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PDF TDA7387EPAG Data sheet ( Hoja de datos )
| Número de pieza | TDA7387EPAG | |
| Descripción | 4 x 41 W quad bridge car radio amplifier | |
| Fabricantes | STMicroelectronics | |
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TDA7387
4 x 41 W quad bridge car radio amplifier
Datasheet - production data
'!0'03
Flexiwatt25
'!0'03
Flexiwatt25
(Vertical exposed pad)
Features
High output power capability:
– 4 x 41 W / 4 max.
Low distortion
Low output noise
Standby function
Mute function
Automute at min. supply voltage detection
Low external component count:
– Internally fixed gain (26 dB)
– No external compensation
– No bootstrap capacitors
Protections:
– Output short circuit to GND, to VS, across
the load
– Very inductive loads
– Overrating chip temperature with soft
thermal limiter
– Load dump voltage
– Fortuitous open GND
– Reversed battery
– ESD
Description
The TDA7387 is an AB class audio power
amplifier, packaged in Flexiwatt 25 and designed
for high end car radio applications.
Based on a fully complementary PNP/NPN
configuration, the TDA7387 allows a rail to rail
output voltage swing with no need of bootstrap
capacitors. The extremely reduced boundary
components count allows very compact sets.
Order code
TDA7387
TDA7387EP
TDA7387EPAG
Table 1. Device summary
Package
Flexiwatt25
Flexiwatt25 vertical, exposed pad
Flexiwatt25 vertical, exposed pad
Packing
Tube
Tube
Tube
September 2013
This is information on a product in full production.
DocID024094 Rev 2
1/15
www.st.com
1
1 page  
TDA7387
Block and pin connection diagrams
1 Block and pin connection diagrams
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Figure 1. Block diagram
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Figure 2. Pin connection (top view)
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DocID024094 Rev 2
'!0'03
5/15
5 Page 
TDA7387
Application hints
3.3 Standby and muting
Standby and muting facilities are both CMOS-compatible. If unused, a straight connection to
Vs of their respective pins would be admissible. Conventional low-power transistors can be
used to drive muting and stand-by pins in absence of true CMOS ports or microprocessors.
R-C cells have always to be used in order to smooth down the transitions for preventing any
audible transient noises.
Since a DC current of about 10 µA normally flows out of pin 22, the maximum allowable
muting-series resistance (R2) is 70 k, which is sufficiently high to allow a muting capacitor
reasonably small (about 1 µF).
If R2 is higher than recommended, the involved risk is that the voltage at pin 22 may rise to
above the 1.5 V threshold voltage and the device is consequently fails to turn OFF when the
mute line is brought down.
About the stand-by, the time constant to be assigned in order to obtain a virtually pop-free
transition has to be slower than 2.5 V/ms.
3.4 Stability and layout considerations
If properly layouted and hooked to standard car-radio speakers, the TDA7387 is intrinsically
stable with no need of external compensations such as output R-C cells. Due to the high
number of channels involved, this translates into a very remarkable components saving if
compared to similar devices on the market.
To simplify pc-board layout design, each amplifier stage has its own power ground externally
accessible (pins 2,8,18,24) and one supply voltage pin for each couple of them. Even more
important, this makes it possible to achieve the highest possible degree of separation
among the channels, with remarkable benefits in terms of cross-talk and distortion features.
About the layout grounding, it is particularly important to connect the AC-GND capacitor (C5)
to the signal GND, as close as possible to the audio inputs ground: this guarantees high
rejection of any common mode spurious signal.
The SVR capacitor (C6) has also to be connected to the signal GND.
Supply filtering elements (C7, C8) have naturally to be connected to the power-ground and
located as close as possible to the Vs pins.
Pin 1, which is mechanically attached to the device’s tab, needs to be tied to the cleanest
power ground point in the pc-board, which is generally near the supply filtering capacitors.
The exposed pad package doesn't require any particular care compared to the ST standard
flexiwatt package. For particular PCB configurations, in order to maximize the rejection
against any disturbances coming from the battery line (SVR), it is suggested to use one of
the following IC metal slug (heat-sink) connections:
leave the slug simply electrically isolated from the PCB ground;
in case of 2 layers board, connect the slug to the PCB power ground (P-GND) and not
to the signal ground (S-GND);
in case of a PCB with a layer dedicated to grounding (wide / diffused GND area with no
distinction between P-GND and S-GND) connect the slug to the common board
ground.
DocID024094 Rev 2
11/15
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet TDA7387EPAG.PDF ] | |
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