TLE6389-3GV50 Infineon Technologies, TLE6389-3GV50 Datasheet - Page 31

• Manufacturer Part Number: TLE6389-3GV50
• Manufacturer: Infineon Technologies

Specifications of TLE6389-3GV50

• 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
7.8
The TLE 6389’s internal oscillator is set for a fixed PWM switching frequency of 360kHz
or can be synchronized to an external clock at the SYNC pin. When the internal clock is
used SYNC has to be connected to GND. SYNC is a negative-edge triggered input that
allows synchronization to an external frequency ranging between 270kHz and 530kHz.
When SYNC is clocked by an external signal, the converter operates in PWM mode until
the load current drops below the PWM to PFM threshold. Thereafter the converter
continues operation in PFM mode.
7.9
Connecting ENABLE to GND places the
shutdown, the reference, control circuitry, external switching MOSFET, and the oscillator
are turned off and the output falls to 0V. Connect ENABLE to voltages higher than 4.5V
for normal operation. As this input operates analog the voltage applied at this pin should
have a slope of 0.5V/3µs to avoid undefined states within the device.
7.10
A typical choice of external components for the buck converter circuit is given in figure
2 and 3. For basic operation of the buck converter the input capacitors C
driver supply capacitor C
diode D1, the inductance L1 and the output capacitor C
low electromagnetic emission a Pi-filter at the input and/or a small resistor in the path
between GDRV and the gate of the PMOS may be necessary.
7.10.1
The internal PWM/PFM control loop includes a slope compensation for stable operation
in PWM mode. This slope compensation is optimized for inductance values of 47µH and
Sense resistor values of 47m
inductance different from 47µH the Sense resistor has to be changed also:
Increasing this ratio above 1000
known for peak current mode regulators without integrated slope compensation.
SYNC Input and Frequency Control
Shutdown Mode
Buck converter circuit
Buck inductance (L1) selection in terms of ripple current:
BDS
, the sense resistor R
R
-------------------
SENSE
for the 5V output voltage versions. When choosing an
L1
/H may result in sub harmonic oscillations as well-
=
(0,5...1,0
31
TLE6389-2 GV in shutdown mode. In
SENSE
10
3
OUT
--- -
H
, the PMOS device, the catch
are necessary. In addition for
IN1
TLE 6389
2007-08-13
, C
IN2
, the