Si7904DN

The Si7904DN is designed as one kind of monolithic controller that can be used in (1)thermoelectric cooler (TEC) temperature control; (2)resistive heating element control; (3)temperature stabilization substrate (TSS) control applications. This device relies on a negative temperature coefficient (NTC) thermistor and the loop is stabilized by a PID compensation amplifier with high stability and low noise.

Features of the Si7904DN are:(1)high efficiency; (2)small size: 5 mm x 5 mm LFCSP; (3)low noise: <0.5% TEC current ripple; (4)long-term temperature stability: +/-0.01; (5)temperature lock indication; (6)temperature monitoring output; (7)oscillator synchronization with an external signal; (8)clock phase adjustment for multiple controllers; (9)programmable switching frequency up to 1 MHz; (10)thermistor failure alarm; (11)maximum TEC voltage programmability.

The absolute maximum ratings of the Si7904DN can be summarized as:(1)Supply Voltage: 6 V;(2)Input Voltage: GND to VS + 0.3 V;(3)Storage Temperature Range: -65°C to +150°C;(4)Operating Temperature Range: -40°C to +85°C;(5)Operating Junction Temperature: 125°C;(6)Lead Temperature Range (Soldering, 10 sec): 300°C.

The electrical characteristics of this Si7904DN can be summarized as:(1)Long-Term Stability: 0.01 °C;(2)Output Transition Time: 20 ns;(3)Nonoverlapping Clock Delay: 50 to 65 ns;(4)Output Resistance: 6 ;(5)Output Voltage Swing: 0 to VDD V;(6)Output Voltage Ripple: 0.2 %;(7)Output Current Ripple: 0.2 %;(8)Output Resistance: 85 ;(9)Output Voltage Swing: 0 to VDD V. If you want to know more information about it, please download the datasheet in www.seekic.com or www.chinaicmart.com .