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TLE6389 Datasheet(PDF) 28 Page - Infineon Technologies AG

Part # TLE6389
Description  Step-Down DC/DC Controller
PDF  38 Pages
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

TLE6389 Datasheet(HTML) 28 Page - Infineon Technologies AG

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TLE 6389
Datasheet Rev. 2.1
28
2007-08-13
Figure 3
Application circuit TLE6389-2 GV
7.3
Output voltage at adjustable version - feedback divider
The output voltage is sensed either by an internal voltage divider connected to the VOUT
pin (TLE6389-2 GV50 and TLE6389-3 GV50, fixed 5V versions) or an external divider
from the Buck output voltage to the FB pin (TLE6389-2 GV, adjustable version). Pin
VOUT has to be connected always to the Buck converter output regardless of the
selected output voltage for the -2GV version.
To determine the resistors of the feedback divider for the desired output voltage VOUT at
the TLE6389-2 GV select RFB2 between 5kΩ and 500kΩ and obtain RFB1 with the
following formula:
VFB is the threshold of the error amplifier with its value of typical 1.25V which shows that
the output voltage can be adjusted in a range from 1.25V to 15V. However the integrated
Reset function will only be operational if the output voltage level is adjusted to >7V.
Also the current consumption will be increased in PFM mode in the range between
1.25V and 7V.
M1
D1
COUT =
100
µF
V
OUT
C
BDS=
220 nF
V
IN
L1 =47 µH
TLE6389-2 GV
GDRV
BDS
VOUT
GND
ENABLE
CIN1=
100
µF
ON OFF
CS
R
SENSE=
47m
Ω
M1: Infineon BSO613SPV
Infineon BSP613P
D1: Motorola MBRD360
L1: EPCOS B82479-A1473-M
Coilcraft DO3340P-473
CIN1: Electrolythic
CIN2: Ceramic
COUT: Low ESRTantalum
RSI1=
400k
Ω
CIN2 =
220nF
RSI2=
100k
Ω
FB
SO
RO
SYNC
COMP
RFB2=
47k
Ω
11
13
7
SI
VS
14
12
3
9
2
8
10
4
5
1
SI_GND
6
to e.g. 5V rail
RSO=
RRO=
20k
Ω
to µC
to µC
RFB1=
330k
Ω
680
Ω
2.2nF
RFB1
RFB2
VOUT
VFB th
,
---------------- 1
–


⋅
=



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