TPS23785B

SLUSB90A – DECEMBER 2012 – REVISED DECEMBER 2012

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DESCRIPTION (CONT.)

The DC-to-DC controller features two complementary gate drivers with programmable dead time. This simplifies

design for highly-efficient flyback topologies utilizing secondary synchronous rectification. The second gate driver

may be disabled if desired for single MOSFET topologies. The controller also features internal softstart, bootstrap

startup source, current-mode compensation, and a 78% maximum duty cycle. A programmable and

synchronizable oscillator allows design optimization for efficiency and eases use of the controller to upgrade

existing power supply designs. Accurate programmable blanking, with a default period, simplifies the usual

current-sense filter design trade-offs.

This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with

appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.

ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more

susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.

POE UVLO

CONVERTER UVLO

DUTY CYCLE

ON / HYST.

ON / HYST.

PACKAGE

MARKING

(V)

(V)

TPS23785BPWP

0–78%

35 / 4.5

15 / 6.5

TSSOP-24 PowerPAD™

TPS23785B

(1)

For the most current package and ordering information, see the Package Option Addendum at the end of this document, or consult your

TI salesperson.

ABSOLUTE MAXIMUM RATINGS

(1) (2)

VALUE

UNIT

–0.3 to 100

-0.3 to 6.5

–0.3 to 6.5

COM]

Input voltage range

–0.3 to 6.5

V

CS to [ARTN,COM]

[ARTN, COM] to RTN

–2 to 2

–0.3 to 19

Voltage range

RTN

Internally limited

Sinking current

T2P

20

mA

Sourcing current

Internally limited

Average Sourcing or

GATE, GAT2

25

sinking current

Human body model (HBM)

2

kV

ESD rating

Charged device model (CDM)

500

V

Machine model (MM)

50

8 / 15

kV

–40 to Internally limited

°C

(1)

Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings

only and functional operation of the device at these or any other conditions beyond those indicated under recommended operating

conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2)

ARTN and COM tied to RTN.

(3)

(4)

Do not apply voltage to these pins

(5)

ESD per EN61000-4-2. A power supply containing the TPS23785B was subjected to the highest test levels in the standard.

2

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