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PIN ASSIGNMENTS

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

SYNC

SET

STC

PH

BBR

BC

BF

ABR

VAO

VA−

VSEN

CA−

CAO

CSEN

OCP

VREF

GND

SA

GA

V5A

GB

VCC

V5

PGND

GD

V5C

GC

SC

EN

FAULT

TPS68000

SLVS524 – OCTOBER 2005

DBT PACKAGE

(TOP VIEW)

Terminal Functions

TERMINAL

I/O

DESCRIPTION

NAME

NO.

ABR

8

I

Analog brightness programming input. A DC voltage applied at that pin programs the lamp current

the current regulator regulates. 0 V means no current and 3.3 V means maximum current.

BBR

5

I

Burst brightness programming input. A DC voltage applied at that pin programs the duty cycle of the

burst pulses generated to dimm the brightness. 0 V means zero duty cycle and 2 V means

maximum duty cycle. Applying V5 (5 V) programs the device for synchronized burst dimming.

BC

6

I

Burst control. A PWM signal applied at that pin is directly used for burst dimming. Frequency and

duty cycle are used directly. This input has priority against the burst frequency programming with

BBR and BF

BF

7

I

Burst frequency programming. A capacitor at that pin programs the low frequency for the burst

dimming

CA-

12

I

Current amplifier negative input. This input is used to connect the compensation capacitor for

compensating the current loop.

CAO

13

O

Current amplifier output. This is the output for the current amplifier. It is used to connect the

compensation capacitor for the current loop.

CSEN

14

I

Current sense. Measuring input for the lamp current. The applied voltage (coming from a shunt

resistor) will be used for lamp current regulation. Sensed AC voltages can be applied directly. They

will be rectified internally.

EN

17

I

Enable input. Logic high enables the device.

FAULT

16

O

Error output, any detected malfunctioning of the application will be reported as error on this pin.

Error means the output is pulled low. The output is open drain to allow connecting multiple error

outputs of similar devices together.

GA

27

O

Gate drive output of switch A

GB

25

O

Gate drive output of switch B

GC

19

O

Gate drive output of switch C

GD

21

O

Gate drive output of switch D

GND

29

Analog ground pin. Reference ground for all control signals.

OCP

15

I

Over current protection. This input is used to monitor a voltage derived from a current sensor in any

part of the converter. This voltage is compared to an internal reference voltage. Exceeding the

internal reference voltage causes the device logic to turn the device off and report an error signal at

the fault pin.

PGND

22

Reference ground for the gate drivers and the gate drive supply.

6