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TPA3118D2DAP Datasheet(PDF) 16 Page - Texas Instruments |
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TPA3118D2DAP Datasheet(HTML) 16 Page - Texas Instruments |
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16 / 45 page  2 L P L S OUT L R V R + 2 R P = for unclipped power 2 R æ ö æ ö ´ ç ÷ ç ÷ ç ÷ ´ è ø è ø ´ 16 TPA3116D2, TPA3118D2, TPA3130D2 SLOS708G – APRIL 2012 – REVISED DECEMBER 2017 www.ti.com Product Folder Links: TPA3116D2 TPA3118D2 TPA3130D2 Submit Documentation Feedback Copyright © 2012–2017, Texas Instruments Incorporated (1) PLIMIT measurements taken with EVM gain set to 26 dB and input voltage set to 1 Vrms. where • POUT (10% THD) = 1.25 × POUT (unclipped) • RL is the load resistance. • RS is the total series resistance including RDS(on), and output filter resistance. • VP is the peak amplitude • VP = 4 × PLIMIT voltage if PLIMIT < 4 × VP (2) Table 3. Power Limit Example PVCC (V) PLIMIT VOLTAGE (V)(1) R to GND R to GVDD OUTPUT VOLTAGE (Vrms) 24 V GVDD Open Short 17.9 24 V 3.3 45 kΩ 51 kΩ 12.67 24 V 2.25 24 kΩ 51 kΩ 9 12 V GVDD Short Open 10.33 12 V 2.25 24 kΩ 51 kΩ 9 12 V 1.5 18 kΩ 68 kΩ 6.3 7.3.5 GVDD Supply The GVDD Supply is used to power the gates of the output full bridge transistors. It can also be used to supply the PLIMIT and GAIN/SLV voltage dividers. Decouple GVDD with a X5R ceramic 1 µF capacitor to GND. The GVDD supply is not intended to be used for external supply. It is recommended to limit the current consumption by using resistor voltage dividers for GAIN/SLV and PLIMIT of 100 k Ω or more. 7.3.6 BSPx AND BSNx Capacitors The full H-bridge output stages use only NMOS transistors. Therefore, they require bootstrap capacitors for the high side of each output to turn on correctly. A 220 nF ceramic capacitor of quality X5R or better, rated for at least 16 V, must be connected from each output to its corresponding bootstrap input. (See the application circuit diagram in Figure 37.) The bootstrap capacitors connected between the BSxx pins and corresponding output function as a floating power supply for the high-side N-channel power MOSFET gate drive circuitry. During each high-side switching cycle, the bootstrap capacitors hold the gate-to-source voltage high enough to keep the high- side MOSFETs turned on. 7.3.7 Differential Inputs The differential input stage of the amplifier cancels any noise that appears on both input lines of the channel. To use the TPA31xxD2 family with a differential source, connect the positive lead of the audio source to the RINP or LINP input and the negative lead from the audio source to the RINN or LINN input. To use the TPA31xxD2 family with a single-ended source, ac ground the negative input through a capacitor equal in value to the input capacitor on positive and apply the audio source to either input. In a single-ended input application, the unused input should be ac grounded at the audio source instead of at the device input for best noise performance. For good transient performance, the impedance seen at each of the two differential inputs should be the same. The impedance seen at the inputs should be limited to an RC time constant of 1 ms or less if possible. This is to allow the input dc blocking capacitors to become completely charged during the 10 ms power-up time. If the input capacitors are not allowed to completely charge, there will be some additional sensitivity to component matching which can result in pop if the input components are not well matched. |
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