PS10 Datasheet, PDF (1/13 Pages) Supertex, Inc – Quad Power Sequencing Controller

PS10 - Active H^Pig^S1h^0/PS11
PS11 - Active Low
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
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.
Typical Application Circuit
GND or +48V
-48V or GND
487K
6.81K
9.76K
6
UV
5
OV
14
VIN
1
PWRGD-D / PWRGD-D
2
PWRGD-C / PWRGD-C
3
PWRGD-B / PWRGD-B
4
PS10/PS11 ^{PWRGD-A / PWRGD-A}
7
VEE
TB
11
TC
12
TD
13
Ramp
10
RTB RTC RTD
10nF
Notes:
1. Under Voltage Shutdown (UV) set to 37V.
2. Over Voltage Shutdown (OV) to 57.8V.
/EN
DC/DC
CONVERTER
+12V
COM
/EN
DC/DC
CONVERTER
+5V
COM
/EN
DC/DC
CONVERTER
+3.3V
COM
/EN
DC/DC
CONVERTER
+2.5V
COM
Waveform
(49.9k pull-up on PS11 PWRGD pins)
Relative to Negative Rail
A051204
Supertex, Inc.
•
1235
Bordeaux
Drive,
Sunnyvale,
CA
94089
1
•
Tel:
(408)
222-8888
•
FAX:
(408)
222-4895
•
www.supertex.com