Nxp Semiconductors TFA9810 ユーザーズマニュアル
1.
General description
The TFA9810 is a two-channel power comparator for high-efficiency class D audio
amplifier systems. It contains two full-bridge Bridge-Tied Load (BTL) power stages, drive
logic, protection control logic and full differential input comparators. By using this power
comparator a compact closed-loop self-oscillating digital amplifier system or open-loop
system can be built. The TFA9810 does not require a heat sink and operates using an
asymmetrical supply voltage.
amplifier systems. It contains two full-bridge Bridge-Tied Load (BTL) power stages, drive
logic, protection control logic and full differential input comparators. By using this power
comparator a compact closed-loop self-oscillating digital amplifier system or open-loop
system can be built. The TFA9810 does not require a heat sink and operates using an
asymmetrical supply voltage.
2.
Features
n
Stereo full-bridge power comparator for class D audio amplifier applications
n
No external heat sink required
n
Operating voltage range: asymmetrical from 8 V to 20 V
n
Thermally protected
n
Zero dead-time switching
n
Current-limiting (no audible interruptions)
3.
Applications
n
Self-oscillating or open-loop class D audio amplifier applications
n
Flat-panel television sets
n
Flat-panel monitors
n
Multimedia systems
n
Wireless speakers
n
High-end CRT television sets
4.
Quick reference data
TFA9810
Stereo full-bridge audio amplifier 2 x 12 W
Rev. 03 — 20 February 2008
Product data sheet
Table 1.
Quick reference data
T
amb
= 25
°
C; V
P
= 12 V; f
osc
= 550 kHz;
unless otherwise specified
Symbol
Parameter
Condition
Min
Typ
Max
Unit
V
P
supply voltage
V
P
= V
DDPx
−
V
SSPx
8
12
20
V
I
off
off-state current
off mode
-
110
200
µ
A
I
q
quiescent current
with load, filter and
snubbers connected
snubbers connected
-
35
45
mA
η
po
output power
efficiency
efficiency
output power
2 x 9 W into 8
2 x 9 W into 8
Ω
;
P
o
= P
o(nom)
87
89
-
%