PTH08T231WAS datasheet(5/36 Pages) TI

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PTH08T230W, PTH08T231W

SLTS265F – NOVEMBER 2005 – REVISED MAY 2007

ELECTRICAL CHARACTERISTICS (continued)

TA =25°C, VI = 5V, VO = 3.3V, CI = 330µF, CO1 = 200µF ceramic, CO2 = 100µF, IO = IOmax (unless otherwise stated)

PARAMETER

TEST CONDITIONS

PTH08T230W

MIN

TYP

MAX

UNIT

fSYNC

Synchronization (SYNC) frequency

240

400

kHz

VSYNCH

SYNC High-Level Input Voltage

5.5

SmartSync Control

VSYNCL

SYNC Low-Level Input Voltage

0.8

tSYNC

SYNC Minimum Pulse Width

200

nSec

External input capacitance

330 (7)

µF

Nonceramic

0 (8)

100

5000 (9)

Capacitance value

µF

without

Ceramic

200 (8)

500

TurboTrans

Equivalent series resistance (non-ceramic)

Ω

External output capacitance

see table

10,000

Capacitance value

µF

with

(10)

(11)

Turbotrans

Capacitance

× ESR product (C

O × ESR)

1000

10,000

µF×mΩ

Per Telcordia SR-332, 50% stress,

MTBF

Reliability

6.7

106 Hr

TA = 40°C, ground benign

(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

I > 8V, the

minimum required CI may be reduced to a 220-µF electrolytic plus a 22-µF ceramic.

(8)

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

×100µF or 4×47µF. 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.

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