TLE6368 Infineon Technologies, TLE6368 Datasheet - Page 8

• Manufacturer Part Number: TLE6368
• Description: Multi-Voltage Processor Power Supply
• Manufacturer: Infineon Technologies

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Data Sheet, Rev. 1.32
2
In the following major buck regulator blocks, the linear voltage regulators and trackers,
the undervoltage reset function, the watchdog and the SPI are described in more detail.
For applications information e.g. choice of external components, please refer to section
5.
2.1
The diagram below shows the internal implemented circuit of the Buck converter, i. e. the
internal DMOS devices, the regulation loop and the other major blocks.
Figure 3 Detailed Buck regulator diagram
The 1.5A Buck regulator consists of two internal DMOS power stages including a current
mode regulation scheme to avoid external compensation components plus additional
blocks for low EME and reduced switching loss. Figure 3 indicates also the principle how
FB/L_IN
from
current sensing
Vref=6V
SLEW
Detailed circuit description
Buck Regulator
5V
feedback
amplifier
amplifier
Voltage
Current
sense
Oscillator
1.4MHz
control
Slope
Int. voltage
regulator
C+
C-
Divider
+
Lowpass
Lowpass
8 to 10V
CCP
Int. charge
pump
150µA
14V
comparator
Slope
compensation
Current
switching frequency 330kHz
external components
Gate off signal
from overtemp or
sleep command
Trigger for
gate off
BOOT-
STRAP
PWM logic
8
Trigger for
gate on
SW
Main switch ON/OFF
pins
Slope logic
Delay unit
Slope switch
charge signal
Slope switch
discharge signal
Gate driver
voltage
lockout
under-
Zero cross
detection
TLE 6368 / SONIC
current sense
amplifier
to
DMOS
DMOS
Slope
2004-10-15
Main
BOOST
SW
IN
IN