PS10NG Datasheet, PDF (1/9 Pages) Supertex, Inc – Quad Power Sequencing Controller

PS10
Quad
Power Sequencing Controller
Features
► Sequencing of four supplies, ICs, or subsystems
► Independently programmable delays between open
drain PWRGD flags (5.0 to 200ms)
► ±10 to ±90V operation
► Tracking in combination with Schottky diodes
► Input supervisors including:
• UV/OV lock out/enable
• Power-on-Reset (POR)
► Low power consumption, 0.4mA supply current
► Available in a space saving 14-Lead SOIC 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
General Description
Many of today’s high performance FPGA’s, microprocessors,
DSP and industrial/embedded subsystems require sequencing
of the input power. Historically this has been accomplished
by: i) discretely using comparators, references & RC circuits;
ii) using expensive programmable controllers; or iii) with low
voltage sequencers requiring resistor drop downs and several
high voltage optocoupler or level shift components.
The PS10 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 to be connected directly across the
high voltage input rails.
The power-on-reset interval (POR) may be programmed by a
capacitor on C_RAMP. To sequence additional systems, multiple
PS10s 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.
The PS10 is available in a space saving 14-Lead SOIC
package.
Typical Application Circuit
GND or +48V
487KΩ
6
UV
14
VIN
6.81KΩ
9.76KΩ
5
OV
7
VEE
TB
11
PS10
TC
TD
12
13
RAMP
10
PWRGD-D ¹
PWRGD-C ²
PWRGD-B ³
PWRGD-A ⁴
RTB RTC RTD
10nF
-48V or GND
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
● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com