TPS61007 datasheet(18/22 Pages) TI

18 / 22 page

TPS61000, TPS61001, TPS61002, TPS61003, TPS61004, TPS61005, TPS61006, TPS61007

SINGLE- AND DUAL-CELL BOOST CONVERTER WITH START-UP INTO FULL LOAD

SLVS279C – MARCH 2000 – REVISED APRIL 2003

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

Resistor RC and capacitor CC2 depend on the chosen inductance. For a 33-µH inductor, the capacitance of CC2

should be chosen to 33 nF, or in other words, if the inductor is xx

µH, the chosen compensation capacitor should

be xx nF, the same number value. The value of the compensation resistor is then chosen based on the require-

ment to have a time constant of 0.3 ms for the R/C network of RC and CC2; hence for a 33-nF capacitor, a 10-kΩ

resistor should be chosen for RC.

Capacitor CC1 is depending on the ESR and capacitance value of the output capacitor, and on the value chosen

for RC. Its value is calculated using following equation:

C1 +

x ESR

COUT

(7)

For a selected output capacitor of 22

µF with an ESR of 0.2 Ω, and RC of 33 kΩ, the value of CC1 is in the range of

100 pF.

Table 3. Recommended Compensation Components

INDUCTOR

OUTPUT CAPACITOR

INDUCTOR

[µH]

CAPACITANCE

[µF]

ESR

[

Ω]

CC1

[pF]

CC2

[nF]

0.2

100

0.3

100

0.4

100

0.1

100

schematic of TPS6100x evaluation modules (TPS6100xEVM–156)

LBO

LBI

NC/FBGND

VBAT

COMP

GND

VOUT

LP1

OUT

TPS6100x

Evaluation modules are available for device types TPS61000, TPS61002, TPS61003, and TPS61006.

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