TLE6363 Datasheet, PDF (17/28 Pages) Infineon Technologies AG – Multifunctional Voltage Regulator and Watchdog

TLE 6363
OV
COMP _{L when NAND 3}
OV at V_{Boost &}
= V_thOV
38 V
L when
T_j > 175 ˚C
GND
V_Boost
V_thUV
4V
=
UV
COMP
+
-
H when
V_Boost < 4 V
H when
Overcurrent
GND
I _Pullup
H when
T_j > 175 ˚C
or OV at V_Boost
NOR 1
1
Error
Gate
L when
Error
Error-FF
R& _Q
H when NOR 2
Error
1
NAND1
&
&
S
Q
PWM-FF
R& _Q
H = ^INV
OFF 1
NAND 2
&
&
S
Q
H=
ON
Gate
Driver
BOI
Pin 14
Power
D-MOS
10 µA
BOFB
Pin 12
V_REF
2.8 V
=
Error
AMP
+
-
Error-Signal
Error-Ramp
PWM
COMP
H when
Error-Signal
<
Error-Ramp
OC
COMP
V_thOC
18 mV
R_Sense
14.5 mΩ
BOGND
Pin 13
GND
R
Pin 1
Oscillator
V_max
V_min
t_r t_f t_{r t}
Schmitt-trigger 1
Ramp Vhigh
V_low
t_r t_f t_r
t ^Clock
Unlock
Detector
H when Outputcurrent > 1.2 A
OVL
Boost Status ^{Pin 11}
Low if Battery
Disconnected
GND
AEB02946
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.
Data Sheet V 1.1
17
2000-11-8