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PDF ICE2QS03G Data sheet ( Hoja de datos )
| Número de pieza | ICE2QS03G | |
| Descripción | Quasi-Resonant PWM controller | |
| Fabricantes | Infineon | |
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Quasi-Resonant PWM controller
ICE2QS03G
Table of Contents
Revision History ...................................................................................................................................................4
Table of Contents .................................................................................................................................................5
1 Pin Configuration and Functionality ..............................................................................................7
1.1 Pin Configuration with PG-DSO-8......................................................................................................7
1.2 Pin Functionality.................................................................................................................................7
2 Representative Block Diagram .......................................................................................................8
3
3.1
3.2
3.3
3.3.1
3.3.1.1
3.3.1.2
3.3.2
3.3.2.1
3.3.3
3.3.4
3.4
3.4.1
3.5
3.5.1
3.5.2
3.5.3
3.6
Functional Description ....................................................................................................................9
VCC Pre-Charging and Typical VCC Voltage During Start-up...........................................................9
Soft-start ............................................................................................................................................9
Normal Operation.............................................................................................................................10
Digital Frequency Reduction.......................................................................................................10
Up/down counter....................................................................................................................10
Zero crossing (ZC counter) ....................................................................................................11
Ringing suppression time............................................................................................................12
Switch on determination ........................................................................................................12
Switch Off Determination ............................................................................................................12
Modulated gate drive ..................................................................................................................12
Current Limitation.............................................................................................................................13
Foldback Point Correction...........................................................................................................13
Active Burst Mode Operation ...........................................................................................................14
Entering Active Burst Mode Operation........................................................................................14
During Active Burst Mode Operation ..........................................................................................14
Leaving Active Burst Mode Operation ........................................................................................15
Protection Functions ........................................................................................................................16
4
4.1
4.2
4.3
4.3.1
4.3.2
4.3.3
4.3.4
4.3.5
4.3.6
4.3.7
4.3.8
4.3.9
4.3.10
Electrical Characteristics ..............................................................................................................17
Absolute Maximum Ratings .............................................................................................................17
Operating Range..............................................................................................................................17
Characteristics .................................................................................................................................18
Supply Section ............................................................................................................................18
Internal Voltage Reference .........................................................................................................18
PWM Section ..............................................................................................................................19
Current Sense.............................................................................................................................19
Soft Start.....................................................................................................................................19
Foldback Point Correction...........................................................................................................19
Digital Zero Crossing ..................................................................................................................20
Active Burst Mode.......................................................................................................................20
Protection....................................................................................................................................21
Gate Drive...................................................................................................................................21
5 Outline Dimension .........................................................................................................................22
6 Marking ...........................................................................................................................................23
Data Sheet
5 V2.3, 2014-03-06
5 Page 
Quasi-Resonant PWM controller
ICE2QS03G
Functional Description
In the ICE2QS03G, the number of zero crossing is limited to 7. Therefore, the counter varies between 1 and 7,
and any attempt beyond this range is ignored. When VFB exceeds VFBR1 voltage, the up/down counter is reset to
1, in order to allow the system to react rapidly to a sudden load increase. The up/down counter value is also
reset to 1 at the start-up time, to ensure an efficient maximum load start up. Figure 6 shows some examples on
how up/down counter is changed according to the feedback voltage over time.
The use of two different thresholds VFBZL and VFBZH to count upward or downward is to prevent frequency
jittering when the feedback voltage is close to the threshold point. However, for a stable operation, these two
thresholds must not be affected by the foldback current limitation (see section 3.4.1), which limits the VCS
voltage. Hence, to prevent such situation, the threshold voltages, VFBZL and VFBZH, are changed internally
depending on the line voltage levels.
Figure 6 Up/down counter operation
3.3.1.2 Zero crossing (ZC counter)
In the system, the voltage from the auxiliary winding is applied to the zero-crossing pin through a RC network,
which provides a time delay to the voltage from the auxiliary winding. Internally this pin is connected to a
clamping network, a zero-crossing detector, an output overvoltage detector and a ringing suppression time
controller.
During on-state of the power switch a negative voltage applies to the ZC pin. Through the internal clamping
network, the voltage at the pin is clamped to certain level.
The ZC counter has a minimum value of 0 and maximum value of 7. After the internal MOSFET is turned off,
every time when the falling voltage ramp of on ZC pin crosses the VZCCT (100mV) threshold, a zero crossing is
detected and ZC counter will increase by 1. It is reset every time after the DRIVER output is changed to high.
The voltage VZC is also used for the output overvoltage protection. Once the voltage at this pin is higher than the
threshold VZCOVP during off-time of the main switch, the IC is latched off after a fixed blanking time.
To achieve the switch-on at voltage valley, the voltage from the auxiliary winding is fed to a time delay network
(the RC network consists of Dzc, Rzc1, Rzc2 and Czc as shown in Figure 1) before it is applied to the zero-crossing
detector through the ZC pin. The needed time delay to the main oscillation signal Δt should be approximately
one fourth of the oscillation period, Tosc (by transformer primary inductor and drain-source capacitor) minus the
propagation delay from the detected zero-crossing to the switch-on of the main switch tdelay.
Data Sheet
11 V2.3, 2014-03-06
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ICE2QS03G.PDF ] | |
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