Related Manuals for Infineon CoolSET ICE2QR 80 Series
Summary of Contents for Infineon CoolSET ICE2QR 80 Series
- Page 1 Design Guide, Version 1.1, 8 August 2011 I C E 2 Q R x x 6 5 / 8 0 x Q u a s i R e s o n a n c e C o o l S E T D e s i g n G u i d e AN-PS0053 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 Page Subjects (major changes since last revision) Add ICE2QR0665Z, ICE2QR1065Z, ICE2QR1765Z, ICE2QR4765Z, ICE2QR0665G, ICE2QR1765G and ICE2QR4765GZ Revise typo ICE2QRxx65/80x Quasi Resonance CoolSET Design Guide License to Infineon Technologies Asia Pacific Pte Ltd AN-PS0053 Winson Wong Winson.wong@infineon.com Eric Kok Eric.kok@infineon.com We Listen to Your Comments Any information within this document that you feel is wrong, unclear or missing at all? Your feedback will help us to continuously improve the quality of this document.
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Page 4: Table Of Contents
Quasi-resonant CoolSET design guide ICE2QRxx65/80x Table of Contents Introduction .......................5 CoolSET description..................5 Main features........................5 Pin layout..........................5 Pin functions ........................6 2.3.1 ZC (Zero Crossing) ......................6 2.3.2 FB (Feedback) .........................6 2.3.3 CS (Current Sensing) ......................6 2.3.4 Drain ..........................6 2.3.5 VCC (Power supply) ......................6 2.3.6 GND (Ground) .........................6 Overview of quasi-resonant flyback converter ..........6... -
Page 5: Introduction
This design guide describes how to design quasi-resonant flyback converters using ICE2QRxx65/80x, which is a new Quasi-resonant PWM CoolSET developed by Infineon Technologies Firstly, the basic description of CoolSET will be given including the main features and Pin’s layout. Then an overview of quasi-resonant flyback converter will be given, followed by the introduction of ICE2QRxx65/80x’s... -
Page 6: Pin Functions
Quasi-resonant CoolSET design guide ICE2QRxx65/80x Pin functions 2.3.1 ZC (Zero Crossing) Three functions are incorporated at the ZC pin. First, during MOSFET off time, the de-magnetization of the transformer is detected when the ZC voltage falls below V (100mv). Second, after the MOSFET is turned ZCCT off, an output overvoltage fault will be assumed if V is higher than V... - Page 7 Quasi-resonant CoolSET design guide ICE2QRxx65/80x Snubber 85 ~ 265 VAC Drain Startup Cell Power Management PWM controller Current Mode Control ovs1 Cycle-by-Cycle ® CoolMOS current limitation Zero Crossing Block Optocoupler Active Burst Mode Protections TL431 CoolSET ® Control Unit ovs2 Figure 2 Typical Application of ICE2QRxx65/80x The drain-source voltage of the power switch V will rise very fast after MOSFET is turned off.
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Page 8: Functional Description And Component Design
Quasi-resonant CoolSET design guide ICE2QRxx65/80x Figure 3 Key waveforms of a quasi-resonant flyback converter Functional description and component design VCC Pre-Charging and Typical VCC Voltage During Start-up In the CoolSET ICE2QRxx65/80xx, a startup cell is integrated to the CoolMOS. The startup cell provides a pre-charging of the VCC capacitor till VCC voltage reaches the VCC turned-on threshold V and the VCCon... -
Page 9: Vcc Capacitor
Quasi-resonant CoolSET design guide ICE2QRxx65/80x Figure 4 VCC voltage at start up When the VCC voltage exceeds the turned-on threshold V at time t , the startup cell is switched off, and VCCon the CoolSET begins to operate with a soft-start. Because the energy from the auxiliary winding is not enough to supply the CoolSET operation when output voltage is low, the VCC voltage drops (Phase II). -
Page 10: Normal Operation
Quasi-resonant CoolSET design guide ICE2QRxx65/80x Normal Operation The PWM section of the CoolSET can be divided into two main portions: PWM controller for normal operation and PWM controller for burst mode operation. The PWM controller for normal operation will be described in the following paragraphs, while the PWM controller for burst mode operation will be discussed in the next section. -
Page 11: Switch-Off Determination
Quasi-resonant CoolSET design guide ICE2QRxx65/80x clock T=48ms FBR1 FBZH FBZL Up/down counter Case 1 Case 2 Case 3 Figure 6 Up/down counter operation 4.3.1.2 Switch-on Determination In the system, turn-on of the power switch depends on the value of the up/down counter, the value of the zero-crossing counter and the voltage at the ZC pin V . -
Page 12: During Burst Mode Operation
Quasi-resonant CoolSET design guide ICE2QRxx65/80x The feedback voltage is lower than the threshold of V (1.25V). Accordingly, the peak voltage across the shunt resistor is 0.17V; The up/down counter has its maximal value of 7; The two above conditions have to been fulfilled for a certain blanking time duration t (30ms) Once all of these conditions are fulfilled, the active burst mode flip-flop is set and the CoolSET enters burst mode operation and the gate will be turned off until V... -
Page 13: Leaving Active Burst Mode
Quasi-resonant CoolSET design guide ICE2QRxx65/80x If the output load is still low, the feedback signal decreases as the PWM section is operating. When feedback signal reaches the low threshold V (3.0V), the internal bias is reset again and the PWM section is disabled until next time regultaion signal increases beyond the V threshold. - Page 14 Quasi-resonant CoolSET design guide ICE2QRxx65/80x Secondly, as shown in Figure 3, there are two delay times for detection of the zero crossing and turn on of the MOSFET. The delay time t is the delay from the drain-source voltage cross the bus voltage to the ZC Delay1 voltage follows below 100mV.
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Page 15: Protections
Quasi-resonant CoolSET design guide ICE2QRxx65/80x is lower than 0.7V. During the ring suppression time, CoolSET can not be turned on again. Therefore, the ring suppression time can also be thought as a minimum off time. Protections The ICE2QRxx65/80x CoolSET provides full protection functions. The following table summarizes these protection functions. -
Page 16: Input Power Curves For Quasi Coolset 650V/800V
Quasi-resonant CoolSET design guide ICE2QRxx65/80x Figure 9 Schematic of the 12W 5V evalulation board with ICE2QR4780Z Input Power Curves for Quasi Coolset 650V/800V ® The purpose of the input power curve is to simplify the selection of the CoolSET device. The curve is a function of ambient temperature to the input power of the system in which the input filter loss, bridge rectifier loss and the MOSFET power loss are considered. - Page 17 Quasi-resonant CoolSET design guide ICE2QRxx65/80x ICE2QR1765: Vin=85Vac~265Vac ICE2QR1765: Vin=230Vac±15% Figure 11 Input power curve for ICE2QR1765 ICE2QR4765: Vin=85Vac~265Vac ICE2QR4765: Vin=230Vac±15% Figure 12 Input power curve for ICE2QR4765 ICE2QR0665Z: Vin=85Vac~265Vac ICE2QR0665Z: Vin=230Vac±15% Figure 13 Input power curve for ICE2QR0665Z Design Guide 8 August 2011...
- Page 18 Quasi-resonant CoolSET design guide ICE2QRxx65/80x ICE2QR1065Z: Vin=85Vac~265Vac ICE2QR1065Z: Vin=230Vac±15% Figure 14 Input power curve for ICE2QR1065Z ICE2QR1765Z: Vin=85Vac~265Vac ICE2QR175Z: Vin=230Vac±15% Figure 15 Input power curve for ICE2QR1765Z ICE2QR4765Z: Vin=85Vac~265Vac ICE2QR4765Z: Vin=230Vac±15% Figure 16 Input power curve for ICE2QR4765Z Design Guide 8 August 2011...
- Page 19 Quasi-resonant CoolSET design guide ICE2QRxx65/80x ICE2QR0665G: Vin=85Vac~265Vac ICE2QR0665G: Vin=230Vac±15% Figure 17 Input power curve for ICE2QR0665G ICE2QR1765G: Vin=85Vac~265Vac ICE2QR1765G: Vin=230Vac±15% Figure 18 Input power curve for ICE2QR1765G ICE2QR4765G: Vin=85Vac~265Vac ICE2QR4765G: Vin=230Vac±15% Figure 19 Input power curve for ICE2QR4765G Design Guide 8 August 2011...
- Page 20 Quasi-resonant CoolSET design guide ICE2QRxx65/80x ICE2QR0680Z: Vin=85Vac~265Vac ICE2QR0680Z: Vin=230Vac±15% Figure 20 Input power curve for ICE2QR0680Z ICE2QR2280Z: Vin=85Vac~265Vac ICE2QR2280Z: Vin=230Vac±15% Figure 21 Input power curve for ICE2QR2280Z ICE2QR4780Z: Vin=85Vac~265Vac ICE2QR4780Z: Vin=230Vac±15% Figure 22 Input power curve for ICE2QR4780Z Design Guide 8 August 2011...
- Page 21 Quasi-resonant CoolSET design guide ICE2QRxx65/80x ICE2QR2280G: Vin=85Vac~265Vac ICE2QR2280G: Vin=230Vac±15% Figure 23 Input power curve for ICE2QR2280G The major assumption for the calculation is listed below. 1. Reflection voltage from secondary side to primary side is 115V for 650V CoolSET and 150V for 800V CoolSET.
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Page 22: Pcb Layout Recommendation
Quasi-resonant CoolSET design guide ICE2QRxx65/80x PCB Layout Recommendation In power supply system, PCB layout is a key point for a successful design. Following are some suggestions for this (refer to application circuit in Figure 9). Minimize the loop with pulse share current or voltage; examples are the loop formed by the bus voltage source, primary winding, main switch and current sensing resistor or the loop consisting of secondary winding, output diode and output capacitor, or the loop of VCC power supply. -
Page 23: Design Equations
Quasi-resonant CoolSET design guide ICE2QRxx65/80x Design Equations With reference to the typical application diagram in Figure 2, some useful design equations are tabulated as below (refer to symbols to datasheet): Transformer Calculation (Quasi Resonant flyback) Vin_min=85V , Vin_max=400V Input data Vdc_max=515V for 650V MOSFET, 550V for 800V MOSFET ... -
Page 24: 10 References
Quasi-resonant CoolSET design guide ICE2QRxx65/80x 10 References Design tips for flyback converters using the Quasi-Resonant PWM controller ICE2QS01, Infineon Technologies, 2006. [ANPS0005] Converter design using the quasi-resonant PWM controller ICE2QS01, application notes, Infineon Technologies, 2006. [ANPS0003] Determine the switching frequency of Quasi-Resonant flyback converters designed with ICE2QS01, Infineon Technologies, 2006.