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NXP Semiconductors TFA9810 User Manual

Tfa9810, General description, Features

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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

;

P

o

= P

o(nom)

87

89

-

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