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DESCRIPTION (CONTINUED)

ABSOLUTE MAXIMUM RATINGS

DISSIPATION RATINGS

RECOMMENDED OPERATING CONDITIONS

TPS68000

SLVS524 – OCTOBER 2005

These devices have limited built-in ESD protection. The leads should be shorted together or the device

placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.

To start the lamp, an automatic strike control is implemented. It smoothly increases the lamp voltage by

sweeping the operating frequency across the self resonance frequency of the transformer-series capacitor

resonant circuit. During this time the maximum lamp voltage is limited and regulated by a voltage control loop

until the lamp current increases to a value allowing the current control loop to take over control. The lamp current

is regulated over a wide current range. To set the lamp brightness, analog and PWM dimming circuits are

implemented. Analog and PWM dimming can be used independent of each other to control lamp brightness over

a wide range.

To protect the circuit during fault conditions, for example broken, disconnected, or shorted lamps, overvoltage

protection and overcurrent protection circuits are implemented. To protect the TPS68000 from overheating, an

internal temperature sensor is implemented that triggers controller turn-off at an excessive device temperature.

The device is packaged in a 30-pin TSSOP package measuring 6,4 mm x 7,8 mm (DBT).

ORDERING INFORMATION

PACKAGE

–40

°C to 85°C

30-Pin TSSOP

TPS68000DBT

(1)

The DBT package is available taped and reeled. Add R suffix to device type (e.g., TPS68000DBTR) to order quantities of 2000 devices

per reel.

TPS68000

Input voltage range on VCC, EN, FAULT

–0.3 V to 33 V

Input voltage range on SYNC, SET, PH, STC, ABR, BBR, BF, BC, VREF, VA-, VAO, CA-, CAO

–0.3 V to 6 V

Input voltage range on VSEN, CSEN, OCP

–6 V to 6 V

Input voltage range on GD, GB, V5

–0.3 V to 6 V

maximum differential voltage between GA, V5A and SA

6V

maximum differential voltage between GC, V5C and SC

6V

maximum differential voltage between SA and PGND

35V

maximum differential voltage between SC and PGND

35V

–40

°C to 150°C

–65

°C to 150°C

(1)

Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated uner "recommended operating

conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

THERMAL RESISTANCE

POWER RATING

DERATING FACTOR

POWER RATING

POWER RATING

PACKAGE

θ

JA

DBT

63.9

°C/W

1565 mW

16 mW/

°C

860 mW/

°C

626 mW/

°C

MIN

NOM

MAX

UNIT

Supply voltage at VCC

8.0

30

V

Operating free air temperature range

–40

85

°C

Operating virtual junction temperature range

–40

125

°C

2