Feature description

lm4862 is a bridge -connected audio power supply 2

No output coupling capacitor, guidance needs to provide 675MW capacitor or buffer circuit amplifier 8Ω load 1% under load 1% load 1% load of 1% load Small shape or PDIP packaging THD+N of the continuous average power 5V power supply.

The Boomer audio power amplifier with a stable unit gain

Especially the external gain configuration capabilities, especially the high -quality output power and one

pins compatible with the minimum number of LM4861, the minimum quantity External components. Since LM4862 does not require output coupling capacitors, self -lifting capacitors, or buffer networks, it is the most suitable for low power consumption portable system.

Portable computer LM4862 is characterized by external control, low-mobile phone power shutdown mode, and internal heat shutdown protection mechanism of toys and games. The stable LM4862 of the unit gain can be configured by setting the resistor through the external gain of the critical specifications.

The output power is 8Ω1%(maximum value)

The output power is 8Ω825 MW (typical) [
[ 123] Turn off the current 0.7 μA (typical value)

[3] (3) Maximum power consumption must be reduced at high temperatures, and Determined teaching assistants by TJMAX, θJa and ambient temperature. The maximum allowable power consumption is pdmax (tmax ta)/θJa. For LM4862, tjmax 150 ° C. When installed on the board, the typical connection with environmental thermal resistance is 170 ° C/W (suitable for component number D008A) and 107 ° C/W (suitable for component number) P008E.

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

(1) Unless otherwise specified, all voltage is measured relative to the ground pins.

(2) Absolute maximum rated value indicates the limit where the device may be damaged. The work 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. Without restrictions, the specifications of the parameters cannot be guaranteed, but the typical value is a good instruction equipment performance.

(4) Limit the AOQL (average output quality level) of TI.

(5) 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 LM4862, allowing several different amplifiers configurations. 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 set up the gain of the second amplifier by selecting the radio frequency ratio to be fixed by the two internal 10 kΩ resistors. 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 -scoring gain of IC is the average value 2*(RF/RI) (1) Drive the load of the VO1 and VO2 differential driving load, the amplifier configuration is usually called the establishment of 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