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Shindengen MCZ5211ST Application Note

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CAT. No. 1H0901-1E
MCZ5211ST Application Note
LLC Current Resonance
Bridge Converter Control IC
with Standby-compatible Self-Startup Pin
MCZ5211ST
Shindengen Electric Manufacturing Co., Ltd.
+
Application Note Version 1.0
SHINDENGEN
ELECTRIC MFG.CO.,LTD
- 1 -
Aug. 2022 Version 1.0
Vo1
+

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Summary of Contents for Shindengen MCZ5211ST

  • Page 1 CAT. No. 1H0901-1E MCZ5211ST Application Note Aug. 2022 Version 1.0 LLC Current Resonance Bridge Converter Control IC with Standby-compatible Self-Startup Pin MCZ5211ST Application Note Version 1.0 Shindengen Electric Manufacturing Co., Ltd. SHINDENGEN ELECTRIC MFG.CO.,LTD - 1 -...

  • Page 2: Usage Precautions

    Even for IC products that do not correspond to the specific uses described herein, contact Shindengen if you intend to use our products in equipment or systems designed to operate continuously or equipment or systems that require long product service life.
  • Page 3 3.6: Circuit constant settings when using burst mode 34-35 4 : IC Peripheral Pattern Layout Precautions 4.1: IC peripheral pattern layout precautions 36-37 5 : Circuit Examples 5.1: Typical circuit diagram 6 :External Dimension Diagrams 6.1: SOP18 (MCZ5211ST) SHINDENGEN ELECTRIC MFG.CO.,LTD - 3 -...
  • Page 4 Overview The MCZ5211ST is a frequency modulation type current resonance power supply control IC. It features a self-startup pin (drain kick function) with a high withstand voltage of 600 V for loss-free startup. It also includes a high-withstand-voltage gate driver enabling direct drive of high-side MOSFETs.

  • Page 5: Block Diagram

    UVLO chg/dischg Drain Kick Dropper 0.5V clamp ON/OFF Latch Soft start LLC STOP Timer prot AS mode Timer chg Vc1 dischg didt CSO>1.0V Control Logic OCP2 OCP1 dischg didt Figure 1 MCZ5211ST block diagram SHINDENGEN ELECTRIC MFG.CO.,LTD - 5 -...

  • Page 6: Pin Assignment Diagram

    Pin assignment diagram Figure 2 MCZ5211ST pin assignment diagram Pin function list Pin No. Symbol Function Startup circuit input pin Input pin for the startup circuit Pin not connected Low input protection, SS reset Vsen Protects against low input voltage, turns remote on/off, resets SS.

  • Page 7: Basic Operations

    Basic Operations Unless otherwise specified, MCZ5211ST threshold values are indicated by typical values in the characteristic specifications. For more information on the characteristic diagrams provided in this Application Note, refer to the characteristic diagrams in the characteristic specifications. Operating modes The MCZ5211ST has two control methods and three operating modes.

  • Page 8: Power Supply Section

    Power supply section The MCZ5211ST incorporates a startup circuit that does not require a startup resistance for ease of use with fewer components. Figure 3 shows a schematic of the self-startup PFC unit etc. R120 circuit. Vin pin The Vin pin charges capacitor C134 connected to the Vc2 pin from the high-voltage section when the power supply starts up;...
  • Page 9 Malfunctions may result due to noise input to the Vc1 and Vc2 pins if the C134 or C161 capacitors are beyond a certain distance from the MCZ5211ST Vc1 and Vc2 pins. In such cases, add an MLCC with capacitance of approximately 0.1 uF to 1.0 uF close to the Vc1 and Vc2 pins to prevent malfunctions.
  • Page 10 If a MOSFET with a large Qg is used, connect a sink diode as shown in Figures 5 (B) and (C). When using a sink diode, use a low capacitance Schottky diode. Do not use a snappy (hard) recovery diode. We recommend using a Shindengen D1NS4 (axial) or M1FM3 (surface mounted) diode. Figure 5 Gate drive circuit examples Table 4 Drive capability threshold values For more information on individual ratings, refer to the characteristic specifications.
  • Page 11 2.3.2 Oscillation control section (FB pin) The MCZ5211ST oscillation frequency is determined by the charge and discharge of the capacitor Ct connected to the FB pin. VGL and VGH output alternately while Ct discharges. While Ct is charging, a dead time (DT) will result in which both the VGL and VGH outputs are off (see Figure 6).
  • Page 12 The MCZ5211ST is a frequency and ON duty modulated IC. The oscillation frequency is controlled by the FB pin current (see Figure 8). Dead time is widely controlled when the frequency is at the maximum, such as for light loads, making it easy to ensure ZVS (zero voltage switching) over the entire frequency range.
  • Page 13 Condition Rating Input voltage monitoring threshold 1 Vsen1 ASTBY<Vas(stpoff) 3.00 Input voltage monitoring threshold 2 Vsen2 ASTBY<Vas(stpoff) 2.75 Input voltage monitoring threshold 3 Vsen3 ASTBY>Vas(stpoff) 0.85 Input voltage monitoring threshold 4 Vsen4 ASTBY>Vas(stpoff) 0.75 SHINDENGEN ELECTRIC MFG.CO.,LTD - 13 -...
  • Page 14 2.3.4 Overcurrent protection function (CS/CSO pins) The MCZ5211ST includes an overcurrent protection function, and this uses the CS pin for detection. Figure 10 shows a CS and CSO pin connection example. MCZ5211ST SGND C123 R143 R164 C152 C141 R144 R141...
  • Page 15 The MCZ5211ST performs the following control operations when OCP1 detection is triggered: (a) The FB pin is switched to the charging period, and the gate output (VGH or VGL) is turned off. (b) The SST pin is charged at 40 uA for eight FB charge/discharge cycles.
  • Page 16 As shown in Figure 14, di/dt activates when the CS pin detects a negative edge below ±0.060 V. The MCZ5211ST performs the following control operations when di/dt activates: (a) The FB pin is switched to the charging period, and the gate output (VGH or VGL) is turned off.
  • Page 17 CSO pin pre-charge voltage Vcso(pre) CS=0V -100 OCP2 operation start CSO pin voltage Vcso(ocp2) Timer charge switching CSO pin detection Vcso(tmr) voltage CSO pin charging current during OCP2 Icso(ocp2) CSO>Vcso(ocp2) operation CSO pin discharging current Icso(dis) CSO=1.2V SHINDENGEN ELECTRIC MFG.CO.,LTD - 17 -...
  • Page 18 2.3.5 OCP2 input voltage correction (CS/SSD pins) The MCZ5211ST features a built-in circuit to correct the overcurrent protection operating point when the input voltage fluctuates. Input voltage corrections are performed by varying the OCP2 detection threshold value. The OCP2 detection threshold value varies based on the SSD pin voltage and FB pin voltage.
  • Page 19 For more information on individual ratings, refer to the characteristic specifications. Item Symbol Condition Rating SSD pin charging current 1 Issd(chg)1 ASTBY<Vastby(bston/off) -100 SSD pin charging current 2 Issd(chg)2 ASTBY>Vastby(bston/off) SSD pin open voltage Vssd(open) OCP2(+) detection voltage 2 Vocp2(+)2 SSD=1V 0.26 SHINDENGEN ELECTRIC MFG.CO.,LTD - 19 -...
  • Page 20 MOSFET turns on due to the trr component of the body diode, and a load is applied to the MOSFET. The MCZ5211ST includes a Tss(3) function to prevent the gate from turning off while the body diode is conducting at startup. As shown in Figure 21, the Tss(3) sequence extends the low-side VGL output by approximately 1.7-fold for the second time after the power supply starts.
  • Page 21 (3) Timer intermittent latch stop function during overcurrent protection function operation The MCZ5211ST includes a function to stop latching after the intermittent timer activates during OCP1, OCP2 and di/dt operation. For more information on the timing and conditions for timer charging, refer to Table 9.
  • Page 22 (4) Latch stop function The MCZ5211ST incorporates a latch stop function to stop latching under abnormal conditions such as overvoltage on the secondary side. Figure 23 shows an example of the secondary side OVP circuit configuration. The latch stop function is enabled by lifting the SST pin to 4.5 V from outside. Oscillation stops when the latch stop function is enabled.
  • Page 23 600 V and high speed and soft recovery characteristics. We recommend the Shindengen D1NK60 or D1FK60 (for a PFC output voltage of approximately 400 V). Figure 24 Bootstrap high-side Vcc generating circuit Table 14 VB pin threshold values For more information on individual ratings, refer to the characteristic specifications.
  • Page 24 If the ASTBY pin voltage is less than 2.2 V while in active standby mode, active standby mode is canceled, and the mode switches to normal mode. Figure 26 Gate waveform for AS linear operation SHINDENGEN ELECTRIC MFG.CO.,LTD - 24 -...
  • Page 25 The MCZ5211ST incorporates a function to control the FB pin discharging current according to the ASTBY voltage and Vsen voltage to suppress overshooting (or undershooting) when switching between normal and active standby modes. Figure 27 is a schematic diagram showing the correlation between the Vsen pin voltage and FB discharging current.
  • Page 26 1.5V Burst pin 2.0V voltage Burst discharging current SSD pin 6.0V voltage Output voltage Output voltage low er limit de tection VGH(L) Figure 30 Burst switching configuration Figure 31 Burst operating sequence example SHINDENGEN ELECTRIC MFG.CO.,LTD - 26 -...
  • Page 27 Burst pin output startup voltage Vbst(L) Burst pin discharging current 1 Ibst(dis)1 ASTBY<Vastby(bston/off) Burst pin discharging current 2 (Burst mode) Ibst(dis)2 ASTBY>Vastby(bston/off) FB discharging current 1 Ifb(dis)1 Vsen=6V、ASTBY=6V FB discharging current 2 Ifb(dis)2 Vsen=6V、ASTBY=2V SHINDENGEN ELECTRIC MFG.CO.,LTD - 27 -...
  • Page 28 2.3.10 Vc1 overvoltage protection function (Vc1 OVP function) The MCZ5211ST includes a latch stop function when the Vc1 pin overvoltage is applied. If the Vc1 pin voltage exceeds the Vc1(ovp latch) voltage of 33.0 V, latching stops. To cancel the latch stop, the Vc2 pin voltage must be set to the Vc2(latch reset) voltage of 7.0 V or less.
  • Page 29 Vc1＆Vc2 UVLO VsenseH VsenseL × 　　 ･･･（2） AS OFF bulkreset Internal 3.00V/2.75V VsenseL Vref 5V AS ON Burst ON 0.85V/0.75V VsenseH VsenseL × 　　 ･･･（3） bulkreset VsenseL Figure 33 Vsen pin internal configuration SHINDENGEN ELECTRIC MFG.CO.,LTD - 29 -...
  • Page 30 Rt vs fss 1200 Ct=2200pF Ct=470pF Ct=1500pF 1000 Ct=680pF Ct=1000pF Ct=820pF Ct=820pF Ct=1000pF Ct=680pF Ct=1500pF Ct=470pF Ct=2200pF frequency [kHz] Rt [kohm] Figure 35 Dead time relationship Figure 36 fss relationship SHINDENGEN ELECTRIC MFG.CO.,LTD - 30 -...
  • Page 31 Rt vs frequency Maximum oscillation frequency Ct=820pF Minimum oscillation frequency Rt [kohm] Figure 37 Maximum and minimum oscillation frequency setting example SHINDENGEN ELECTRIC MFG.CO.,LTD - 31 -...
  • Page 32 Note that the oscillation stop period during intermittent operation is canceled when the SST voltage decreases to the Vtimer(reset) voltage of 0.40 V. The oscillation stop period Ttimer(Stop) for intermittent operation is therefore calculated as shown in Equation (10). × [sec] ・・・(10) timer 停止 × Stop SHINDENGEN ELECTRIC MFG.CO.,LTD - 32 -...
  • Page 33 C152 to 1,000 pF and R164 to 100 kΩ or just left open. In this case, check that the output voltage is not reduced due to OCP2 detection within the normal operating range, as the response speed is increased when OCP2 is detected. SHINDENGEN ELECTRIC MFG.CO.,LTD - 33 -...
  • Page 34 ASTBY charging current, burst mode may be canceled due to the ASTBY pin voltage dropping. If there is a possibility of the burst cycle becoming shorter, use the circuit configuration shown in Figure 41. SHINDENGEN ELECTRIC MFG.CO.,LTD - 34 -...
  • Page 35 ASTBY 3.3V R159 R223 R227 SGND 4.7k C163 Q221 IC202 R224 2SC4081 HA17431 0.47u Burst mode R222-1 Burst : open Normal : short PC102-1 PC123 Figure 41 Active standby circuit example (using two couplers) SHINDENGEN ELECTRIC MFG.CO.,LTD - 35 -...
  • Page 36 IC peripheral pattern layout precautions The pattern layout of the switching power supply board will affect the power supply characteristics. The MCZ5211ST switches high voltages and large currents, so great care is required when laying out the circuit pattern. To minimize issues such as noise due to pattern inductance components, it is important to design the main circuit to ensure patterns are as thick and short as possible.
  • Page 37 In particular, the oscillation frequency of the LLC unit is determined between the FB and ground pins. Take precautions over the ground connection when measuring with the probe to eliminate effects attributable to the probe connection. SHINDENGEN ELECTRIC MFG.CO.,LTD - 37 -...
  • Page 38 R136 C205 C206 C113 Vout-2 C123 R163 D161 R161 C133 D133 C134 D204 R121 C162 C161 R122 (NC) R216 R210 MCZ5211ST R164 ASTBY BURST (NC) Vsen R123 C211 R211 R201 PC101 R165 R151 R204 C210 R215 D163 R221 PC102 R143...

  • Page 39: External Dimension Diagrams

    External Dimension Diagrams (For official dimensions, refer to the delivery specifications.) 6.1 SOP18 (MCZ5211ST) Marking area Part A Detailed schematic diagram of part A (12:1) SHINDENGEN ELECTRIC MFG.CO.,LTD - 39 -...
  • Page 40 Notes: SHINDENGEN ELECTRIC MFG.CO.,LTD - 40 -...

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