BD5423AEFS-E2

Middle Power Class-D Speaker Amplifiers Analog Input / BTL Output Class-D Speaker Amplifier BD5423AEFS No.10075EBT02 ●Description BD5423AEFS is a 17W + 17W stereo class-D power amplifier IC, developed for space-saving and low heat-generation applications such as low-profile TV sets. The IC employs state-of-the-art Bipolar, CMOS, and DMOS (BCD) process technology that eliminates turn-on resistance in the output power stage and internal loss due to line resistances up to an ultimate level. With this technology, the IC has achieved high efficiency of 90% (10W + 10W output with 8Ω load), which is the top class in the industry. The IC, in addition, employs a compact back-surface heat radiation type power package to achieve low power consumption and low heat generation and eliminates necessity of installing an external radiator, up to a total output of 34W. This product satisfies both needs for drastic downsizing, low-profile structures and powerful, highquality playback of the sound system. ●Features 1) A high efficiency of 90% (10W + 10W output with 8Ω load), which is the highest grade in the industry and low heat-generation. 2) An output of 17W + 17W (12V, with 4Ω load) is allowed without an external heat radiator. 3) Driving a lowest rating load of 4Ω is allowed. 4) Pop noise upon turning power on/off and power interruption has been reduced. 5) High-quality audio muting is implemented by soft-switching technology. 6) An output power limiter function limits excessive output to speakers. 7) High-reliability design provided with built-in protection circuits against high temperatures, against VCC shorting and GND shorting, against reduced-voltage, and against applying DC voltage to speaker. 8) A master/slave function allowing synchronization of multiple devices reduces beat noises. 9) Adjustment of internal PWM sampling clock frequencies (250kHz to 400kHz) allows easy protective measures against unwanted radio emission to AM radio band. 10) A compact back-surface heat radiation type power package is employed. HTSSOP-A44 (5mm × 7.5mm × 1.0mm, pitch 0.8mm ) ●Absolute Maximum Ratings A circuit must be designed and evaluated not to exceed absolute maximum rating in any cases and even momentarily, to prevent reduction in functional performances and thermal destruction of a semiconductor product and secure useful life and reliability. The following values assume Ta =25℃. For latest values, refer to delivery specifications. Parameter Supply voltage Power dissipation Input voltage for signal pin Input voltage for control pin Input voltage for clock pin Operating temperature range Storage temperature range Maximum junction temperature Symbol VCC Pd VIN VCONT VOSC Topr Tstg Tjmax Ratings +20 2.0 4.5 -0.2 ～ +7.2 -0.2 ～ Vcc+0.2 -0.2 ～ +7.2 -40 ～ +85 -55 ～ +150 +150 Unit V W W V V V ℃ ℃ ℃ Conditions Pin 7, 8, 15, 16, 29, 30, 37, 38, 40 (Note 1, 2) (Note 3) (Note 4) Pin 1, 44 (Note 1) Pin 20, 24 (Note 1) Pin 23 (Note 1) (Note 1) A voltage that can be applied with reference to GND (pins 11, 12, 33, 34, and 43) (Note 2) Pd and Tjmax=150℃ must not be exceeded. (Note 3) 70mm × 70mm × 1.6mm FR4 One-sided glass epoxy board (Back copper foil 0%) installed. If used under Ta=25℃ or higher, reduce 16mW for increase of every 1℃. The board is provided with thermal via. (Note 4) 70mm × 70mm × 1.6mm FR4 Both-sided glass epoxy board (Back copper foil 100%) installed. If used under Ta=25℃ or higher, reduce 36mW for increase of every 1℃. The board is provided with thermal via. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 1/17 2010.05 - Rev.B BD5423AEFS ●Operating Conditions The following values assume Ta =25℃. Check for latest values in delivery specifications. Parameter Supply voltage Load resistance (Note 5) Pd should not be exceeded. Technical Note Symbol VCC RL Ratings +10～+16.5 4 ～ 16 Unit V Ω Conditions Pin 7, 8, 15, 16, 29, 30, 37, 38, 40 (Note 5) ●Electrical Characteristics Except otherwise specified Ta = 25℃, VCC = 12V, fIN = 1kHz, Rg = 0Ω, RL = 8Ω、MUTEX="H", MS="L" For latest values, refer to delivery specifications. Parameter Whole circuit Circuit current 1 (Sampling mode) Circuit current 2 (Muting mode) Control circuit “H” level input voltage “L” level input voltage Audio circuit Voltage gain Maximum output power 1 (Note 6) Maximum output power 2 (Note 6) Total harmonic distortion (Note 6) Crosstalk Output noise voltage (Sampling mode) Residual noise voltage (Muting mode) Internal sampling clock frequency GV PO1 PO2 THD CT VNO VNOM FOSC 28 10 17 0.1 85 80 1 250 dB W W % dB µVrms µVrms kHz PO = 1W THD+N = 10%, RL = 8Ω THD+N = 10%, RL = 4Ω PO = 1W, BW=20Hz～20kHz PO = 1W, Rg = 0Ω, BW = IHF-A Rg = 0Ω, BW = IHF-A Rg = 0Ω, BW = IHF-A, MUTEX = “L” MS = “L” (In master operation) VIH VIL 2.3～12 0～0.8 V V SDX, MUTEX, MS SDX, MUTEX, MS ICC1 ICC2 25 10 mA mA With no signal MUTEX = “L” Symbol Limits Unit Conditions (Note 6) The rated values of items above indicate average performances of the device, which largely depend on circuit layouts, components, and power supplies. The reference values are those applicable to the device and components directly installed on a board specified by us. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 2/17 2010.05 - Rev.B BD5423AEFS ●Electrical characteristic curves (Reference data) (1) Under Stereo Operation(RL=8Ω) Technical Note 100 Vcc=12V RL=8Ω BW=20～20kHz THD+N (%) 100 Vcc=12V RL=8Ω Po=1W BW=20～20kHz 10 THD+N (%) 10 1 6kHz 1 0.1 1kHz 100Hz 0.1 0.01 0.001 0.01 0.01 0.1 1 OUTPUT POWER (W) 10 100 10 100 1000 10000 FREQUENCY (Hz) 100000 Fig. 1 THD+N － Output power Fig. 2 THD+N － Frequency 40 35 VOLTAGE GAIN (dB) CROSSTALK (dB) 0 -20 Vcc=12V RL=8Ω Po=1W BW=20～20kHz 30 25 20 15 10 5 0 10 100 1000 FREQUENCY (Hz) 10000 100000 Vcc=12V RL=8Ω Po=1W L=33µH C=0.47µF Cｇ=0.1µF -40 -60 -80 -100 10 100 1000 10000 100000 FREQUENCY (Hz) Fig. 3 Voltage gain - Frequency Fig. 4 Crosstalk - Frequency 0 OUTPUT POWER (W) CROSSTALK (dB) -20 -40 -60 -80 -100 0.001 Vcc=12V RL=8Ω fin=1kHz BW=20～20kHz 20 RL=8Ω fin=1kHz THD=10% 15 10 5 0 THD=1% 0.01 Fig. 5 0.1 1 10 100 Fig. 6 8 10 12 14 16 18 OUTPUT POWER (W) Crosstalk - Output power VCC (V) Output power - Power supply voltage www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 3/17 2010.05 - Rev.B BD5423AEFS ●Electrical characteristic curves (Reference data) – Continued Technical Note 100 90 80 70 60 50 40 30 20 10 0 0 5 10 Vcc=10V RL=8Ω fin=1kHz 100 90 80 70 60 50 40 30 20 10 0 0 5 10 EFFICIENCY (%) EFFICIENCY (%) Vcc=12V RL=8Ω fin=1kHz 15 20 15 20 OUTPUT POWER (W/ch) Fig. 7 Efficiency - Output power OUTPUT POWER (W/ch) Fig. 8 Efficiency - Output power 100 90 80 70 60 50 40 30 20 10 0 0 5 10 3 Vcc=16.5V Vcc=12V 2 ICC (A) Vcc=10V 1 Vcc=16.5V RL=8Ω fin=1kHz RL=8Ω fin=1kHz EFFICIENCY (%) 0 15 20 0 5 10 15 20 25 30 35 40 OUTPUT POWER (W/ch) Fig. 9 Efficiency - Output power TOTAL OUTPUT POWER (W) Fig. 10 Current consumption - Output power 100 90 80 70 60 50 40 30 20 10 0 8 0 R =8Ω R LL=8Ω 無信号時 Without signal -20 NOISE FFT (dBV) -40 -60 -80 -100 -120 -140 10 100 Vcc =12V Vcc=12V RL=8Ω RL=8Ω 無信号時 Without signal BW=20～20kHz BW=20 ～ 20kHz ICC (mA) Sampling Mute Without 10 12 14 VCC (V) 16 18 1000 10000 100000 FREQUENCY (Hz) Fig. 12 FFT of Output Noise Voltage Fig. 11 Current consumption - Power supply voltage www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 4/17 2010.05 - Rev.B BD5423AEFS ●Electrical characteristic curves (Reference data) – Continued Technical Note M UTEX Pin 20 10V/div TM Pin 26 5V/div Vcc=12V MUTEX Pin 20 RL =8 Ω Po=500mW fin=500Hz TM Pin 26 10V/div 5V/div Vcc=12V RL =8 Ω Po=500mW fin=500Hz Speaker Output 2V/div 10msec/div Speaker Output 2V/div 10msec/div Fig. 13 Wave form when Releasing Soft-mute Fig. 14 Wave form when Activating Soft-mute V CCA VHOLD Pin 27 TM Pin 26 5V/div VCCA Vcc=12V RL =8 Ω Po=500m W TM fin=3kHz Pin 26 VHOLD Pin 27 5V/div Vcc=12V RL =8 Ω Po=500m W fin=3kHz 5V/div 5V/div Speaker Output 2V/div Speaker Output 20msec/div 2msec/div 2V/div Fig. 15 Wave form on Instantaneous Power Interruption (20msec / div) Fig. 16 Wave form on Instantaneous Power Interruption (2msec / div) Soft Clip 5V/div Speaker Output Soft Clip 200 μ sec/div Vcc=12V RL =8 Ω Po=5W THD+n=10% fin=1kHz R2=91k Ω R3=22k Ω Fig. 17 Wave form on Output Power Limiter function (Po = 5W) www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 5/17 2010.05 - Rev.B BD5423AEFS ●Electrical characteristic curves (Reference data) – Continued (2)Under Stereo Operation(RL=6Ω) Technical Note 25 OUTPUT POWER (W) 20 15 10 5 0 8 10 12 14 16 18 VCC (V) Fig. 18 Output power - Power supply voltage RL=6Ω fin=1kHz THD=10% 100 90 80 70 60 50 40 30 20 10 0 0 5 10 15 Vcc=10V RL=6Ω fin=1kHz 100 90 80 70 60 50 40 30 20 10 0 0 5 10 15 EFFICIENCY (%) EFFICIENCY (%) Vcc=12V RL=6Ω fin=1kHz 20 25 20 25 OUTPUT POWER (W/ch) Fig. 19 Efficiency - Output power OUTPUT POWER (W/ch) Fig. 20 Efficiency - Output power 100 90 80 70 60 50 40 30 20 10 0 0 5 10 15 4 Vcc=16.5V 3 ICC (A) Vcc=10V 2 1 0 0 5 10 15 20 25 30 35 40 45 50 TOTAL OUTPUT POWER (W) Fig. 22 Current consumption - Output power EFFICIENCY (%) Vcc=12V Vcc=16.5V RL=6Ω fin=1kHz RL=6Ω fin=1kHz 20 25 OUTPUT POWER (W/ch) Fig. 21 Efficiency - Output power Dotted lines of the graphs indicate continuous output power to be obtained on musical signal source or by installing additional heat sinks. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 6/17 2010.05 - Rev.B BD5423AEFS ●Electrical characteristic curves (Reference data) – Continued (3) Under Stereo Operation(RL=4Ω) Technical Note 30 OUTPUT POWER (W) 25 20 15 10 5 0 8 10 12 14 16 18 VCC (V) Fig. 23 Output power - Power supply voltage RL=4Ω fin=1kHz THD=10% 100 90 80 70 60 50 40 30 20 10 0 0 5 10 Vcc=10V RL=4Ω fin=1kHz 100 90 80 70 60 50 40 30 20 10 0 0 5 10 EFFICIENCY (%) EFFICIENCY (%) Vcc=12V RL=4Ω fin=1kHz 15 20 15 20 OUTPUT POWER (W/ch) Fig. 24 Efficiency - Output power OUTPUT POWER (W/ch) Fig. 25 Efficiency - Output power 100 90 80 70 60 50 40 30 20 10 0 0 5 10 4 Vcc=12V 3 ICC (A) 2 1 0 15 20 Vcc=10V EFFICIENCY (%) Vcc=16.5V RL=4Ω fin=1kHz Vcc=16.5V RL=4Ω fin=1kHz 0 5 10 15 20 25 30 35 40 OUTPUT POWER (W/ch) Fig. 26 Efficiency - Output power TOTAL OUTPUT POWER (W) Fig. 27 Current consumption - Output power Dotted lines of the graphs indicate continuous output power to be obtained on musical signal source or by installing additional heat sinks. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 7/17 2010.05 - Rev.B BD5423AEFS ●Pin Assignment www.rohm.com I N1 1 2 GNDA 3 FIL A PW M 1 PW M 2 V CCA FILP 4 5 6 7 8 9 DRI VER 1P 10 11 12 13 14 15 16 17 18 W ARNING ERROR M UTEX 19 20 W ARNING ERROR M ute Control N.C. 21 N.C. N.C. 22 N.C. Protections & Logi c Under V ol tage Protection High Temperature Protection Power-off Detector Soft M ute Ramp Generator Output Short Protection Output DC V ol tage Protection Clock Control 44 IN2 43 GNDA 42 FIL A 41 FIL P 40 V CCA 39 BSP2P 38 V CCP2P 37 V CCP2P 36 OU T2P DRI VER 2P 35 OU T2P 34 GNDP2 33 GNDP2 32 OU T2N DRI VER 1N DRI VER 2N 31 OU T2N 30 V CCP2N 29 V CCP2N 28 BSP2N 27 VHOLD 26 TM 25 ROSC 24 M S PLM T1 PLM T2 PLM T3 PLM T4 BSP1P V CCP1P V CCP1P OUT1P OUT1P GNDP1 GNDP1 OUT1N OUT1N V CCP1N V CCP1N 44 1.0 MAX 0.85 1 Power L imi t 0.8 © 2010 ROHM Co., Ltd. All rights reserved. ●Outer Dimensions and Inscriptions 1PIN MARK 18.5±0.1 (MAX 18.85 include BURR) (6.0) Top View BD5423AEFS Fig. 28 Pin Assignment Diagram Fig. 29 Outer Dimensions and Inscriptions of HTSSOP-A44 Package 8/17 TYPE 23 22 Lot No. (5.0) BSP1N (Unit: mm) 2010.05 - Rev.B Technical Note 23 OSC BD5423AEFS ●Explanation of Pin Functions (Provided pin voltages are typical values.) No. Symbol Pin voltage Pin description Technical Note Internal equalizing circuit 1 44 IN1 IN2 3.5V ch1 Analog signal input pin ch2 Analog signal input pin Input audio signal via a capacitor. 2 PLMT1 3.5V Voltage-to-current conversion pin for output power limiter function Connect a register. 3 PLMT2 - Current-to-voltage conversion pin for output power limiter function Connect a register. 4 PLMT3 - Current-to-voltage conversion pin for output power limiter function Connect a register. Bias pin for output power limiter function 5 PLMT4 3.5V Connect a register and a capacitor. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 9/17 2010.05 - Rev.B BD5423AEFS ●Explanation of Pin Functions (continued) No. Symbol Pin voltage 6 BSP1P - Technical Note Pin description Internal equalizing circuit ch1 positive bootstrap pin Connect a capacitor. 7, 8 VCCP1P Vcc ch1 positive power system power supply pin 9, 10 OUT1P Vcc～0V ch1 positive PWM signal output pin Connect with output LPF. 11, 12 GNDP1 0V ch1 power system GND pin 13, 14 OUT1N Vcc～0V ch1 negative PWM signal output pin Connect with output LPF. 15, 16 VCCP1N Vcc ch1 negative power system power supply pin 17 BSP1N - ch1 negative bootstrap pin Connect a capacitor. Warning output pin 18 WARNING H: 5V L: 0V Pin to notify operation warning. H: Under warning L: Normal operation Connect a resister. Error output pin 19 ERROR H: 5V L: 0V A pin for notifying operation errors. H: Error L: Normal operation Connect a resister. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 10/17 2010.05 - Rev.B BD5423AEFS ●Explanation of Pin Functions (continued) No. Symbol Pin voltage Technical Note Pin description Internal equalizing circuit Audio mute control pin 20 MUTEX H: Mute off L: Mute on 21, 22 N.C. - N.C. pin Nothing is connected with IC internal circuit. Sampling clock signal input/output pin 23 OSC When using two or more sampling clocks, connect via a capacitor. Master/Slave switching pin 24 MS Switching of master/slave functions on a sampling clock signal. H: Slave operation L: Master operation 25 ROSC 5.6V Internal PWM sampling clock frequency setting pin Usually the pin is used open. To adjust an internal sampling clock frequency, connect a resister. Audio muting constant setting pin 26 TM 0～5V Connect a capacitor. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 11/17 2010.05 - Rev.B BD5423AEFS ●Explanation of Pin Functions (continued) No. Symbol Pin voltage Technical Note Pin description Internal equalizing circuit Instantaneous power interruption detecting voltage setting pin 27 VHOLD 0.68×Vcc Connect a capacitor. To adjust a detecting voltage, connect a resister. 28 BSP2N - ch2 negative bootstrap pin Connect a capacitor. 29, 30 VCCP2N Vcc ch2 negative power system power supply pin 31, 32 OUT2N Vcc～0V ch2 negative PWM signal output pin Connect an output LPF. 33, 34 GNDP2 0V ch2 power system GND pin 35, 36 OUT2P Vcc～0V ch2 positive PWM signal output pin Connect an output LPF. 37, 38 VCCP2P Vcc ch2 positive power system power supply pin 39 BSP2P - ch2 positive bootstrap pin Connect a capacitor. 40 VCCA Vcc Analog system power pin 41 FILP Vcc+35 12 PWM system bias pin Connect a capacitor. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 12/17 2010.05 - Rev.B BD5423AEFS ●Explanation of Pin Functions (continued) No. Symbol Pin voltage Technical Note Pin description Internal equalizing circuit Analog signal system bias pin 42 FILA 3.5V Connect a capacitor. 43 GNDA 0V Analog system power supply pin www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 13/17 2010.05 - Rev.B BD5423AEFS ●Application Circuit Diagram. www.rohm.com C44 2.2µ F R2 22k Ω GNDA 2 GNDA 3 C42 10µ F FIL A C43 10µ F C41 1µ F PW M 1 PW M 2 V CCA V CCA 40 39 C39 0.68µ F 38 37 C37 0.1µ F 36 35 34 33 GNDP 13 14 15 16 17 R18 100k Ω 19 20 N.C. 21 N.C. N.C. 22 N.C. M ute Control ERROR R19 100k Ω 18 W A RNING Protections & Logic Under V oltage Protection H igh Temperature Protection Power- off Detector Soft M ute Ramp Generator Output Short Protection Output DC V oltage Protection C15 0.1µ F 32 31 30 29 28 27 26 25 OPEN 24 Clock Control M A STER 23 C23 0.1µ F CL K I/O C29 0.1µ F DRIV ER 1N DRIV ER 2N L 31 15µ H FIL P 41 4 R4 5 6 7 8 9 10 11 12 DRIV ER 1P DRIV ER 2P 43 42 C40 0.1µ F 1 44 INPUT ch- 2 GNDA ・Vcc=10V～16.5V INPUT ch- 1 C1 2.2µF Power L imit R3 22k Ω 22k Ω C5 0.1µ F © 2010 ROHM Co., Ltd. All rights reserved. GNDA C6 0.68µ F V CCP C38 10µ F C7 0.1µ F C8 10µ F L 35 15µ H C35 0.22µ F SP ch2 4Ω C32 1µ F C31 0.22µ F C28 0.68µ F C17 0.68µ F GNDD C27 3.3µ F C26 0.1µ F SL A V E V CCP L9 15µ H C9 0.22µ F Fig. 30 Circuit diagram under stereo operation with 4-Ω load 14/17 SP ch1 C10 1µ F W A RNING OUTPUT ERROR OUTPUT C13 0.22µ F 4Ω GNDP L 13 15µ H M UTE 2010.05 - Rev.B Technical Note BD5423AEFS Table 1 BOM list for stereo operation with 4-Ω load No. Item 1 2 3 4 5 6 7 8 9 10 11 12 13 IC C C C C C C C C C C R R Part Number BD5423AEFS GRM219B31E684KA88D GRM188R11H104KA93 GRM31MB11H224KA01 25ST225M3216 50ST105M3225 GRM21BB31E335KA75 GRM188B11E104KA GRM21BB11C105KA GRM21BB31C106KE15 25SVPD10M MCR01MZPF2202 MCR01MZPF1003 Vendor ROHM MURATA MURATA MURATA Rubycon Rubycon MURATA MURATA MURATA MURATA SANYO ROHM ROHM Configuration mm inch Value 0.68µF 0.1µF 0.22µF 2.2µF 1µF 3.3µF 0.1µF 1µF 10µF 10µF 22kΩ 100kΩ Rated voltage 25V 50V 50V 25V 50V 25V 25V 16V 16V 25V 50V 50V Tolerance ±10% ±10% ±10% ±20% ±20% ±10% ±10% ±10% ±10% ±20% ±1% ±1% Temperature Quantity characteristics ±10% ±10% ±10% ±5% ±5% ±10% ±10% ±10% ±10% ±25% ±200ppm/℃ ±200ppm/℃ 1 4 5 4 2 2 1 3 1 1 3 3 2 Technical Note Reference IC1 C6, C17, C28, C39 C7, C15, C29, C37, C40 C9, C13, C31, C35 C1, C44 C10, C32 C27 C5, C23, C26 C41 C42 C8, C38, C43 R2, R3, R4 R18, R19 HTSSOP-A44 2012 1608 3216 3225 3225 2012 1608 2012 2012 6666 1005 1005 0805 0603 1206 1210 1210 0805 0603 0805 0805 2626 0402 0402 No. Item 14 L Part Number 7G09B-150M Vendor SAGAMI Configuration mm 10×9×10 Value 15µH×2 Tolerance ±20% DC Rated Quantity Resistance DC Current 44mΩmax. 4.1A max. 2 Reference L9, L13, L31, L35 www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 15/17 2010.05 - Rev.B BD5423AEFS Technical Note ●Notes for use 1. About absolute maximum ratings If an applied voltage or an operating temperature exceeds an absolute maximum rating, it may cause destruction of a device. A result of destruction, whether it is short mode or open mode, is not predictable. Therefore, provide a physical safety measure such as fuse, against a special mode that may violate conditions of absolute maximum ratings. 2. About power supply line As return of current regenerated by back EMF of output coil happens, take steps such as putting capacitor between power supply and GND as a electric pathway for the regenerated current. Be sure that there is no problem with each property such as emptied capacity at lower temperature regarding electrolytic capacitor to decide capacity value. If the connected power supply does not have sufficient current absorption capacity, regenerative current will cause the voltage on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed the absolute maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a voltage clamp diode between the power supply and GND pins. 3. Potential of GND (11, 12, 33, 34, and 43 pins) Potential of the GND terminal must be the lowest under any operating conditions. 4. About thermal design Perform thermal design with sufficient margins, in consideration of maximum power dissipation Pd under actual operating conditions. This product has an exposed frame on the back of the package, and it is assumed that the frame is used with measures to improve efficiency of heat dissipation. In addition to front surface of board, provide a heat dissipation pattern as widely as possible on the back also. A class-D power amplifier has heat dissipation efficiency far higher than that of conventional analog power amplifier and generates less heat. However, extra attention must be paid in thermal design so that a power dissipation Pdiss should not exceed the maximum power dissipation Pd. Maximum power dissipation Pd  Tjmax - Ta θ ja W  Power dissipation 1    Pdiss  PO - 1 η    W  Tjmax: Maximum temperature junction = 150[℃] Ta: Operating ambient temperature [℃] θja: Package thermal resistance [℃/W] Po: Output power [W] η: Efficiency 5. About operations in strong electric field Note that the device may malfunction in a strong electric field. 6. Thermal shutdown (TSD) circuit This product is provided with a built-in thermal shutdown circuit. When the thermal shutdown circuit operates, the output transistors are placed under open status. The thermal shutdown circuit is primarily intended to shut down the IC avoiding thermal runaway under abnormal conditions with a chip temperature exceeding Tjmax = 150℃, and is not intended to protect and secure an electrical appliance. Accordingly, do not use this circuit function to protect a customer's electrical appliance. 7. About shorting between pins and installation failure Be careful about direction and displacement of an LSI when installing it onto the board. Faulty installation may destroy the LSI when the device is energized. In addition, a foreign matter getting in between LSI pins, pins and power supply, and pins and GND may cause shorting and destruction of the LSI. 8. About power supply startup and shutdown When starting up a power supply, be sure to place the MUTEX pin (pin 20) at “L” level. When shutting down a power supply also, be sure to place the pin at “L” level. Those processes reduce pop noises generated upon turning on and off the power supply. In addition, all power supply pins must be started up and shut down at the same time. 9. About WARNING output pin (pin 18) and ERROR output pin (pin 19) A WARNING flag is output from the WARNING output pin upon operation of the high-temperature protection function and under-voltage protection function. And an ERROR flag is output from the ERROR output pin upon operation of VCC/GND shorting protection function and speaker DC voltage applying protection function. These flags are the function which the condition of this product is shown in. The use which aimed at the protection except for this product is prohibition. 10. About N.C. pins (pins 21 and 22) The N.C. (Non connection) pins are not connected with an internal circuit. Leave the pins open or connect them to GND. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 16/17 2010.05 - Rev.B BD5423AEFS ●Ordering part number Technical Note B D 5 Part No. 4 2 3 A E F S - E 2 Part No. Package EFS:HTSSOP-44 Packaging and forming specification E2: Embossed tape and reel HTSSOP-A44 18.5±0.1 (MAX 18.85 include BURR) (6.0) 44 23 +6° 4° −4° Tape Quantity 1.0±0.2 Embossed carrier tape (with dry pack) 1500pcs E2 The direction is the 1pin of product is at the upper left when you hold 9.5±0.2 7.5±0.1 0.5±0.15 Direction of feed (5.0) ( reel on the left hand and you pull out the tape on the right hand ) 1 0.85 1PIN MARK 22 +0.05 0.17 -0.03 S 1.0MAX 0.08 S 0.85±0.05 0.08±0.05 0.8 +0.05 0.37 -0.04 0.08 M 1pin (Unit : mm) Reel Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 17/17 2010.05 - Rev.B 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. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us. ROHM Customer Support System http://www.rohm.com/contact/ www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. R1010A