TDA7570 STMicroelectronics, TDA7570 Datasheet - Page 13

• Manufacturer Part Number: TDA7570
• Manufacturer: STMicroelectronics

Specifications of TDA7570

• Operational Class: Class-AB
• Audio Amplifier Function: Speaker
• Single Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (typ): ±15/±18/±24/±28V
• Power Supply Requirement: Dual
• Power Dissipation: 1.75W
• Rail/rail I/o Type: No
• Single Supply Voltage (min): Not RequiredV
• Single Supply Voltage (max): Not RequiredV
• Dual Supply Voltage (min): ±12V
• Dual Supply Voltage (max): ±30V
• Operating Temp Range: -40C to 150C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 64
• Package Type: HI-QUAD
• Lead Free Status / Rohs Status: Not Compliant

TDA7570
4.4
4.5
4.6
External thermal protection network
Example of external thermal protection circuitry
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Gate driving network
The main purpose of the 27 Ohm resistors Rd-N-L, Rd-P-L, Rd-N-R and Rd-P-R are the
following:
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The R-C snubber network done by:
Are in the direction to increase the dumping (point 1) and reduce the dv/dt (point 2.
The value of these components is also depending on the layout structure. With a reduction
of the parasitic inductance present in the P.C. board layout, in the region around the power
transistors, the value of these components can be reduced, giving advantage in terms of
THD, mainly at mid-high power levels, due to the reduction of the "dead zone".
The minimum suggested value of Rd-x-x is around 10Ω, while, is some cases, Rs-x-x and
Cs-x-x can be removed.
External connections
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Components:
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–
Results (simulations):
–
–
–
1) Dumping of the L-C equivalent circuit done by the parasitic inductance and
capacitance present in the circuit
2) Reduction of the dv/dt of the Vgs and then reduction of the di/dt of the drain current
of the power MOS.
–
–
–
–
CD, THWEXT, THWINT
These pins, if used, it must be connected to a pull-up resistor (>10kΩ) connected to a
supply voltage referred to the receiver device (as example, a μP). Max 10V.
MUTE - To have a soft mute-play and play-mute transition, an R-C network can be
applied (as example 47kΩ, 1μF)
ST-BY - To avoid pop noise due to multiple ST-BY parasitic pulses, an R-C network can
be added (as example 47kΩ, 0.1μF)
+V
a reference voltage comprising between 12V to +Vs.
s
-low - This pin supply the low voltage circuits. It can be connected to the +Vs or to
type: B57621 C621/100k/+
R
External thermal warning temperature intervention: 90 °C
External thermal shut down temperature intervention: 100 °C
External thermal shut down hysteresis: 6 °C
Rs-N-L, Cs-N-L
Rs-P-L, Cs-P-L
Rs-N-R, Cs-N-R
Rs-P-R, Cs-P-R
text
= 10K
Functions, pins and components description
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