Application Note April 2005 AN161.0 becoming more common today ma
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Power Sequencing Distributed Power Applications: Sequenced Turn-on Seven DC/DC Power Supplies with Latched Shutdown
Application Note April 2005 AN161.0
becoming more common today many different power supplies system. There from more different DC/DC controllers. This typically result proliferation microprocessors, ASICs FPGAs, each with their variety power supply voltages power sequencing requirements. this application, X80140 quad sequencers (See Figure used sequence seven DC/DC converters (See Figure X80140 devices monitor output each DC/DC converter. After supply reaches minimum operating level, X80140 powers next supply after fixed delay. When supplies have reached their proper level, RESET outputs inactive (HIGH) (See Figure timing). Because voltage monitors configured, failure supply causes either reset outputs become active. This triggers latch, which pulls both devices LOW, thus turning supplies. allow
resequencing requires separate reset signal main supply cycled off, then X80140 provides selectable delay each supply. options 100ms, 500ms, Sequencing seven supplies requires minimum 700ms (plus turn time each supply.) eighth voltage monitor circuit used watchdog timer (WDT). This timer starts when master (first) voltage applied. circuit work, timer second seconds. (ViGDO) output goes active before supplies have reached their proper level, then both RESET outputs will active. this event, latch clocked pins pulled HIGH, turning supplies. With seconds there some flexibility individual turn delays. With second, delay times will likely need 100ms.
RESET Interface Reset Logic Delay Control Fault Registers
VMON Logic V1MON VREF1 V2MON VREF2 V3MON VREF3 V4MON VREF4 Divider Reset
EEPROM 2kbits
V1GDO
Select 0.1s 0.5s
V2GDO
delay1 delay2 delay3 delay4 Delay circuit repeated times
V3GDO
V4GDO
FIGURE X80140 BLOCK DIAGRAM
CAUTION: These devices sensitive electrostatic discharge; follow proper Handling Procedures. 1-888-INTERSIL 1-888-352-6832 Intersil (and design) registered trademark Intersil Americas Inc. Copyright Intersil Americas Inc. 2005. Rights Reserved other trademarks mentioned property their respective owners.
Application Note
Power Supply On/Off Power Supply On/Off Power Supply On/Off Power Supply On/Off Power Supply On/Off Power Supply On/Off Power Supply On/Off 3.3V
1.2V 1.8V 2.5V
1.2V
1.8V
2.5V Note: Power supply monitored V4MON used WDT.
X80140/41/42/43 V4GDO V4MON V3GDO V3MON V2GDO V2MON V1GDO V1MON RESET
X80140/41/42/43 V4GDO V4MON V3GDO V3MON V2GDO V2MON V1GDO V1MON RESET 74HC76
74HC4078
Reset
FIGURE EXAMPLE RELAY POWER SUPPLY SEQUENCING
AN161.0 April 2005
Application Note
V1MON tDELAY1 V1GDO Power Supply OUTPUT
V1MON threshold Programmable Delay
100ms 500ms 1sec
Timing Scale Example: Independent Power Supplies relay timing
Power Supply V2MON 100ms threshold 500ms 1sec Programmable Delay Power Supply 100ms 500ms 1sec Programmable Delay Power Supply V3MON threshold
tDELAY2 V2GDO Power Supply OUTPUT
tDELAY3
V3GDO
Vn-1GDO Power Supply OUTPUT
Power Supply #n-1 VnMON threshold tDELAYn Programmable Delay Power Supply 100ms 500ms 1sec
VnGDO
RESET1
RESET2 RESET "Wire" (J-K clock)
Assume times before supplies good (V4GDO) also FF#2 clock
FIGURE RELAY SEQUENCING DC/DC SUPPLIES. (TIMING)
Intersil Corporation reserves right make changes circuit design, software and/or specifications time without notice. Accordingly, reader cautioned verify that Application Note Technical Brief current before proceeding.
information regarding Intersil Corporation products, www.intersil.com
AN161.0 April 2005
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