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FAN7040
3W Mono BTL Amplifier with DC Volume Control
Features
* * * * * * * * * * DC Volume Control : +37dB ~ -52dB Few External Components Mute Mode Thermal Protection Short-Circuit Proof No Switch-On or Switch-Off Clicks Good Overall Stability Low Power Consumption Low HF Radiation ESD Protected On All Pins
Description
The FAN7040 is a mono Bridge-Tied Load(BTL) output amplifier with DC volume control. It is designed for use in TVs and monitors, but is also suitable for battery-fed portable recorders and radios. The device is contained in a 20-lead small outline package. A Missing Current Limiter(MCL) is built in. the MCL circuit is activated when the difference in current between the output terminal of each amplifier exceeds 130mA. This level of 130mA allows for Single-Ended(SE) headphone applications.
20SOP
Applications
* * * * TVs and Monitors Portable Computers Desktop computers Low Voltage Audio Systems
1
Internal Block Diagram
VCC
4
FAN7040
IN
5
Power Amp
14
OUT+
VGA
17
OUT-
VC
7
Missing current protection DC Gain Bandgap Control Reference Over-Temperature Protection
1-3, 8-13, 16, 18 and 20 6
Power Amp
15
NC
SGND
PGND
Rev. 1.1.0
(c)2004 Fairchild Semiconductor Corporation
FAN7040
Pin Assignments
1
20
FAN7040
10
11
Pin Description
Pin No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Symbol N.C. N.C. N.C. VCC IN SGND VC N.C. N.C. N.C. N.C. N.C. N.C. OUT+ PGND N.C. OUTN.C. N.C. N.C. O O I I I I/O No Connection No Connection No Connection Positive Power Supply Signal Input Signal Ground DC Volume Control No Connection No Connection No Connection No Connection No Connection No Connection Positive Output Power Ground No Connection Negative Output No Connection No Connection No Connection Description
2
FAN7040
Absolute Maximum Ratings
Parameter Maximum Supply Voltage Maximum Input Voltage Repetitive Peak Output Current Non-repetitive Peak Output Current Power Dissipation Storage Temperature Junction Temperature Thermal Resistance Symbol VCCmax VPIN5, VPIN7 IORM IOSM PD TSTG TJ
Rthj-a
Value 18 5.0 1.25 1.5 Internally Limited -55 ~ +150 150 70
Unit V V A A W C C C/W
Remark
Operating Ratings
Parameter Power Supply Voltage Operating Temperature Symbol VCC TOPG Min 4.5 -40 Typ Max 18 +85 Unit V C
3
FAN7040
Electrical Characteristics
(VCC = 12V, Ta = 25C, RL=16, unless otherwise specified) Parameter Supply Current Maximum Gain(VC=2V) Note 2 Output Power Total Harmonic Distortion Maximum Total Voltage Gain Input Signal Handling(RMS) Noise Output Voltage Power Supply Rejection Ratio DC Output Offset Voltage Input Impedance(pin3) Minimum Gain(VC=0.5V) Minimum Total Voltage Gain Noise Output Voltage Mute Position Output Voltage in Mute Position DC Volume Control Voltage Gain Control Range Control Current GV IVC |GV,max|+|GV,min| VC=0V 50 89 62 75 dB A Vo,mute VC=0.3V, VI=600mVrms, f=1kHz 1 V GV,min Vn(o) f=1kHz, Rs=0 -65 -52 1 -40 dB V PO THD GV,max Vi,rms Vn(o) PSRR VOS ZI VC=0.8V, THD<1% f=1kHz, Rs=0 Vripple=200mV, Rs=0, f=1kHz |(OUT+)-(OUT-)|, VC=1.4V THD+N =10%, RL=16 PO = 0.5W 3 34 0.6 30 15 3.5 0.3 37 0.7 15 20 1 210 25 W % dB Vrms V dB mV k Symbol ICC Conditions Vi=0V, No Load note1 Min. Typ. 5 Max. 10 Unit mA
Notes 1. With a load connected to the outputs, the quiescent current will increase as much as the DC output offset voltage divided by RL. 2. The maximum gain of the amplifier is normally reached at VC=1.4V typical.
.
4
FAN7040
Performance Characteristics
7.0m 6.0m 5.0m 4.0m 3.0m 2.0m 1.0m 0.0 VCC=12V VC=2V No load
-20 -30 -40 -50 -60 -70 -80 -90 +0 -10
VC=2V, Rs=5k VC=2V, Rs=0
Supply Current [A]
PSRR [dB]
VC=0.5V, Rs=5k
0
4
8 12 Supply Voltage [V]
16
20
-100 20 50 100 200 500 1k 2k 5k 10k 20k 50k 100k
Fig. 1 Supply Current
Frequency [Hz]
Fig. 2 Power Supply Rejection Ratio
30 20 10 5
10 5
2
VCC=12V VC=2V f=1kHz RL=16 BW<22kHz
2 1
THD+N [%]
1 0.5
THD+N [%]
0.5
0.2 0.1
0.2 0.1
0.05
0.05
VCC=12V VC=2V RL=16 BW<80kHz
0.02 0.01 10m
0.02
20m
50m
100m
200m
500m
1
2
5
10
0.01 20
50
100
200
500
1k
2k
5k
10k
20k
Output Power [W]
Frequency [Hz]
Fig. 3 THD+N vs. Output Power
Fig. 4 THD+N vs. Frequency
1.0
40 20 0 Gain [dB] -20 -40 -60 -80 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 VCC=12V
0.9 Input Voltage [Vrms] 0.8 0.7 0.6 0.5 0.4 0.3
VCC=12V VC=0.8V RL=16 THD+N=1%
2
4
6
8
10
12
14
16
18
20
DC Volume Control Voltage [V]
Power Supply [V]
Fig. 5 Gain vs. DC Volume Control
Fig. 6 Input Signal Handling
5
FAN7040
Performance Characteristics(continued)
60 40 VCC=12V 20 Current I [A] 0 -20 -40 -60 -80
0 Power Dissipation [W] 2 VCC=12V f=1kHz THD+N <1% RL=8 RL=16 RL=25 3
1
0.0
0.4
0.8
1.2
1.6
2.0
0
4
8
12
16
20
DC Volume Control Voltage[V]
Power Supply [V]
Fig. 7 Control Current vs. DC Volume Control
Fig. 8 Power Dissipation vs Supply Voltage
3
Power Dissipation [W]
Power Dissipation [W]
VCC=12V f=1kHz THD+N <10% 2
RL=8
RL=16
RL=25
1
0
0
4
8
12
16
20
3.0 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0.0
RL=8
VCC=12V VC=2V THD+N < 1% RL=16
RL=25
0.5
1.0
1.5 Output Power [W]
2.0
2.5
3.0
Power Supply [V]
Fig. 9 Power Dissipation vs. Supply Voltage
Fig. 10 Power Dissipation vs. Output Power
6 f=1kHz BW<22KHz 1% THD+N Output Power [W] 4 RL=16 Output Power [W] RL=25
8 7 6 5 4 3 2 RL=8 f=1kHz BW<22KHz 10% THD+N RL=25 RL=16
5
3
RL=8
2
1
1 0
0
2
4
6
8
10
12
14
16
18
20
2
4
6
8
10
12
14
16
18
20
Power Supply [VCC]
Power Supply [VCC]
Fig. 11 Output Power vs. Supply Voltage
Fig. 12 Output Power vs. Supply Voltage
6
FAN7040
Performance Characteristics(continued)
100u 50u
10u
VC=2V
20u 10u
5u
2u
VCC=12V VC=0.3V Vin=600mV
Output Voltage [V]
5u
VCC=12V RL=16 VC=0.5V
Output Voltage [V]
1u
2u 1u 500n
500n
200n
200n 100n
100n
40n 20 50 100 200 500 1k 2k 5k 10k 20k
40n 20 50 100 200 500 1k 2k 5k 10k 20k
Frequency [Hz]
Frequency [Hz]
Fig. 15 Output Noise Voltage
Fig. 14 Output Voltage in Mute State
2.0 1.8 1.6 1.4
P
DMAX
=1.79W
Power Dissipation [W]
1.2 1.0 0.8 0.6 0.4 0.2 0.0 0 25 50 75 100
O
125
150
Ambient Temperature [
C]
Fig. 15 Power Derating Curve
7
FAN7040
Typical Application Circuit
VCC 100nF 220F 82k VCC
4
FAN7040
5
Power Amp
14
Signal Input Vi RS 5k
0.47F
OUT+
IN
VGA
17
OUT-
RL=16
VC 100nF 22k
7
Missing current protection DC Gain Bandgap Control Reference Over-Temperature Protection
1-3, 8-13, 16, 18 and 20 6
Power Amp
15
NC
SGND
PGND
8
FAN7040
Typical Application Information
Functional Description
The FAN7040 is a mono BTL output amplifier with DC volume control. It is designed for use in TVs and monitors but is also suitable for battery-fed portable recorders and radios. In conventional DC volume circuits the control or input stage is AC-coupled to the output stage via external capacitors to keep the offset voltage low. In the FAN7040 the DC volume control stage is integrated into the input stage so that no coupling capacitors are required. With this configuration, a low offset voltage is still maintained and the minimum supply voltage remains low. The BTL principle offers the following advantages: *Lower peak value of the supply current *The frequency of the ripple on the supply voltage is twice the signal frequency. Consequently, a reduced power supply with smaller capacitors can be used which also results in cost reductions. For portable applications there is a trend to decrease the supply voltage, resulting in a reduction of output power at conventional output stages. Using the BTL principle increases the output power. The maximum gain of the amplifier is fixed at 37dB. The DC volume control stage has a logarithmic control characteristic. The total gain can be controlled from 37dB to -52dB. If the DC volume control voltage is below 0.3V, the device switches to the mute mode. The amplifier is short-circuit proof to ground, Vcc and across the load. A thermal protection circuit is also implemented. If the crystal temperature rises above +150C the TSD is operated, thereby the output power is off. Special attention is given to switch-on and switch-off clicks, low HF radiation and a good overall stability.
Voltage Gain
The maximum closed-loop voltage gain has been internally fixed at 37dB.
Output Power
The output power as a function of supply voltage has been measured at THD=10%. The maximum output power is limited by the maximum allowed power dissipation at Ta=25C approximately 1.8W, and the maximum available output current is 1.25A repetitive peak current.
Short Circuit Protection
The output (pins 14 and 17) can be short-circuited to ground respectively to +VDD. The Missing Current Limiter(MCL) protection circuit will shut-off the amplifier. Removing the short-circuit will reset the amplifier automatically. Short-circuit across the load(pins 14 and 17) will activate the thermal protection circuit; this will result in thermal shutdown protection. For single-end application the output peak current may not exceed 130mA; at higher output currents the short circuit protection(MCL) will be activated.
Power Dissipation
Power dissipation is a major concern when designing any power amplifier and must be thoroughly understood to ensure a successful design. Equation (1) states the maximum power dissipation point for a bridged amplifier operating at a given supply voltage and driving a specified output load.
P DMAX
V CC = 4 ---------------2 2 R L
2
(1)
Since the FAN7040 is driving a bridged amplifier, the internal maximum power dissipation point of the FAN7040 results from equation (1). Even with the large internal power dissipation, the FAN7040 does not require heat sinking over a wide range of ambient temperature. From equation (1), assuming a 12V power supply and a 16 load, the maximum power dissipation point is 1.8W. The maximum power dissipation point obtained from equation (1) must not be greater than the power dissipation that results from equation (2) :
( T JMAX - T A ) P DMAX = --------------------------------R thja
(2)
For package 20SOP, Rthja=70C/W, TJMAX=150C for the FAN7040. 9
FAN7040
Mechanical Dimensions
Package Dimensions in millimeters/inches
20SOP
10
FAN7040
Ordering Information
Device FAN7040M FAN7040MX Package 20SOP Operating Temperature -40C ~ +85C Remarks Tube Tape & Reel
11
FAN7040
DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.
www.fairchildsemi.com 6/30/04 0.0m 001 Stock#DSxxxxxxxx 2004 Fairchild Semiconductor Corporation
2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

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