PS10 - Active High
PS11 - Active Low
PS10/PS11
Initial Release
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
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.
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
Typical Application Circuit
GND or +48V
487K
6
UV
14
V
IN
PWRGD-D / PWRGD-D
PWRGD-C / PWRGD-C
6.81K
5
7
OV
V
EE
PWRGD-B / PWRGD-B
1
2
3
4
/EN
DC/DC
CONVERTER
Waveform
(49.9k pull-up on PS11 PWRGD pins)
/EN
DC/DC
CONVERTER
+12V
COM
+5V
COM
PS10/PS11
TB
11
TC
12
TD
13
PWRGD-A / PWRGD-A
9.76K
Ramp
10
/EN
DC/DC
CONVERTER
+3.3V
COM
RTB
RTC
RTD
10nF
/EN
+2.5V
COM
-48V or GND
DC/DC
CONVERTER
Notes:
1. Under Voltage Shutdown (UV) set to 37V.
2. Over Voltage Shutdown (OV) to 57.8V.
Relative to Negative Rail
A051204
Supertex, Inc.
•
1235 Bordeaux Drive, Sunnyvale, CA 94089
•
Tel: (408) 222-8888
•
FAX: (408) 222-4895
•
www.supertex.com
1
SUPERTEX [ Supertex, Inc ]
