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PTH08T260W, PTH08T261W

SLTS272A – DECEMBER 2006 – REVISED MAY 2007

ELECTRICAL CHARACTERISTICS (continued)

T

PARAMETER

TEST CONDITIONS

PTH08T261W

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

without

Capacitance value

Ceramic

5000

µF

TurboTrans

External output capacitance

see table

Capacitance value

Ceramic

µF

with

(9)

Turbotrans

Capacitance

× ESR product (C

100

1000

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)

200 µF ceramic external output capacitance is required for basic operation. The required ceramic output capacitance can be made up of

2

× 100 µF or 4 × 47 µF. The minimum output capacitance requirement increases when TurboTrans™ (TT) technology is used. See the

Application Information for more guidance.

(9)

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.

(10) 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.

7

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