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TECHNICAL NOTE
Speaker / Headphone Amplifier Series
1.1W to1.5W Monaural Speaker Amplifiers
BD7830NUV
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 4 at 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 electronic applications Absolute Maximum RatingsTa=+25 Parameter Supply voltage Power dissipation Storage temperature range Symbol Vcc Pd Tstg Ratings 6.0 530 *1 -55+150 Unit V mW V
Vstby -0.1Vcc+0.1 STBY input range *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 Range -40+85 +2.4+5.5
Unit V
This product is not designed for protection against radioactive rays.
Aug. 2008
Application Circuit Example
STBY 1 BIAS 2 VCC 1F 1 0.01uF Audio Input 0.1uF 2 SOFT 3 IN 4 20k 1stAmp 2ndAmp SOFT VDD 6 1F OUT1 5 8 OUT2 8 GND 7
H : ACTIVE L : STBY
Bias
20k
3pin SOFT terminal 1 Usually 2 Enable to adjust fade in/out time by external capacitor
Outer dimension
D78 30
Reference land pattern (adapt as necessary to suit conditions during actual design.)
Unit: mm Lead pitch e
L2
Land Gap MD1 2.20 Length L2 0.70 Width b2 0.27
PKG type
VSON008V2030
0.50
MD1
D3
PKG type
Central pad Length Width D3 E3 1.60
Thermal via Pitch Diameter 0.300
E3
VSON008V2030
1.20
This package is a non-lead type, so solderability of the lead ends and sides is not guaranteed.
Thermal via e b2
2/16
Electrical characteristics
(Unless otherwise noted, Ta=+25, Vcc=+3.0V, f=1kHz, RL=8) Limit MIN. 280 -1 -1 40 60 1.35 -40 1.4 -0.1 20 -2 TYP. 3.2 0 420 0.1 0 0 57 80 1.5 0 30 0 MAX. 6.8 2 0.5 +1 +1 1.65 +40 Vcc+0.1 0.4 40
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
Symbol ICC ISTBY PO THD+N AV1 AV2 PSRR MUTE Vo Vo VSTBYH VSTBYL ISTBYH ISTBYL
Unit mA uA mW % dB dB dB dB V mV V V uA uA
Monitor pin 6 6 5&8 5&8 5 8 5&8 5&8 5&8 5&8 1 1 1 1
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
*1B.W.40030kHz, *2DIN AUDIO, SESingle End, BTLThe voltage between 5pin and 8pin Measurement Circuit Diagram
VSTBY
STBY
OUT2
A
1
8
V
600 100 Vripple 8
BIAS
GND Bias 2nd Amp
2
1 VCC 1 2
7
SOFT
VCC SOFT
50
3
0.01 0.1 Vin 600 20k
6
A
IN OUT1
1
VCC
4
1st Amp
5
V
20k
3pin SOFT terminal 1 Usually 2 Enable to adjust fade in/out time by external capacitor
Block diagram
STBY OUT2 8
Pin assignment
1
PIN No.
BIAS GND Bias 2nd Amp SOFT 3 SOFT VCC 6
PIN Name STBY BIAS SOFT INOUT1 VCC GND OUT2
1 2 3 4 5 6 7 8
2
7
IN
4
1st Amp
OUT1 5
3/16
Input/output equivalent circuit PIN No. PIN Name PIN description Equivalent circuit
1
STBY
Active/Standby Control pin STBY=H Active STBY=L Standby
STBY
50k
1
100k
BIAS
25k
2
BIAS
Bias capacitor Connection pin
600k
100k
2
20k 1k 100k
SOFT
1k
3
Fade-in/out SOFT Adjustment pin
3
10k
IN-
1k 1k
4
IN-
Input pin
4
5 8
OUT1 Output pin OUT2
60k
OUT1 (OUT2)
5 (8)
6
VCC
Power supply pin
VCC
6 7
GND
7
GND
GND pin
)
The above numerical values are typical values for the design, which are not guaranteed. 4/16
Description of operations ON/OFF operation by STBY pin
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.
5/16
External components and cautions points Setting of external components
STBY STBY OUT2
1
8
SPEAKER
BIAS
GND
2
Cb SOFT
Bias 2ndAmp SOFT
7
1 VCC 8
3
Cs SP_IN Ci Ri IN
6
OUT1
4 1stAmp
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 - Turn-on Time
Cb-ton 80 70 60 ton[ms]
Cb-PSRR Vcc=3V, Vripple=200mVpp, RL=8
0 -10 -20 -30 -40 -50
Cb=2.2uF Cb=0.1uF
Power Supply Rejection Ratio[dB]
50 40 30 20 10 0 0 0.5 1 Cb[uF] 1.5 2 2.5
Cb=0.47uF Cb=1uF
-60 -70 10 100 1k Frequency[Hz] 10k 100k
6/16
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
7/16
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 2xRixCi
fcL =
[Hz]
Ci - Low Frequency Characteristics
Ci-Frequency characteristic
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. 1 2xRixCi
fcL =
[Hz]
8/16
Selection of external components 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
STBY
1
OUT2 8
power-off
BIAS
GND Bias 2nd Amp
2
1
7
CD
CS
SOFT 3
SOFT
VCC 6 VCC
Fast discharge of SOFT voltage at power-off
Cin Rin
IN
4
1st Amp
OUT1 5
Slow power-off of IC itself
Rf
9/16
Mechanism of pop sounds
Cin is low Gain is low (Rf)
STBY B IA S B IA S IN IN -
A b ou t 25 m s SO FT 0 .6 V C C
OUT
N o p o ps
Cin is high Gain is high (Rf)
STBY B IA S B IA S IN IN P o te n tia l d iffe re n c e
About 25 m s SOFT 0 .6 V C C
When SOFT voltage reaches 0.6 VCC, if there is a potential difference between BIAS and IN-, pop sounds will occur.
OUT
P O P so u n d s
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
STBY OUT2
easily occur.
1
8
BIAS
GND Bias 2nd Amp
2
1
7
1 RL
The rise of the SOFT voltage is changed by CS, so pop sounds an be reduced by setting CS high.
VCC
SOFT
VCC SOFT
3
CS Cin Ri
6
IN
OUT1
4
600
5
1st Amp
Rf
10/16
Bass boost function External components can be added to this chip to provide a bass boost function.
BIAS INOUT1
4
Ci Ri
5
Rfb
Rf Cfb
Gain GC1 GC2
Low frequency gain up
fC 2
1 2 Cfb Rf
[Hz]
fC1
1 2 Cfb (Rf // Rfb )
[Hz]
GC1 20 log
Rf Rfb Ri Rf (normal use) Ri
[dB]
f fC1 fC2
GC2 20 log
[dB]
11/16
Thermal shutdown function When the chip exceeds the Tjmax (150C) temperature by reaching a temperature of 180C 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 120C or below.
Chip temperature
180C 120C
Protection start temperature: 180C (typ) or more Protection cancel temperature: 120C (typ) or less
Output
Normal operation
Protected operation
Normal operation
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
1.0
0.85W
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) 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. 12/16
Cautions on use (1) The above numerical values and data are typical values for the design, which are not guaranteed. (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.
13/16
Typical Characteristics (1)
BD7830NUV f-THD+N VCC=5V,Ta=25,Po=150mW,RL=8
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]
14/16
Typical Characteristics (2)
0 Power Supply Rejection Ratio [dB] -10 -20 -30 -40 -50 -60 -70 10
BD7830NUV f-PSRR Ta=25,VCC=5V, Vripple=200mVpp,30kLPF
0 Power Supply Rejection Ratio[dB] -10 -20 -30 -40 -50 -60 -70 10
BD7830NUV f-PSRR Ta=25, VCC=3V,Vripple=200mVpp,30kLPF
100
1k
10k
100k
f[Hz]
100
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[]
15/16
Selection of order type
B
D
7
8
3
Part No.
0
N
U
V
T
R
Tape and Reel information
BD7830NUV
VSON008V2030

2.00.1
3.0 0.1

Tape Quantity Direction of feed Embossed carrier tape 4000pcs TR
(The direction is the 1pin of product is at the upper light when you hold reel on the left hand and you pull out the tape on the right hand)
1PIN MARK
1.0MAX
S
0.08 S
1.50.1 C0.25
1
0.5
4
0.3 0.1
1.4 0.1
0.02 -0.02 (0.22)
+0.03
8
5
0.25
0.25 -0.04
+0.05
(Unit:mm)
1Pin
Direction of feed
Reel When you order , please order in times the amount of package quantity.
Catalog No.08T300A '08.8 ROHM (c)
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product described in this document are for reference only. Upon actual use, therefore, please request that specifications to be separately delivered. Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. Any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer. Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of which would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. It is our top priority to supply products with the utmost quality and reliability. However, there is always a chance of failure due to unexpected factors. Therefore, please take into account the derating characteristics and allow for sufficient safety features, such as extra margin, anti-flammability, and fail-safe measures when designing in order to prevent possible accidents that may result in bodily harm or fire caused by component failure. ROHM cannot be held responsible for any damages arising from the use of the products under conditions out of the range of the specifications or due to non-compliance with the NOTES specified in this catalog.
Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact your nearest sales office.
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