TLE 6389-3G V50 Infineon Technologies, TLE 6389-3G V50 Datasheet - Page 32

• Manufacturer Part Number: TLE 6389-3G V50
• Manufacturer: Infineon Technologies

Specifications of TLE 6389-3G V50

• Packages: PG-DSO-14
• Comment: Vin up to 60V; external MOS
• Vq (max): 5.0V
• Iq (max): 2,300.0 mA
• Iq (typ): 130.0 µA
• Output: Buck Converter

Datasheet Rev. 2.1
To achieve the same effect of slope compensation in the adjustable voltage version also
the inductance in µH is given by
The inductance value determines together with the input voltage, the output voltage and
the switching frequency the current ripple which occurs during normal operation of the
step down converter. This current ripple is important for the all over ripple at the output
of the switching converter.
In this equation f
internal oscillator or by an external source connected to the SYNC pin. When picking
finally the inductance of a certain supplier (Epcos, Coilcraft etc.) the saturation current
has to be considered. The saturation current value of the desired inductance has to be
higher than the maximum peak current which can appear in the actual application.
7.10.2
The peak current which the buck converter is able to provide is determined by the peak
current limit threshold voltage V
current given by the application (I
to
The equation above takes account for the foldback characteristic of the current limit as
shown in the Fig. ’Output Voltage vs. Load Current’ on page 24/25 by introducing a factor
of 2. It must be assured by correct dimensioning of R
reach the foldback part of the characteristic curve.
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2,0 10
Determining the current limit
4 –
sw
-------- - V
V
H
is the actual switching frequency of the device, given either by the
OUT
R
R
LIM
I
SENSE
SENSE
PEAK, PWM
=
and the sense resistor R
------------------------------------------------------
V


IN
=
f
SW
–
------------------------------------ -
2 I
L1
=I
32
V
LOAD
OUT
V
PEAK PWM
V
IN


LIM
4,0 10
+0.5 I) the sense resistor is calculated
L1
V
OUT
SENSE
4 –
SENSE
that the load current doesn’t
-------- - V
V
H
. With a maximum peak
OUT
R
SENSE
TLE 6389
2007-08-13
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