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ICE2QS03 Datasheet(PDF) 10 Page - Infineon Technologies AG

Part # ICE2QS03
Description  Quasi-Resonant PWM Controller
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

ICE2QS03 Datasheet(HTML) 10 Page - Infineon Technologies AG

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Quasi-Resonant PWM Controller
ICE2QS03
Functional Description
Version 2.1
10
April 21, 2011
required maximum VCS versus various input bus
voltage can be calculated, which is shown in Figure 6.
0.6
0.7
0.8
0.9
1
80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400
Vin(V)
Figure 6 Variation of the VCS limit voltage according
to the IZC current
According to the typical application circuit, when
MOSFET is turned on, a negative voltage proportional
to bus voltage will be coupled to auxiliary winding.
Inside ICE2QS03, an internal circuit will clamp the
voltage on ZC pin to nearly 0V. As a result, the current
flowing out from ZC pin can be calculated as
[5]
When this current is higher than IZC_1, the amount of
current exceeding this threshold is used to generate an
offset to decrease the maximum limit on VCS. Since the
ideal curve shown in Figure 6 is a nonlinear one, a
digital block in ICE2QS03 is implemented to get a
better control of maximum output power. Additional
advantage to use digital circuit is the production
tolerance is smaller compared to analog solutions. The
typical maximum limit on VCS versus the ZC current is
shown in Figure 7.
0.6
0.7
0.8
0.9
1
300
500
700
900
1100
1300
1500
1700
1900
2100
Iz c(uA)
Figure 7VCS-max versus IZC
3.5
Active Burst Mode Operation
At light load condition, the IC enters Active Burst Mode
operation to minimize the power consumption. Details
about Active Burst Mode operation are explained in the
following paragraphs.
3.5.1
Entering Active Burst Mode Operation
For determination of entering
Active Burst Mode
operation, three conditions apply:
• the feedback voltage is lower than the threshold of
VFBEB(1.25V). Accordingly, the peak current sense
voltage across the shunt resistor is 0.17;
• the up/down counter is 7; and
• a certain blanking time (tBEB).
Once all of these conditions are fulfilled, the Active
Burst Mode flip-flop is set and the controller enters
Active Burst Mode operation. This multi-condition
determination for entering Active Burst Mode operation
prevents mistriggering of entering Active Burst Mode
operation, so that the controller enters Active Burst
Mode operation only when the output power is really
low during the preset blanking time.
3.5.2
During Active Burst Mode Operation
After entering the Active Burst Mode the feedback
voltage rises as VOUT starts to decrease due to the
inactive PWM section. One comparator observes the
feedback signal if the voltage level VBH (3.6V) is
exceeded. In that case the internal circuit is again
activated by the internal bias to start with swtiching.
Turn-on of the power MOSFET is triggered by the
timer. The PWM generator for Active Burst Mode
operation composes of a timer with a fixed frequency of
52kHz, typically, and an analog comparator. Turn-off is
resulted by comparison of the voltage signal v1 with an
internal threshold, by which the voltage across the
shunt resistor VcsB is 0.34V, accordingly. A turn-off can
also be triggered by the maximal duty ratio controller
which sets the maximal duty ratio to 50%. In operation,
the output flip-flop will be reset by one of these signals
which come first.
If the output load is still low, the feedback signal
decreases as the PWM section is operating. When
feedback signal reaches the low threshold VBL(3.0V),
the internal bias is reset again and the PWM section is
disabled until next time regultaion siganl increases
beyond the VBH threshold. If working in Active Burst
Mode the feedback signal is changing like a saw tooth
between 3.0V and 3.6V shown in Figure 7.
3.5.3
Leaving Active Burst Mode Operation
The feedback voltage immediately increases if there is
a high load jump. This is observed by one comparator.
As the current limit is 34% during Active Burst Mode a
certain load is needed so that feedback voltage can
exceed VLB (4.5V). After leaving active busrt mode,
maximum current can now be provided to stabilize VO.
In addition, the up/down counter will be set to 1



-------------------------
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