TDA8933BTW/N2,518 NXP Semiconductors, TDA8933BTW/N2,518 Datasheet - Page 9

IC AMP AUDIO 20.6W STER 32TSSOP

TDA8933BTW/N2,518

Manufacturer Part Number
TDA8933BTW/N2,518
Description
IC AMP AUDIO 20.6W STER 32TSSOP
Manufacturer
NXP Semiconductors
Type
Class Dr
Datasheet

Specifications of TDA8933BTW/N2,518

Output Type
1-Channel (Mono) or 2-Channel (Stereo)
Max Output Power X Channels @ Load
20.6W x 1 @ 16 Ohm; 10.3W x 2 @ 8 Ohm
Voltage - Supply
10 V ~ 36 V, ±5 V ~ 18 V
Features
Depop, Differential Inputs, Mute, Short-Circuit and Thermal Protection
Mounting Type
Surface Mount
Package / Case
32-TSSOP Exposed Pad, 32-eTSSOP, 32-HTSSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
935285222518
TDA8933BTW/N2-T
TDA8933BTW/N2-T
NXP Semiconductors
TDA8933B_1
Preliminary data sheet
8.4.2 OverTemperature Protection (OTP)
8.4.3 OverCurrent Protection (OCP)
8.4.4 Window Protection (WP)
8.4.5 Supply voltage protection
This means that the device will not switch off completely, but remains operational at lower
output power levels. With music output signals, this feature enables high peak output
powers while still operating without any external heat sink other than the copper area on
the Printed-Circuit Board (PCB).
If the junction temperature still increases due to external causes the OTP shuts down the
amplifier completely.
If the junction temperature T
The OCP can distinguish between an impedance drop of the loudspeaker and a
low-ohmic short circuit.
If an impedance drop causes the output current to exceed 2 A, e.g. due to dynamic
behavior of the loudspeaker, the amplifier will start limiting the current above 2 A.
Therefore the current limiting feature will avoid audio interruption (audio holes) due to a
loudspeaker impedance drop.
If a fault condition causes the output current to exceed 2 A, like a short circuit between the
loudspeaker terminals or from the loudspeaker terminal to the supply lines or ground, the
amplifier is switched off and a timer of 100 ms is started. The DIAG is set low for the first
50 ms of the timer. The timer will keep the power stage disabled for at least 100 ms.
Every 100 ms the amplifier will try to restart as long as the short circuit between the
loudspeaker terminals remains. The average power dissipation in the TDA8933B will be
low because the short circuit current will flow only during a very short time every 100 ms.
If a short circuit occurs between a loudspeaker terminal and the supply lines or ground,
the activated WP will keep the power stage disabled (no restart every 100 ms). Restart
will take place after removing this short.
The window protection protects the amplifier against the following fault conditions:
If the supply voltage drops below 10 V the UnderVoltage Protection (UVP) circuit is
activated and the system will shut down directly. This switch-off will be silent and without
pop noise. When the supply voltage rises above the threshold level the power stage is
restarted after 100 ms.
During the start-up sequence, when pin POWERUP is switched from Sleep mode to
Mute mode. In the event of a short circuit at one of the output terminals to V
V
for open circuit outputs. Because the check is done before enabling the power stages
no large currents will flow in the event of a short circuit.
When the amplifier is shut down completely due to activation of the OCP or because
of a short circuit to one of the supply lines, then during restart (i.e. after 100 ms) the
window protection will be activated. As a result the amplifier will not start up until the
short circuit to the supply lines has been removed.
SSP1
, V
DDP2
or V
Rev. 01 — 23 October 2008
SSP2
the start-up procedure is interrupted and the TDA8933B waits
j
> 155 C the power stage will shut down immediately.
Class D audio amplifier
TDA8933B
© NXP B.V. 2008. All rights reserved.
DDP1
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