TEA1210TS/N1 查看數據表（PDF） - Philips Electronics

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TEA1210TS/N1

High efficiency, high current DC/DC converter

Philips Electronics 

Philips Semiconductors

High efficiency, high current DC/DC converter

Preliminary specification

TEA1210TS

External component selection

INDUCTOR L1

The performance of the TEA1210TS is not very sensitive

to inductance value. Best efficiency performance over a

wide load current range is achieved by using an

inductance of 6.8 µH and a saturation current level of 3.0 A

at least. In case the maximum output current is lower,

other inductors are also suitable such as the

TDK SLF7032 range.

DIODE D1

The Schottky diode is only used a short time during

takeover from N-type power MOSFET and P-type power

MOSFET and vice versa. Therefore, a medium-power

diode such as Philips PRLL5819 is sufficient in most

applications.

INPUT CAPACITOR C1

The value of capacitor C1 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 value).

OUTPUT CAPACITOR C2

The value and type of capacitor C2 depend on the

maximum output current and the ripple voltage which is

allowed in the application. Low-ESR tantalum capacitors

show best results. The most important specification of

capacitor C2 is its ESR value, which mainly determines the

output voltage ripple.

CURRENT LIMITING RESISTORS

The maximum instantaneous current in upconversion

mode is set by one of the external resistors Rlimh and Rliml.

The preferred type is SMD, 1% accurate.

The digital level on pin ILIMSEL defines which one of the

resistors is used to determine the current limiting level.

The functionality of both settings is identical.

In case one current limit is enough, the unused pin

(pin ILIML or ILIMH) must be connected either to the other

pin (pin ILIMH or ILIML), or to pin UPOUT.

The values of the current limiting resistors can be derived

from the simplified formula:

Rlimh = -I-l--i-m-----(--u--3-p--4)----6–-----0---.--0---5-- , active when ILIMSEL = HIGH

Rliml = I--l--i-m-----(--u--3-p--4)----6–-----0---.--0---5-- , active when ILIMSEL = LOW

The average inductor current during limited current

operation also depends on the inductance value and the

resistive losses in all components in the power path.

Ensure that both current limiting levels do not exceed the

saturation current of the inductor.

FEEDBACK CAPACITOR C3

Capacitor C3 prevents the feedback voltage from polluting

by switching noise. A ceramic type of capacitor having a

maximum value of 33 pF is recommended.

FEEDBACK RESISTORS R1 AND R2

The output voltage is determined by the resistors

R1 and R2. The following conditions apply:

• Use 1% accurate SMD type resistors

• Resistors R1 and R2 should 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

calculated by the formula:

VO

=

1.25

×





1

+

RR-----12-- 

1999 Mar 08

13

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