TPS54611Q1,TPS54612Q1

TPS54613Q1,TPS54614Q1

TPS54615Q1,TPS54616Q1

SGLS266G − OCTOBER 2004 − REVISED JUNE 2008

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6

ELECTRICAL CHARACTERISTICS (CONTINUED)

TJ = –40°C to 125°C, VI = 3 V to 6 V (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

OSCILLATOR

Internally set—free running frequency

FSEL

≤ 0.8 V, RT open

265

350

440

kHz

Internally set—free running frequency

FSEL

≥ 2.5 V, RT open

415

550

680

kHz

Externally set—free running

RT = 180 k

Ω (1% resistor to AGND)(1)

252

280

308

Externally set—free running

frequency range

RT = 160 k

Ω (1% resistor to AGND)

290

312

350

kHz

frequency range

RT = 68 k

Ω (1% resistor to AGND)(1)

663

700

762

kHz

High level threshold, FSEL

2.5

V

Low level threshold, FSEL

0.8

V

Pulse duration, FSEL(1)

50

ns

Frequency range, FSEL(1) (4)

330

700

kHz

Ramp valley(1)

0.75

V

Ramp amplitude (peak-to-peak)(1)

1

V

Minimum controllable on time(1)

200

ns

Maximum duty cycle(1)

90%

(1) Specified by design

(2) Static resistive loads only

(3) Tested using circuit in Figure 10.

(4) To ensure proper operation when RC filter is used between external clock and FSEL pin, the recommended values are R ≤ 1kΩ and

C

≤ 68 pF.