0.47uF Cb=1uF
-60 -70 10
0
0.5
1 Cb[uF]
1.5
2
2.5
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7/17
2010.06 - Rev.A
BD7830NUV
Technical Note
Cs This capacitor is for adjustment of the FADE IN/OUT times. The FADE IN/OUT functions soften the operation (IN and OUT) of BTL output when switching between standby and active modes. When a capacitor is connected to the SOFT pin (pin 3), the FADE IN/OUT functions are valid. When the capacitor rating is increased, the FADE IN/OUT effect is also increased, but note with caution when setting this that it also affects the activation time. If the FADE IN/OUT functions are not being used, connect the SOFT pin (pin 3) to VCC. Fade-in/out waveforms Standby Active Active Standby
STBY 2V/div Ton Toff BTL output 0.5V/div
Cs - Fade-in/out Time
Cs-ton,toff 140 120 ton,toff[ms] 100 ton 80 60 40 toff 20 0 0 0.02 0.04 Cs[uF] 0.06 0.08 0.1
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8/17
2010.06 - Rev.A
BD7830NUV
Ci This is a DC cut-off input coupling capacitor for the amp input pin. This includes an Ri and a high-pass filter. The cut-off frequency is calculated as follows. 1 [Hz] fCL = 2xRixCi Ci - Low Frequency Characteristics
Ci-Frequency characteristic
Technical Note
4 2 0 Gain [dB] -2 -4 -6 -8 -10 10 100 1k Frequency[Hz] 10k 100k
Ci:0.047uF Ci:0.1uF Ci:0.22uF
Capacitors of a certain size are required for coupling without attenuation of low frequencies, but in most cases of speakers used in portable equipment, it is nearly impossible to reproduce signals in the 100 to 200 Hz range or below. Even when a larger capacitor is used instead, it may not improve system performance. Also, pop sounds can affect the capacitance (Ci) of the capacitor. A larger coupling capacitor requires a greater charge to reach the bias DC voltage (normally 1/2 VCC). Because this charge current is supplied from the output due to routing of feedback, pop sounds occur easily at startup. Consequently, pop sounds can be minimized by selecting the smallest capacitor that still has the required low-frequency response. Ri This is inverting input resistance, which sets the closed loop gain in conjunction with Rf. Rf This is feedback resistance, which sets closed loop gain in conjunction with Rf. The amp gain is set using the following formula. Gain = 20log Rf Ri [dB]
Cf This is a feedback capacitor, which is used to cut high frequencies. This includes Rf and a low-pass filter. The cut-off frequency is calculated as follows. fCL= 1 2xRixCi [Hz]
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9/17
2010.06 - Rev.A
BD7830NUV
Selection of external components
Technical Note
Setting gain from desired output Output Po is determined via the following formula, from which the required gain Av can also be obtained. 2 Po [W] = Vo [Vrms] / RL [] Vo = Av Vin Av PoRL / Vin Setting input resistance and feedback resistance from gain Gain Av is determined via the following formula, from which input resistance Rin and feedback resistance Rf can be set. Av = (Rf / Rin) 2 Rin is set with the input side's drive capacity taken into account. Setting input coupling capacitor from low-range cut-off frequency Low-range cut-off frequency fc is determined via the following formula, from which input coupling capacitor Cin can be set. fc [Hz] = 1 / (2 Rin Cin) Cin 1 / (2 Rin fc) Setting bias capacitor and SOFT capacitor to minimize pops It is recommended that the capacitance of the bias capacitor CB be set to at least 10 times that of the input coupling capacitor Cin, in order to soften the rise of the bias voltage while improving the Cin following ability. Also, when a higher gain is used, the capacitance of the SOFT capacitor Cs can be raised to control pop sounds. Av = 2 (6 dB at BTL) Cs (80 / fc) 0.01 F Av = 4 (12 dB at BTL) Cs (80 / fc) 0.022 F Av = 8 (18 dB at BTL) Cs (80 / fc) 0.033 F Av = 20 (26 dB at BTL) Cs (80 / fc) 0.068 F Use when VCC = STBY short Since this IC is designed on the assumption that it will be used to switch standby mode ON and OFF while the power supply remains ON, normally STBY should be switched from H to L and the SOFT voltage should be discharged before powering down. When used while VCC = STBY short, pop sounds may occur if the IC's power supply is reduced prior to discharging the SOFT voltage. To prevent pop sounds, you must set STBY = HL before setting VCC = HL, and forcibly discharge the SOFT voltage. A sample circuit in which VCC = STBY short is used is shown below. Sample circuit configuration when VCC = STBY short
STBY = H L at power-off
STBY 1 OUT2 8
BIAS 2
1
Bias 2nd Amp SOFT
GND 7
CD
Fast discharge of SOFT voltage at power-off
CS Cin Rin
SOFT 3
VCC 6 VCC
IN 4 1st Amp
OUT1 5
Slow power-off of IC itself
Rf
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10/17
2010.06 - Rev.A
BD7830NUV
Mechanism of pop sounds
Technical Note
Cin is low Gain is low (Rf)
STBY BIAS BIAS ININ-
About 25 SOFT 0.6 VCC
OUT
No pops
Cin is high Gain is high (Rf)
STBY BIAS BIAS ININ-
Potential difference
When SOFT voltage reaches 0.6 VCC, if there is a potential difference between BIAS and IN-, pop sounds will occur. At startup, the input coupling Cin is charged from output OUT via the feedback resistance Rf, so when Cin and Rf are high, charging takes longer and pop sounds can easily occur. The rise of the SOFT voltage is changed by CS, so pop sounds an be reduced by setting CS high.
About 25 ms SOFT 0.6 VCC
OUT
POP sounds
STBY 1
OUT2 8
BIAS 2
1
GND Bias 2nd Amp SOFT 7
1 RL
SOFT 3
CS Cin Ri
VCC 6 VCC
IN 4 1st Amp
OUT1 5
600
Rf
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11/17
2010.06 - Rev.A
BD7830NUV
Bass boost function External components can be added to this chip to provide a bass boost function.
Technical Note
BIAS INOUT
4
Ci Ri
5
Rfb
Rf Cfb
fC2
Gain GC1 GC2
1 2 Cfb Rf
[Hz]
Low frequency gain up
fC1 1 2 Cfb (Rf // Rfb )
Rf Rfb Ri Rf (normal use) Ri
[Hz]
GC1 20 log
[dB]
fC1
fC2
f
GC2 20 log
[dB]
Thermal shutdown function When the chip exceeds the Tjmax (150C) temperature by reaching a temperature of 180 or above, the protection function is activated. High impedance is for OUT1 and OUT2 during protected mode. Protection is canceled and normal operation is resumed when the chip's temperature falls to 120 or below.
Chip
180C 120C
Protection start temperature: 180C (typ) or more Protection cancels temperature: 120C (typ) or less
Output
Normal
Protected operation
Normal
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12/17
2010.06 - Rev.A
BD7830NUV
Technical Note
Thermal design of chip The characteristics of the IC vary greatly depending on the use temperature, and when the maximum allowable junction temperature is exceeded, components may deteriorate or become damaged. Thermal considerations are needed for this chip from two standpoints: preventing instantaneous damage and improving long-term reliability. Note the following points with caution. The absolute maximum ratings for each chip include the maximum junction temperature (TjMAX) and operating temperature rate (Topr), and these values should be referred to when using the Pd-Ta characteristics (thermal dissipation curve). Since the IC itself is designed with full consideration of thermal balance, there are no problems in terms of circuit operations, but even when a more-than-adequate thermal design is implemented in order to get full use of the IC's performance features, some moderation is often required for the sake of practical usage. If there is an excessive input signal due to insufficient thermal dissipation, a TSD (thermal shutdown) operation may occur. Thermal Dissipation Curve
Reference data
VSON008V2030
When mounted on ROHM standard 1-layer board Size: 70 mm x 70 mm x 1.6 mmt No copper heat sink (only mounting pattern)
1.0 0.85W
When mounted on 4-layer board Size: 76.2 mm x 76.2 mm x 1.6 mmt Layers 2 & 3 Copper foil No connection via thermal via
Allowable loss Pd (W) 0.53W 0.5
0 0 25 50 75 100 125 150
Ambient temperature Ta (C)
(Note) These are measured values. They are not guaranteed.
The allowable loss value varies depending on the type of board used for mounting. When this chip is mounted on a multi-layer board that is designed for thermal dissipation, the allowable loss becomes greater than shown in the above figure.
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13/17
2010.06 - Rev.A
BD7830NUV
Typical Characteristics (1)
BD7830NUV f-THD+N VCC=5V,Ta=25,Po=150mW,RL=8
Technical Note
BD7830NUV f-THD+N VCC=3V,Ta=25,Po=150mW,RL=8
10
10
THD+N[%]
THD+N[%]
1
1
0.1
0.1
0.01 10 100 1k 10k 100k
0.01 10 100 1k 10k 100k
f[Hz]
f[Hz]
BD7830NUV Po-THD Ta=25,f=1kHz,RL=8
10
10000
BD7830NUV VCC-Po Ta=25 f=1kHz 40030kBPF THD+N=1.0%
RL=4
1
VCC=3V
RL=8
THD[%]
Po[mW]
0.1 VCC=5V
1000
RL=16
0.01 0.01
100
0.1
1
10
2
3
4
5
6
Po[W]
Vcc[V]
BD7830NUV frequency characteristic VCC=5V,Ta=25,Vin=-20dBV,RL=8
10 5 10
BD7830NUV frequency characteristic VCC=3V,Ta=25,Vin=-20dBV,RL=8
5 0
Gain[dB]
0 -5 -10 -15 10 100 1k 10k 100k
Gain[dB]
-5 -10
-15 10 100 1k 10k 100k
f[Hz]
f[Hz]
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14/17
2010.06 - Rev.A
BD7830NUV
Typical Characteristics (2)
BD7830NUV f-PSRR Ta=25,VCC=5V, Vripple=200mVpp,30kLPF
0 Power Supply Rejection Ratio[dB] -10 -20 -30 -40 -50 -60 -70 10 100
Technical Note
BD7830NUV f-PSRR Ta=25, VCC=3V,Vripple=200mVpp,30kLPF
0 Power Supply Rejection Ratio [dB] -10 -20 -30 -40 -50 -60 -70 10
100
1k
10k
100k
f[Hz]
f[Hz]
1k
10k
100k
BD7830NUV Circuit current (ACT) Ta=25,RL=8
8
BD7830NUV Circuit current (STBY) Ta=25, RL=8
0.10 0.09
Circuit current (ACT)[A]
Circuit current (STBY)[A]
2 3 4 5 6
6
0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0.00 2 3 4 5 6
4
2
0
VCC[V]
VCC[V]
BD7830NUV Po-Pd
0.7 0.6
BD7830NUV RL-Po Ta=25, f=1kHz, THD+N=1%
10.00
VCC=5.5V
0.5 VCC=5V
1.00
VCC=3V
Pd[W]
0.4 0.3 0.2 0.1 0.0 0.0 0.5 1.0 1.5 VCC=3V
Po
0.10 VCC=2.4V 0.01 1 10 100
Po[W]
RL[]
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15/17
2010.06 - Rev.A
BD7830NUV
Notes for use 1) The above numerical values and data are typical values for the design, which are not guaranteed.
Technical Note
2) The application circuit examples can be reliably recommended, but their characteristics should be checked carefully before use. When using external component constants that have been modified, determine an ample margin that takes into consideration variation among the external components and Rohm's LSI IC chips, including variation in static characteristics and transient characteristics. 3) Absolute maximum ratings This IC may be damaged if the absolute maximum ratings for the applied voltage, temperature range, or other parameters are exceeded. Therefore, avoid using a voltage or temperature that exceeds the absolute maximum ratings. If it is possible that absolute maximum ratings will be exceeded, use fuses or other physical safety measures and determine ways to avoid exceeding the IC's absolute maximum ratings. The above numerical values and data are typical values for the design, which are not guaranteed. 4) GND pin's potential Try to set the minimum voltage for GND pin's potential, regardless of the operation mode. Check that the voltage of each pin does not go below GND pin's voltage, including transient phenomena. 5) Shorting between pins and mounting errors When mounting the IC chip on a board, be very careful to set the chip's orientation and position precisely. When the power is turned on, the IC may be damaged if it is not mounted correctly. The IC may also be damaged if a short occurs (due to a foreign object, etc.) between two pins, between a pin and the power supply, or between a pin and the GND. 6) Shorting output pin When output pin (5,8pin) is shorted to VCC or GND, the IC may be damaged by over current, so be careful in operation. 7) Thermal design Ensure sufficient margins to the thermal design by taking in to account the allowable power dissipation during actual use modes, because this IC is power amp. When excessive signal inputs which the heat dissipation is insufficient condition, it is possible that TSD (thermal shutdown circuit) is active. TSD is protection of the heat by excessive signal inputs, it is not protection of the shorting output to VCC or GND. 8) Shorted pins and mounting errors When the output pins (pins 5 and 8) are connected to VCC and GND, the thermal shutdown function repeatedly switches between shutdown (OFF) and cancel (ON). Note with caution that chip damage may occur if these connections remain for a long time. 9) Operating range The rated operating power supply voltage range(VCC=+2.4 +5.5V) and the rated operation temperature range (Ta=-40+85) are the range by which basic circuit functions is operated. It is not guaranteed a specification and a rated output power about all operating power supply voltage range or operation temperature range. 10) Operation in strong magnetic fields Note with caution that operation faults may occur when this IC operates in a strong magnetic field.
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16/17
2010.06 - Rev.A
BD7830NUV
Ordering part number
Technical Note
B
D
7
Part No.
8
3
0
N
U
V
-
T
R
Part No.
Package NUV:VSON008V2030
Packaging and forming specification TR: Embossed tape and reel
VSON008V2030
2.0*}0.1

Tape
3.0*}0.1
Embossed carrier tape 3000pcs TR
The direction is the 1pin of product is at the upper right when you hold
Quantity Direction of feed
1PIN MARK
1.0MAX
S
( reel on the left hand and you pull out the tape on the right hand
)
+0.03 0.02 -0.02 1.4*}0.1
0.08 S
C0.25
0.3*}0.1
1.5*}0.1 0.5
1 4
(0.22)
8
5
0.25
+0.05 0.25 -0.04
1pin (Unit : mm) Reel
Direction of feed
Order quantity needs to be multiple of the minimum quantity.
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17/17
2010.06 - Rev.A
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. The Products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products specified in this document are not designed to be radiation tolerant. While ROHM always makes efforts to enhance the quality and reliability of its Products, a Product may fail or malfunction for a variety of reasons. Please be sure to implement in your equipment using the Products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuelcontroller or other safety device). 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. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law.
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