LTC1923EUH#PBF

LINEAR TECHNOLOGY  LTC1923EUH#PBF  热电冷却控制器, 5.5V-2.7V电源, 225 kHz, QFN-32

The is a Pulse Width Modulator intended for thermoelectric cooler TEC or heater applications requiring either unidirectional or bidirectional drive circuits. All of the necessary control circuitry and two sets of complementary output drivers are integrated into the LTC1923 to drive a full bridge, providing an efficient means of bidirectional current flow to the TEC. An accurate temperature control loop to stabilize the temperature of a laser diode system is easily achieved with the addition of just a few external components. Typical temperature set point accuracy of 0.1°C is achievable with the LTC1923. Adding an instrumentation amplifier front end allows set point stability of 0.01°C. The part features independent adjustable heating and cooling pulse-by-pulse current limit, current soft-start for controlled start-up, output slew rate control to reduce system noise, differential current sense and voltage amplifiers and a host of auxiliary circuits to protect the laser.

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High efficiency low noise topology

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Adjustable output slew rate reduces EMI

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Full-bridge controller for bidirectional current control

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Adjustable pulse-by-pulse bidirectional TEC current limit

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Open/shorted thermistor indication

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TEC Voltage clamping

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TEC Current, voltage and heat/cool status outputs

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Adjustable/synchronizable oscillator frequency reduces filter component size and system noise