TDA8933T NXP Semiconductors, TDA8933T Datasheet - Page 10

• Manufacturer Part Number: TDA8933T
• Description: Audio Amplifiers 2X10W BTL CLASS D AMP+VOLCTRL
• Manufacturer: NXP Semiconductors

Specifications of TDA8933T

• Product: Class-D
• Output Power: 32 W
• Available Set Gain: 36 dB
• Common Mode Rejection Ratio (min): 75 dB
• Thd Plus Noise: 0.011 %
• Operating Supply Voltage: 25 V
• Supply Current: 0.6 mA
• Maximum Power Dissipation: 5000 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Audio Load Resistance: 16 Ohms
• Dual Supply Voltage: +/- 12.5 V
• Input Signal Type: Differential
• Minimum Operating Temperature: - 40 C
• Output Signal Type: Differential, Single
• Supply Type: Single or Dual
• Supply Voltage (max): 36 V
• Supply Voltage (min): 10 V
• Output Type: 1-Channel Mono or 2-Channel Stereo
• Package / Case: SOIC-32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: TDA8933T/N1,112

NXP Semiconductors
TDA8933_1
Preliminary data sheet
8.4.1 Thermal Foldback (TF)
8.4.2 OverTemperature Protection (OTP)
8.4.3 OverCurrent Protection (OCP)
8.4.4 Window Protection (WP)
8.4.5 Supply voltage protections
If the junction temperature of the TDA8933 exceeds the threshold level (T
gain of the amplifier is decreased gradually to a level where the combination of
dissipation (P) and the thermal resistance from junction to ambient (R
junction temperature around the threshold level.
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 printed-circuit
board area.
If the junction temperature still increases due to external causes, the OverTemperature
Protection (OTP) shuts down the amplifier completely.
If the junction temperature T
When the output current of the device exceeds 2 A due to a short-circuit across the load
or an impedance drop, the cycle-by-cycle current limitation becomes active. This means
the device will not switch off, but continue to operate while limiting the current without
causing audio holes (interruptions). The maximum output current will not go beyond the
absolute maximum current.
If the current exceeds 2 A due to a low ohmic short from the demodulated output (after the
inductor) to either V
50 ms and the internal timer of 100 ms is started. The timer will keep both power stages
disabled for 100 ms. As long as the short remains, this cycle will repeat. The average
power dissipation in the TDA8933 will be low because the short-circuit current will flow
only during a very small part of the timer cycle of 100 ms.
WP checks the PWM output voltage before switching from Sleep mode to Mute mode
(outputs switching) and is activated:
If the supply voltage drops below 10 V, the 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 system is restarted again 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
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 because a
short to one of the supply lines is made, then during restart (after 100 ms) the window
protection will be activated. As a result, the amplifier will not start up until the short to
the supply lines is removed.
SSP2
the start-up procedure is interrupted and the TDA8933 waits for open-circuit
SS
or V
Rev. 01 — 15 May 2007
DD
j
> 155 C, the power stage will shut down immediately.
both power stages become floating. The DIAG is set low for
Class-D audio amplifier
DDP1
th(j-a)
TDA8933
© NXP B.V. 2007. All rights reserved.
, V
j
) results in a
> 140 C), the
SSP1
, V
DDP2
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or