TPS5100

TRIPLE-CHANNEL PWM CONTROL CIRCUITS

SLVS169 – JANUARY 2000

1

POST OFFICE BOX 655303

(f = 500 kHz, Duty = 50%)

1 MHz

(25

°C)

Function Table)

description

The TPS5100 is a triple PWM control circuit, primarily designed to compose the power supply for LCD display.

Each PWM channel has own error amplifier, PWM comparator, dead-time control and output driver. The

trimmed voltage reference, oscillator, undervoltage lockout and short circuit protection are common for all

channels.

This device includes two boost exclusive circuits (ch1,3) and a buck-boost exclusive circuit (ch2). The operating

frequency is set with external resister and capacitor, and dead time is continuously adjustable form 0% to 100%

duty cycle with resistive divider network. Soft start function can be implemented by adding a capacitor to dead

time divider network. Two dead time control inputs are assigned for ch1,3 pair and ch2 individually and each

dead time control input can be used to control on/off operation. TPS5100 can operate from 2.5 V supply voltage

and ch1,3 pair and ch2 operate with reverse phase switching each other to achieve efficient operation in low

power and battery powered system.

The TPS5100 is characterized for operation from –20

°C to 85°C.

FUNCTION TABLE

CONDITION

OUTPUT

CONDITION

CH-1

CH-2

CH-3

DTC1/3 >. 0.3 V, DTC2 > 0.3 V

ON H

ON L

ON H

DTC1/3 > 0.3 V, DTC2 <. 0.2 V

ON H

OFF H

ON H

DTC1/3 < 0.2 V, DTC2 > 0.3 V

OFF L

ON L

OFF L

DTC1/3 < 0.2 V, DTC2 < 0.2 V

OFF L

OFF H

OFF L

AVAILABLE OPTIONS

PACKAGE

TA

TSSOP

(PW)

–20

°C to 85°C

TPS5100PW

Copyright

© 2000, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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9

IN-2

E/O2

OUT2

OUT3

OUT1

GND

SCP

E/O3

IN-3

IN-1

E/O1

DTC2

DTC1/3

PW PACKAGE

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