●Half Bridge Controller and Driver for Industrial Linear Tubes
●The MC33157 includes the oscillator circuit and two output channels to control a half–bridge power stage.
●One of the channels is ground–referenced. The second one is floating to provide a bootstrap operation for the high side switch.
●Dedicated Driver for Industrial Linear Tubes
●•Main oscillator is current controlled, making it easy to set up by a single external resistor. On top of that, such a feature is useful to implement a dimming function by frequency shift.
●•Filament pre–heating time control built–in.
●•The strike sequence is controllable by external passive components, the resonnant frequency being independently adjustable. This frequency can be made different from the pre–heating and the steady state values. A frequency sweep between two defined values makes this IC suitable for any series resonnant topologies.
●•Dedicated internal comparator provides an easy lamp strike detection implementation.
●•Digital RESETpin provides a fast reset of the system (less than 10µs).
● Both output MOSFET are set to “OFF” state when RESETis zero.
●•Adjustable dead time makes the product suitable for any snubber capacitor and size of MOSFET used as power switches.
●•Designed to be used with standard setting capacitors ≤470nF.
●•A voltage reference, derived from the internal bandgap, is provided for external usage. This voltage is 100% trimmed at probe level yielding a 2% tolerance over the temperature range.
