Beko K1 CHASSIS Service Manual page 18

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Low Power Consumption
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Very Low Start-up Current
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Soft-Start for noiseless Start-up
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Standby Burst Mode with and without
Control Signal for lowered Output Voltages
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Digital Frequency Reduction in small Steps
at Decreasing Load
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Over- and Undervoltage Lockout
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Switch Off at Mains Undervoltage
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Mains Voltage Dependent Fold Back Point
Correction
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Ringing Suppression Time Controlled from
Output Voltage
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Easy Design In
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Free usable Fault Comparator
Functional Description
The ICE1QS01 is optimized to control free running flyback converters with and without Power Factor
Correction (with PFC Charge Pump). The switching frequency is reduced in small steps with
decreasing load towards a minimum of 20 kHz in standby mode. This function is performed by a digital
circuit to avoid any jitter also with periodically pulsed loads. To provide extremely low power
consumption at light loads, this device can be switched into Standby Burst Mode. This is also possible
without standby control signal (for adapter application). Additionally, the start up current is very low. To
avoid switching stresses of the power devices, the power transistor is always switched on at minimum
voltage. The device has several protection functions: VCC overand undervoltage, mains undervoltage
and current limiting. Regulation can be done by using the internal error amplifier or an opto coupler
feedback. The output driver is ideally suited for driving a power MOSFET. The ICE1QS01 is suited for
TV-sets, VCR- sets, SAT- receivers and other consumer applications in the power range from 0 to app.
300 W.
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