参数资料
| 型号： | NCS8353MNTXG |
| 厂商： | ON Semiconductor |
| 文件页数： | 4/14页 |
| 文件大小： | 0K |
| 描述： | 20W CLASS D AUDIO AMP 32QFN |
| 标准包装： | 2,500 |
| 类型： | D 类 |
| 输出类型： | 2 通道（立体声） |
| 在某负载时最大输出功率 x 通道数量： | 20W x 2 @ 8 欧姆 |
| 电源电压： | 8 V ~ 26 V |
| 特点： | 消除爆音，差分输入，静音，短路和热保护，关机 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 32-QFN（5x5） |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
NCS8353
http://onsemi.com
12
Table 2. ALL POWER LIMITS AND VOLTAGES REFERENCED TO 8 W LOAD
Plimit
20 W
15 W
12 W
10 W
AV
20 dB
1.789 Vin(p)
1.549 Vin(p)
1.386 Vin(p)
1.265 Vin(p)
26 dB
894 mVin(p)
775 mVin(p)
693 mVin(p)
632 mVin(p)
32 dB
447 mVin(p)
387 mVin(p)
346 mVin(p)
316 mVin(p)
36 dB
284 mVin(p)
246 mVin(p)
220 mVin(p)
201 mVin(p)
Programmable Gain Control
The NCS8353’s 2-bit gain control can be programmed
either by digital control or by bootstrapping the gain control
pins, G0, G1, to logic HIGH or LOW and are TTL
compatible inputs for soft programming needs. Reference
the electrical characteristics table for minimum and
maximum levels. The logic table shown in Table 3
highlights the amplifier gain settings in dB based on gain
setting.
Table 3.
G1
G0
AMPLIFIER GAIN (dB)
(Typ)
0
20
0
1
26
1
0
32
1
36
Similar to the DPL, if a change in gain is desired the
NCS8353 must be disabled. The gain may then be
programmed to the new desired level and then re-enabled for
the new gain setting to latch.
Fault Detection
The NCS8353 incorporates fault detection circuitry. If a
short circuit occurs the FAULT pin asserts logic HIGH
providing the system designer an error flag for monitoring.
The FAULT flag also asserts HIGH when the NCS8353
enters thermal shutdown. When the NCS8353 cools to
130
°C or once the short circuit condition is removed the
FAULT flag returns LOW.
ShortCircuit Protection
A short can occur to VDD, VSS, or across the load. The
short circuit protection circuitry will disable the output stage
from delivering current to the load when a short is present.
With the short circuit protection circuitry active the internal
power dissipation will be minimized.
The NCS8353’s short circuit protection is analogous to a
power supply’s hiccup mode current limiting operation.
When a short is detected the NCS8353 will disable the
output stage and will attempt to re-enable the output stage
after 18
0 ms. If the short has been removed then the output
stage re-enables and operates normally; however, if the short
is still present the cycle begins again. Internal heat
dissipation is kept to a minimum as current will only flow
during the reset time of the protection circuitry. The hiccup
mode is continuous until the short is removed.
Over Temperature Protection
The thermal protection circuitry of the NCS8353
monitors the maximum junction temperature of the die.
When the temperature increases to 150
°C, the specified
maximum junction temperature, the internal gain of the
device is reduced until the junction temperature is
approximately 130
°C. If the gain reduction is unable to limit
the temperature rise of the junction then the thermal
protection circuitry will completely disable the output stage
once the junction temperature rises above 160
°C. The
NCS8353 will re-enable the output stage when the junction
temperature falls to 130
°C. This provides 30° of thermal
hysteresis.
Enable
The NCS8353 incorporates a single ENABLE control for
right and left audio channels. When ENABLE is asserted
logic LOW, the internal circuitry completely disables each
channel to reduce quiescent current draw from the power
supply. Typical shutdown current for the NCS8353 will be
100
mA typical per channel and startup time from
shutdown is typically
≤250 ms. See the electrical
specification table for conditions.
The ENABLE function also serves to latch new values for
gain and the DPL. When new levels are desired the
NCS8353 must be disabled, the new values must be
programmed, and then re-enabled for the new values to
Mute Function
The MUTE function will ensure any audio signal present
at the input is inaudible at the speaker load. The right and left
channels are not in shutdown during this time. During the
MUTE state, the outputs will continue to switch at 50% duty
cycle; however, a modulated audio signal will not be
present. The MUTE function is activated with a logic HIGH
signal and deactivated with a logic LOW signal.
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