TEA1206 データシートの表示（PDF） - Philips Electronics

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TEA1206

High efficiency DC/DC converter

Philips Electronics 

Philips Semiconductors

High efficiency DC/DC converter

Preliminary specification

TEA1206T

External component selection

INDUCTOR

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 µH 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.

INPUT CAPACITANCE

The value of Cin strongly depends on the type of input

source. In general, a 100 µF tantalum capacitor will do, or

a 10 µF ceramic capacitor featuring very low series

resistance (ESR).

OUTPUT CAPACITOR

The value and type of Cout depends on the maximum

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 Cout is its ESR, which mainly determines output voltage

ripple.

DIODE

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.

OUTPUT VOLTAGE SETTING

The output voltage level is determined by the resistors R1

and R2. The following conditions apply:

• 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 kΩ when connected in parallel. A higher value will

result in inaccurate operation.

Under these conditions, the output voltage can be set by

the formula: Vout = 1.24 × (1 + R1/R2).

CURRENT LIMIT SETTING

The maximum instantaneous current is set by the external

resistor Rlim. Preferred type is SMD, 1% accurate.

The connection of Rlim differs per mode:

• In UP conversion mode, Rlim must be connected

between pin 2 (ILIM) and pin 3 (UPOUT/DNIN).

The current limit level is defined by: IlimN = 440/ Rlim.

• In DOWN conversion mode, Rlim must be connected

between pin 2 (ILIM) and pin 6 (GND).

The current limit level is defined by: IlimP = 650/ Rlim.

The average inductor current during current limit also

depends on inductance value and resistive losses in all

components in the power path. Ensure that Ilim < Isat of the

inductor.

1999 Sep 16

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