Catalog
Ultracompact 1.5 A Thermoelectric Cooler (TEC) Controller
Key Features
• Patented high efficiency single inductor architecture
• Integrated low RDSONMOSFETs for the TEC controller
• TEC voltage and current operation monitoring
• No external sense resistor required
• Independent TEC heating and cooling current limits settings
• Programmable maximum TEC voltage
• 2.0 MHz PWM driver switching frequency
• External synchronization
• Two integrated zero drift, rail-to-rail chopper amplifiers
• Capable of NTC or RTD thermal sensors
• 2.50 V reference output with 1% accuracy
• Temperature lock indicator
• Available in a 25-ball, 2.5 mm × 2.5 mm WLCSP or in a 24-lead, 4 mm × 4 mm LFCSP
• AEC-Q100 qualified for automotive applications
Description
AI
The ADN88341is a monolithic TEC controller with an integrated TEC controller. It has a linear power stage, a pulse-width modulation (PWM) power stage, and two zero-drift, rail-to-rail operational amplifiers. The linear controller works with the PWM driver to control the internal power MOSFETs in an H-bridge configuration. By measuring the thermal sensor feedback voltage and using the integrated operational amplifiers as a proportional integral differential (PID) compensator to condition the signal, the ADN8834 drives current through a TEC to settle the temperature of a laser diode or a passive component attached to the TEC module to the programmed target temperature.The ADN8834 supports negative temperature coefficient (NTC) thermistors as well as positive temperature coefficient (PTC) resistive temperature detectors (RTD). The target temperature is set as an analog voltage input either from a digital-to-analog converter (DAC) or from an external resistor divider.The temperature control loop of the ADN8834 is stabilized by PID compensation utilizing the built in, zero drift chopper amplifiers. The internal 2.50 V reference voltage provides a 1% accurate output that is used to bias a thermistor temperature sensing bridge as well as a voltage divider network to program the maximum TEC current and voltage limits for both the heating and cooling modes. With the zero drift chopper amplifiers, extremely good long-term temperature stability is maintained via an autonomous analog temperature control loop.APPLICATIONSTEC temperature controlOptical modulesOptical fiber amplifiersOptical networking systemsInstruments requiring TEC temperature control1Product is covered by U.S. Patent No. 6,486,643.
