Infineon ICE2QS03G Application Note
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Infineon ICE2QS03G Application Note

Converter design using quasi-resonant pwm controller
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Application note, Version 1.0, 7 April 2010
A p p l i c a t i o n n o t e
A N P S 0 0 4 5 - I C E 2 Q S 0 3 G
C o n v e r t e r D e s i g n U s i n g Q u a s i - r e s o n a n t P W M
C o n t r o l l e r I C E 2 Q S 0 3 G
P o w e r M a n a g e m e n t & S u p p l y
N e v e r
s t o p
t h i n k i n g .

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Summary of Contents for Infineon ICE2QS03G

  • Page 1 Application note, Version 1.0, 7 April 2010 A p p l i c a t i o n n o t e A N P S 0 0 4 5 - I C E 2 Q S 0 3 G C o n v e r t e r D e s i g n U s i n g Q u a s i - r e s o n a n t P W M C o n t r o l l e r I C E 2 Q S 0 3 G P o w e r M a n a g e m e n t &...
  • Page 2 Infineon Technologies components may be used in life-support devices or systems only with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system or to affect the safety or effectiveness of that device or system.
  • Page 3 Revision History: 7 April 2010 V1.0 Previous Version: none Page Subjects (major changes since last revision) Converter design using the quasi-resonant PWM controller ICE2QS03G License to Infineon Technologies Asia Pacific Pte Ltd AN-PS0045 Wang Zan zan.wang@infineon.com He Yi Yi.he@infineon.com Jeoh Meng Kiat Mengkiat.jeoh@infineon.com...

  • Page 4: Table Of Contents

    Converter design using the quasi-resonant PWM controller ICE2QS03G AN-PS0045 Table of Contents Introduction ......................5 IC description ......................5 Main features ........................5 Pin layout ..........................5 Pin functions........................5 2.3.1 ZC (Zero Crossing)......................6 2.3.2 FB (Feedback).......................6 2.3.3 CS (Current Sensing) ....................6 2.3.4 Gate (Gate drive output)....................6 2.3.5...

  • Page 5: Introduction

    In this application note, The basic description of IC will be given first including the main features and Pin’s layout. Then an overview of quasi-resonant flyback converter will be given, followed by the introduction of ICE2QS03G’s functions and operations. Some application examples and hints will be given in the last part of this document.

  • Page 6: Zc (Zero Crossing)

    This is the common ground of the controller Overview of quasi-resonant flyback converter Figure shows a typical application of ICE2QS03G in quasi-resonant flyback converter. In this converter, the mains input voltage is rectified by the diode bridge and then smoothed by the capacitor C...
  • Page 7 TL431 ICE2QS03G ovs2 Figure 2 Typical Application of ICE2QS03G The drain-source voltage of the power switch v will rise very fast after MOSFET is turned off. This is caused by the energy stored in the leakage inductance of the transformer. A snubber circuit, RCD in most cases, can be used to limit the maximum drain source voltage caused.

  • Page 8: Functions And Application Overview

    4.1 VCC Pre-Charging and Typical VCC Voltage During Start-up In the controller ICE2QS03G, a power cell is integrated and it consists of a 500V high voltage device and a controller, whereby the high voltage device is controlled by the controller. The power cell provides a pre-...

  • Page 9: Soft-Start

    According to this information, the value in the up/down counter is changed to a low value in case of high regulation voltage, and to a high value in case of low regulation voltage. In ICE2QS03G, the lowest value of the counter is 1 and the highest 7. Following text explains how the up/down counter value changes in response to the regulation voltage v .

  • Page 10: Switch-Off Determination

    Converter design using the quasi-resonant PWM controller ICE2QS03G AN-PS0045 thresholds V and V . According to the results, the value in the up/down counter is changed, which is summarised in Table 1 and Figure 6 respectively. According to the comparison results the up/down counter counts upwards, keeps unchanged or counts downwards.

  • Page 11: Active Burst Mode Operation

    Converter design using the quasi-resonant PWM controller ICE2QS03G AN-PS0045 ⋅ To avoid mistriggering caused by the voltage spike across the shunt resistor after switch-on of the main power switch, a 330ns leading edge blanking time (t ) is applied to the output of the comparator.

  • Page 12: Leaving Active Burst Mode

    Converter design using the quasi-resonant PWM controller ICE2QS03G AN-PS0045 4.4.3 Leaving Active Burst Mode The regulation voltage immediately increases if there is a high load jump. This is observed by one comparator. As the current limit is 25% during active burst mode a certain load is needed so that regulation voltage can exceed VLB (4.5V).

  • Page 13: Gate Drive

    Converter design using the quasi-resonant PWM controller ICE2QS03G AN-PS0045 voltage increases. This is done through sensing the current flowing out from ZC pin when MOSFET is turned When the main power switch is turned on, the negative voltage on auxiliary winding can be calculated as −...

  • Page 14: Typical Application Circuit

    To prevent it, in ICE2QS03G, a maximum on time and maximum switching period is provided. The maximum on time in ICE2QS03G is 30 µs typically. If the gate is maintained on for 30 µs, IC will turn off the gate regardless of the current sense voltage.

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