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參數(shù)資料
型號(hào): TLE6363G
廠商: INFINEON TECHNOLOGIES AG
元件分類: 穩(wěn)壓器
英文描述: DUAL SWITCHING CONTROLLER, 115 kHz SWITCHING FREQ-MAX, PDSO14
封裝: PLASTIC, DSO-14
文件頁(yè)數(shù): 9/28頁(yè)
文件大小: 765K
代理商: TLE6363G
Data Sheet Rev. 1.2
17
2003-06-02
TLE 6363
Figure 6
Boost Converter Block Diagram
Figure 7 shows the most important waveforms during operation; for low, medium and
high loads up to overload condition. The output transistor is switched off immediately if
the overcurrent comparator detects an overcurrent level at the power DMOS or if the
sense output switches to low induced by a
V
BOOST undervoltage command.
The TLE 6363 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.
AEB02946
Pin 1
R
V
min
t
f
r t
r
t
Oscillator
V
max
V
low
t
r
t
r
f t
high
Schmitt-trigger 1
Ramp V
t
Clock
Error-Ramp
Error-Signal
PWM
COMP
+
-
Error-Ramp
Error-Signal
H when
<
=
V
GND
2.8 V
REF
Error
-
+
AMP
Pin 12
BOFB
Pullup
I
A
10
=
GND
COMP
+
-
UV
4 V
thUV
V
Boost
V
GND
thOV
38 V
V
=
COMP
OV
-
+
NOR 1
1
&
OV at
L when
Boost
V
NAND 3
L when
> 175 C
T
j
H when
Overcurrent
H when
< 4 V
Boost
V
H when
> 175 C
j
T
V
or OV at Boost
NAND1
&
Error-FF
&
R
Q
S
Q
L when
Error
NOR 2
1
Error
H when
Error
Gate
Unlock
Detector
NAND 2
&
Q
R
&
S
Q
&
PWM-FF
H =
OFF
H =
ON
1
INV
D-MOS
Power
Gate
Driver
+
COMP
-
OC
V
thOC
18 mV
=
Sense
14.5 m
R
Pin 13
BOGND
H when Outputcurrent > 1.2 A
OVL
Pin 11
GND
BOI
Pin 14
Boost Status
Low if Battery
Disconnected
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