NXP Semiconductors TFA9810 - Manual

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.
2. Features
■
Stereo full-bridge power comparator for class D audio amplifier applications
■
No external heat sink required
■ Operating voltage range: asymmetrical from 8 V to 20 V
■
Thermally protected
■
Zero dead-time switching
■
Current-limiting (no audible interruptions)
3. Applications
■
Self-oscillating or open-loop class D audio amplifier applications
■
Flat-panel television sets
■ Flat-panel monitors
■
Multimedia systems
■
Wireless speakers
■
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; Figure 33 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 - 35 45 mA
η
po
output power
efficiency output power
2 x 9 W into 8
Ω
;
P
o
= P
o(nom)
87 89 - %