TEA1206 Philips Semiconductors, TEA1206 Datasheet - Page 12

• Manufacturer Part Number: TEA1206
• Description: High efficiency DC/DC converter
• Manufacturer: Philips Semiconductors

Philips Semiconductors
External component selection
I
The performance of the TEA1206 is not very sensitive to
inductance value. Best efficiency performance over a wide
load current range is achieved by using e.g. TDK
SLF7032-6R8M1R6, having an inductance of 6.8 H and
a saturation current level of 1.6 A. In case the maximum
output current is lower, other inductors are also suitable
like the small sized Coilcraft DT1608 range.
I
The value of C
source. In general, a 100 F tantalum capacitor will do, or
a 10 F ceramic capacitor featuring very low series
resistance (ESR).
O
The value and type of C
output current and the ripple voltage which is allowed in
the application. Low-ESR tantalum as well as ceramic
capacitors show good results. Most important specification
of C
ripple.
D
The schottky diode is only used during a small time during
takeover from N-type powerfet and P-type powerfet and
vice versa. Therefore, a medium-power diode like Philips
PRLL5819 is sufficient.
1999 Sep 16
NDUCTOR
NPUT CAPACITANCE
IODE
UTPUT CAPACITOR
High efficiency DC/DC converter
out
is its ESR, which mainly determines output voltage
in
strongly depends on the type of input
out
depends on the maximum
12
O
The output voltage level is determined by the resistors R1
and R2. The following conditions apply:
Under these conditions, the output voltage can be set by
the formula: V
C
The maximum instantaneous current is set by the external
resistor R
The connection of R
The average inductor current during current limit also
depends on inductance value and resistive losses in all
components in the power path. Ensure that I
inductor.
URRENT LIMIT SETTING
UTPUT VOLTAGE SETTING
Use 1% accurate SMD type resistors only. In case larger
body resistors are used, the capacitance on pin 7 (FB)
will be too large, causing inaccurate operation.
Resistors R1 and R2 shall have a maximum value of
50 k when connected in parallel. A higher value will
result in inaccurate operation.
In UP conversion mode, R
between pin 2 (ILIM) and pin 3 (UPOUT/DNIN).
The current limit level is defined by: I
In DOWN conversion mode, R
between pin 2 (ILIM) and pin 6 (GND).
The current limit level is defined by: I
lim
. Preferred type is SMD, 1% accurate.
out
= 1.24
lim
differs per mode:
(1 + R1/R2).
lim
must be connected
lim
Preliminary specification
must be connected
TEA1206T
limN
limP
= 650/ R
= 440/ R
lim
< I
sat
lim
lim
of the
.
.