TEA1202TS_02 データシートの表示（PDF） - Philips Electronics

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TEA1202TS_02

0.95 V starting power unit

Philips Electronics 

Philips Semiconductors

0.95 V starting power unit

Preliminary specification

TEA1202TS

handbook, full pagewidth

USB supply

5V

0.95 to 1.5 V 1

DC/DC CONVERTER 4

BAW62

Vbat

20

120

µF

130

kΩ

16

120

µF

68

kΩ

TEA1202TS

MGU589

LDO1

6

120

kΩ

7

68

kΩ

3.3 V

load

2.2

µF

Fig.9 Application with USB and single-cell NiCd or NiMH battery supply.

13.1 External component selection

Component references apply to the circuits shown in

Figs 5 to 8.

13.1.1 INDUCTOR L1

The performance of the TEA1202TS is not very sensitive

to inductance value. The best efficiency performance over

a wide load current range is achieved by using an

inductance of 6.8 µH, for example TDK SLF7032 or

Coilcraft DO1608 range.

13.1.2 DC-TO-DC INPUT CAPACITOR C1

The value of C1 depends strongly on the type of input

source. In general, a 100 µF tantalum capacitor is

sufficient.

13.1.3 DC-TO-DC OUTPUT CAPACITOR C2

The value and type of C2 depends on the maximum output

current and the ripple voltage which is allowed in the

application. Low-ESR tantalum capacitors show good

results. The most important specification of C2 is its ESR,

which mainly determines output voltage ripple.

13.1.4 DIODE D1

The Schottky diode is only used for a short time during

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

MOSFET and vice versa. Therefore, a medium-power

diode is sufficient in most applications, for example

Philips PRLL5819.

13.1.5 FEEDBACK RESISTORS R1 AND R2

The output voltage of the DC-to-DC converter is

determined by the resistors R1 and R2. The following

conditions apply:

• Only use 1% tolerance SMD-type resistors. If larger

body-size resistors are used, the capacitance on

pin FB0 will be too large and could cause inaccurate

operation

• 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

=

Vr

ef

×





1

+

RR-----12--





2002 Mar 14

19

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