Inside

• Optoislated feedback amplifier with 1.24 V precision voltage reference
• EVM available for TLC320AD50 DSP analog interface
• 300 DPI linear sensor array with hold
• Precision Hi-Speed Light-to-Voltage Converters
• Low-power rail-to-rail op amps in SOT-23
• High output drive rail-to-rail op amp consumes only 50 µA per channel
• New CD-based "Designer's Guide and Data Book" allows for powerful searches
• 2.5 V Power management for DSP systems
• EVM available for TLC320AD75C ADA converter
• Programmable gain select is added to TI's combo family
• Single chip interface solution for the 9-pin GeoPort™ host
• 400 Mbps, high-speed data transmission
• PCI1220/1250A: Industry-leading CardBus soltions for tomorrow's applications
• Universal Serial Bus (USB) hub solutions

Optoisolated feedback amplifier with 1.24 V precision voltage reference

Product Features

• Integrated precision reference and opto-coupler
• 1.0% Reference voltage tolerance
• 2 Current transfer ratios: 100% to 400%, and 150% to 300%
• Characterized for operation from –40°C to 100°C

The design of the isolated feedback loop for off-line 3.3 V switch mode power supplies has become easier and more cost effective with the introduction of the TPS5908/10 Opto-Isolated Feedback Amplifier. The TPS5908/10 consists of the TLV431 (1.24 V programmable voltage reference with 1% reference voltage tolerance) and an opto-coupler in the same 8-pin package. These devices are primarily intended for use as the combination, error, reference, and isolation amplifier in isolated 3.3 V AC/DC power supplies and DC/DC converters. This device provides reduced component count and saves space without sacrificing performance.

The opto-coupler portion is a 940 nm GaAs LED and a silicon phototransistor. The LED has a typical forward voltage of 1.2 V. The TPS5908/10 operates as a comparator with an optically coupled output. The TPS5910 is identical to the TPS5908 with the added feature of having the base of the phototransistor brought out to an external pin which provides greater flexibility in loop design.

Both of these devices are available in two different ranges of current transfer ratios (CTR). The CTR range for the standard device is 100% to 400% and for the ‘A’ versions the CTR is 150% to 300%.

The TPS5908/10 is available in an 8-pin DIP and an 8-pin Gull-wing package (DCS).

• TPS5908
• TPS5908A
• TPS5910
• TPS5910A