Rainbow-electronics DS2710 Manual do Utilizador descarregar pdf (Página 11)

DS2710

Single-Cell NiMH Charger

______________________________________________________________________________________ 11

DS2710

THM

STATUS

VP1

VN1

VN0

TMR CTEST V

1kΩ

270kΩ

1kΩ

150Ω

10kΩ

100kΩ

47kΩ

0.1Ω

NiMH

CELL

1μF

10μF

CERAMIC

ZXM62P02E6

+5V

(USB+)

GROUND

(USB-)

15μH

SISCDRH74M-150R

1W B340A-13

SCHOTTKY

10μF

CERAMIC

GREEN

SMA

RT1

103AT-2

Figure 5. Typical Application Circuit for USB Port Charging

Referring to the example circuit and layout of Figure 6,

the loop labeled as Loop1 encompassing C

SWITCH

, and D

SWITCH

should be kept as small as

possible to minimize the change in loop area that

occurs when switching from the OFF to the ON state

and vice versa. Loop2 should also be minimized as

much as practical, although it contains DC current

components for the most part. The returning ground

currents should be allowed to follow a path on a layer

directly under the outgoing path since the high-fre-

quency components try to follow the path of least

impedance. Low ESR and ESL capacitors should be

used when possible and for all capacitors 10µF and

smaller. Typical surface-mount ceramic types with an

X5R or better dielectric are recommended.

Another important layout detail is the connection of the

sense resistor. Proper Kelvin connection layout should

be used to ensure the signal quality viewed by the

sensing circuit inside the DS2710 is adequate. Figure 7

shows a recommended connection of the sense lines to

the resistor footprint.

PACKAGE TYPE PACKAGE CODE DOCUMENT NO.

10 TDFN-EP —

56-G0012-001

Package Information

For the latest package outline information and land patterns, go

to www.maxim-ic.com/packages

1 2 ... 6 7 8 9 10 11 12

Single-Cell NiMH Charger 1

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