參數(shù)資料
型號： TAS5186DKD
廠商： Texas Instruments, Inc.
英文描述： 6-Channel, 210-W, Digital-Amplifier Power Stage
中文描述： 6通道，210鎢，數(shù)字放大器功率級
文件頁數(shù)： 13/17頁
文件大?。?/td> 349K
代理商： TAS5186DKD
www.ti.com
Device Protection System
OVERCURRENT (OC) PROTECTION WITH
CURRENT LIMITING AND OVERLOAD DE-
TECTION
The device has independent, fast-reacting current
detectors with programmable trip threshold (OC
threshold) on all high-side and low-side power-stage
FETs. See the following table for OC-adjust resistor
values. The detector outputs are closely monitored by
TAS5186
SLES136–MAY 2005
Any fault resulting in device shutdown is signaled by
the SD pin going low. Likewise, OTW goes low when
the device junction temperature exceeds 125°C (see
the following table).
two protection systems. The first protection system
controls the power stage in order to prevent the
output current from further increasing. I.e., it performs
a current-limiting function rather than prematurely
shutting down during combinations of high-level mu-
sic transients and extreme speaker load-impedance
drops. If the high-current situation persists, i.e., the
power stage is being overloaded, a second protection
system triggers a latching shutdown, resulting in the
power stage being set in the high-impedance (Hi-Z)
state.
SD
0
OTW
0
DESCRIPTION
Overtemperature (OTE) or overload (OLP) or
undervoltage (UVP)
Overload (OLP) or undervoltage (UVP)
Overtemperature warning. Junction temperature
higher than 125°C, typical
Normal operation. Junction temperature lower than
125°C, typical
0
1
1
0
For
programmable within a limited range using a single
external resistor connected between the OC_ADJ pin
and AGND.
added
flexibility,
the
OC
threshold
is
1
1
It should be noted that asserting RESET low forces
the SD and OTW signals high independently of faults
being present. It is recommended to monitor the
OTW signal using the system microcontroller and to
respond to an overtemperature warning signal by,
e.g., turning down the volume to prevent further
heating of the device that would result in device
shutdown (OTE). To reduce external component
count, an internal pullup resistor to 3.3 V is provided
on both the SD and OTW outputs. Level compliance
for 5-V logic can be obtained by adding external
pullup resistors to 5 V (see the
Electrical Character-
istics
section of this data sheet for further specifi-
cations).
OC-Adjust Resistor Values
(k
)
15
18
Maximum Current Before OC
Occurs (A)
5 (sat.), 8 (sub.)
4.5 (sat.), 7.5 (sub.)
It should be noted that a properly functioning
overcurrent detector assumes the presence of a
properly
designed
demodulation
power-stage output. Short-circuit protection is not
provided directly at the output pins of the power stage
but only on the speaker terminals (after the demodu-
lation filter). It is required to follow certain guidelines
when selecting the OC threshold and an appropriate
demodulation inductor.
For the lowest-cost bill of materials in terms of
component selection, the OC threshold current
should be limited, considering the power output
requirement
and
minimum
Higher-impedance loads require a lower OC
threshold.
The demodulation filter inductor must retain at
least 5
μ
H of inductance at twice the OC
threshold setting.
filter
at
the
The TAS5186 contains advanced protection circuitry
carefully designed to facilitate system integration and
ease of use, as well as safeguarding the device from
permanent failure due to a wide range of fault
conditions
such
as
short
undervoltage. The TAS5186 responds to a fault by
immediately
setting
the
high-impedance state (Hi-Z) and asserting the SD pin
low. In situations other than overload, the device
automatically recovers when the fault condition has
been
removed,
e.g.,
the
increasedor
the
temperature
highest possible reliability, recovering from an over-
load fault requires external reset of the device no
sooner than 1 second after the shutdown (see the
Device Reset
section of this data sheet).
load
impedance.
circuit,
overload,
and
power
stage
in
a
Most inductors have decreasing inductance with in-
creasing
temperature
and
(saturation). To some degree, an increase in tem-
perature naturally occurs when operating at high
output currents, due to inductor core losses and the
dc resistance of the inductor copper winding. A
thorough analysis of inductor saturation and thermal
properties is strongly recommended.
increasing
current
supply
has
voltage
dropped.
has
For
Setting the OC threshold too low might cause issues
such as lack of output power and/or unexpected
shutdowns due to sensitive overload detection.
In general, it is recommended to follow closely the
external component selection and PCB layout as
given in the application section.
13
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