Need help identifying thie PWM chip

Jul 18, 2009 5 Replies
M

I have piece a datasheet from a PWM chip and would like to identify the part number.



Its an old voltage mode 16 pin dip part for half/fullbridge.



It has a 4V built in reference (wide tolerance). Uses a resistor strap to set the PWM freq up to 1MHz. Bi-Cmos Has a Ct and DIScharge pin on the oscillator cap. Dual 500mA totem pole outputs.



45 - 49% max duty cycle Softstart pin Shutdown pin Typical in+, in- and COMP pins

Datasheet was in Times New Roman font. Most stuff in in areal now.



When I get a change I'll scan the part of the datasheet I have and post it. Maybe it will ring a few bells.



thanks.


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W

art

t.

Parts like TI's Unoin Carbide classic uc1525, 27 and uc3846, 47 families look familiar. But they have Vref =3D 5.1 volts.

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M

Parts like TI's Unoin Carbide classic uc1525, 27 and uc3846, 47 families look familiar. But they have Vref = 5.1 volts.

Thats what is throwing me. The 4V reference and the times font in the datasheet. I looked throug all the UC1 datasheets (prbably a cerdip) and couldn't find a voltage mode from unitrode with 4V reference. :(

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J

something like this?

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formatting link
Excuse the quality.

P.S. there are newer types that most likely will do the same.

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M

Thats not it. I'll post the fragment when I get to the office monday. When I first saw it I thought it was a unitrode part. Looked throught my old

1990 unitrode catalog and none of the datasheets were in times new roman font and none of the voltage mode PWMs I could find had a seperate discharge pin for Ct or a 4V reference. :(

I'm looking for this because this part is in a old multi-chip-module that I need to debug. The M-C-M datasheet has a segment of the PWM IC datasheet, and sparce interface information. I would like to get the full PWM IC datasheet so I can read up on the particulars of it to help in debugging.

thanks and keep scratching your heads for me please.

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M

Found it!

It was an old Telcom TC24C24

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