Features

External gain setting resistor

save space package

– 20 stitches, 4 mm × 4 mm thin QFN, 4 mm × 4 mm thin QFN, Thermal optimization power board #8482; parcel

ground reference output to eliminate DC blocking capacitors

-reduce circuit board area

- Reduce component costs

- Improve THD+N performance

-Eversion capacitor will not reduce low frequency response

Wide power supply range: 1.8 v to 4.5 v

# 8226; In the 3.3 V power supply, 2 VRMS/CH output voltage to 600

Independent left and right channel shutdown control

short circuit and thermal protection [ 123]

POP reduction circuit

Application

Top box

CD/DVD player

] DVD receiver

htib

PDP/LCD TV

Instructions

DRV601 It is a stereo line drive that allows removing output DC blocking capacitors to reduce the number and cost of components. This device is very suitable for single -power electronic products with key design parameters.

DRV601 can drive 2 VRMS to 600Ω load at a voltage of 3.3V. The device has an external gain setting resistor, supporting the range range of -1V/V to -10V/V. The line output has a protection of ± 8-kv IEC ESD. The device has independent shutdown control to the left and right channels.

DRV601 provides 4 mm × 4 mm thin QFN packaging.

Function box diagram

Typical features

c (pump) c (pvss) 1 μF, CIN 1 μF, RIN 10 10 K , RFB 20 k (unless there is another explanation).

Chart

line driver amplifier Need to block the capacitor. The above figure in FIG. 13 illustrates the traditional line drive amplifier and load and output signalsConnection.

The value of DC closed lock capacitors is often high. Line load (typical resistance value is 600 to 10 k ) with DC closed lock capacitors to form high -pass filters. Formula 1 shows the relationship between load impedance (RL), capacitors (CO) and cut -off frequency (FC).

CO can be determined by equal 2, where the load impedance and cut -off frequency are known.

If the FC is very low, the capacitor must have a high value because the load resistance is small. Large capacitors require large packaging size. The large package size consumes PCB area, which is higher than PCB, increases assembly costs, and reduces the preservation of audio output signals.

Direct path #8482; The amplifier structure runs from a single power supply, but provides a negative voltage track with internal charge pump. Combined with the positive tracks provided by the user and the negative of the IC, the device runs in an effective division mode. The output voltage is now concentrated in zero, which can swing to the right or negative. Direct path #8482; A amplifier does not require output DC blocking capacitors. The bottom box diagram and waveform of FIG. 13 illustrates the ground driver architecture of the ground. This is the architecture of DRV601.

The charge pump flight capacitor and PVSS capacitor

The charge pump flying capacitor is used to transfer the charge during the production of the negative power supply voltage. PVSS capacitors must be at least equal to the charge pump capacitor to allow maximum charge transfer. Low ESR capacitor is an ideal choice with a typical value of 1 μF. The capacitance value of less than 1 μF can be used, but the maximum output voltage may be reduced, and the device may not be able to run according to specifications.

Remove the capacitor

DRV601 is a direct path #8482; line driver amplifier requires enough power to be coupled to ensure that noise and total harmonic distortion (THD) are low. A good low -equal series resistance (ESR) ceramic capacitor is usually 2.2 μF. It is placed where the VDD lead as close to the device is the best. Putting this off -coupled container near DRV601 is important for the performance of the amplifier. For low -frequency noise signals, 10 μF or larger capacitors near the audio power amplifier are also helpful, but it does not need it in most applications because the PSRR of the device is very high.

Increase setting resistance range

Must be selected to set the resistor RIN and RFB to keep the noise, stability, and input capacitor size of the DRV601 in the acceptable range. The voltage gain is defined as RFB divided by Rin.

The value of too low input requires a large input AC coupling capacitor, CIN. Choose too high value will increaseThe noise of the amplifier. Table 1 lists the recommended resistance value of different gain settings.

Input the locking capacitor

DC input blocking capacitors need to be connected to the input pin of DRV601 with the audio signal. These capacitors block the DC parts of the audio source and allow DRV601 to input appropriate bias to provide maximum performance.

These capacitors and input resistance RIN form high -pass filter. Calculated by Formula 3 for the deadline. In this calculation, the capacitance used is to input the blocking capacitor, and the resistance is the input resistance selected from the gain table above. When one of the two values is given, the frequency and/or capacitance can be determined.

The power supply voltage is limited to 4.5 v

DRV601 has a built -in charge pump to be used to generate negatively for the line drive. Because the circuit drive is powered by positive voltage and negative voltage, the circuit has been used to protect the devices in the amplifier from the effect of the voltage. Once the power supply is higher than 4.5 V, the DRV601 can be turned off in an overvoltage protection mode to prevent the device from damaging. Once the power supply drops to 4.5 V or lower, the DRV601 will return to normal work.

Capacity load

DRV601 can directly drive up to 330pf high -capacitor loads. By adding 10 or larger series resistors, you can accept higher capacitance loads. The figure below shows the 10kHz signal of 470pf capacitors using 10R series resistors.

Essence The pads on PCB should be allowed to float and cannot be grounded or connected to the power. Connecting this pad to the power supply or grounding will prevent the device from working normally because it is connected to the PVSS inside.

SGND and PGND connection

The SGND and PGND pins of DRV601 must be returned to the decoupling capacitor separately to provide correct device operations. If the SGND and PGND pins are connected directly, the component function is normal and no risk of failure, but the noise and THD performance do not meet the specification requirements.

gain setting resistor

The gain setting the resistor RIN and RFB must be close to the pin 13 and pin 17, respectively, to minimize the capacitor load on these input pins, and ensure that the DRV601 Maximum stability. For the re -start PCB layout, see the DRV601EVM User Guide.