UAC3092

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

3 of 9

www.unisonic.com.tw

QW-R101-017,B

PIN DESCRIPTION

20-pin

Package

24-pin

Package

PIN No.

PIN NAME

DESCRIPTION

1

1

FB

This pin provides a filtered result of the Sense input (if the Sense input is used)

or the Supply Regulation input (if the Sense input is not used).

2

2

Sense

The Sense input is a remote, low current battery voltage reference input used

to give an accurate representation of the true battery voltage. This input is also

used to monitor overvoltage or load dump conditions.

3

3

Lamp

Collector and

Power-Up/Do

wn

This pin connects to the collector of the transistor (Q2) used to drive the fault

lamp. It is also used to sense a closed ignition switch (voltage sense) which

then turns power on to the IC.

4

4

Lamp Base

The Lamp Base pin provides base current to the fault lamp drive transistor

(Q2).

5

5

Ground

Grounded to provide a ground return for the fault lamp control logic circuit.

6, 15

6,15

Ground

IC ground reference pins.

7

7

Oscillator

Adjust

A resistor to ground on this pin adjusts the internal oscillator frequency.

8

8

This is a test point for the 1.1V to 1.4V reference voltage. It has a zero

temperature coefficient. The reference is used internally for phase signal and

undervoltage detection.

9

9

Oscillator

Test point for checking the operation of the internal oscillator.

10

10

Phase

The Phase input detects the existence of a magnetic field rotating within the

alternator.

11

11

Rate

The Rate pin is used to select a slow mode (floating) or fast mode (ground)

Load

Response Control recovery rate.

12

12

Supply

Regulation

The voltage on the Supply Regulation pin is used as a representation of the

alternator output voltage. This input also used to monitor overvoltage or load

dump conditions.

13

13

Positive supply for the internal Charge Pump.

14

14

Positive supply for the entire IC except for the Charge Pump.

15,6

15,6

Ground

Ground reference for the IC.

16

16,17,18,

19,20

N/C

No connection.

17

21

Gate

Controls the Gate of the MOSFET used to energize the field winding.

18

22

Source

Field winding control MOSFET source reference.

19

23

Undervoltage

If the voltage at this pin goes below 1.0 V, the fault lamp is guaranteed to turn

on. The IC will continue to function, but with limited performance.

20

24

Test point for the 1.7 V to 2.3 V Band gap reference voltage. This voltage has

a negative temperature coefficient of approximately –11 mV/℃

Note:

Pins 8, 9, 20(20 Pin Package) and 24(24 Pin Package) are test points only.