UCC2975, UCC2976, UCC2977

UCC3975, UCC3976, UCC3977

SLUS499A – NOVEMBER 2001 – REVISED JANUARY 2002

6

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Terminal Functions

TERMINAL

NO.

NAME

UCCx975

UCCx976

UCCx977

I/O

DESCRIPTION

COMP

3

O

Output of the error amplifier and control voltage used to set the VCO frequency

FB

4

I

Inverting input to the error amplifier

GND

5

O

Ground reference for the device

OPEN/SD

1

I

Open lamp protection and a low power shut down

OSC

2

I

Common connection point for components that control the frequency range for the voltage con-

trolled oscillator (VCO)

OUTP/OUT1

7

O

Output of an internal CMOS driver used to drive an N-channel MOSFET (for UCC3977), or a

P-channel MOSFET (for UCC3976) left open for UCC3975

OUTN/OUT2

6

O

Output of an internal CMOS driver used to drive an N-channel MOSFET.

VDD

8

O

Connects to the battery or system voltage

1

2

3

4

8

7

6

5

OPEN/SD

OSC

COMP

FB

VDD

OUTP

OUTN

GND

UCC2975, UCC2976

UCC3975, UCC3976

PW PACKAGE

(TOP VIEW)

1

2

3

4

8

7

6

5

OPEN/SD

OSC

COMP

FB

VDD

OUT1

OUT2

GND

UCC2977, UCC3977

PW PACKAGE

(TOP VIEW)