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ICE2B765I Datasheet(PDF) 10 Page - Infineon Technologies AG |
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ICE2B765I Datasheet(HTML) 10 Page - Infineon Technologies AG |
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10 / 36 page  Version 2.6 10 25 Dec 2006 CoolSET™-F2 Functional Description 3 Functional Description 3.1 Power Management Figure 6 Power Management The Undervoltage Lockout monitors the external supply voltage VVCC. In case the IC is inactive the current consumption is max. 55µA. When the SMPS is plugged to the main line the current through RStart-up charges the external Capacitor CVCC. When VVCC exceeds the on-threshold VCCon=13.5V the internal bias circuit and the voltage reference are switched on. After that the internal bandgap generates a reference voltage VREF=6.5V to supply the internal circuits. To avoid uncontrolled ringing at switch-on a hysteresis is implemented which means that switch-off is only after active mode when Vcc falls below 8.5V. In case of switch-on a Power Up Reset is done by resetting the internal error-latch in the protection unit. When VVCC falls below the off-threshold VCCoff=8.5V the internal reference is switched off and the Power Down reset let T1 discharging the soft-start capacitor CSoft-Start at pin SoftS. Thus it is ensured that at every switch-on the voltage ramp at pin SoftS starts at zero. 3.2 Improved Current Mode Figure 7 Current Mode Current Mode means that the duty cycle is controlled by the slope of the primary current. This is done by comparison the FB signal with the amplified current sense signal. Figure 8 Pulse Width Modulation In case the amplified current sense signal exceeds the FB signal the on-time Ton of the driver is finished by resetting the PWM-Latch (see Figure 8). The primary current is sensed by the external series resistor RSense inserted in the source of the integrated CoolMOS™. By means of Current Mode regulation, the Internal Bias Voltage Reference 6.5V 4.8V Undervoltage Lockout 13.5V 8.5V Power-Down Reset Power-Up Reset Power Management 5.3V 4.0V T1 PWM-Latch R S Q Q Error-Latch SoftS 6.5V Error-Detection VCC Main Line (100V-380V) Primary Winding Soft-Start Comparator C VCC R Soft-Start R Start-Up C Soft-Start x3.65 PWM OP Improved Current Mode 0.8V PWM Comparator PWM-Latch Isense FB R S Q Q Driver Soft-Start Comparator t FB Amplified Current Signal T on t 0.8V Driver |
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