TLE6389-2GV50 Infineon Technologies, TLE6389-2GV50 Datasheet - Page 25

• Manufacturer Part Number: TLE6389-2GV50
• Manufacturer: Infineon Technologies

Specifications of TLE6389-2GV50

• Dc To Dc Converter Type: Step Down
• Number Of Outputs: 1
• Pin Count: 14
• Input Voltage: 5 to 60V
• Output Voltage: 5/7 to 15V
• Output Current: 2.3A
• Package Type: DSO
• Mounting: Surface Mount
• Operating Temperature Classification: Automotive
• Operating Temperature (min): -40C
• Operating Temperature (max): 150C
• Lead Free Status / Rohs Status: Compliant

Datasheet Rev. 2.1
6
In the following, some internal blocks of the TLE6389 are described in more detail. For
the right choice of the external components please refer to the section application
information.
6.1
To meet the strict requirements in terms of current consumption demanded by all Body-
and 42V PowerNet applications a special PFM (Pulse Frequency Modulation) - PWM
(Pulse Width Modulation) control scheme for highest efficiency is implemented in the
TLE 6389 regulators. Under light load conditions the output voltage is able to increase
slightly and at a certain threshold the controller jumps into PFM mode. In this PFM
operation the PMOS is triggered with a certain on time (depending on input voltage,
output voltage, inductance- and sense resistor value) whenever the buck output voltage
decreases to the so called WAKE-threshold. The switching frequency of the step down
regulator is determined in the PFM mode by the load current. It increases with increasing
load current and turns finally to the fixed PWM frequency at a certain load current
depending on the input voltage, current sense resistor and inductance. The diagram
below shows the buck regulation circuit of the TLE 6389 .
Figure 1
The TLE 6389 uses a slope-compensated peak current mode PWM control scheme in
which the feedback or output voltage of the step down circuit and the peak current of the
current through the PMOS are compared to form the OFF signal for the external PMOS.
VREF
VFB
+
-
Amplifier
compensation
Error
Detailed circuit description
PFM/PWM Step-down regulator
Buck control scheme
Slope-
VS
+
+
-
CS
Amplifier
Current-
sense
VFB, WK
VREF
SYNC
Comparator
PWM
Oscillator
-
Blanking
Comparator
VFB, OV
Wake-
25
+
-
VREF
PFM
PWM
Lockout
MODE
MUX
Voltage
Over-
>1
VREF
R
S
Q
+
-
VDIODE
Shutdown
&
Temp.
Over-
Level-
shift
TLE 6389
2007-08-13
BDS
VS
GDRV