TPS5904, TPS5904A

OPTOISOLATED FEEDBACK AMPLIFIERS

TAOS017 – SEPTEMBER 1999

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and an Optocoupler in a Single Package

– TPS5904

0.8%

– TPS5904A

0.5%

– TPS5904

100% to 400%

– TPS5904A

150% to 300%

for 1 Minute

– UL

– 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 a precision programmable reference

and an optocoupler. Reference-voltage tolerance for the TPS5904 is 0.8%, and for the TPS5904A is 0.5%.

These 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 and each device is supplied

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

Typical Application

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TPS5904/A

PWM

Control

R1

R2

TPS5904: Reference-voltage tolerance, 0.8%

CTR Range, 100% to 400%

TPS5904A: Reference-voltage tolerance, 0.5%

CTR Range, 150% to 300%

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Copyright

© 2000, TAOS Inc.

Texas Advanced Optoelectronic Solutions Inc.

800 Jupiter Road, Suite 205

S Plano, TX 75074 S (972) 673-0759

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LED

COMP

GND

FB

NC

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NC

DCS OR P PACKAGE

(TOP VIEW)

NC – No internal connection