RT5510WSC datasheet(4/52 Pages) RICHTEK

4 / 52 page

RT5510

is a registered trademark of Richtek Technology Corporation

www.richtek.com

DS5510-00

October

2019

Operation

Class-D Audio Amplifier

The RT5510 is a 9.5V boosted class-D audio amplifier

capable of delivering up to 4.8Wrms output power into

an 8

 speaker at a supply voltage of 3.6V. The audio

amplifier features low noise (20

Vrms). Signal gains

are configurable through analog (D_SPK_BOOST[2:0]

0 to 18dB, 3dB/step) and digital (VOLUME[7:0] 12 to

115.5dB, 0.5dB/step) circuits.

Over-current protection with threshold of 3A is also

implemented in the high efficiency bridge-tied-load

(BTL)

devices

provide

additional

protection

alongside the current limit of boost converter. The

3-level PWM scheme supports filter less speaker drive.

PLL

The on-chip PLL generates the 24.576MHz clock as

the internal operating clock source. The PLL uses the

BCK of I2S interface as the reference clock and the

programmability of the PLL allows the support of

various sample rate of audio data, like 8k / 11.025k /

12k / 16k / 22.05k / 24k / 32k / 44.1k / 48k / 88.2k /

96kHz. Combining PLL_N_I and PLL_N_F forms an

unsigned number in u13.16 format, which specifies the

ratio of 24.576MHz clock over the reference clock,

BCK.

PLL_CLK = BCK × (PLL_N_I +

PLL_N_F

)

X (PLL_N_I.PLL_N_F)

PLL

BCK

PLL_CLK = 24.576MHz

Over-Voltage Protection

The over-voltage (OV) protection detects whether the

PVDD voltage exceeds 11.5V to 12.5V. If the OV flag is

raised, analog circuits will be shut down. System will

check the PVDD voltage and update the status every

200ms.

Over-Current Protection

The over-current protection can detect the over-current

fault on class-D. The fault on the class-D which causes

a large current over 3A triggers the OC flag to the

digital control system and disables the analog blocks

by 200ms. After 200ms cooling time, the OC protection

detects the current again to determinate if the OC event

is finished.

Under-Voltage Protection

The

under-voltage

protection

can

detect

the

under-voltage fault on power supply VBAT. The UV flag

is triggered when VBAT is lower than UVLO, then

digital control system disables the analog blocks by

200ms. After 200ms cooling time, the UV protection

detects the voltage again to determinate if the UV

event is finished.

Over-Temperature Protection

The

over-temperature

protection

can

detect

the

over-temperature fault on the chip. The OT protection

is triggered when temperature sensed by TEMP sense

is higher than 150°C, then the digital control system

disables the analog blocks by 200ms. After 200ms

cooling time, the OT protection detects the temperature

again to determinate if the OT event is finished with the

hysteresis threshold 120°C.

VBAT Sense

The VBAT sense monitors the battery voltage between

the range from 2V to 6.375V with 8bit resolution, the

output is shown in the register “ 0x48 VBAT” with the

equation battery voltage (V) = VBAT code (DEC) / 40.

Temp. Sensing

Temperature sense monitors the temperature of the

chip with the range between

40°C to 175°C with 9-bit

resolution, the output is shown in the register

“VPTAT”

with

the

equation

code

temperature

(K)

temperature (°C) + 273.

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