參數(shù)資料
型號(hào)： TDA8920TH/N1,118
廠(chǎng)商： NXP SEMICONDUCTORS
元件分類(lèi)： 音頻／視頻放大
英文描述： 80 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24
封裝： PLASTIC, SOT-566-3, HSOP-24
文件頁(yè)數(shù)： 10/36頁(yè)
文件大小： 733K
代理商： TDA8920TH/N1,118
2002 Sep 25
18
Philips Semiconductors
Product specication
2
× 80 W class-D power amplier
TDA8920
To trigger the maximum current protection in the
TDA8920, the required output current must exceed 7.5 A.
This situation occurs in case of:
Short-circuits from any output terminal to the supply
lines (VDD or VSS)
Short-circuit across the load or speaker impedances or
a load impedance below the specified values of
4 and 8
.
Even if load impedances are connected to the amplifier
outputs which have an impedance rating of 4
, this
impedance can be lower due to the frequency
characteristic of the loudspeaker; practical loudspeaker
impedances can be modelled as an RLC network which
will have a specific frequency characteristic: the
impedance at the output of the amplifier will vary with the
input frequency. A high supply voltage in combination with
a low impedance will result in large current requirements.
Another factor which must be taken into account is the
ripple current which will also flow through the output power
switches. This ripple current depends on the inductor
values which are used, supply voltage, oscillator
frequency, duty factor and minimum pulse width. The
maximum available output current to drive the load
impedance can be calculated by subtracting the ripple
current from the maximum repetitive peak current in the
output pin, which is 7.5 A for the TDA8920TH.
As a rule of thumb the following expressions can be used
to determine the minimum allowed load impedance
without generating audio holes:
SE application.
BTL application.
Legend:
ZL = load impedance
fosc = oscillator frequency
tmin = minimum pulse width (typical 190 ns)
VP = single-sided supply voltage
(so if the supply =
±30 V symmetrical → VP =30V)
IORM = maximum repetitive peak current in output pin;
see also Chapter 9
Iripple = ripple current.
16.7
Pumping effects
The TDA8920 class-D amplifier is supplied by a
symmetrical voltage (e.g VDD = +25 V, VSS = 25 V).
When the amplifier is used in a Single-Ended (SE)
configuration a so-called ‘pumping effect’ can occur.
During one switching interval energy is taken from one
supply (e.g. VDD), while a part of that energy is delivered
back to the other supply line (e.g. VSS) and visa versa.
When the voltage supply source cannot sink energy the
voltage across the output capacitors of that voltage supply
source will increase: the supply voltage is pumped to
higher levels.
The voltage increase caused by the pumping effect
depends on:
Speaker impedance
Supply voltage
Audio signal frequency
Capacitor value present on supply lines
Source/sink currents of other channels.
The pumping effect should not cause a malfunction of
either the audio amplifier and/or the voltage supply source.
For instance, this malfunction can be caused by triggering
of the undervoltage or overvoltage protection or unbalance
protection of the amplifier.
16.8
Reference design
The reference design for the single-chip class-D audio
amplifier for TDA8920TH is illustrated in Fig.9. The
Printed-Circuit Board (PCB) layout is shown in Fig.10. The
Bill Of Materials (BOM) is given in Table 1.
16.9
PCB information for HSOP24 encapsulation
The size of the printed-circuit board is 74.3
× 59.10 mm,
dual sided 35
m copper with 121 metallized through
holes.
The standard configuration is a symmetrical supply (typical
±25 V) with stereo SE outputs (typical 2 × 4 ).
The PCB is also suitable for mono BTL configuration
(1
× 8 ) also for symmetrical supply and for asymmetrical
supply.
It is possible to use several different output filter inductors
such as 16RHBP or EP13 types to evaluate the
performance against the price or size.
16.10 Classication
The application shows optimized signal and EMI
performance.
Z
L
V
P 1tmin fosc
–
()
I
ORM
I
ripple
–
----------------------------------------
0.6
–
≥
Z
L
2V
P 1tmin fosc
–
()
I
ORM
I
ripple
–
--------------------------------------------
1.2
–
≥
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