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UCC284: UUC284DP-12

Part Number: UCC284

HI Folks:

New to the design world, and want to use the UCC284DP-12 negative 12 volt regulator. I want to insure I am understanding the data sheet application information correctly. I basically want a -12V regulated source of about 1mA. The data sheet indicates various components connected to various pins of this chip. My understanding is I need to use the following shown on pp. 6 of the data sheet.

1. 1uf Cap low ESR between the Vin (-15 V dc in my case) to the output/input return or ground line.

2. 4.7 uf cap between the Vout (-12V in my case) to the output/input return or ground line.

3. 0.015 uf  timing cap between the SD/CT pin and output/input return or ground line.

4. Pin 4 on the chip tied to the output/input return or ground line.

5. Pins Vin (2, 3, 6, 7) tied to -15V dc input 

6. Pins Vout (5) tied to Vouts(1) tied together.

So since pins 1& 5 are tied together  the cap C1, 20 pf is not needed. Since this is a xxxxxxxx-12 chip the resistors R1 & R2 are not needed to set the voltage.

The CT cap = 0.015pf that was mentioned in step 3 limits the current under output short circuit conditions, but I am assuming does not have any influence otherwise, so I need to make sure I am getting a ma out.  Could you please verify my interpretation of the data sheet described above.

Thanks,