IS31AP2145E MONO CLIP-LESS & FILTER-LESS CLASS-D AUDIO POWER AMPLIFIER

Transcription

1 MONO CLIP-LESS & FILTER-LESS CLASS-D DESCRIPTION The IS3AP45E is mono, clip-less, filter-less, high efficiency Class-D audio power amplifier with automatic gain control. The IS3AP45E integrates an AGC (Automatic Gain Control) function to automatically prevent distortion of the audio signal by which we can enhance audio quality and also protect the speaker from damage at high power levels. The AGC function and its attack time/release time are selectable via the CTRL pin. The IS3AP45E also provides thermal and over current protection functions. The demo board has four modes (AGC, AGC, AGC OFF, and SHUTDOWN) to test the functionality of the IS3AP45E. FEATURES Operating from V CC =.7V ~ 5.5V Filter-less Class-D architecture AGC enable/disable function.7w into 4Ω at 5.V (% THD+N) Minimum external components High efficiency: 9% Click-and-pop suppression Short-circuit and thermal protection Space-saving UTQFN-9,.5mm.5mm QUICK START RECOMMENDED EQUIPMENT 5.V, A power supply Audio source (i.e. MP3 player, Notebook PC, etc.) 8Ω or 4Ω speakers ABSOLUTE MAXIMUM RATINGS 5.5V power supply Caution: Do not exceed the conditions listed above, otherwise the board will be damaged. PROCEDURE The IS3AP45E demo board is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. ) Connect a 4Ω (or larger) speaker across the OUTterminal and OUT+ terminal or the RCA female connector (SPK CON3). ) Connect the ground terminal of the power supply to the (TP) and the positive terminal to the (TP). Or connect DC power to connector (DC IN) with a.5 mm jack. 3) If the audio source is differential, remove jumper JP, connect the negative of the audio source to the IN- terminal, and connect the positive of the audio source to IN+ terminal. 4) If the audio source is single-ended, connect the audio source to the IN+ terminal, and close jumper JP; or connect audio source to the audio mono connector (AUDIO IN) and close jumper JP. 5) Turn on the power supply, and pay attention to the supply current. If it is over.5a, turn off power and check the evaluation board for short circuit connections. 6) Turn on the audio source. Figure : Photo of IS3AP45E Evaluation Board ORDERING INFORMATION Part No. Temperature Range Package IS3AP45E-UTLS-EB -4 C ~ +85 C (Industrial) UTQFN-9, Lead-free Table: Ordering Information For pricing, delivery, and ordering information, please contact ISSI s analog marketing team at analog@issi.com or (48) Integrated Silicon Solution, Inc. Rev.A, //4

2 MONO CLIP-LESS & FILTER-LESS CLASS-D EVALUATION BOARD OPERATION The IS3AP45E demo board has an LPC9 MCU to read the status of the four buttons which select between the different modes shown in Table Co below. The current operating mode is indicated by the illuminated LED above the appropriate button. The default mode is AGC enabled. Table. Mode settings See the IS3AP45E datasheet for mode configuration details. HIGH-PASS FILTER The evaluation board s high-pass filter consists of the input capacitors C IN (C 4 or C 5 ) and R IN (IS3AP45E internal resistance (8.5kΩ) + (R or R ). The filter s corner frequency, f c, is determined by Equation (). f c R C () IN IN The corner frequency can be adjusted by replacing the R or R Ω resistors with a larger resistor value or by increasing/decreasing the C 4 or C 5 capacitance. SHUTDOWN MODE The SHUTDOWN button selects the power-down mode of the IS3AP45E. Note: The IS3AP45E Mode setting is controlled by the onboard LPC9 MCU. CON DC IN TP C uf C uf C3.uF C uf CON AUDIO IN JP CLOSE=SE OUT- TP3 IN- TP4 IN+ C4 C5 TP CTRL CTRL nf nf R3 R4 R R 68K 33K R5 K R R TP7 SD C.uF A C C IN+ CTRL A VDD B B VREF B3 U OUT+ A3 C3 IS3AP45E OUT+ IN- OUT- TP5 TP6 CON3 SPK Speaker AGC AGC AGC OFF SHUTDOWN K K K3 K4 R6 K 3V R7 K R8 K R9 K U3 RST OSC P. OSC P.3 P.6 P.4 P.7 P.5 P. VDD P. P.6 INT/P.4 INT/P.3 T/P.7 T/P. TXD/P. RXD/P R K R K 3V C9.uF R K R3 K CTRL CTRL D D D3 D4 3V C8 uf C6 uf 5 Vout Vdd U 3 EN BP 4 PAM3 C7 nf LPC9 Figure : IS3AP45E Application Schematic Integrated Silicon Solution, Inc. Rev.A, //4

3 MONO CLIP-LESS & FILTER-LESS CLASS-D Bill of Materials Symbol Description Size Part No. Supplier U Class-D audio amplifier UTQFN-9 IS3AP45E ISSI U Low-dropout regulator SOT3-5 PAM3 PAM U3 Microcontroller TSSOP- LPC9 NXP D~D4 LEDs Blue, SMD /BHC-ZL MRY/3T R, R RES,R,/6W,±5%,SMD 63 YAGEO R3 RES,68K,/6W,±%,SMD 63 YAGEO R4 RES,33K,/6W,±%,SMD 63 YAGEO R5 RES,K,/6W,±%,SMD 63 YAGEO R6~R9 RES,K,/6W,±5%,SMD 63 YAGEO R~R3 RES,K,/6W,±5%,SMD 63 YAGEO C CAP,µF,6V,±%,SMD 85 YAGEO C, C CAP,µF,6V,±%,SMD 63 YAGEO C3, C9,C CAP,.µF,6V,±%,SMD 63 YAGEO C4, C5, C7 CAP,nF,6V,±%,SMD 63 YAGEO C6, C8 CAP,µF,6V,±%,SMD 85 YAGEO K~K4 CON~CON3 TP~TP7 Button SMD Connectors Test pins Bill of materials refers to Figure above. Everlight Integrated Silicon Solution, Inc. 3 Rev.A, //4

4 MONO CLIP-LESS & FILTER-LESS CLASS-D Integrated Silicon Solution, Inc. 4 Rev.A, //4 Figure 3: Board Component Placement Guide -Top Layer Figure 4: Board PCB Layout- Top Layer

5 MONO CLIP-LESS & FILTER-LESS CLASS-D Figure 5: Board Component Placement Guide -Bottom Layer Figure 6: Board PCB Layout-Bottom Layer Copyright 4 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products. Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that: a.) the risk of injury or damage has been minimized; b.) the user assume all such risks; and c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances Integrated Silicon Solution, Inc. 5 Rev.A, //4