TPS5904, TPS5904A

OPTOISOLATED FEEDBACK AMPLIFIERS

SOES016D − MAY 1995 − REVISED JANUARY 1998

1

POST OFFICE BOX 655303

POST OFFICE BOX 1443

(2.5 V) and an Optocoupler in a Single

Package

− TPS5904

0.8%

− TPS5904A

0.4%

− TPS5904

100% to 400%

− TPS5904A

150% to 300%

for 1 Minute

− UL . . . File Number E65085

− FIMKO, SEMKO, NEMKO, DEMKO

− EN60065/IEC 65

− EN60950/IEC 950

− VDE 0884, Level 4 (6000-V Insulation)

description

The TPS5904 and TPS5904A optoisolated feedback amplifiers consist of the industry standard TL1431

precision programmable reference and an optocoupler. Reference-voltage tolerance for the TPS5904 is

0.8%, and for the TPS5904A, 0.4%. The devices are primarily intended for use as the error-amplifier/reference/

isolation-amplifier element in isolated ac-to-dc power supplies and dc/dc converters. The optocoupler is a

gallium-arsenide (GaAs) light-emitting diode that emits at a wavelength of 940 nm, combined with a silicon

phototransistor. The current transfer ratio (CTR) ranges from 100% to 400% in the standard version. The

TPS5904A version with a 150%-to-300% CTR is available for higher-performance applications. When using

the TPS5904 or TPS5904A, power-supply designers can reduce component count and save space in tightly

packaged designs. The tight-tolerance reference eliminates the need for adjustments in many applications.

The TPS5904 and TPS5904A are characterized for operation from −40

°C to 100°C. Each device is supplied

in an 8-pin DIP or in an 8-pin gull-wing surface-mount package (DCS).

typical application

1

2

4

3

7

6

TPS5904/A

PWM

Control

R1

R2

TPS5904: Reference-voltage tolerance, 0.8%

CTR Range, 100% to 400%

TPS5904A: Reference-voltage tolerance, 0.4%

CTR Range, 150% to 300%

+

+

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.

Copyright

 1998, 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.

1

2

3

4

8

7

6

5

LED

COMP

GND

FB

NC

C

E

NC

DCS OR P PACKAGE

(TOP VIEW)

NC − No internal connection