TS4962M_07 STMICROELECTRONICS [STMicroelectronics], TS4962M_07 Datasheet

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TS4962M_07

Manufacturer Part Number
TS4962M_07
Description
3W filter-free class D audio power amplifier
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
Features
Description
The TS4962M is a differential Class-D BTL power
amplifier. It is able to drive up to 2.3W into a 4Ω
load and 1.4W into a 8Ω load at 5V. It achieves
outstanding efficiency (88%typ.) compared to
classical Class-AB audio amps.
The gain of the device can be controlled via two
external gain-setting resistors. Pop & click
reduction circuitry provides low on/off switch noise
while allowing the device to start within 5ms. A
standby function (active low) allows the reduction
of current consumption to 10nA typ.
January 2007
Operating from V
Standby mode active low
Output power: 3W into 4Ω and 1.75W into 8Ω
with 10% THD+N max and 5V power supply.
Output power: 2.3W @5V or 0.75W @ 3.0V
into 4Ω with 1% THD+N max.
Output power: 1.4W @5V or 0.45W @ 3.0V
into 8Ω with 1% THD+N max.
Adjustable gain via external resistors
Low current consumption 2mA @ 3V
Efficiency: 88% typ.
Signal to noise ratio: 85dB typ.
PSRR: 63dB typ. @217Hz with 6dB gain
PWM base frequency: 250kHz
Low pop & click noise
Thermal shutdown protection
Available in flip-chip 9 x 300μm (Pb-free)
CC
= 2.4V to 5.5V
3W filter-free class D audio power amplifier
Rev 4
Applications
Cellular phone
PDA
Notebook PC
C2
C1
A1
IN+: positive differential input
IN-: negative differential input
VDD: analog power supply
GND: power supply ground
STBY: standby pin (active low)
OUT+: positive differential output
OUT-: negative differential output
Stdby
In-
In+
1/A1
1/A1
4/B1
4/B1
V
V
7/C1
7/C1
IN
IN
IN
IN
+
-
DD
DD
Pin connections
150k
150k
+
+
-
-
Block diagram
Oscillator
Internal
Bias
GND
GND
STBY
STBY
2/A2
2/A2
V
V
5/B2
5/B2
8/C2
8/C2
PWM
DD
DD
B1
A2
Output
Bridge
OUT
OUT
Vcc
GND
GND
GND
OUT
OUT
TS4962M
H
3/A3
3/A3
6/B3
6/B3
9/C3
9/C3
Out+
Out-
-
-
B2
+
+
B3
C3
A3
www.st.com
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TS4962M_07 Summary of contents

Page 1

Features ■ Operating from V = 2.4V to 5.5V CC ■ Standby mode active low ■ Output power: 3W into 4Ω and 1.75W into 8Ω with 10% THD+N max and 5V power supply. ■ Output power: 2.3W @5V or 0.75W ...

Page 2

Contents Contents 1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 3

TS4962M 1 Absolute maximum ratings Table 1. Absolute maximum ratings Symbol V Supply voltage CC V Input voltage in T Operating free-air temperature range oper T Storage temperature stg T Maximum junction temperature j R Thermal resistance junction to ambient ...

Page 4

Application component information 2 Application component information Table 3. Component information Component Input capacitor Figure 1. Typical application schematics Vcc In+ GND GND + Differential Input - In- Input capacitors are optional GND Vcc In+ GND ...

Page 5

TS4962M 3 Electrical characteristics Table +5V, GND = 0V Symbol Parameter I Supply current CC (1) I Standby current STBY V Output offset voltage OO P Output power out Total harmonic THD + N distortion ...

Page 6

Electrical characteristics Table +5V, GND = 0V Symbol Parameter V Output voltage noise N 1. Standby mode is active when V STBY 2. Dynamic measurements - 20*log(rms(V 6/41 = 2.5V 25°C (unless otherwise ...

Page 7

TS4962M Table +4.2V, GND = 0V Symbol Parameter I Supply current CC (2) I Standby current STBY V Output offset voltage OO P Output power out Total harmonic THD + N distortion + noise Efficiency ...

Page 8

Electrical characteristics Table +4.2V, GND = 0V Symbol Parameter V Output voltage noise N 1. All electrical values are guaranteed with correlation measurements at 2.5V and 5V. 2. Standby mode is active when V STBY ...

Page 9

TS4962M Table +3.6V, GND = 0V Symbol Parameter I Supply current CC (2) I Standby current STBY V Output offset voltage OO P Output power out Total harmonic THD + N distortion + noise Efficiency ...

Page 10

Electrical characteristics Table +3.6V, GND = 0V Symbol Parameter V Output voltage noise N 1. All electrical values are guaranteed with correlation measurements at 2.5V and 5V. 2. Standby mode is active when V STBY ...

Page 11

TS4962M Table +3V, GND = 0V Symbol Parameter I Supply current CC (2) I Standby current STBY V Output offset voltage OO P Output power out Total harmonic THD + N distortion + noise Efficiency ...

Page 12

Electrical characteristics Table +3V, GND = 0V Symbol Parameter V Output Voltage Noise N 1. All electrical values are guaranteed with correlation measurements at 2.5V and 5V. 2. Standby mode is active when V STBY ...

Page 13

TS4962M Table +2.5V, GND = 0V Symbol Parameter I Supply current CC (1) I Standby current STBY V Output offset voltage OO P Output power out Total harmonic THD + N distortion + noise Efficiency ...

Page 14

Electrical characteristics Table +2.5V, GND = 0V Symbol Parameter V Output Voltage Noise N 1. Standby mode is active when V STBY 2. Dynamic measurements - 20*log(rms(V 14/41 = 2.5V 25°C (unless otherwise ...

Page 15

TS4962M Table +2.4V, GND = 0V Symbol Parameter I Supply current CC (1) I Standby current STBY V Output offset voltage OO P Output power out Total harmonic THD + N distortion + noise Efficiency ...

Page 16

Electrical characteristic curves 4 Electrical characteristic curves The graphs included in this section use the following abbreviations: ● 15μH or 30μH = pure resistor + very low series resistance inductor L ● Filter = LC output filter (1µF+30µH ...

Page 17

TS4962M Figure 4. Current consumption vs. power supply voltage 2.5 No load Tamb=25 ° C 2.0 1.5 1.0 0.5 0 Power Supply Voltage (V) Figure 6. Current consumption vs. standby voltage 2.0 1.5 1.0 0.5 0.0 0.0 ...

Page 18

Electrical characteristic curves Figure 10. Efficiency vs. output power 100 80 Efficiency 60 40 Power Dissipation 20 0 0.0 0.2 0.4 0.6 0.8 Output Power (W) Figure 12. Output power vs. power supply voltage 3 Ω + ...

Page 19

TS4962M Figure 16. PSRR vs. frequency 0 Vripple = 200mVpp -10 Inputs = Grounded G = 6dB, Cin = 4.7 μ Ω + Filter Δ R/R ≤ 0.1% -30 Tamb = 25 ° C -40 ...

Page 20

Electrical characteristic curves Figure 22. CMRR vs. frequency 0 RL=4 Ω μ H G=6dB Δ Vicm=200mVpp Δ R/R ≤ 0.1% -20 Cin=4.7 μ F Tamb = 25 ° C -40 Vcc=5V, 3.6V, 2.5V -60 20 100 1000 Frequency ...

Page 21

TS4962M Figure 28. THD+N vs. output power Ω μ 100Hz Vcc=3. 6dB BW < 30kHz Vcc=2.5V Tamb = 25 ° 0.1 1E-3 0.01 0.1 Output Power (W) ...

Page 22

Electrical characteristic curves Figure 34. THD+N vs. output power Ω μ 1kHz G = 6dB BW < 30kHz Vcc=3.6V Tamb = 25 ° C Vcc=2.5V 1 0.1 1E-3 0.01 Output Power ...

Page 23

TS4962M Figure 40. THD+N vs. frequency 10 RL=4 Ω μ H G=6dB Bw < 30kHz Po=0.4W Vcc=2.5V Tamb = 25 ° 0.1 200 1000 Frequency (Hz) Figure 42. THD+N vs. frequency 10 RL=8 Ω ...

Page 24

Electrical characteristic curves Figure 46. THD+N vs. frequency 10 RL=8 Ω μ H G=6dB Bw < 30kHz Vcc=2.5V Po=0.2W 1 Tamb = 25 ° C 0.1 Po=0.1W 0.01 50 100 1000 Frequency (Hz) Figure 48. Gain vs. frequency ...

Page 25

TS4962M Figure 52. Gain vs. frequency 8 6 Vcc=5V, 3.6V, 2.5V 4 RL=8 Ω μ H G=6dB 2 Vin=500mVpp Cin=1 μ F Tamb = 25 ° 100 1000 Frequency (Hz) Figure 54. Gain vs. frequency ...

Page 26

Electrical characteristic curves Figure 56. Startup & shutdown time 6dB (5ms/div) Vo1 Vo2 Standby Vo1-Vo2 Figure 58. Startup & shutdown time 6dB (5ms/div) Vo1 Vo2 Standby ...

Page 27

TS4962M Figure 60. Startup & shutdown time V CC Vo1 Vo2 Standby = 3V 6dB (5ms/div) in Vo1-Vo2 Electrical characteristic curves 27/41 ...

Page 28

Application information 5 Application information 5.1 Differential configuration principle The TS4962M is a monolithic fully-differential input/output class D power amplifier. The TS4962M also includes a common-mode feedback loop that controls the output bias value to average always ...

Page 29

TS4962M 5.3 Common mode feedback loop limitations As explained previously, the common mode feedback loop allows the output DC bias voltage to be averaged at V However, due to V page 3), the common mode feedback loop can ensure its ...

Page 30

Application information 5.5 Decoupling of the circuit A power supply capacitor, referred The TS4962M has a typical switching frequency at 250kHz and output fall and rise time about 5ns. Due to these very fast transients, careful decoupling ...

Page 31

TS4962M Figure 61. Single-ended input typical application Ve GND GND All formulas are identical except for the gain (with R And, due to the internal resistor tolerance we have: In the event that multiple single-ended inputs are summed ...

Page 32

Application information We have the following equations: In general, for mixed situations (single-ended and differential inputs best to use the same rule, that is, to equalize impedance on both TS4962M inputs. 5.10 Output filter considerations The TS4962M is ...

Page 33

TS4962M In the case where the distance between the TS4962M outputs and speaker terminals is high possible to have low frequency EMI issues due to the fact that the typical operating frequency is 250kHz. In this configuration, we ...

Page 34

Application information Example 2: One differential input plus one single-ended input Figure 65. Typical application schematic with one differential input plus one single- ended input With (R in kΩ): i 34/41 Standby Stdby C2 Internal R2 Bias E2+ 150k R1 ...

Page 35

TS4962M 6 Demoboard A demoboard for the TS4962M is available with a flip-chip to DIP adapter. For more information about this demoboard, refer to Application Note AN2134. Figure 66. Schematic diagram of mono class D demoboard for TS4962M Positive Input ...

Page 36

Demoboard Figure 68. Top view Figure 69. Bottom layer Figure 70. Top layer 36/41 TS4962M ...

Page 37

TS4962M 7 Footprint recommendations Figure 71. Footprint recommendations Non Solder mask opening Non Solder mask opening 500μm 500μm Φ=250μm Φ=250μm Φ=400μm typ. Φ=400μm typ. Φ=340μm min. Φ=340μm min. Pad in Cu 18μm with Flash NiAu (2-6μm, 0.2μm max.) Pad in ...

Page 38

Package information 8 Package information In order to meet environmental requirements, STMicroelectronics offers these devices in ® ECOPACK packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on ...

Page 39

TS4962M 9 Ordering information Table 10. Order codes Part number TS4962MEIJT Temperature Package range -40°C to +85°C Lead-free flip-chip Ordering information Packing Marking Tape & reel 62 39/41 ...

Page 40

Revision history 10 Revision history Date Oct. 2005 Nov. 2005 Dec. 2005 10-Jan-2007 40/41 Revision 1 First release corresponding to the product preview version. Electrical data updated for output voltage noise, see Table 6, Table 7, Table 8 andTable 9 ...

Page 41

TS4962M Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at ...

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