Feature description

lm4864 is a bridge audio power amplifier 23 vssop, SOIC, PDIP (1), and WSON packaging can be continuously transported 725MW

] No output coupling capacitor, providing a self -lifting power supply from 5V capacitor or buffer circuit to 8Ω (1%Thd+N).

Designed a hot shutdown protection circuit Boomer audio power amplifier

The unit gain stable, especially providing high -quality output power

External gain configuration capacity low power voltage voltage voltage voltage At the same time, the number of minimum external components is required. Starting from LM4864, it does not require output coupling capacitors, self -lifting capacitors or buffer networks, which is most suitable for

mobile phones for low power consumption portable applications.

Personal computer LM4864 has external control, low power consumption

General audio power consumption shutdown mode and thermal shutdown protection. Key index unit gain closed -loop response

When 1%Thd+N, VDD 5V, 1kHz LM4864 PO can be configured by external gain settings -LM4864LD, 4Ω load 625 mW (typical) resistor. The equipment has multiple packages suitable for various applications. - LM4864LD, 8Ω load 725 MW (typical) – LM4864M and LM4864N (1), 8Ω load 675 MW (typical) – LM4864mm, 8Ω load (2) 300 MW (typical) – LM4864, 16Ω load 550 MW ( Typical) -Capye current 0.7 Wei'an (typical value) (1) It is not recommended for new design. Contact TI audio marketing.

(2) The thermal limit of the DGK0008bA unit is 595 MW at the temperature of 595 MW. In Figure 21, in the typical performance characteristics, the power consumption is 300 MWh, and the restrictions on packaging. This packaging is limited to the temperature temperature of 25 ° C and θJa 210 ° C. The possibility of higher output power refers to power consumption.

(1) Absolute maximum rated value indicates the limit that the device may be damaged. Rate the rated value indicates which device can work normally, but it cannot guarantee specific performance restrictions. Electrical characteristics DC and AC specifications under special test conditions to ensure specific performance restrictions. This assumes that the device is at the rated value. There is no regulation for parameters that do not give restrictions, but the typical value is a good instruction equipment performance.

(2) If you need military/aviation special equipment, please contact the Texas Instrument Sales Office/dealer to obtain availability and specifications.

(3) Maximum power consumption must be reduced at high temperatures, and TJMAX, θJa and environmental temperatures determine teaching assistants. The maximum allowable power consumption is PDMAX (TJMAX-TA)/θJa or the values given in the absolute maximum rated value. For LM4864, tjmax 150 ° C. When it is installed on the board, the typical connection with environmental thermal resistance is the packaging number DGK0008A is 230 ° C/W, the packaging number D008A is 170 ° C/W, and the packaging number P008E*is 107 ° C/W.

(4) Human model, 100PF passes through the 1.5kΩ resistor.

(5) Machine model, 220pf – 240pf Power electricity through all pins.

(6) The exposure of DAP welding encapsulated by Ngy0010A was exposed 1.2in2 area of the 1OZ printing circuit board.

Electric characteristics VDD 5V (1) (2)

The following specifications are suitable for all available packaging of VDD 5V, unless there are other regulations. Restricted applicable to TA 25 degrees Celsius

(1) Unless there are other regulations, all voltages are measured relative to ground pins.

(2) Absolute maximum rated value indicates the limit where the device may be damaged. Rate the rated value indicates which device can work normally, but it cannot guarantee specific performance restrictions. Electrical characteristics DC and AC specifications under special test conditions to ensure specific performance restrictions. This assumes that the device is at the rated value. There is no regulation for parameters that do not give restrictions, but the typical value is a good instruction equipment performance.

(3) The typical value is measured at 25 ° C, which represents the number of parameters.

(4) Limit AOQL (average output quality level) specified as TI.

(5) The minimum/maximum specification limit of the data table is stipulated by design, testing or statistical analysis.

(6) When the actual load is connected to the amplifier, the static power supply current depends on the offset voltage.

(7) Ngy0010A packaged the exposed DAP welding to the exposed 1.2 -inch 21OZ printed circuit board copper area.

(8) DGK0008bA component at room temperature limit is 595 MW. Reference Typical Figure 21 Performance characteristics, the power consumption limit of the packaging occurs when the output power is 300MW. This package is limited to the environmental temperature of 25 ° C and θja 210 ° C. For the possibility of higher output power, see power consumption.

Electric characteristics VDD 3V (1) (2)

Unless there are other regulations, the following specifications are applicable to all VDD 3V available for all -available packaging. Limited to TA 25 degrees Celsius

(1) Unless there are other regulations, all voltage is measured relative to the ground pins.

(2) Absolute maximum rated value indicates the limit where the device may be damaged. Rate the rated value indicates which device can work normally, but it cannot guarantee specific performance restrictions. Electrical characteristics DC and AC specifications under special test conditions to ensure specific performance restrictions. This assumes that the device is at the rated value. There is no regulation for parameters that do not give restrictions, but the typical value is a good instruction equipment performance.

(3) The typical value is measured at 25 ° C, which represents the number of parameters.

(4) Limit AOQL (average output quality level) specified as TI.

(5) The minimum/maximum specification limit of the data table is stipulated by design, testing or statistical analysis.

(6) When the actual load is connected to the amplifier, the static power supply current depends on the offset voltage.

Bridge configuration instructions

As shown in Figure 1, there are two computing amplifiers inside the LM4864, allowing several to allow several several Different amplifiers configuration. The gain of the first amplifier is external -configured, while the second amplifier is fixed in the unit gain and reversed configuration. The closed -loop gain of the first amplifier is to be fixed by two internal 10kΩ resistors by selecting the gain of RF and the second amplifier. Figure 1 shows the input of the amplifier 1 as a amplifier 2, causing the two amplifiers to generate the same signal seismic, but the different phase is 180 °. Therefore, the micro -score gain of IC is

Drived by the output VO1 and VO2 differential load. The amplifier configuration is usually called the bridge mode ". The bridge mold operation is different from the allocated on the side of the traditional single -end amplifier load. Compared with the single -end structure