PS10 datasheet(12/13 Pages) SUTEX

12 / 13 page

PS10/PS11

A051204

PS10 Power Good Clamp

If the active high enabled dc/dc converter used does not have an internal clamp, an external zener diode may be used to pro-

tect the module.

RTB

9.76K

6.81K

487K

RTD

RTC

PWRGD-C

PWRGD-D

PWRGD-A

PWRGD-B

PS10

-48V

GND

Notes:

1. Under Voltage Shutdown (UV) set to 37V.

2. Over Voltage Shutdown (OV) to 57.8V.

3. Other power good outputs will have the same

configuration as PWGRGD-A for Active High Enabled

Converters.

10nF

Ramp

COM

+3.3V

49.9k

V-

V+

DC/DC

Converter

Typical Application Circuit for a 12V Non-Isolated System

Most FPGAs, Processors, ASICs, and DSPs require sequencing and rail voltage limitation during start-up and power down

sequence of its rails. A typical requirement is: VDD_CORE must not exceed VDD_IO more than 0.6V and VDD_IO must not ex-

ceed VIN at any time. This can be accomplished by sequencing the dc/dc converters by the following manner:

Turn On: VDD_CORE first, VDD_IO second, and VIN last.

Tun-Off: VIN first, VDD_IO second, and VDD_CORE last.

The Schottky diodes will limit the voltage between the rails to around 0.3V @ 3A during the power-up and power-down

sequence.

Assuming that the /EN pins of the dc/dc converters have no pull-up and have a 1.0V turn-off threshold, the power-down

sequence time delays can be approximated by:

TPWRGD-C to TPWRGD-B = 1

µF x 1V / 1mA = 1ms

TPWRGD-B to TPWRGD-A = (2

µF-1µF) x 1V / 1mA = 1ms

RTB

RTD

RTC

Buck

Converter

Buck

Converter

/EN

Buck

Converter

/EN

PWRGD-C

PWRGD-D

PWRGD-A

PWRGD-B

+2.5V

+5V

PS11

GND

+12V

10nF

Ramp

+3.3V

GND

VDD_CORE

LOAD

VIN

VDD_IO

30BQ015

12k

1uF

2uF

Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an

adequate "products liability indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of

devices determined to be defective due to workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change

without notice. For the latest product specifications, refer to the Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the

most current databook or to the Legal/Disclaimer page on the Supertex website.

1235 Bordeaux Drive, Sunnyvale, CA 94089

TEL: (408) 222-8888 / FAX: (408) 222-4895

www.supertex.com

A051204

Doc. #: DSFP-PS10PS11

PS10 Datasheet(PDF) 12 Page - Supertex, Inc

PS10 Datasheet(HTML) 12 Page - Supertex, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13

Datasheet Download

Link URL