TDA7564BPD STMicroelectronics, TDA7564BPD Datasheet - Page 20

• Manufacturer Part Number: TDA7564BPD
• Description: IC AMP QUAD MULTIFUNC POWERSO36
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TDA7564BPD

• Output Type: 4-Channel (Quad)
• Max Output Power X Channels @ Load: 75W x 4 @ 2 Ohm
• Voltage - Supply: 8 V ~ 18 V
• Features: I²C, Mute, Short-Circuit and Thermal Protection, Standby
• Mounting Type: Surface Mount
• Package / Case: PowerSO-36 Exposed Top Pad
• Operational Class: Class-AB
• Audio Amplifier Output Configuration: 4-Channel Stereo
• Output Power (typ): 75x4@2OhmW
• Audio Amplifier Function: Speaker
• Input Offset Voltage: 100mV
• Single Supply Voltage (typ): 14V
• Dual Supply Voltage (typ): Not RequiredV
• Power Supply Requirement: Single
• Power Dissipation: 85W
• Rail/rail I/o Type: No
• Single Supply Voltage (min): 8V
• Single Supply Voltage (max): 18V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -55C to 150C
• Operating Temperature Classification: Military
• Mounting: Surface Mount
• Pin Count: 36
• Package Type: PowerSO SLUG UP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Thermal protection
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Thermal protection
Thermal protection is implemented through thermal foldback
Thermal foldback begins limiting the audio input to the amplifier stage as the junction
temperatures rise above the normal operating range. This effectively limits the output power
capability of the device thus reducing the temperature to acceptable levels without totally
interrupting the operation of the device.
The output power will decrease to the point at which thermal equilibrium is reached.
Thermal equilibrium will be reached when the reduction in output power reduces the
dissipated power such that the die temperature falls below the thermal foldback threshold.
Should the device cool, the audio level will increase until a new thermal equilibrium is
reached or the amplifier reaches full power. Thermal foldback will reduce the audio output
level in a linear manner.
Three thermal warning are available through the I
Figure 29. Thermal foldback diagram
I
A correct turn on/off sequence respectful of the diagnostic timings and producing no audible
noises could be as follows (after battery connection):
Turn-on: (standby out + diag enable) --- 500 ms (min.) --- muting out
Turn-off: muting in --- 20 ms --- (diag disable + standby in)
Car radio Installation: diag enable (write) --- 200 ms --- I
disappear).
AC test: feed h.f. tone -- AC diag enable (write) --- wait > 3 cycles --- I
(repeat I
Offset test: device in play (no signal) -- offset enable - 30ms - I
(repeat I
2
C programming/reading sequences
2
2
C reading until tweeter-off message disappears).
C reading until high-offset message disappears).
CD out
Vout
Vout
TH. WARN.
125°
ON
Doc ID 12734 Rev 3
TH. WARN.
< T
140°
ON
SD
TH. WARN.
155°
ON
TH. SH.
START
> T
2
SD
C bus data.
(with same input
signal)
2
C read (repeat until all faults
TH. SH.
END
(Figure
2
C reading
Tj ( °C)
Tj ( °C)
Tj ( °C)
29).
2
C read
TDA7564B