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PDF M4670 Data sheet ( Hoja de datos )
| Número de pieza | M4670 | |
| Descripción | FITERLESS HIGH EFFICIENCY 3W SWITCHING AUDIO AMPLIFIER | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de M4670 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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UNISONIC TECHNOLOGIES CO., LTD
M4670
Preliminary
FITERLESS HIGH EFFICIENCY
3W SWITCHING AUDIO
AMPLIFIER
CMOS IC
DESCRIPTION
The M4670 is a fully integrated single-supply, high-efficiency
Class D switching audio amplifier, and it can provide 3W of output
power. Containing adjustable output gain chip with micro-power
shutdown mode, the M4670 has innovative modulation schemes
that eliminate the output filter wave devices and thus reduces the
requirement of external components helping to streamline the circuit
design and reduce board area.
By using delta-sigma modulation technique which handles
incoming analog signal, the M4670 can reduce the output noise and
total harmonic distortion.
Operating on a single 5V supply, the M4670 can be a continuous
average output of 2.3W of power to driver the 4Ω speaker, and the
total harmonic distortion and noise (THD+N) are less than 1%. High
power conversion efficiency of the M4670 can drive a larger load
speaker that is respectively comparable to the typical Class AB
amplifier. Its can be used with a 3.6V, 600mW power supply to
driver an 8Ω speaker, while the efficiency is as high as 88%.
The M4670 has a high output power characteristics that makes it
ideal for ultra-high-power walkie-talkies, mobile phones, hands-free
intercom systems and applications.
FEATURES
* Externally Configurable Gain
* No Output Filter Required for Inductive Loads
* Very Fast Turn on Time: 1.05ms (Typical)
* ‘Click and Pop’ Suppression Circuitry
* Micro-Power Shutdown Mode
* Short Circuit Protection
ORDERING INFORMATION
Ordering Number
M4670G-K08-3030-R
Package
DFN-8(3×3)
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
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M4670
Preliminary
CMOS IC
APPLICATION INFORMATION
GENERAL AMPLIFIER FUNCTION
The M4670 output signal consists of two, BTL connected, of course, the output signal can also be a pulse signal,
the minimum width of each pulse is approximately 350ns. The two outputs can pulse independently exception that
they both may never pulse simultaneously as this would result in zero volts across the BTL load. But in the same row
of as the output pulse occurred in this case, they are connected together, as a broader pulse, to achieve an effective
100% duty cycle occurs. For a given supply voltage and load impedance, the maximum audio output power effects.
The M4670 chip can achieve much high efficiencies than the class AB amplifier, while maintaining acceptable THD
performance.
The short driver pulse output means, a good efficiency can be issued with the M4670 inductive load. For the
typical sensor load audio amplifier is a very passive. To this end, the load can act as its own filter.
POWER DISSIPATION AND EFFICIENCY
In general, efficiency is considered useful in the work required to produce a different power dissipated in the
integrated circuit usually it is divided by the total energy output ratio. For audio systems, the energy delivered in the
audible bands is considered useful including the distortion products of the input signal. Sub-sonic (DC) and
super-sonic components (>22kHz) are not useful. The difference between the power flowing from the power supply
and the audio band power being transduced is dissipated in the M4670 and in the transducer load. The amount of
power dissipation in the M4670 is very low. This is because the on resistance of the switches used to form the output
waveforms is typically less than 0.25Ω. This leaves only the transducer load as a potential "sink" for the small excess
of input power over audio band output power. The M4670 dissipates only a fraction of the excess power requiring no
additional PCB area or copper plane to act as a heat sink.
DIFFERENTIAL AMPLIFIER EXPLANATION
The M4670 is a fully differential amplifier with differential input and output stages. A differential amplifier
amplifies the difference between the two input signals. Traditional audio power amplifiers have typically offered only
single-ended inputs resulting in a 6dB reduction in signal to noise ratio relative to differential inputs. The M4670 also
provides the possibility of DC input coupling, eliminating the need for two external AC coupling, DC blocking
capacitors. The M4670 also can be used, but as a single-ended input amplifier while still retaining it is an entirely
different interests. The main advantage of a differential amplifier is to increase common-mode rejection ratio (CMRR)
for a single input amplifier.
SHUTDOWN FUNCTION
In order to reduce power consumption while not in use, the M4670 contains shutdown circuit current
consumption reduced to less than the reduced 0.01μA. For the closure of trigger point is displayed as a table of
electrical characteristics and typical shutdown hysteresis voltage diagram found in some of the typical performance
characteristics. The best is to switch on the ground and use the smallest current supply, while in the closed state.
The M4670 may be disabled chip off the ground and supply voltage, the idle current is larger than the typical value of
reduced 0.01μA. Total harmonic distortion may increase, but also can be observed when the voltage is less than the
diameter of the shutdown pin in PLAY mode.
There has a resistor connected between GND and Shutdown pins in the M4670 internal, and this resistor is
designed to eliminate any unnecessary state changes, when the Shutdown pin is floating. To minimize the supply
current when the M4670 working in the Shutdown mode, if the M4670 don’t working in the Shutdown mode, the
amount of additional resistor current due to the internal shutdown resistor can be found be Equation (1) below.
(VSD - GND) / 300kΩ (1)
The difference is only 0.5V, the current additional 1.7μA, lots will be drawn, while in the closed state.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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