TDA8948J/N1112 데이터 시트보기 (PDF) - NXP Semiconductors.

부품명

상세내역

일치하는 목록

TDA8948J/N1112

4-channel audio amplifier

NXP Semiconductors. 

NXP Semiconductors

TDA8948J

4-channel audio amplifier

8.5 Built-in protection circuits

The TDA8948J contains two types of detection sensors: one measures local temperatures

of the power stages and one measures the global chip temperature. At a local

temperature of approximately 185 °C or a global temperature of approximately 150 °C,

this detection circuit switches off the power stages for 2 ms. High-impedance of the

outputs is the result. After this time period the power stages switch on automatically and

the detection will take place again; still a too high temperature switches off the power

stages immediately. This protects the TDA8948J against shorts to ground, to the supply

voltage and across the load, and against too high chip temperatures.

The protection will only be activated when necessary, so even during a short-circuit

condition, a certain amount of (pulsed) current will still be flowing through the short, just as

much as the power stage can handle without exceeding the critical temperature level.

9. Limiting values

Table 6. Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134).

Symbol Parameter

Conditions

Min

VCC

supply voltage

operating

−0.3

no (clipping) signal [1] −0.3

VI

input voltage

-

−0.3

IORM

repetitive peak output

-

-

current

Tstg

storage temperature

non-operating

−55

Tamb

ambient temperature

-

−40

Ptot

total power dissipation

-

-

VCC(sc)

supply voltage (short circuit) -

-

Max

Unit

+26

V

+28

V

VCC + 0.3 V

4

A

+150

°C

+85

°C

69

W

24

V

[1] The amplifier can deliver output power with non-clipping output signals into nominal loads as long as the

ratings of the IC are not exceeded.

10. Thermal characteristics

Table 7.

Symbol

Rth(j-a)

Rth(j-c)

Thermal characteristics

Parameter

thermal resistance from junction

to ambient

thermal resistance from junction

to case

Conditions

in free air

all channels driven

Typ

Unit

40

K/W

2

K/W

TDA8948J_1

Product data sheet

Rev. 01 — 27 February 2008

© NXP B.V. 2008. All rights reserved.

8 of 26

Share Link: