Summary of Contents for Shindengen MCZ5203SE
- Page 1 Confidential MCZ5203SE APPLICATION NOTE MAR, 2012 Ver1.0 SHINDENGEN ELECTRIC MFG.CO.,LTD - 1 -...
- Page 2 ● No part of this manual may be reproduced or copied without the specific written consent of Shindengen Electric Mfg. Co., Ltd. We are happy to provide circuit design support for safe use of the IC. Please consult our sales representative .
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Page 3: Table Of Contents
3.4: OCP （Rocpdet/RocpL） 13-14 3.5: di/dt protection 3.6: Timer latch protection（CTimer） 3.7: High side floating Vcc (VB) 3.8: Gate driver 4 : Circuit diagram 4.1: Typical circuit example 5 : Dimensions 5.1: SOP22 (MCZ5203SE) SHINDENGEN ELECTRIC MFG.CO.,LTD - 3 -... -
Page 4: General Description
8. Independent high side / low side Gate driver UVLO with hysterisis 9. Adjustable soft starting function 10. Anti-di/dt startup function eliminates improper startup Non ZVS operation 11. Optimized brown out protection 1.2 Block diagram （SOP22） SHINDENGEN ELECTRIC MFG.CO.,LTD - 4 -... -
Page 5: Pin Assignment
No connection (NC) 17,18,19 Voltage source of High side gate driver supplied from Vc2 through bootstrap circuit Floating driver reference voltage ( = Source pin of high side MOSFET) High side gate driver output SHINDENGEN ELECTRIC MFG.CO.,LTD - 5 -... -
Page 6: Application Circuits
Confidential Applicable circuits Most simple SEPP(Single Ended Push-Pull) Input ripple current reduction (Half Bridge) High power (Full Bridge) SHINDENGEN ELECTRIC MFG.CO.,LTD - 6 -... -
Page 7: Symmetric Llc Converter Operating Description
:Equivalent Load resistance Fig.1 LLC configuration Fig.2 simplified dc/dc converter Operating waveform example Output ripple voltage(Vo) Q2 Vds (Vds2) Q2 Idrain (Id(2) Fig.3 Vds / Idrain / Vo ripple Fig.4 Zoom of turn off period SHINDENGEN ELECTRIC MFG.CO.,LTD - 7 -... -
Page 8: Control Characteristics
Obtained from fmin and Ct Rocpdet Sensing resistor Primary resonant current sensing OCP sensing Primary current sensing voltage divider RocpL divider Soft start timing Obtained from tss. capacitor Burst operation Obtained from ttimer Ctimer timing capacitor SHINDENGEN ELECTRIC MFG.CO.,LTD - 8 -... -
Page 9: Ic Operation
When Vbulk decreases under the condition of continuous Vc1 supplied, operating frequency decreases toward fmin. The frequency starts increasing to fss level soon after Vsense decreases to 1.4V. Gate drive stops when Vsense voltage decreases to 0.7V. Fig 6. Power ON / OFF timing diagram SHINDENGEN ELECTRIC MFG.CO.,LTD - 9 -... - Page 10 Please note this circuit is for investigation only. Do not switch on/off the Vbulk when using Rsen1 as 1) to protect MOSFETs from undesired heavy switching stress especially in mid-heavy load condition. Fig.7 additional components SHINDENGEN ELECTRIC MFG.CO.,LTD - 10 -...
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Page 11: Oscillator（Rt
[ohm] ---(1) init [Hz] ---(2) Fig.10 Ct / Rt internal block SHINDENGEN ELECTRIC MFG.CO.,LTD - 11 -... -
Page 12: Vsense Brown-Out Protection（Rvsensel
Correct value of tss, soft start time period, is obtained from formula(6) using actual value of Css. Characteristics of Css voltage vs operating frequency at Css = 4.7uF (tss = 200ms) is shown in Fig.13. init ---(5) [sec] ---(6) SHINDENGEN ELECTRIC MFG.CO.,LTD - 12 -... -
Page 13: Ocp （Rocpdet/Rocpl
Filter capacitor is connected between OCP and SGND to eliminate the influence of parasitic inductance of sensing resistor or parasitic inductance. The capacitance value of 1000pF to 10000pF is recommended. Fig.14. OCP Timing diagram SHINDENGEN ELECTRIC MFG.CO.,LTD - 13 -... -
Page 14: Di/Dt Protection
In negative current direction, threshold voltage is -60mV. During didt protection is operating , CTimer is not charged. Please note didt threshold is about 1/6 of OCP threshold. Fig.17. di/dt protection SHINDENGEN ELECTRIC MFG.CO.,LTD - 14 -... -
Page 15: Timer Latch Protection（Ctimer
: tb = 1 : (20+tss), In case of CTimer=4.7uF / Css=2.2uF, tTimer=70msec , tb=1.5sec. refresh PROT abnormal signal reset latch Latch counter 2.5V Gate out (1) (2) Fig.18. Timer delayed burst and latching timing chart SHINDENGEN ELECTRIC MFG.CO.,LTD - 15 -... -
Page 16: High Side Floating Vcc (Vb)
Vc2 10V. 600V soft recovery type UFRD (ultra fast recovery diode) is recommended like D1NK60 (Shindengen). VB = Vc2 – Vf (Dboot) VS terminal is the reference potential for VB, so if negative spike voltage due to turn off current of low side switch and pattern parasitic inductance is too large,VB will be over charged. -
Page 17: Circuit Diagram
C205 C116 Vsen (NC) Timer (NC) (NC) D206 R210 R107 C113 C114 C115 C126 C112 R131 C111 R203 R211 R108 R202 C231 R231 CN102 PC101 IC201 C117 R213 ON/OFF Q113 Fig.21. dual output LLC SHINDENGEN ELECTRIC MFG.CO.,LTD - 17 -... -
Page 18: Dimensions
Confidential 5 Dimensions 5.1 SOP22 (MCZ5203SE) Units : mm SHINDENGEN ELECTRIC MFG.CO.,LTD - 18 -...
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