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參數(shù)資料
| 型號： | TLE6711G |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO14 |
| 封裝： | PLASTIC, SOP-14 |
| 文件頁數(shù)： | 4/25頁 |
| 文件大小： | 963K |
| 代理商： | TLE6711G |
Data Sheet
12
Rev. 3.4, 2007-08-16
TLE 6711
Circuit Description
The TLE 6711 G/GL is also protected against several boost loop errors:
In case of a feedback interruption a pull-up current source (
I
FB typ. 0.4 A), integrated at pin BOFB pulls the
voltage at the feedback pin BOFB above the reference voltage. The boost output is switched off by the high error
voltage which controls the PWM-Comparator at a zero duty cycle.
In the case of a resistive loop error caused by leakage currents to ground, the boost output voltage would increase
to very high values. In order to protect the
V
BOOST input as well as the external load against catastrophic failures,
an overvoltage protection is provided which switches the output transistor off as soon as the voltage at pin
V
BOOST
exceeds the internal fixed overvoltage threshold
V
BOOVOFF = typ. 37 V.
Application Note
A short circuit from
V
BOOST to ground will not destroy the IC, however, it may damage the external boost diode or
the boost inductance if there is no overcurrent limitation in that path.
Figure 9
Most Important Waveforms of the Boost Converter Circuit
AED02672
t
C
V
Error
V
and
V
CV
CP
V
t
L
H
OCLK
PWM
L
H
t
I
BOI
BOLI
I
DBO
I
t
BOI
V
t
BOOST
V
S
V
Overcurrent Threshold Exceeded
Controlled by the
Load-Current Increasing with Time;
Error Voltage
Overcurrent Comp
Controlled by the Error Amp
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