PWM controller IC operates at temperatures as high as 225°C
By Paul Rako, Technical Editor -- EDN, October 12, 2009
Cissoid has introduced the Magma switching-power-supply PWM (pulse-width-modulator)-controller chip, which operates with 6 to 30V inputs and provides duty cycles up to 90%. The device operates at −55 to +225°C, and shutdown current is less than 150 μA at 225°C. You can synchronize the chip to an external clock, and a clock-output pin makes the internal clock available. Other features include an internal reference, input-voltage feedforward, and a soft-start function when the device comes out of standby or when you enable the outputs. You can adjust the voltage threshold of the power-good output pin. The device works with the company’s Hyperion transistor-driver chip, which also operates at 225°C. This chip set can drive high-temperature silicon-carbide transistors, FETs, or high-reliability IGBTs (insulated-gate bipolar transistors). The parts complement the company’s line of regulators, amplifiers, ADCs, logic, and P- and N-channel FETs, all of which operate at temperatures as high as 225°C.
Magma provides PWM control for down-hole oil-well instrumentation, aeronautics, train, and automotive applications. It comes in a ceramic DIL-28 package and sells for $312.70 (200).
