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參數(shù)資料
| 型號： | TLE6363G |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | Multifunctional Voltage Regulator and Watchdog |
| 中文描述： | 多功能穩(wěn)壓器和看門狗 |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 278K |
| 代理商： | TLE6363G |
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TLE 6363
Data Sheet V 1.1
16
2000-11-8
Boost Converter
The TLE 6363 contains a fully integrated boost converter (except the boost-diode),
which provides a supply voltage for an energy reserve e.g. an airbag firing system. The
regulated boost output voltage
V
BOOST
is programmable by a divider network (external
resistors) providing the feedback voltage for the boost feedback pin BOFB. The energy
which is stored in the external electrolytic capacitor at
V
BOOST
guarantees accurate
airbag firing, even if the battery is disconnected by a car crash.
The boost inductance
L
BO
(typ. 100
←
H) is PWM-switched by an integrated current
limited power DMOS transistor with a programmable (external resistor
R
R
) frequency.
An internal bandgap reference provides a temperature independent, on chip trimmed
reference voltage for the regulation loop. An error amplifier compares the reference
voltage with the boost feedback signal
V
BOFB
from the external divider network
(determination of the output boost voltage
V
BOOST
).
Application note for programming the output voltage at pin
V
BOOST
:
With a PWM (Pulse Width Modulation) comparator the output of the error amplifier is
compared to a periodic linear ramp, provided by a sawtooth signal of the oscillator
connected to pin R. A logic signal with variable pulse width is generated. It passes
through the logic circuits (sets the output latch PWM-FF) and driver circuits to the power
switching DMOS. The Schmitt-trigger output resets the output flip-flop PWM-FF by
NOR 2. The PWM signal is gated by the NAND 2 to guarantee a dominant reset.
V
BOOST
V
BOFBTH
R
------------------------------------
R
+
Ε
Φ
R
BO2
=
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