BD5424EFS

Middle Power Class-D Speaker Amplifiers Analog Input / BTL Output Class-D Speaker Amplifier BD5424EFS No.10075EBT04 ●Description BD5424EFS is a 20W + 20W 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 91% (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 40W. This product satisfies both needs for drastic downsizing, low-profile structures and powerful, high-quality playback of the sound system. ●Features 1) A high efficiency of 91% (10W + 10W output with 8Ω load), which is the highest grade in the industry and low heat-generation. 2) An output of 20W + 20W (17V, with 8Ω load) is allowed without an external heat radiator. 3) Driving a lowest rating load of 3.6Ω 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 (350kHz to 500kHz) 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 BD5424EFS ●Operating Conditions The following values assume Ta =25℃. Check for latest values in delivery specifications. Parameter Supply voltage Minimum load resistance (Note 5) Pd should not be exceeded. Technical Note Symbol VCC RL Ratings +10 ~ +18 3.6 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", SDX="H". 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) Mute Attenuation Internal sampling clock frequency GV PO1 PO2 THD CT VNO VNOM Gvm FOSC 28 10 20 0.1 85 80 35 98 350 dB W W % dB µVrms µVrms dB kHz PO = 1W THD+N = 10% Vcc=17V, THD+N = 10% PO = 1W, BW=20Hz ~ 20kHz PO = 1W, Rg = 0Ω, BW = IHF-A Rg = 0Ω, BW = IHF-A Rg = 0Ω, BW = IHF-A, MUTEX = “L” Po =1W, 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 30 12 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 BD5424EFS ●Electrical characteristic curves (Reference data) (1) Under Stereo Operation (RL=8Ω) 100 10 THD+N (%) 1 0.1 0 .01 0.001 0.01 0.1 1 10 100 Vcc=12V RL=8Ω BW=20～20kHz 6kHz Technical Note 100 10 THD+N (%) 1 0.1 0.01 10 100 1000 FREQUENCY (Hz) Fig. 1 THD+N － Output power Fig. 2 THD+N － Frequency Vcc=12V RL=8Ω Po=1W BW=20～20kHz 1kHz 100Hz OUTPUT POWER (W) 10000 100000 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 25 20 15 10 5 0 THD=1% RL=8Ω fin=1kHz THD=10% 0.01 0.1 1 10 100 8 10 12 14 VCC (V) 16 18 20 OUTPUT POWER (W) Fig. 5 Crosstalk - Output power Fig. 6 Output power - Power supply voltage www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 3/17 2010.05 - Rev.B BD5424EFS ●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 15 3 Vcc=18V 2 Vcc=18V RL=8Ω fin=1kHz EFFICIENCY (%) Vcc=12V Vcc=10V ICC (A) 1 RL=8Ω fin=1kHz 0 20 25 0 5 10 15 20 25 30 35 40 45 50 TOTAL OUTPUT POWER (W) OUTPUT POWER (W/ch) Fig. 9 Efficiency - Output power Fig. 10 Current consumption - Output power 100 90 80 70 60 50 40 30 20 10 0 8 0 RL=8Ω NOISE FFT (dBV) Without signal 無信号時 -20 -40 -60 -80 -100 -120 -140 ICC (mA) Sampling Vcc=12V RL=8Ω Without signal 無信号時 BW=20～20kHz Mute 10 12 14 VCC (V) 16 18 10 100 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 BD5424EFS ●Electrical characteristic curves (Reference data) – Continued Technical Note M UTEX Pin 20 10V/div TM Pin 26 5V/div Vcc=12V M UTEX Pin 20 RL =8 Ω Po=500m W 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=500mW TM fin=3kHz Pin 26 VHOLD Pin 27 5V/div Vcc=12V RL =8 Ω Po=500mW fin=3kHz 5V/div 5V/div Speaker output 2V/div Speaker output 2msec/div 2V/div 20msec/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 V cc=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 BD5424EFS ●Electrical characteristic curves (Reference data) – Continued (2)Under Stereo Operation (RL=6Ω) Technical Note 30 OUTPUT POWER (W) 25 20 15 10 5 0 8 10 12 14 VCC (V) Fig. 18 Output power - Power supply voltage R L=6Ω fin=1kHz THD=10% 16 18 20 100 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 20 4 3 ICC (A) Vcc=10V 2 1 0 25 30 Vcc=18V Vcc=12V EFFICIENCY (%) Vcc=18V RL=6Ω fin=1kHz RL=6Ω fin=1kHz 0 5 10 15 20 25 30 35 40 45 50 55 60 TOTAL OUTPUT POWER (W) OUTPUT POWER (W/ch) Fig. 21 Efficiency - Output power Fig. 22 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. 6/17 2010.05 - Rev.B BD5424EFS ●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 15 20 25 6 5 4 ICC (A) 3 2 Vcc=18V RL=4Ω fin=1kHz EFFICIENCY (%) Vcc=10V Vcc=12V Vcc=18V RL=4Ω fin=1kHz 1 0 30 35 40 0 10 20 30 40 50 60 70 80 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 I N1 1 2 GNDA 3 FIL A PW M 1 PW M 2 FIL P V CCA 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 ERROR M UTEX SDX 19 20 21 W A RNING ERROR M ute Control 44 IN2 43 GNDA 42 FIL A 41 FIL P 40 V CCA 39 BSP2P 38 V CCP2P 37 V CCP2P 36 OUT2P 35 OUT2P 34 GNDP2 33 GNDP2 32 OUT2N 31 OUT2N 30 V CCP2N 29 V CCP2N 28 BSP2N Protections & L ogic Under V oltage Protection High Temperature Protection SD Control BD5424EFS ●Pin Assignment 1.0 MAX PL M T1 PL M T2 PL M T3 PL M T4 BSP1P V CCP1P V CCP1P OUT1P DRI V ER 1P OUT1P GNDP1 GNDP1 OUT1N OUT1N V CCP1N V CCP1N BSP1N DRIV ER 1N Power L imit 0.85 44 1 ●Outer Dimensions and Inscriptions www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. DRI V ER 2P 1PIN MARK 18.5±0.1 (6.0) (MAX 18.85 include BURR) Top View BD5424EFS Fig. 28 Pin Assignment Diagram Fig. 29 Outer Dimensions and Inscriptions of HTSSOP-A44 Package 8/17 TYPE 23 DRIV ER 2N 22 Lot No. (5.0) W A RNING Power- off Detector Soft M ute Ramp Generator Output Short Protection N.C. 22 N.C. Output DC V oltage Protection Clock Control 27 V HOL D 26 TM 25 ROSC 24 M S 23 OSC (Unit: mm) Technical Note 2010.05 - Rev.B BD5424EFS ●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 BD5424EFS ●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 Error output pin 19 ERROR H: 5V L: 0V A pin for notifying operation errors. H: Error L: Normal operation Audio mute control pin 20 MUTEX H: Mute off L: Mute on www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 10/17 2010.05 - Rev.B BD5424EFS ●Explanation of Pin Functions - Continued No. Symbol Pin voltage Technical Note Pin description Internal equalizing circuit Shutdown control pin 21 SDX H: Shutdown off L: Shutdown on 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 Internal PWM sampling clock frequency setting pin 25 ROSC 5.6V 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 BD5424EFS ●Explanation of Pin Functions - Continued No. Symbol Pin voltage Technical Note Pin description Internal equalizing circuit Instantaneous power interruption detecting voltage setting pin 27 HOLD 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 BD5424EFS ●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 C1 1µF C44 1µF BD5424EFS INPUT 1ch 1 GNDA 44 INPUT 2ch ・Vcc=10V ~ 18V R2 22kΩ ●Application Circuit Diagram GNDA 2 GNDA Power Limit C42 10µF C41 1µF C43 10µF C40 0.1µF 43 42 41 VCCA + 3 R3 22kΩ FILA FILP VCCA PWM1 39 C39 1µF 4 R4 22kΩ GNDA L9 10µH C10 0.68µF 0.15µF SP 1ch (4Ω） GNDP 0.68µF L13 10µH Fig. 30 Circuit Diagram of Stereo Operation with 4Ω Load + www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 5 PWM2 6 C6 1µF VCCP 40 VCCP C5 0.1µF 7 8 C37 0.1µF 38 37 36 35 34 33 32 31 30 29 Protections & Logic 28 Power-off Detector SOFT MUTE Mute Control SD Control Output Short Protection Output DC Voltage Protection Ramp Generator Clock Control GNDP + C38 10µF C8 10µF C7 0.1µF 9 10 11 12 13 14 DRIVER 1N DRIVER 2N DRIVER 1P DRIVER 2P L35 10µH C35 0.15µF C9 0.15µF 14/17 C15 0.1µF C32 GNDP L31 10µH C13 C31 SP 2ch (4Ω） 0.15µF C29 0.1µF 15 16 17 C28 1µF C17 1µF WARNING OUTPUT 18 19 20 21 22 N.C. ERROR WARNING Under Voltage Protection High Temperature Protection 27 26 R25 C27 3.3µF C26 0.1µF ERROR OUTPUT MUTE SD 25 24 23 22kΩ SLAVE MASTER CLK I/O Technical Note 2010.05 - Rev.B C23 0.1µF BD5424EFS Table 1 BOM List of Stereo Operation with 4Ω Load No. Item 1 2 3 4 5 6 7 8 9 10 11 12 IC C C C C C C C C C C R Part Number BD5424EFS GRM21BB31H105KA12 GRM188R11H104KA93 GRM21BB31H154KA88 GRM188B31C105KA92 GRM31MR71H684KA88 GRM21BB31E335KA75 GRM188B11E104KA01 GRM21BB11C105KA GRM21BB31C106KE15 25SVPD10M MCR01MZPF2202 Vendor ROHM MURATA MURATA MURATA MURATA MURATA MURATA MURATA MURATA MURATA SANYO ROHM Configuration mm inch Value 1µF 0.1µF 0.15µF 1µF 0.68µF 3.3µF 0.1µF 1µF 10µF 10µF 22kΩ Rated voltage 50V 50V 50V 16V 50V 25V 25V 16V 16V 25V 50V Tolerance ±10% ±10% ±10% ±10% ±10% ±10% ±10% ±10% ±10% ±20% ±1% Temperature Quantity characteristics ±10% ±10% ±10% ±10% ±15% ±10% ±10% ±10% ±10% ±25% ±200ppm/℃ 1 4 5 4 2 2 1 3 1 1 3 3 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,R25 HTSSOP-A44 2012 1608 2012 1608 3216 2012 1608 2012 2012 6666 1005 0805 0603 0805 0603 1206 0805 0603 0805 0805 2626 0402 No. Item 13 L Part Number A7502BY-100M Vendor TOKO Configuration mm φ13×16.0 Value 10µH Tolerance ±20% DC Resistance 30mΩmax. Rated DC Current 5.09A max. Quantity 4 Reference L9, L13, L31, L35 www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 15/17 2010.05 - Rev.B BD5424EFS Technical Note ●Notes for use 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 Power dissipation Pd  Tjmax - Ta θ ja W  W   1   Pdiss  PO - 1  η   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℃. 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) and SDX pin (pin 21), 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 (pin 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 BD5424EFS ●Ordering part number Technical Note B D 5 Part No. 4 2 4 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