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how to make a soft-start in charge pump (Read 55 times)
hdqkwr
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how to make a soft-start in charge pump
Feb 28th, 2009, 1:17am
 
Hi,all:
In a charge pump DC-DC converter, how to make a soft-start in it?As in start up time, there is large inrush current exist in charge pump.I want to get some way to suppress it, is there any reference or any suggestion?
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NiceFeng
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Re: how to make a soft-start in charge pump
Reply #1 - Apr 12th, 2009, 5:11am
 
hdqkwr wrote on Feb 28th, 2009, 1:17am:
Hi,all:
In a charge pump DC-DC converter, how to make a soft-start in it?As in start up time, there is large inrush current exist in charge pump.I want to get some way to suppress it, is there any reference or any suggestion?


Hi,hdqkwr,

  During start-up period, you could operate some of the power switches as current source, which means connected the gate voltage to a biasing voltage instead of Vdd/GND.

Feng
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mengcy
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Re: how to make a soft-start in charge pump
Reply #2 - Mar 18th, 2010, 7:15pm
 
Hi, do you integrate a short circuit protection  or current limiting block on your chip?
If the answer is yes, you can reuse the protection circuit to control the startup current.
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RobG
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Re: how to make a soft-start in charge pump
Reply #3 - Feb 22nd, 2011, 12:00pm
 
NiceFeng wrote on Apr 12th, 2009, 5:11am:
hdqkwr wrote on Feb 28th, 2009, 1:17am:
Hi,all:
In a charge pump DC-DC converter, how to make a soft-start in it?As in start up time, there is large inrush current exist in charge pump.I want to get some way to suppress it, is there any reference or any suggestion?


Hi,hdqkwr,

  During start-up period, you could operate some of the power switches as current source, which means connected the gate voltage to a biasing voltage instead of Vdd/GND.

Feng


This is easy to do... see Fig. 12 of Gregoire, "A compact switched-capacitor regulated charge pump power supply," JSSC, Aug 2006, 1944-1953
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Kevin Aylward
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Re: how to make a soft-start in charge pump
Reply #4 - Jul 6th, 2013, 8:35am
 
Large RC time constant on the reference voltage to the converter.
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Kevin Aylward
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