Summary of Contents for Shindengen MCZ5207SG
- Page 1 MCZ5207SG CAT.No. 1H0100-1E MCZ5207SG APPLICATION NOTE Jan.2013 Ver1.0 Current resonant bridge controller MCZ5207SG SHINDENGEN ELECTRIC MFG.CO.,LTD - 1 -...
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Page 2: Application Note
● 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 . - Page 3 3.2: Oscillator / Feedback (FB) Soft start / delayed protection timer (SST) 3.3: 3.4: OCP1/OCP2 and anti-capacitive mode protection 20-21 4 : Circuit diagram Configuration example 4.1: DCDC 5 : Dimensions 5.1: SOP16 (MCZ5207SG) SHINDENGEN ELECTRIC MFG.CO.,LTD - 3 -...
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Page 4: General Description
MCZ5207SG General description MCZ5207SG is an advanced symmetric LLC current resonant mode controller for bridge converter. Built-in high voltage direct gate drivers, control circuit and optimized protections allow simplified and space/cost-saving design of power supplies for : Large screen flat panel TVs (PDP / LCD ) ... - Page 5 Vsen Reset SST Latch ON/OFF AS Mode AS Lin Control Level Shift Logic Fixed DT Timer Latch Counter 8 times discharge charge OCP1 OCP2 didt1 Fig 1 . MCZ5207SG internal block diagram SHINDENGEN ELECTRIC MFG.CO.,LTD - 5 -...
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Page 6: Pin Assignment
5.FB 12.NC 6.CSO 11.VGL 7.CS1 10.Vc2 8.CS2 9.GND Fig 2 . MCZ5207SG pin assignment 1.4 Functions symbol description Pin number IC supply voltage VCC input up to 35V UVLO(on) = 12.9V / UVLO(off) = 8.7V. Bus Voltage sensing input Vsen... - Page 7 MCZ5207SG 1.5 Applicable circuit configuration Most simple SEPP(Single Ended Push-Pull) Input ripple current reduction (Half Bridge) For high power application (Full Bridge) SHINDENGEN ELECTRIC MFG.CO.,LTD - 7 -...
- Page 8 MCZ5207SG Functional description Operation mode MCZ5207SG operation timing chart is shown in 2.2 and 2.3. Method of selecting components value is described in article 3. MCZ5207SG has three operation mode : 1) Normal operation mode 2) Active stdby mode 3) Burst operation mode Normal operation is assumed in this document unless otherwise specified.
- Page 9 MCZ5207SG 2.3 Functional terminal detail 2.3.1 Gate drive output (VGL and VGH) Gate driver output terminals are VGL (Low side MOSFET) and VGH (High side MOSFET) with 0.18Apk sourcing and 0.4Apk sinking capability. Generic gate drive connection is shown in Fig.3(A).
- Page 10 MCZ5207SG Operating frequency is varied by controlling Ct discharging current. (Fig.5) Dead time expands according to operating frequency increase, thus ZVS (Zero Voltage Switching) operation can be easily achieved in wide input/output range and various resonant condition. Minimum operating frequency (fmin) is determined by timing capacitor Ct and timing resistor Rt.
- Page 11 Fig. 7 OCP1 operation timing 2.3.5 Frequency clamped averaging OLP (CS2 and CSO) The MCZ5207SG has frequency clamped Over Load Protection (OCP2, hereinafter). When CS2 terminal voltage reaches to +/-0.5V, CSO starts to be charged and operating frequency increases according to CSO terminal voltage increases. Operating frequency and CSO terminal voltage is shown in Fig.
- Page 12 -0.06V Fig. 10 . Anti-capacitive mode protection timing 2.3.7 Safe-startup protection (Tss(3)) The MCZ5207SG has another di/dt protection at startup period to prevent too fast turn-off before body diode conduction period ends. On 2 VGL output period, VFB (bottom) threshold voltage is switched to lower value and results in increase of ON time period .
- Page 13 MCZ5207SG FB(Top) FB(Bottom) Vth (Tss3) bootstrap charging current Fig. 11 Tss(3) operation timing chart 2.3.8 Soft start (SST) During starting period , operating frequency decreases from soft start frequency (fss) to stabilized frequency proportionally to SST terminal voltage to prevent excessive resonant current or output inrush current and capacitive mode operation.
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Page 14: Protection Status
MCZ5207SG To initialize latching status, restart Vc1 to Vc1<8.3V. Protection timing chart is shown in Fig.13. Csst charging current is depend on CSO terminal voltage during continuous OCP2 operation. Table 1. Csst charging current Protection status Csst charging current OCP1 40uA 1.0V <... - Page 15 MCZ5207SG Cboot 0.1 uF Dboot D1NK60 D1FK60 PGND MCZ5207SG Fig. 14 Boot Strapping circuit SHINDENGEN ELECTRIC MFG.CO.,LTD - 15 -...
- Page 16 MCZ5207SG 2.3.11 Active stdby asymmetric operation (AS) The MCZ5207SG has asymmetric operation mode called Active Standby Mode to improve light load efficiency. When AS terminal voltage less than Vas(on) 0.8V, operation enters into asymmetric operation mode. After entering in AS mode, operation will return to normal symmetric operation mode when AS terminal voltage reaches to more than Vas(off) 1.0V.
- Page 17 Fig. 17 Burst mode operation timing Fig. 18 BURST w/external signal configuration example 2.4 Thermal shut down protection (TSD) The MCZ5207SG implements Thermal Shut Down protection. Threshold temperature is TSD 140C min. with 40C hysteresis. During TSD mode, IC operation entirely stops. SHINDENGEN ELECTRIC MFG.CO.,LTD...
- Page 18 MCZ5207SG Selecting components value 3.1 Input Brown out protection (Vsen) Vsen SS reset threshold voltage is 3.55V/3.25V. (AS mode OFF) 1.0V/0.9V. (AS mode ON) Vsen terminal sink current is less than 0.2uA,so 20uA or more sensing bias current is recommended not to be affected by the sink current.
- Page 19 MCZ5207SG (FB) Oscillator / Feedback Operating frequency can be controlled by pulling current from FB terminal. Ct , Rt and Rfb connected to FB terminal determine minimum frequency (fmin),maximum frequency (fmax) , starting frequency (fss) and dead time (DT). 3.2.1 dead time and soft start frequency (Ct ) Dead time and soft start frequency fss are determined by Ct capacitance.
- Page 20 MCZ5207SG 3.3 Soft start / Timer delayed protection (SST) Soft start charging current Iss(charge) is 30uA. When SST voltage rises to 0.6V, gate output starts and timer charging is enabled when SST voltage rises to 1.5V. Soft starting time tss is a time period in which SST voltage rises from 0.6V to 1.5V.
- Page 21 MCZ5207SG (a) CS1/2 independent sensing (b) CS1/2 common sensing Fig. 20 CS1 and CS2 current sensing circuit ・・・ init det( ocpH ・・・ ocpL ocpH ocpL ・・・ ocpL output V/I characteristics I out Fig.
- Page 22 MCZ5207SG Circuit diagram 4.1 Configuration example of DC to DC dual output LLC SHINDENGEN ELECTRIC MFG.CO.,LTD - 22 -...
- Page 23 MCZ5207SG Dimension 5.1 SOP16 (MCZ5207SG) SHINDENGEN ELECTRIC MFG.CO.,LTD - 23 -...
- Page 24 MCZ5207SG Notes: SHINDENGEN ELECTRIC MFG.CO.,LTD - 24 -...
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