TLE6389-2GV50 Infineon Technologies, TLE6389-2GV50 Datasheet - Page 33

• 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
7.10.3
The crossover thresholds PFM to PWM and vice versa strongly depend on the input
voltage V
turn on and turn off delays of the external PMOS.
For more details on the PFM to PWM and PWM to PFM thresholds please refer to the
application note “TLE6389 - Determining PFM/PWM current thresholds”.
7.10.4
The choice of the output capacitor effects straight to the minimum achievable ripple
which is seen at the output of the buck converter. In continuous conduction mode the
ripple of the output voltage can be estimated by the following equation:
From the formula it is recognized that the ESR has a big influence in the total ripple at
the output, so low ESR tantalum capacitors are recommended for the application.
One other important thing to note are the requirements for the resonant frequency of the
output LC-combination. The choice of the components L and C have to meet also the
specified range given in section 3 otherwise instabilities of the regulation loop might
occur.
7.10.5
At high load currents, where the current through the inductance flows continuously, the
input capacitor is exposed to a square wave current with its duty cycle V
prevent a high ripple to the battery line a capacitor with low ESR should be used. The
maximum RMS current which the capacitor has to withstand is calculated to:
For low ESR an e.g. Al-electrolytic capacitance in parallel to an ceramic capacitance
could be used.
IN
, the Buck converter inductance L1, the sense resistor value R
PFM and PWM thresholds
Buck output capacitor (C
Input capacitor (C
I
RMS
V
Ripple
=
I
=
LOAD
IN1
) selection:
I


R
OUT
V
--------------
ESRCOUT
V
OUT
IN
) selection:
33
1
+
+
----------------------------------- -
8 f
1
-- -
3
SW


-----------------------
2 I
1
C
LOAD
I
OUT




2
SENSE
TLE 6389
2007-08-13
OUT
and the
/V
I
. To