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ICE3AR10080CJZ Datasheet(PDF) 10 Page - Infineon Technologies AG |
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ICE3AR10080CJZ Datasheet(HTML) 10 Page - Infineon Technologies AG |
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10 / 33 page  CoolSET®-F3R80 ICE3AR10080CJZ Functional Description Version 2.0 10 11 Jan 2012 7). It allows the duty cycle to be reduced continuously till 0% by decreasing VFBB below that threshold. Figure 7 Light Load Conditions 3.3.1 PWM-OP The input of the PWM-OP is applied over the internal leading edge blanking to the external sense resistor RSense connected to pin CS. RSense converts the source current into a sense voltage. The sense voltage is amplified with a gain of 3.25 by PWM OP. The output of the PWM-OP is connected to the voltage source V1. The voltage ramp with the superimposed amplified current signal is fed into the positive inputs of the PWM- Comparator C8 and the Soft-Start-Comparator (Figure 8). 3.3.2 PWM-Comparator The PWM-Comparator compares the sensed current signal of the integrated CoolMOS® with the feedback signal VFBB (Figure 8). VFBB is created by an external optocoupler or external transistor in combination with the internal pull-up resistor RFB and provides the load information of the feedback circuitry. When the amplified current signal of the integrated CoolMOS® exceeds the signal VFBB the PWM-Comparator switches off the Gate Driver. Figure 8 PWM Controlling 3.3.3 Slope Compensation Due to the sub harmonic oscillation of CCM operation when duty cycle is larger than 50%, the slope compensation is added. The slope Mc; 50mV/ms is added to the current sense pin when gate is on. During burst mode operation, the Mc slope is shut down and no slope added into the current sense signal. This can save the power consumption at burst mode. Figure 9 Slope compesnation t t VOSC 0.6V FBB t max. Duty Cycle Gate Driver Voltage Ramp 156ns time delay X3.25 PWM OP Improved Current Mode PWM Comparator CS Soft-Start Comparator 5V C8 0.6V FBB Optocoupler RFB PWM-Latch x3.25 PWMOP Gate Drive signal C8 0.62V Mc=50mV/us Slope compensation PWM comparator S5 5.0V 10k D2 1pF LEB 180/220ns Rslope FB Active burst mode PWMlatch CS |
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