Overview

The LA4708 is a BTL two-channel power IC for car audio developed in pursuit of excellent sound quality. Low-region frequency characteristics have been improved through the use of a new NF capacitorless circuit, and crosstalk which causes ‘‘muddy’’ sound has been reduced by improving both circuit and pattern layout. As a result, the LA4708 provides powerful bass and clear treble. In addition, the LA4708 features on-chip protectors and standby switch. The LA4708 is also pin-compatible with the LA4705NA (car stereo-use 17 W two-channel power IC), and can be substituted for the LA4705NA for higher power. (When the board is shared, pins 1 and 9 must be left open.)

Features

.High power: supports total output of 30 W + 30 W

(VCC= 13.2 V, THD = 30%, RL=4Ω)

.Supports RL=2Ω(PO= 30 W when VCC= 13.2 V, THD = 10%)

.Designed for excellent sound quality (fL< 10 Hz, fH= 130 kHz)

.NF capacitorless

.Any on time settable by external capacitor

.Less pop noise

.Standby switch circuit on chip (microprocessor supported)

.Various protectors on chip

(output-to-ground short/output-to-VCCshort/

load short/overvoltage/thermal shutdown circuit)