www.ti.com

PTH08T260W, PTH08T261W

SLTS272A – DECEMBER 2006 – REVISED MAY 2007

ELECTRICAL CHARACTERISTICS (continued)

T

PARAMETER

TEST CONDITIONS

PTH08T260W

MIN

TYP

MAX

UNIT

Synchronization (SYNC) frequency

240

400

kHz

SYNC High-Level Input Voltage

2

5.5

V

SmartSync Control

SYNC Low-Level Input Voltage

0.8

V

SYNC Minimum Pulse Width

200

nSec

External input capacitance

µF

Nonceramic

Capacitance value

µF

without

Ceramic

500

TurboTrans

Equivalent series resistance (non-ceramic)

7

m

Ω

External output capacitance

see table

10,000

Capacitance value

µF

with

(10)

(11)

Turbotrans

Capacitance

× ESR product (C

1000

10,000

µF×mΩ

Per Telcordia SR-332, 50% stress,

MTBF

Reliability

6.7

(7)

A 330 µF electrolytic input capacitor is required for proper operation. The capacitor must be rated for a minimum of 450 mA rms of ripple

current. An additional 22-

µF ceramic input capacitor is recommended to reduce rms ripple current. When operating at V

(8)

100 µF ceramic & 100

µF non-ceramic external output capacitance is required for basic operation. The 100 µF required ceramic output

capacitance can be made up of 2

× 47 µF. The minimum output capacitance requirement increases when TurboTrans™ (TT) technology

is used. See the Application Information for more guidance.

(9)

This is the calculated maximum disregarding TurboTrans™ technology. When the TurboTrans feature is used, the minimum output

capacitance must be increased. See the TurboTrans application notes for further guidance.

(10) When using TurboTrans™ technology, a minimum value of output capacitance is required for proper operation. Additionally, low ESR

capacitors are required for proper operation. See the TurboTrans application notes for further guidance.

(11) This is the calaculated maximum when using the TurboTrans feature. Additionally, low ESR capacitors are required for proper operation.

See the TurboTrans application notes for further guidance.

5

Submit Documentation Feedback