FAB3103 datasheet(8/13 Pages) FAIRCHILD

Part #	FAB3103

Description	2.3 Watt Class-D Audio Amplifier with Integrated Boost Regulator and Automatic Gain Control

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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FAB3103 • Rev. 1.0.2

8

Figure 9. Auto Boost Startup

Automatic Gain Control

Due to constant output power, the amount of VBATT

current needed to maintain a given output amplitude is

inversely proportional to VBATT voltage. This produces

very large current requirements at low VBATT. The AGC

eases low-VBATT current demands by reducing the gain

when VBATT voltage drops below a trip point. One of

three different trip points may be selected by shorting

AGCT to VBATT, shorting AGCT to PGND, or floating

AGCT (see Electrical Characteristics)

.

The trip point is determined upon power-on and when

EN transitions from LOW to HIGH. If AGCT is changed

during operation, the new value is not read until power

or EN is cycled.

When VBATT is above the trip point, the AGC has no

effect on the signal path.

When VBATT is at or below the trip point, target gain is

reduced in 0.5dB steps according to the equation:

















max

arg

out

batt

T

I

L

I

et

t

V

G

S

G

(1)

where:

GI

= Initial gain (10V/V);

SL

= 3V/V slope;

VOUTMAX = 5.2V;

VT

= AGC trip point set by the AGCT pin; and

VBATT

= Voltage at the VBATT pin.

Target gain can be reduced by as much as 10dB.

Note that the state of auto boost shutdown has no effect

on the AGC.

Figure 10 shows target gain vs. battery voltage.

0

0.2

0.4

0.6

0.8

0

20

40

60

80

100

120

140

160

180

200

0.0

2.0

4.0

6.0

0

20

40

60

80

100

120

140

160

180

200

0.0

0.5

1.0

1.5

2.0

2.5

0

20

40

60

80

100

120

140

160

180

200

Time (µs)

Boost Converter Peak Input Current Limit

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