Single-cell and dual-cell lithium battery FP5207 boost amplifier IC combination Bluetooth speaker application

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Single-cell and dual-cell lithium battery FP5207 boost amplifier IC combination Bluetooth speaker application [Copy link]

As consumers' demand for smart homes grows, the smart speaker market has become an important growth point. At the same time, audio technology is also constantly developing, and the functions and performance of audio and speakers are constantly improving.

Bluetooth speakers are powered by lithium batteries and usually use built-in boosted audio amplifier chips. Audio amplifier boost IC is an integrated circuit used in audio systems that can boost low voltage to a voltage suitable for the amplifier chip. Greater power and better sound quality have always been the eternal pursuit of the speaker market.

The speaker is mainly composed of battery, power amplifier, Bluetooth and shell structure. The speaker discharges and has a built-in FP5207 boost chip to boost the battery to power the power amplifier, raising the power supply voltage to the voltage required by the power amplifier chip to provide sufficient power output.

Speaker power system diagram :

In order to meet the portability requirements and provide sufficient power at the same time, speakers are usually equipped with 12V lead-acid batteries. When the power is directly supplied, the general power amplifier chip output power is about 100W . For power exceeding 100W , the current market mainly adopts the combination solution of boost chip FP5207 + audio power amplifier . For speakers above 100W, the 12V battery is not enough to provide enough power for the subsequent audio amplifier, and the boost chip FP5207 is needed to boost the battery voltage to 15V to 24V to meet different power requirements.

Product architecture diagram:

The specific location of the FP5207 chip in the PCB board:

FP5207 is a non-synchronous current mode (CC mode) DC-DC boost converter, which controls the external NMOS through the EXT Pin, inputs a low startup voltage of 2.5V and a voltage operating range of 5V~24V, a single lithium battery 3V~4.2V application, connects Vout to the HVDD Pin, precise feedback voltage 1.2V, built-in soft start time, external programmable operating frequency, programmable inductor peak current limit connects the resistor from the CS Pin to GND, maximum duty cycle 85%, has a large current (8A) drive MOS capability, and can achieve high wattage boost.

FP5207 chip parameters:

Startup voltage: 2.8V

Stable operating voltage range: 5-24V

Feedback reference voltage: 1.2V (±2%)

Low quiescent current: <3μA

Adjustable switching operating frequency: 100-1000KHz

Input under voltage protection (UVP)

Adjustable over current protection (OCP)

Over temperature protection (OTP)

The FP5207 is available in a small footprint SOP-8L (EP) package to accommodate space-saving PCB layout in application areas.

With the right MOS tube, it can achieve a high power of 100W-300W, which is suitable for high-power speakers.

FP5207 efficiency curve:

For high-power electrical appliances, the FP5207 external MOS can perfectly solve the high-power problem. The external MOS can bear larger currents, and the efficiency of the entire circuit will be relatively higher. By comparing the above pictures, we can see that the FP5207 has a wider range of applications and higher adaptability, and can perfectly boost and stabilize the voltage.

Shenzhen Yaxin Control Technology Co., Ltd. has been deeply involved in the chip industry for 20 years. It is the first-level agent of Feeling and MST in Shenzhen. It is committed to promoting and selling power management chips, LED driver chips and Hall switch series products, providing you with the most optimized solutions, the best quality products and consulting services.