參數(shù)資料
型號(hào)： TDA8589BJ
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： I2C-bus controlled 4 45 Watt power amplifier and multiple voltage regulator
中文描述： SPECIALTY CONSUMER CIRCUIT, PZFM37
封裝： PLASTIC, SOT725-1, 37 PIN
文件頁(yè)數(shù)： 11/55頁(yè)
文件大?。?/td> 561K
代理商： TDA8589BJ
2004 Feb 24
11
Philips Semiconductors
Product speci
cation
I
2
C-bus controlled 4 45 Watt power
ampli
er and multiple voltage regulator
TDA8589J; TDA8589xJ
VOLTAGE REGULATORS
The voltage regulator section contains:
Four switchable regulators and one permanent active
regulator
Two power switches with loss-of-ground protection
Reset push-pull output
Backup functionality.
The quiescent current condition has a very low current
level of 150 A typical with only regulator 2 active. The
TDA8589 uses low dropout voltage regulators for use in
low voltage applications.
All of the voltage regulators except for the standby
regulator can be controlled via the I
2
C-bus. The voltage
regulator section of this device has two power switches
which are capable of delivering unregulated 400 mA
continuous current, and has several fail-safe protection
modes. It conforms to peak transient tests and protects
against continuous high voltage (24 V), short-circuits and
thermal stress. A reset warning signal is asserted if
regulator 2 is out of regulation. Regulator 2 will try to
maintain output for as long as possible even if a thermal
shut-down or any other fault condition occurs. During
overvoltage stress conditions, all outputs except
regulator 2 will switch off and the device will be able to
supply a minimum current for an indefinite amount of time
sufficient for powering the memory of a microcontroller.
Provision is made for an external reserve supply capacitor
to be connected to pin BUCAP which can store enough
energy to allow regulator 2 to supply a microcontroller for
a period long enough for it to prepare for a loss-of-voltage.
Regulator 2
Regulator 2 is intended to supply the microcontroller and
has a low quiescent current. This supply cannot be shut
down in response to overvoltage stress conditions, and is
notI
2
C-bus controllable topreventthemicrocontroller from
being damaged by overvoltage which could occur during a
disturbance of the I
2
C-bus. This supply will not shut down
during load dump transients or during a high
thermal-protection condition.
Backup capacitor
The backup capacitor is used as a backup supply for the
regulator 2 output when the battery supply voltage (V
P
)
cannot support the regulator 2 voltage.
Backup function
The backup function is implemented by a switch function,
which behaves like an ideal diode between pins V
P
and BUCAP; the forward voltage of this ideal diode
depends on the current flowing through it. The backup
function supplies regulator 2 during brief periods when no
supply voltage is present on pin V
P
. It requires an external
capacitor to be connected to pin BUCAP and ground.
When the supply voltage is present on pin V
P
this
capacitorwill be charged to a levelofV
P
supply voltage is absent from pin V
P
, this charge can then
be used to supply regulator 2 for a brief period (t
backup
)
calculated using the formula:
0.3 V. When the
Example: V
P
= 14.4 V, V
O(REG2)
= 5 V, R
L
= 1 k and
C
backup
= 100 F provides a t
backup
of 177 ms.
When an overvoltage condition occurs, the voltage on
pin BUCAP is limited to approximately 24 V; see Fig.5.
t
backup
C
backup
R
L
V
---------------V
V
O REG2
0.5
–
–
=
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