MC34063 with small inductors
in [Design]
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From: dagmargoodboat on 8 Apr 2010 00:27 On Apr 7, 9:48 pm, Joerg <inva...(a)invalid.invalid> wrote: > dagmargoodb...(a)yahoo.com wrote: > > On Apr 7, 7:06 pm, Joerg <inva...(a)invalid.invalid> wrote: > >> There's actually three more models around but they essentially behave > >> similar. Thing is, the chip is not supposed to turn off the switch > >> during the positive ramp because the comparator does not tie into the > >> reset input of the register, only the set input. > > >> <scratching_ head> > > > Yeah. I read TI's app note. So it can start an ON cycle any time > > during ramp up, but can't ever stop until ramp-down. Crude. Burp, > > sputter, and cough, in this application. > > Well, if it did that I'd be happy. But it does cut during ramp-down and > according to the internal wire-up it's not supposed to. Helmut > Sennewald, one of the LTSpice gurus, could not reproduce the error I > saw. Sent him my file, so we'll see. It's s'posed to cut off during ramp-down--that's when the flop gets reset, unconditionally. So says TI, anyhow. http://focus.ti.com/lit/an/slva252b/slva252b.pdf the operative paragraph being the last one pg. 5. And, the last comment in Table 1 confirms: "Output switch conduction is always terminated when Ct is ramping down." -- Cheers, James Arthur
From: RST Engineering on 8 Apr 2010 04:14 Will you PLEASE learn how to FRIKKIN learn how to snip? PLEASE I really appeciate your responses, but I'll be damned if 'll scan down three or four pages to find your answ3r Thanks Jim On Wed, 07 Apr 2010 17:03:27 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote: >On 7 Apr 2010 16:56:30 -0700, Winfield Hill ><Winfield_member(a)newsguy.com> wrote: > >>Jim Thompson wrote... >>> >>> Is the model in text format or is it encrypted? >> >> The Intusoft version is in plain text. I think this >> is it, along with an X1 call. It's not exactly what >> I expected to see. E.g., who's Kehinde Omolayo? Hmm, >> Magnetico, Inc. Hmm, 2003, "Standex International Corp. >> has purchased substantially all of the assets..."; the >> trail grows cold. >> >>X1 7 4 5 0 8 6 7 7 MC34063AX2 { } >>.SUBCKT MC34063AX2 1 2 3 4 5 6 7 8 >>*exempt 20030227 20395 -30736294 >>*BY KEHINDE OMOLAYO 2-20-03 >>*TERMINAL ID >>*SWITCH COLLECTOR=1 SWITCH EMITTER=2 TIMING CAPACITOR=3 GND=4 >>*COMPARATOR INVERTING INPUT=5 VCC=6 IPK SENSE=7 DRIVER COLLECTOR=8 >>.MODEL DMC34063 D (CJO=2P N=0.05) >>.MODEL QSWITCH NPN BF=75 CJC=2P IS=3E-9 RB=1 RC=0.45 RE=0 >>+ VJC=.75 VJE=.75 VJS=.75 >>E1 10 0 5 4 1 >>R1 4 5 10MEG >>V1 20 0 PULSE 0 2 >>E2 11 0 3 4 1 >>B1 13 0 V=1M/(ABS((27.475-195M*V(12))+(36.002+244M*V(12))*V(9)- >>+(302.302+651M*V(12))*V(9)^2)+1F) >>E3 12 0 6 4 1 >>E4 9 0 6 7 1 >>R2 6 7 10MEG >>B2 14 0 V=1M*((-10.765-151M*V(12))+(45.344+864M*V(12))*V(9)- >>+(35.99+1.378*V(12))*V(9)^2+(8.341+839M*V(12))*V(9)^3) >>B4 15 0 V=V(9)>0.32 ? V(14) : V(13) >>C1 19 0 10P >>B5 16 0 V= V(20)<1 ? 2 : V(24)>1 ? 2 : V(19)>1 ? 0 : 2 >>R3 16 17 150 >>C2 17 0 10P >>B6 18 0 V=V(20)<1 ? 0 : V(24)>1 ? 0 : V(11)<(1.083-1.239*V(29)) ? 2 : >>+ V(17)>1 ? 0 : 2 >>R4 18 19 150 >>D1 4 3 DMC34063 >>D2 3 6 DMC34063 >>C3 11 31 1N >>B7 4 36 I=V(17)>1 ? -(224.4U+2.359U*V(12))*0.77 : V(15)*0.77 >>C5 23 0 10P >>B9 21 0 V= V(20)<1 ? 2 : V(17)>1 ? 2 : V(26)>1 ? 0 : 2 >>R5 27 26 150 >>C6 26 0 10P >>B10 27 0 V=V(20)<1 ? 0 : V(17)>1 ? 0 : V(10)<1.25 ? 2 : V(23)>1 ? 0 : 2 >>R6 21 23 150 >>B12 33 0 V=V(11)>(1.148+184.6M*V(29)) ? 2 : 0 >>R13 33 24 10K >>C8 24 0 10P >>Q1 8 30 25 QSWITCH >>Q2 1 25 2 QSWITCH >>R15 25 2 100 >>D5 2 30 DMC34063 >>G1 2 30 26 23 5M >>R16 2 4 10MEG >>R23 31 28 1M >>V6 28 0 >>V7 36 3 >>B13 29 0 V=I(V6)/(I(V7)+866.8M*I(V6)) >>.ENDS > >Thanks, Win! I'll try to pick it apart when I have a free moment. >Most of those behavioral games are less than adequate... particularly >those IF..THEN..ELSE statements :-( > > ...Jim Thompson
From: John Larkin on 8 Apr 2010 11:20 On Thu, 08 Apr 2010 01:14:29 -0700, RST Engineering <jweir43(a)gmail.com> wrote: >Will you PLEASE learn how to FRIKKIN learn how to snip? > >PLEASE I really appeciate your responses, but I'll be damned if 'll >scan down three or four pages to find your answ3r > >Thanks > >Jim > > >On Wed, 07 Apr 2010 17:03:27 -0700, Jim Thompson ><To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote: > >>On 7 Apr 2010 16:56:30 -0700, Winfield Hill >><Winfield_member(a)newsguy.com> wrote: >> >>>Jim Thompson wrote... >>>> >>>> Is the model in text format or is it encrypted? >>> >>> The Intusoft version is in plain text. I think this >>> is it, along with an X1 call. It's not exactly what >>> I expected to see. E.g., who's Kehinde Omolayo? Hmm, >>> Magnetico, Inc. Hmm, 2003, "Standex International Corp. >>> has purchased substantially all of the assets..."; the >>> trail grows cold. >>> >>>X1 7 4 5 0 8 6 7 7 MC34063AX2 { } >>>.SUBCKT MC34063AX2 1 2 3 4 5 6 7 8 >>>*exempt 20030227 20395 -30736294 >>>*BY KEHINDE OMOLAYO 2-20-03 >>>*TERMINAL ID >>>*SWITCH COLLECTOR=1 SWITCH EMITTER=2 TIMING CAPACITOR=3 GND=4 >>>*COMPARATOR INVERTING INPUT=5 VCC=6 IPK SENSE=7 DRIVER COLLECTOR=8 >>>.MODEL DMC34063 D (CJO=2P N=0.05) >>>.MODEL QSWITCH NPN BF=75 CJC=2P IS=3E-9 RB=1 RC=0.45 RE=0 >>>+ VJC=.75 VJE=.75 VJS=.75 >>>E1 10 0 5 4 1 >>>R1 4 5 10MEG >>>V1 20 0 PULSE 0 2 >>>E2 11 0 3 4 1 >>>B1 13 0 V=1M/(ABS((27.475-195M*V(12))+(36.002+244M*V(12))*V(9)- >>>+(302.302+651M*V(12))*V(9)^2)+1F) >>>E3 12 0 6 4 1 >>>E4 9 0 6 7 1 >>>R2 6 7 10MEG >>>B2 14 0 V=1M*((-10.765-151M*V(12))+(45.344+864M*V(12))*V(9)- >>>+(35.99+1.378*V(12))*V(9)^2+(8.341+839M*V(12))*V(9)^3) >>>B4 15 0 V=V(9)>0.32 ? V(14) : V(13) >>>C1 19 0 10P >>>B5 16 0 V= V(20)<1 ? 2 : V(24)>1 ? 2 : V(19)>1 ? 0 : 2 >>>R3 16 17 150 >>>C2 17 0 10P >>>B6 18 0 V=V(20)<1 ? 0 : V(24)>1 ? 0 : V(11)<(1.083-1.239*V(29)) ? 2 : >>>+ V(17)>1 ? 0 : 2 >>>R4 18 19 150 >>>D1 4 3 DMC34063 >>>D2 3 6 DMC34063 >>>C3 11 31 1N >>>B7 4 36 I=V(17)>1 ? -(224.4U+2.359U*V(12))*0.77 : V(15)*0.77 >>>C5 23 0 10P >>>B9 21 0 V= V(20)<1 ? 2 : V(17)>1 ? 2 : V(26)>1 ? 0 : 2 >>>R5 27 26 150 >>>C6 26 0 10P >>>B10 27 0 V=V(20)<1 ? 0 : V(17)>1 ? 0 : V(10)<1.25 ? 2 : V(23)>1 ? 0 : 2 >>>R6 21 23 150 >>>B12 33 0 V=V(11)>(1.148+184.6M*V(29)) ? 2 : 0 >>>R13 33 24 10K >>>C8 24 0 10P >>>Q1 8 30 25 QSWITCH >>>Q2 1 25 2 QSWITCH >>>R15 25 2 100 >>>D5 2 30 DMC34063 >>>G1 2 30 26 23 5M >>>R16 2 4 10MEG >>>R23 31 28 1M >>>V6 28 0 >>>V7 36 3 >>>B13 29 0 V=I(V6)/(I(V7)+866.8M*I(V6)) >>>.ENDS >> >>Thanks, Win! I'll try to pick it apart when I have a free moment. >>Most of those behavioral games are less than adequate... particularly >>those IF..THEN..ELSE statements :-( >> >> ...Jim Thompson Funny that RST can't learn how to FRIKKIN learn how to bottom-post. John
From: Jim Thompson on 8 Apr 2010 12:06 On Thu, 08 Apr 2010 08:20:39 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Thu, 08 Apr 2010 01:14:29 -0700, RST Engineering ><jweir43(a)gmail.com> wrote: > >>Will you PLEASE learn how to FRIKKIN learn how to snip? >> >>PLEASE I really appeciate your responses, but I'll be damned if 'll >>scan down three or four pages to find your answ3r >> >>Thanks >> >>Jim >> >> [snip] >>>>B13 29 0 V=I(V6)/(I(V7)+866.8M*I(V6)) >>>>.ENDS >>> >>>Thanks, Win! I'll try to pick it apart when I have a free moment. >>>Most of those behavioral games are less than adequate... particularly >>>those IF..THEN..ELSE statements :-( >>> >>> ...Jim Thompson > > >Funny that RST can't learn how to FRIKKIN learn how to bottom-post. > >John RST? I block RST :-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | The only thing bipartisan in this country is hypocrisy
From: Joerg on 8 Apr 2010 13:08
dagmargoodboat(a)yahoo.com wrote: > On Apr 7, 9:48 pm, Joerg <inva...(a)invalid.invalid> wrote: >> dagmargoodb...(a)yahoo.com wrote: >>> On Apr 7, 7:06 pm, Joerg <inva...(a)invalid.invalid> wrote: > >>>> There's actually three more models around but they essentially behave >>>> similar. Thing is, the chip is not supposed to turn off the switch >>>> during the positive ramp because the comparator does not tie into the >>>> reset input of the register, only the set input. >>>> <scratching_ head> >>> Yeah. I read TI's app note. So it can start an ON cycle any time >>> during ramp up, but can't ever stop until ramp-down. Crude. Burp, >>> sputter, and cough, in this application. >> Well, if it did that I'd be happy. But it does cut during ramp-down and >> according to the internal wire-up it's not supposed to. Helmut >> Sennewald, one of the LTSpice gurus, could not reproduce the error I >> saw. Sent him my file, so we'll see. > > It's s'posed to cut off during ramp-down--that's when the flop gets > reset, unconditionally. So says TI, anyhow. > > http://focus.ti.com/lit/an/slva252b/slva252b.pdf > > the operative paragraph being the last one pg. 5. And, the last > comment in Table 1 confirms: > > "Output switch conduction is always > terminated when Ct is ramping down." > I know but as shown in my sim plot if is terminated before Ct is ramping down. That not s'posed to happen. But does, at least according to SPICE. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. |