Middle Power Class-D Speaker Amplifiers Analog Input / BTL Output Class-D Speaker Amplifier No.10075EBT05 BD5426EFS Description BD5426EFS is a 10W + 10W 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 87% (9W + 9W output with 8 load). 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 20W. 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 87% (9W + 9W output with 8 load), which is the highest grade in the industry and low heat-generation. 2) An output of 10W + 10W (13V, with 8 load) is allowed without an external heat radiator. 3) Driving a lowest rating load of 6 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 Symbol Ratings Unit Conditions Pin 7, 8, 15, 16, 29, 30, 37, 38, 40 Supply voltage VCC +20 V (Note 1, 2) 2.0 W (Note 3) Power dissipation Pd 4.5 W (Note 4) Input voltage for signal pin VIN -0.2 ~ +7.2 V Pin 1, 44 (Note 1) Input voltage for control pin VCONT -0.2 ~ Vcc+0.2 V Pin 20, 24 (Note 1) Input voltage for clock pin VOSC -0.2 ~ +7.2 V Pin 23 (Note 1) Operating temperature range Topr -40 ~ +85 Storage temperature range Tstg -55 ~ +150 Maximum junction temperature Tjmax +150 (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 1.6mmFR4 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 1.6mmFR4 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 2010.05 - Rev.B 1/16 2010 ROHM Co., Ltd. All rights reserved. Technical Note BD5426EFS Operating conditions The following values assume Ta =25. Check for latest values in delivery specifications. Parameter Symbol Ratings Unit Conditions Supply voltage VCC +10 ~ +16.5 V Pin 7, 8, 15, 16, 29, 30, 37, 38, 40 Load resistance RL 6 ~ 16 (Note 5) (Note 5) Pd should not be exceeded. Electrical characteristics Except otherwise specified Ta = 25, VCC = 12V, fIN = 1kHz, Rg = 0, RL = 8,MUTEX, MS For latest values, refer to delivery specifications. Parameter Symbol Limits Unit Conditions Whole circuit Circuit current 1 (Sampling mode) I 25 mA With no signal CC1 Circuit current 2 (Muting mode) I 10 mA MUTEX = L CC2 Control circuit H level input voltage V 2.3 ~ 12 V SDX, MUTEX, MS IH L level input voltage V 0 ~ 0.8 V SDX, MUTEX, MS IL Audio circuit Voltage gain GV 28 dB PO = 1W Maximum output power 1 (Note 6) PO1 9 W THD+N = 10% Maximum output power 2 (Note 6) PO2 10 W Vcc = 13V, THD+N = 10% Total harmonic distortion (Note 6) THD 0.1 % PO = 1W, BW=20Hz ~ 20kHz Crosstalk CT 85 dB PO = 1W, Rg = 0, BW = IHF-A Output noise voltage VNO 80 Vrms Rg = 0, BW = IHF-A (Sampling mode) Residual noise voltage VNOM 1 Vrms Rg = 0, BW = IHF-A, MUTEX = L (Muting mode) Internal sampling clock frequency FOSC 250 kHz MS = L (In master operation) (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 2010.05 - Rev.B 2/16 2010 ROHM Co., Ltd. All rights reserved.