Si7904DN Datasheet | Analog Devices

Thermoelectric Cooler Controller ADN8830 Features High Efficiency Small Size: 5 mm ؋ 5 mm LFCSP Low Noise: <0.5% TEC Current Ripple Long-Term Temperature Stability: ؎0.01؇ C Temperature Lock Indication Temperature Monitoring Output Oscillator Synchronization with an External Signal Clock Phase Adjustment for Multiple Controllers Programmable Switching Frequency up to 1 MHz Thermistor Failure Alarm Maximum TEC Voltage Programmability APPLICATIONS Thermoelectric Cooler (TEC) Temperature Control Resistive Heating Element Control Temperature Stabilization Substrate (TSS) Control GENERAL DESCRIPTION The ADN8830 is a monolithic controller that drives a thermoelectric cooler (TEC) to stabilize the temperature of a laser diode or a passive ponent used in telemunications equipment. This device relies on a negative temperature coefficient (NTC) thermistor to sense the temperature of the object attached to the TEC. The target temperature is set with an analog input voltage either from a DAC or an external resistor divider. The loop is stabilized by a PID pensation amplifier with high stability and low noise. The pensation network can be adjusted by the user to optimize temperature settling time. The ponent values for this network can be calculated based on the thermal transfer function of the laser diode or obtained from the lookup table given in the Application Notes section. Voltage outputs are provided to monitor both the temperature of the object and the voltage across the TEC. A voltage reference of 2.5 V is also provided. FUNCTIONAL BLOCK DIAGRAM PID PENSATION NETWORK FROM THERMISTOR TEMPERATURE SET INPUT VREF P-CHANNEL (UPPER MOSFET) TEMPERATURE MEASUREMENT AMPLIFIER PWM CONTROLLER MOSFET DRIVERS P-CHANNEL (LOWER MOSFET) N-CHANNEL N-CHANNEL VOLTAGE...