TB2905HQ TOSHIBA Bi-CMOS Digital Integrated Circuit Silicon Monolithic TB2905HQ Class KB High-Efficiency, Low-Frequency Power Amplifier IC Maximum Power: 47 W × 4 Channels The TB2905HQ is a high-efficiency class KB power amplifier IC developed for car audio applications that incorporates four BTL amplifier channels. It employs a pure complementary DMOS output stage consisting of P-ch upper and N-ch lower sections, offering a maximum output power (POUT) of 47 W. Class KB (keyed BTL) amplifiers exhibit less than half the heat generation of comparable class AB solutions under normal operating conditions. Therefore, it is possible to design a smaller Weight: 7.7 g (typ.) heatsink and maintain lower internal temperature in the car audio sets. Additionally, the TB2905HQ has many built-in functions for car audio, such as standby switching, muting, protective circuits, and self diagnosis. Features • High output power : POUT MAX (1) = 47 W (typ.) (VCC = 14.4 V, f = 1 kHz, JEITA max, RL = 4 Ω) : POUT MAX (2) = 43 W (typ.) (VCC = 13.7 V, f = 1 kHz, JEITA max, RL = 4 Ω) : POUT Pout MAX (3) = 80 W (typ.) (VCC = 14.4V, f = 1 kHz, JEITA max, RL = 2 Ω) : POUT (1) = 29 W (typ.) (VCC = 14.4 V, f = 1 kHz, THD = 10%, RL = 4 Ω) : POUT (2) = 25 W (typ.) (VCC = 13.2 V, f = 1 kHz, THD = 10%, RL = 4 Ω) : POUT (3) = 55 W (typ.) (VCC = 14.4 V, f = 1 kHz, THD = 10%,RL = 2 Ω) • Low distortion ratio : THD = 0.03% (typ.) (VCC = 13.2 V, f = 1 kHz, GV = 26dB, POUT = 2 W, RL = 4 Ω) • Low noise : VNO = 120 µVrms (typ.) (VCC = 13.2 V, GV = 26dB, Rg = 0 Ω, BW = 20 Hz~20 kHz, RL = 4 Ω) • Built-in standby (pin 4) and muting (pin22) functions • Built-in offset/clipping detection (pin 25) • Protective circuits: Thermal shutdown, overvoltage, out to GND, out to VCC, out to out short • Operating supply voltage: VCC (opr) = 9 to 18 V (RL = 4 Ω) Note 1: Some pins of this product are sensitive to electrostatic discharge. When handling this product, ensure that the environment is protected against electrostatic discharge. Note 2: Install the product correctly. Otherwise, the product or connected equipment may get damaged or degrade. Note 3: These protective features are intended to temporarily prevent an output short circuit or other abnormal conditions from occurring. Toshiba does not guarantee that they prevent the IC from being damaged. If the product is operating outside any of the guaranteed operating ranges, these protective features may not operate and an output short circuit may result in the IC being damaged. 1 2005-08-17 TB2905HQ Block Diagram 1 TAB 6 VCC2 20 VCC1 OUT1 (+) C1 11 RL = 4 ohm PW-GND1 8 OUT2 (+) 12 9 IN1 OUT1 (−) C1 C3 10 Ripple C5 C2 +B 7 5 IN2 RL = 4 ohm PW-GND2 2 OUT2 (−) 3 STBY 4 OUT3 (+) C1 15 17 IN3 RL = 4 ohm PW-GND3 18 OUT3 (−) 19 13 OUT4 (+) C1 14 RL = 4 ohm PW-GND4 24 OUT4 (−) MUTE C6 21 IN4 23 22 R1 16 AC-GND Offset/Clip Det 25 LPF Some of the functional blocks, circuits, or constants in the block diagram may be omitted or simplified for explanatory purpose. 2 2005-08-17 TB2905HQ Operational Description (Each description applies to a single channel) 1. Voltage Gain The TB2905HQ has no NF (negative feedback) pins. Therefore, the voltage gain (GV) is determined within the IC. Amplifier 2A Amplifier 1 Input Amplifier 2B Figure 1 Amplifier Configuration Voltage gain of amplifier 1: GV1 = 0 dB Voltage gain of amplifiers 2A and 2B: GV2 = 20 dB Voltage gain obtained by BTL connection: GV (BTL) = 6 dB Therefore, the total voltage gain is determined by the following expression: GV = GV1 + GV2 + GV (BTL) = 0 + 20 + 6 = 26dB Although this configuration without an NF pin does not allow the user to adjust voltage gain, it eliminates the need for an NF capacitor, resulting in lower total application cost and smaller mounting space. 2. Standby Switching Function (Pin 4) The TB2905HQ can be powered up or down by controlling the state of pin 4 (standby pin). The threshold voltage for pin 4 is approximately 3 VBE (typ.). The supply current in standby state is approximately 2 µA (typ.). VCC ON Power 4 10 kΩ OFF ≈ 2 VBE To bias cutoff circuit Pin 4 control voltage: VSB Stand-by Power VSB (V) ON OFF 0~0.5 OFF ON 2.5~6 V Figure 2 Driving pin 4 high powers up the TB2905HQ When changing the time constant for pin 4, check the pop noise produced. < Advantages of standby switching > (1) (2) The microcontroller can directly turn VCC on or off without using a switching relay. Since the control current is microscopic, a switching relay with small current capacity is satisfactory for switching. 3 2005-08-17 TB2905HQ Relay Large-current capacity switch Battery Battery VCC VCC From microcontroller - Conventional method - Small-current capacity switch Battery From microcontroller Battery Stand-By VCC Stand-By VCC - Standby switching - Figure 3 Standby switching 3. Muting Function (Pin 22) Driving pin 22 low triggers audio muting. The time constant for muting is determined from R1 and C4. Select the constants considering the pop noise that is produced when powering the TB2905HQ on/off or turning muting on/off. (See Figures 4 and 5.) Pin 22 is designed to be controlled at 3.3 V. The pin functions as a current source switch for the internal muting circuit and is designed so that its discharging current is 200 µA. The value of the external pull-up resistor is based on this current. Example: When changing the control voltage from 3.3 V to 5 V, 5 V/3.3 V x 47 kΩ = 71 kΩ The TB2905HQ internally triggers muting when the voltage is dropped, taking in a current of 200 µA. It cannot take in the current if the pull-up resistance is too low. The series resistance (R1) for pin 22 must, therefore, be at least 47 kΩ. ATT – VMUTE Muting attenuation ATT (dB) 20 3.3Ｖ R1 22 C4 1 kΩ Muting ON/OFF control Vcc = 13.2 V f = 1kHz 0 RL = 4 Ω VOUT = 20dBm −20 −40 −60 −80 −100 −120 0 0.5 1 1.5 2 Muting pin voltage: VMUTE Figure 4 Muting function Figure 5 4 2.5 3 (V) Muting attenuation − VMUTE (V) 2005-08-17 TB2905HQ 4. Offset Detection Function Pin 25 can be used to detect an offset voltage that may appear on an output pin due to input capacitor leakage or other reasons. V Output DC voltage (+) (for RS1) VCC/2 (normal DC voltage) Capacitor leakage or short-circuit Vref RS1 Vref/2 Output offset voltage (upon input capacitor leakage or short-circuit) RS2 Electrical volume Output DC voltage (−) (for RS2) + 5V − Vbias 25 A Figure 6 L.P.F. smoothing circuit B To microcontroller The microcontroller shuts down the system if the output is lower than the specified voltage. Example application and detection mechanism Offset detection threshold (RS1 detection) VCC/2 (normal DC voltage) Offset detection threshold (RS2 detection) Output DC voltage (+) GND Time Voltage at point A (output of pin 25) GND Time Voltage at point B (LPF output) GND Time RS2 5 2005-08-17 TB2905HQ 5. Output Clipping Detection Function (Pin 25) Pin 25 has open-collector output (active low) structure, as shown in Figure 7. If the output waveform is clipped, the clipping detection circuit in the IC activates and turns the Q1 NPN transistor on. The microcontroller can use this signal to control the volume and tone control circuits, thus improving sound quality. Pin 25 should be left open when this function is not used. (Example application) 5V Q1 Output clipping detector 25 Volume control circuit L.P.F. smoothing circuit Tone control circuit Pin 25: Open-collector output (active low) AC (A) Output AC waveform (A) Clipped level t DC Clipped level (B) Clipping detection circuit (B) t DC (C) Clipping detection pin (output of pin 25) (C) 5V t GND Figure 8 Clipping detection mechanism 6 2005-08-17 TB2905HQ 6. Pop Noise Suppression The TB2905HQ uses AC-GND as a common NF pin for all amplifiers, thus requiring that the ratio of input capacitance C1 to AC-GND capacitance C6 be 1:4. Powering up the IC initiates the charging of C1 and C6. If the IC is turned off before the charging of C1 and C6 completes, the input DC balance becomes unbalanced, causing a pop noise to be produced. To suppress the noise, it is recommended that a longer charging time be used for C2 as well as for C1 and C6. Note that the time which audio output takes to start will be longer, since C2 determines the muting time (the time from when the power is turned on to when audio output starts). The pop noise which is generated when the muting function is turned on/off will vary according to the time constant for C4. The greater the capacitance, the lower the pop noise. Note that the time from when the muting control signal is applied to C4 to when the muting function is turned on/off will be longer. 7. External Component Constants Component Name Effect Recommended Value Purpose Smaller than Recommended Value Larger than Recommended Value C1 0.22 µF To eliminate DC Cutoff frequency is increased Cutoff frequency is reduced C2 10 µF To reduce ripple Powering on/off is faster Powering on/off is slower C3 0.1 µF To provide sufficient oscillation margin Reduces noise and provides sufficient oscillation margin C4 1 µF To reduce pop noise High pop noise Low pop noise Duration until muting function Duration until muting function is turned on/off is short is turned on/off is long C5 3900 µF Ripple filter Power supply humming and ripple filtering C6 1 µF NF for all outputs Pop noise is suppressed when C1:C6 = 1:4 Remarks Affects the pop noise generated when VCC is turned on Affects the pop noise generated when VCC is turned on 8. Preventive measure against oscillation For preventing the oscillation, check that the application circuit and actual load makes no abnormal oscillation under all the necessary condition. Especially, perform the temperature test to check the oscillation margin since the oscillation margin is varied according to the causes described below, 1) Layout of printed board 2) Type of Speaker 3) Value and kind of the capacitor between the output(+) and output(-) 4) Value and kind of the CR filter or the capacitor between each output and GND. 7 2005-08-17 TB2905HQ Maximum Ratings (Ta = 25℃) Characteristics Symbol Rating Unit VCC (surge) 50 V DC supply voltage VCC (DC) 25 V Operating supply voltage VCC (opr) 18 V Peak supply voltage (0.2 s) Output current (peak) IO (peak) 9 A PD (Note 5) 125 W Operating temperature Topr −40~85 °C Storage temperature Tstg −55~150 °C Power dissipation Note 5: Package thermal resistance (θjT = 1°C/W) (Ta = 25°C, with infinite heat sink) The absolute maximum ratings of a semiconductor device are a set of specified parameter values which must not be exceeded during operation, even for an instant. Exposure to conditions beyond those listed above may cause permanent damage to the device or affect device reliability, which could increase potential risks of personal injury due to IC blowup and/or burning. The equipment manufacturer should design so that no maximum rating value is exceeded with respect to current, voltage, power dissipation, temperature, etc. Ensuring that the parameter values remain within these specified ranges during device operation will help to ensure that the integrity of the device is not compromised. 8 2005-08-17 TB2905HQ Electrical Characteristics (unless otherwise specified, VCC =13.2 V, f =1 kHz, RL = 4 Ω, Ta = 25°C) Symbol Test Circuit ICCQ POUT MAX (1) Min Typ. Max Unit VIN = 0 200 300 mA VCC = 14.4 V, max POWER 47 POUT MAX (2) VCC = 13.7 V, max POWER 43 POUT (1) VCC = 14.4 V, THD = 10% 29 POUT (2) THD = 10% 23 25 POUT MAX (1) VCC = 14.4 V, max POWER 80 POUT MAX (2) VCC = 13.7 V, max POWER 77 POUT (1) VCC = 14.4 V, THD = 10% 55 POUT (2) THD = 10% 42 45 THD POUT = 2 W 0.03 0.2 % GV VOUT = 0.775 Vrms 24 26 28 dB △GV VOUT = 0.775 Vrms −1.0 0 1.0 dB VNO (1) Rg = 0 Ω, DIN45405 130 VNO (2) Rg = 0 Ω, BW = 20 Hz~20 kHz 120 270 Ripple rejection retio R.R. frip = 100 Hz, Rg = 620 Ω Vrip = 0.775 Vrms 50 60 dB Crosstalk C.T. Rg = 620 Ω VOUT = 0.775 Vrms 70 dB VOFFSET -150 0 150 mV Input resistance RIN 90 kΩ Standby current ISB Standby state 2 10 µA VSB H POWER: ON, clipping detection on pin 25 7.5 VCC VSB M POWER: ON, offset detection on pin 25 2.5 6.0 VSB L POWER: OFF 0 0.5 VM H MUTE: OFF 2.5 6.0 VM L MUTE: ON, R1 = 47 kΩ 0 0.5 Muting attenuation ATT M MUTE: ON VOUT = 7.75 Vrms → Mute: OFF 80 90 dB Offset detection threshold voltage Voff-set Rpull-up = 47 kΩ, +V= 5.0 V Based on normal output DC voltage ±1.0 ±1.5 ±2.0 V Characteristics Quiescent supply current Output power Output power (RL = 2 Ω) Total harmonics distortion Voltage gain Interchannel voltage gain Output noise voltage Output offset voltage Standby control voltage Muting control voltage Test Conditions 9 W W µVrms V V 2005-08-17 TB2905HQ 6 VCC2 OUT1 (+) 0.22 µF C1 11 PW-GND1 8 OUT2 (+) C1 12 9 IN1 OUT1 (−) 0.22 µF C3 0.1 µF 20 VCC1 3900 µF 1 TAB C5 Test Circuit RL 7 5 IN2 PW-GND2 2 OUT2 (−) RL 3 1 µF C6 16 AC-GND OUT3 (+) 0.22 µF C1 15 IN3 PW-GND3 18 OUT3 (−) OUT4 (+) 0.22 µF C1 14 RL 19 21 IN4 PW-GND4 24 OUT4 (−) RL 23 13 10 4 OFF-SET CLP-DET MUTE 25 22 C4 1 µF STBY 10 µF RIP C2 PRE-GND 17 3.3V 47 kΩ PLAY R1 MUTE : PRE-GND : PW-GND Components in the testing circuit are only used to determine the device’s characteristics. Toshiba does not guarantee that those components prevent the application equipment from malfunctioning or failing. 10 2005-08-17 TB2905HQ T.H.D – POUT (OUT) T.H.D – POUT (OUT) 100 (%) VCC = 13.2 V RL = 4 Ω Ch = 1 ch, 3 ch 10 Total harmonic distortion T.H.D Total harmonic distortion T.H.D (%) 100 1 10 kHz 0.1 VCC = 13.2 V RL = 4 Ω Ch = 2 ch, 4 ch 10 1 0.1 1 kHz 10 kHz 100 Hz 100 Hz 1 kHz 0.01 0.1 1 Output power 10 POUT 0.01 0.1 100 (W) 1 Output power T.H.D – POUT (OUT) 10 POUT (W) T.H.D – POUT (OUT) 100 100 VCC RL = 4 Ω Ch = 1 ch, 3 ch VCC RL = 4 Ω Ch = 2 ch, 4 ch 9V 9V (%) 13.2 V 16 V 10 Total harmonic distortion T.H.D Total harmonic distortion T.H.D (%) 13.2 V 1 0.1 0.01 0.1 100 1 Output power 10 POUT 1 0.1 0.01 0.1 100 (W) 16 V 10 1 Output power 11 10 POUT 100 (W) 2005-08-17 TB2905HQ T.H.D – POUT (OUT) T.H.D – POUT (OUT) 100 (%) VCC = 13.2 V RL = 2 Ω Ch = 1 ch, 3 ch 10 Total harmonic distortion T.H.D Total harmonic distortion T.H.D (%) 100 1 10 kHz 0.1 VCC = 13.2 V RL = 2 Ω Ch = 2 ch, 4 ch 10 1 10 kHz 0.1 100 Hz 1 kHz 1 kHz 100 Hz 0.01 0.1 1 Output power 10 POUT 0.01 0.1 100 (W) 1 Output power T.H.D – POUT (OUT) 10 POUT (W) T.H.D – POUT (OUT) 100 100 VCC RL = 2 Ω Ch = 1 ch, 3 ch VCC RL = 2 Ω Ch = 2 ch, 4 ch 13.2 V (%) 10 Total harmonic distortion T.H.D Total harmonic distortion T.H.D (%) 13.2 V 9V 1 16 V 0.1 0.01 0.1 100 1 Output power 10 POUT 9V 10 1 16 V 0.1 0.01 0.1 100 (W) 1 Output power 12 10 POUT 100 (W) 2005-08-17 TB2905HQ T.H.D – f (%) VCC = 13.2 V RL = 4 Ω Total harmonic distortion T.H.D Total harmonic distortion T.H.D (%) T.H.D – f 10 OUT 1/3 1 OUT 2/4 0.1 0.01 0.01 0.1 1 10 100 10 VCC = 13.2 V RL = 2 Ω OUT 1/3 1 OUT 2/4 0.1 0.01 0.01 0.1 Frequency (Hz) C.T. – f (OUT1) 100 C.T. – f (OUT2) 0 VCC = 13.2 V RL = 2 Ω VOUT = 0dBm (0.775 Vrms) Rg = 620 Ω −10 Cross talk C.T. (dB) Cross talk C.T. (dB) −20 10 Frequency (Hz) 0 −10 1 −30 −40 CT (1-2) CT (1-3) −50 −60 −20 VCC = 13.2 V RL = 2 Ω VOUT = 0dBm (0.775 Vrms) Rg = 620 Ω −30 −40 CT (2-1) −50 CT (2-3) −60 CT (1-4) CT (2-4) −70 10 100 1000 10000 −70 10 100000 100 C.T. – f (OUT3) 0 VCC = 13.2 V RL = 2 Ω VOUT = 0dBm (0.775 Vrms) Rg = 620 Ω −10 Cross talk C.T. (dB) Cross talk C.T. (dB) 100000 C.T. – f (OUT4) 0 −20 10000 Frequency (Hz) Frequency (Hz) −10 1000 −30 −40 CT (3-1) −50 CT (3-2) −60 −20 VCC = 13.2 V RL = 2 Ω VOUT = 0dBm (0.775 Vrms) Rg = 620 Ω −30 −40 −50 CT (4-1) −60 CT (3-4) CT (4-2) CT (4-3) −70 10 100 1000 10000 −70 10 100000 Frequency (Hz) 100 1000 10000 100000 Frequency (Hz) 13 2005-08-17 TB2905HQ VNO – Rg (dB) 200 R.R. 250 R.R. – f 0 VCC = 13.2 V RL = 4 Ω Filter DIN audio 150 リップル除去率 出力雑音電圧 VNO (µVrms) 300 100 50 0 10 100 1000 10000 −10 VCC = 13.2 V RL = 4 Ω −20 −30 −40 −50 −60 −70 2ch −80 0.01 100000 1 周 波 GV – f (W) Gv_4ch 25 Gv_2ch 23 22 0.1 1 10 60 50 40 21 RL = 4 Ω 4ch drive 30 VCC = 16 V VCC = 13.2 V 20 VCC = 9 V 10 0 0.1 100 1 Frequency (Hz) PD – POUT (RL = 2 Ω) 100 POUT/ (W) Iccq – VCC 500 f = 1 kHz 450 RL = 2 Ω 4ch drive 400 VCC = 16 V 60 VCC = 13.2 V 40 RL = ∞ Vin = 0 350 (mA) 80 Iccq (W) PD Power dissipation 10 Output power 120 100 f (kHz) f = 1 kHz Gv_3ch Gv_1ch 20 0.01 100 PD – POUT PD 24 数 10 70 VCC = 13.2 V RL = 4 Ω Power dissipation GV (dB) 26 Voltage gain 27 4ch 0.1 Signal source resistance Rg (Ω) 28 1ch 3ch 300 250 200 150 100 VCC = 9 V 20 50 0 0.1 1 Output power 10 0 0 100 5 10 VCC POUT/ (W) 14 15 20 25 (V) 2005-08-17 TB2905HQ PD MAX –Ta 120 ① INFINITE HEAT SINK 許容損失 PD MAX (W) RθJC = 1°C/W 100 ② HEAT SINK (RθHS = 3.5°C/W) RθJC + RθHS = 4.5°C/W ③ 80 NO HEAT SINK RθJA = 39°C/W ① 60 40 20 ② ③ 0 0 25 50 周囲温度 75 100 Ta 125 150 (°C) 15 2005-08-17 TB2905HQ Package Dimensions Weight: 7.7 g (typ.) 16 2005-08-17 TB2905HQ About solderability, following conditions were confirmed • Solderability (1) Use of Sn-63Pb solder Bath · solder bath temperature = 230°C · dipping time = 5 seconds · the number of times = once · use of R-type flux (2) Use of Sn-3.0Ag-0.5Cu solder Bath · solder bath temperature = 245°C · dipping time = 5 seconds · the number of times = once · use of R-type flux RESTRICTIONS ON PRODUCT USE 030619EBF • The information contained herein is subject to change without notice. • The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by TOSHIBA for any infringements of patents or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of TOSHIBA or others. • TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such TOSHIBA products could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and conditions set forth in the “Handling Guide for Semiconductor Devices,” or “TOSHIBA Semiconductor Reliability Handbook” etc.. • The TOSHIBA products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.). These TOSHIBA products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury (“Unintended Usage”). Unintended Usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in this document shall be made at the customer’s own risk. • The products described in this document are subject to the foreign exchange and foreign trade laws. • TOSHIBA products should not be embedded to the downstream products which are prohibited to be produced and sold, under any law and regulations. • This product generates heat during normal operation. However, substandard performance or malfunction may cause the product and its peripherals to reach abnormally high temperatures. The product is often the final stage (the external output stage) of a circuit. Substandard performance or malfunction of the destination device to which the circuit supplies output may cause damage to the circuit or to the product. 17 2005-08-17