PS10/PS11

1

Quad Power Sequencing Controller

Features

Sequencing of Four or More* Supplies, ICs, or Sub-

systems

Independently Programmable Delays Between Open

Drain PWRGD Flags (5ms to 200ms)

±10V to ±90V Operation

Tracking in Combination with Schottky Diodes

Input Supervisors Including:

o

UV/OV Lock Out/Enable

o

Power-On-Reset (POR)

Low Power Consumption, 0.4mA Supply Current

Small SO-14 Package

*By Daisy-Chaining PS10/11’s

Applications

Power Supply Sequencing

-48V Telecom and Networking Distributed Systems

-24V Cellular and Fixed Wireless Systems

-24V PBX Systems

+48V Storage Systems

FPGA, Microprocessor Tracking

Industrial/Embedded System Timing/Sequencing

High Voltage MEMs Driver’s Supply Sequencing

High Voltage Display Driver’s Supply Sequencing

Description

Many of today’s high performance FPGA’s, Microproces-

sors, DSP and industrial/embedded subsystems require

sequencing of the input power. Historically this has been

accomplished: i) discretely using comparators, references

& RC circuits; ii) using expensive programmable control-

lers; or iii) with low voltage sequencers requiring resistor

drop downs and several high voltage optocoupler or level

shift components.

The PS10/11 saves board space, improves accuracy,

eliminates optocouplers or level shifts and reduces overall

component count by combining four timers, programmable

input UV/OV supervisors, a programmable POR and four

90V open drain outputs. A high reliability, high voltage,

junction isolated process allows the PS10/11 to be con-

nected directly across the high voltage input rails.

The power-on-reset interval (POR) may be programmed

by a capacitor on Cramp. To sequence additional sys-

tems, PS10/11 may be daisy chained together. If at any

time the input supply falls outside the UV/OV detector

range the PWRGD outputs will immediately become IN-

ACTIVE. Down sequencing may be accomplished with

additional components (see page 11).

The PS10/PS11 is available in a space saving SO-14

package.

PS10 - Active High

PS11 - Active Low

A051204

Relative to Negative Rail

Typical Application Circuit

Waveform

(49.9k pull-up on PS11 PWRGD pins)

Initial Release

RTB

9.76K

6.81K

487K

RTD

RTC

/EN

DC/DC

CONVERTER

DC/DC

CONVERTER

DC/DC

CONVERTER

/EN

/EN

DC/DC

CONVERTER

TB

OV

UV

V

/EN

TC

PWRGD-C / PWRGD-C

PWRGD-D / PWRGD-D

TD

PWRGD-A / PWRGD-A

PWRGD-B / PWRGD-B

COM

COM

COM

+2.5V

+3.3V

+5V

+12V

PS10/PS11

COM

-48V or GND

GND or +48V

Notes:

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

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

10nF

Ramp

V

13

10

4

3

2

1

14

6

5

7

11

12

EE

IN

Supertex, Inc.

• 1235 Bordeaux Drive, Sunnyvale, CA 94089 • Tel: (408) 222-8888 • FAX: (408) 222-4895 • www.supertex.com