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HS01G Datasheet(PDF) 8 Page - Infineon Technologies AG |
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HS01G Datasheet(HTML) 8 Page - Infineon Technologies AG |
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8 / 18 page  Version 2.0 8 24 August 2009 Half-Bridge Resonant Controller ICE1HS01G Functional description Figure 5 FMIN versus RFMIN 3.1.2 Feedback regulation The output information is fed into the controller through feedback voltage. If the output power is higher, the feedback voltage will be higher, which will cause the switching frequency to decrease and vice versa. The regulation of switching frequency is achieved by changing the charging current. An accurate operational transconductance amplifier (OTA) is used to translate the feedback voltage VFB into current IFB. The effective range of feedback voltage is from 0.9V to 3.9V. Figure 6 graphs the relationship between the actual switching frequency and feedback voltage VFB when RFMIN=22kohm. Figure 6 Switching frequency versus VFB Burst mode operation is also provided by ICE1HS01G. During LLC operation, the feedback signal VFB is continuously monitored. When VFB drops below VFB_off , the switching signal will be disabled after a fixed blanking time TFB. VFB will then rise as Vout starts to decrease due to no switching signal. Once VFB exceeds the threshold VFB_on, the IC resumes to normal operation. 3.1.3 Current sense current ICS In LLC resonant topologies, it is necessary to limit the resonant current in case of short circuit or other fault conditions. It is achieved by adding another current Ics to the charging current Ichg. ICS is limited to 3 times of the minimum charge current. 3.1.4 Soft start current ISS To limit the inrush current and output overshoot during start up, the switching frequency shall be necessary high at start up. The switching frequency will change gradually toward the minimum switching frequency until the feedback voltage comes into regulation. The switching frequency will then go to desired value according to load and input conditions. The soft start current Iss also has a upper limit of around 3.4 times of minimum charge current. Details of soft start will be shown later. 3.1.5 Charge current Ichg The charge current Ichg for IC oscillator capacitor CFS is the sum of the four parts including Ichg_min, IFB, ISS and ICS. To limit the maximum switching frequency, maximum value of Ichg is 5 times of Ichg_min. In summary, the maximum charge current during normal operation is 3Ichg_min while the maximum charge current during fault condition or softstart is around 4Ichg_min and 4.43*Ichg_min respectively. Figure 7 shows the maximum switching frequency versus minimum switching frequency during normal operation. Figure 7 Fmax versus Fmin during normal operation 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 0 5 10 15 20 25 30 35 40 45 50 55 60 65 RFMIN[kohm] 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 00.5 11.5 22.5 33.5 44.5 Feedback voltage Vfb [V] 0 50 100 150 200 250 300 350 400 450 0 25 50 75 100 125 150 175 200 FMIN [kHz] |
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