參數(shù)資料
型號(hào)： 935083750112
廠商： NXP SEMICONDUCTORS
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PSFM9
封裝： PLASTIC, SIP-9
文件頁(yè)數(shù)： 24/28頁(yè)
文件大?。?/td> 240K
代理商： 935083750112
July 1994
5
Philips Semiconductors
Product specication
Multiple output voltage regulator
TDA3602
PINNING
SYMBOL
PIN
DESCRIPTION
VP
1
positive supply voltage
REG1
2
Regulator 1 output
RESET
3
reset output
Vsc
4
state control input
HOLD
5
hold output
GND
6
ground
REG3
7
Regulator 3 output
Vbu
8
back-up
REG2
9
Regulator 2 output
handbook, halfpage
MCD345
1
2
3
4
5
6
7
8
9
P
V
GND
REG1
REG3
REG2
TDA3602
sc
V
bu
V
RESET
HOLD
Fig.2 Pin configuration.
FUNCTIONAL DESCRIPTION
This multiple output voltage regulator contains three fixed
voltage regulators, numbered 1, 2 and 3. Two of these can
be switched between the on and off states using the state
control pin (pin 4). The third (Regulator 3), which is
continuously in, can be switched by the state control pin
between a low and a high current mode.
In addition to Regulators 1 and 2, the device is supplied by
an internal switch that is open when the supply voltage
falls below the back-up voltage (negative field decay or
engine start procedure), or during a load dump. (During
this load dump, Regulators 1 and 2 are switched off and
RESET is switched LOW). This switched supply voltage
(the so-called back-up voltage (Vbu), is available at pin 8.
An electrolytic capacitor can be connected to this pin, and
the charge on this capacitor can be used to supply the
device for a short period after the supply voltage is
removed.
Three pins are provided for interfacing with a
microprocessor:
state control pin
hold output pin
reset output pin.
When the supply voltage (VP) is connected to the device,
Vbu will rise. When Vbu reaches 7.9 V, the device is in the
power-on mode. The RESET output goes HIGH and
Regulator 3 is switched on. In a microprocessor
application, the RESET output can be used to call up the
CPU and to initialize the program.
What follows depends on the voltage at the state control
pin (Vsc). In most applications, when the supply voltage is
connected, Vsc will rise slowly (e.g. by charging a
capacitor).The device will leave the power-on mode and
enter the reset mode when Vsc rises above 2.2 V. In both
the power-on and reset modes, Regulator 3 will be in the
high current mode, Regulators 1 and 2 will be switched off
and the RESET output will be HIGH.
The device will enter the wake mode when Vsc reaches 2.8
V. The RESET pin will go LOW and the CPU must be
switched to the sleep mode. Regulator 3 is still in the high
current mode.
As Vsc continues rising and the voltage reaches 3.6 V, the
stabilizer will be switched into the sleep mode. It will be in
a coma mode when Vsc is greater than 3.8 V. In this mode,
only the relevant circuits remain operating; this is to keep
the power consumption as low as possible i.e. typically 290
A.
If the device is switched on with Vsc already higher than 3.8
V, the device will be switched directly from the power-on
mode into the coma mode.
When Vsc is lowered gradually from 3.6 V (or higher) to 2
V, the device will go from sleep to reset again.
Vsc must be lower than 1.1 V to bring the device into the on
mode; note that this is not the same as the power-on
mode. In this condition, Regulator 3 is in the high current
mode, both Regulators 1 and 2 are switched on and the
HOLD output will be HIGH (depending on the state of VP
and the in-regulation condition of Regulators 1 and 2).
相關(guān)PDF資料
PDF描述
935139740112 DUAL COMPARATOR, 4000 uV OFFSET-MAX, 1300 ns RESPONSE TIME, PDIP8
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