TDA7570 STMicroelectronics, TDA7570 Datasheet - Page 12

• 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

Functions, pins and components description
4
4.1
4.2
4.3
Figure 4.
12/17
Typ. Values = 10 – 30 mOhm
(not inductive resistor)
to -Vs
Functions, pins and components description
Components with critical placement and type:
●
●
●
Input capacitors
●
Short circuit protection current calculation
Short circuit protection current diagram (example for the N-channel)
Rsens
Ci-L1, Ci-L2, Ci-R1, Ci-R2 must be placed as near as possible to the sources of the
respective power MOS. If 2 power MOS in parallel are needed, can be useful to place a
couple of capacitors for each couple of power MOS. These capacitors are needed to
absorb the high di/dt current present during the Pchannel/Nchannel and
Nchannel/Pchannel transition that can cause high peak voltages on the power supply
wiring connection due to their parasitic inductance.
The capacitors placed between +Vs to GND and to -Vs are distributed along the power
lines. With P.C. board with very short connections, some of these capacitors can be
avoided (Cvs-1, Cvs-2, Cd3, Cd4, Cd5, Cd6).
The current sensing resistors Rsens-N-L, Rsens-P-L, Rsens-P-R and Rsens-N-R must
be not inductive components, as example, made by a costant an wire.
The value of the input capacitors (Cin-L+, Cin-L-, Cin-R+, Cin-R- depends on the
desired -3dB high pass cutoff frequency, following the formula:
Imos
Vfil = Ispx1 x Rfil = 20mV Typ
Rp1 (typ=4.7kOhm)
Rfil (typ. 100 Ohm)
I
lim
Cfil (typ 2.2nF)
I
lim
=
----------------- - Vpx
Rsens
=
F 3dB
1
----------------- - Vpx
Rsens
(
1
(
)
⎛
⎝
=
------------------------------------------------- -
+
--------------------------------------------- -
6.28 10000 C
Vfil
⋅
(
)
Rp1
⋅
Rp2
Rp2
← if Rp2 is not used
1
+
SPx1 pin
SPx2 pin
Rp2
⋅
Vp=100mV Typ
in
)
comparator
+
Vfil
⎞
⎠
TDA7570
TDA7570