CR6202 Просмотр технического описания (PDF) - Unspecified
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CR6202 Datasheet PDF : 14 Pages
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CR6202
4. Driving characteristic and high voltage endurance bias technology of power tube
The power tube adopts the ramp current drive, the driving current will increase with the output power,
when FB is 0, the current of OB is about 24mA, when FB is 6V, the current of OB is about 40mA, and the
driving power consumption will decrease remarkably when the output is low.
The interior of IC integrates the particular bias technology, when the power tube is shut, the output of OB
will be pulled down to the ground, meanwhile, it will bias the output of OE to 1.5V or so, bias the emitter
junction, accelerate the decreasing speed of Ic current, expand the effective safe working area, the switching
tube affords the reverse voltage CB, therefore, the endurance characteristic of the switching tube can be up to
700V. For more detail information for the voltage endurance characteristic of the switching tube, please refer to
the relevant technical data.
5. Over-voltage and under-voltage protection
IC has the function of slow-moving under-voltage protection, when the voltage of VCC reaches 8.8V, IC
will set out to start, the initial start-up voltage is provided by the driving resistance, the high voltage of input
will be injected into the base of the switching tube through Ic current, consequently, the driving voltage is
formed. When IC works normally, the voltage of VCC should be keep between 4.8V and 9V (including the
situation of full load output), if the voltage of VCC falls to 4.2V, the oscillator will enter the state of shutoff,
when it decreases to 3.6V further, IC will begin to reset. As shown in the following figure:
VCC in side IC is provided with a comparator controller of the upper limit voltage, if VCC tries to be more
than 10V, the comparator will work, FB will be pulled down, and it will lock VCC to 10V, and reach the limit
Aug.2008 V2.0
9/14
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