AN7199 Просмотр технического описания (PDF) - Panasonic Corporation

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AN7199

Dual 20 W BTL power IC for car audio

Panasonic Corporation 

ICs for Audio Common Use

s Technical Information (continued)

[2] Main characteristics (continued)

ICQ  VSTB

200

180

160

140

120

100

80

60

40

20

0

0.0

1.0

2.0

VCC = 13.2 V

RL = 4 Ω

Rg = 10 kΩ

3.0

4.0

5.0

Standby voltage VSTB (V)

AN7199Z

250

200

150

100

50

0

−50

−100

−150

−200

−250

0

Voffset  VCC

ch.2

ch.1

ch.2 mute on

ch.1 mute on

RL = 4 Ω

Rg = 10 kΩ

5

10

15

20

Supply voltage VCC (V)

[3] Application note

1. Standby function

1) The power can be turned on or off by

making pin 5 (standby terminal) high

or low.

Table 1

2) The standby terminal has threshold

Terminal state Terminal voltage

Power

voltage of approx. 2.1 V, however, it

has temperature dependency of

approx. − 6 mV/°C. The recommended

range of use is shown in table 1.

Open

Low

High

0V

0 V to 1.0 V

Higher than 3 V

Standby state

Standby state

Operating state

3) The internal circuit of standby terminal is as shown in figure 1. When the standby terminal is high, the current

approximately expressed by the following equation will flow into the circuit.

ISTB =

VSTB−2.7 V

10 kΩ

[mA]

5V

VSTB

0V

5

10 kΩ

Protection Constant

RF circuit

current source

Sub

2 kΩ 4 kΩ

Figure 1

4) A power supply with no ripple component should be used for the control voltage of standby terminal .

11

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