ADP1046 Daughter Board compatible with existing one for ADP1043

Question Is ADP1046 Daughter Board compatible with existing one for ADP1043? Answer Please find attached to this email, a document highlighting the list of changes between ADP1043 and ADP1046. The ADP1046 daughter card is pin to pin compatible with the ADP1043 daughter card. The only thing I would modify is the ACSNS circuit on the main board. Check the attached document for the differences. One more thing to note, is the ADP1043 settings cannot be directly loaded into the ADP1046. You can run the two GUIs simultaneously side-by-side and replicate the settings.

PWM Setup ZVS app note

Overview: The ADP1046A offers flexibility when designing the PWM timing for many topologies. This app note focuses on the Phase Shifted Full Bridge topology, where Zero Voltage Switching is required. It walks through the theory, and the design process using ADP1046A, highlighting important considerations along the way. Background: Power Supply designers focus heavily on efficiency of the systems they develop. One technique which is popular is to use Zero-Voltage-Switching (ZVS). ZVS is used in many power supply converter topologies. It uses the transformer leakage inductance to discharge the MOSFET output capacitance to zero volts before turning them on. This can significantly reduce turn-on switching losses, and hence improve the efficiency of the converter. This is especially true in high input voltage PSUs, such as server PSUs, where the MOSFETs typically operate with 400V or higher. ZVS explained: A Full Bridge topology consists of 4 switches, 2 sets of 2 series switches. The series switches are never both on at the same time, as the input would then be shorted directly to ground, resulting in shoot-through. But it is also not optimal to leave them both off for too long, as there will be body diode conduction, and therefore, losses. The best performance comes by only having them off for just as long as needed to avoid shoot-through. This time, when both series switches are off, is called the dead-time. To explain ZVS, it is valuable to look at the MOSFET switch in terms of 3 components, that is a switch, body diode and output capacitance. Figure 1 shows a full bridge topology from this viewpoint. Figure 1. Full Bridge Topology. When QA and QD switches are both on, the source of QA is 400V (VIN+) and the drain of QD is connected to 0V (VIN-). QD’s output capacitor (CapD) is discharged. Since QC is off, QC’s output capacitor (CapC) is charged to 400V. When QD is turned off, the primary current continues to flow, thanks to the leakage inductance of the main transformer. This causes the output capacitance of QD to be charged up from 0V to 400V. At the same time, CapC is being discharged from a potential of 400V to 0V. The source of QA remains at 400V (VIN+) and the drain of QD moves to this voltage also. The speed at which it reaches 400V depends on the amount of energy stored in the main transformer when QD is turned off, the leakage inductance of the main transformer, and the output capacitance of the QD switch. The drain of QC is always connected to 400V. And it’s source is connected to the drain of QD. Therefore, when the drain of QD reaches 400V, then there is 0V differential between QC’s source and drain. Turning on QC at this point means that there will be no energy loss in discharging it’s cap, CapC. This is Zero-Voltage Switching (ZVS), and is the way to minimize the switching losses in the power supply. The ADP1046A can be used to realize ZVS operation, and therefore, optimal efficiency performance from a switching loss perspective. Figure 2: OUTD achieving ZVS. The VDS voltage has been reduced to 0V before the VGS has been turned on. ZVS using ADP1046A; Basic setup: A Phase Shift Full Bridge ZVS topology which incorporates synchronous rectification requires 6 PWM signals to control the 6 MOSFETs. 4 PWMs (OUTA, OUTB, OUTC, OUTD) are used for the primary side switches. 2 PWMs (SR1, SR2) are used to control the synchronous rectifiers on the secondary side of the isolation barrier. See Figure 1 for a typical Full Bridge Phase Shift topology schematic. The first thing required is to decide which PWM outputs of the ADP1046A are going to control which of the switches. Figure 2 shows the recommended setup. The reason for this is explained below. Figure 3. ADP1046A Recommened initial PWM settings. OUTA and OUTB should be chosen as complementary inputs. These are the non-modulating PWM signals. These are the lagging leg of the Full Bridge. OUTC and OUTD should be chosen as complementary inputs. These are the phase shifted PWM signals. These are the leading leg of the Full Bridge. OUTA and OUTD should be chosen as diagonal pair. OUTB and OUTC should be chosen as a diagonal pair. Figure 4. Recommended MOSFET naming. The ADP1046A allows dead-time to be set on each PWM output. This allows the designer great flexibility. As explained in the theory section, the ZVS timing is a function of the MOSFET and transformer components. This means that the dead-time required for ZVS operation will vary from design to design. The ADP1046A programmability allows this to be optimized for each design. It is recommended to begin ZVS evaluation with a lot of extra dead-time between falling and rising edges. This is to prevent shoot-through, and damage of the MOSFET components. For example, 250nsecs should be sufficient as a starting point. ZVS operation cannot be achieved over the full load range, so the user needs to decide a load current above which ZVS operation will be required. Turn on the Power Supply, and monitor the primary side transformer voltage waveform. This is shown in yellow in Figure 5. Figure 5. Transformer primary side winding voltage waveform. The falling edge marked by * is the primary side voltage when OUTA and OUTD are both turned on. The falling edge marked by ** is the primary side voltage when OUTB and OUTC are both turned on. Zoom in on *. The following scope shots show the slew rate of the * edge for different load currents. The larger the load current, the faster the slew rate. This is because the inductor has more energy to discharge the voltage which is present on the MOSFET output capacitance. Figure 6. Light Load Current Slew Rate. The MOSFET capacitance discharge time is approx 135nsecs. Figure 7. High Load Current Slew Rate. The MOSFET capacitance discharge time is approx 70nsecs. From the results measured above, the deadtime between complementary PWMs should be set to 70nsecs minimum. Anything longer than this will introduce body diode conduction losses. So, for OUTA and OUTB, the deadtime is set to 120nsecs. This includes guardbanding. For OUTC and OUTD, an extra 80nsecs needs to be added to this because of the extra amount that the VSBalance if it is needed. Therefore, 200nsecs is set as the deadtime for these edges. Figure 8. Simulation results showing ZVS of leading leg and falling leg of full bridge. Synchronous Rectifiers In the ADP1046A, SR1 and SR2 control the synchronous rectifier circuit, the recommended setup of SR1 and SR2 are: SR1 rising edge: This is set to align with OUTC falling edge with a dead time. SR1 falling edge: This is set to align with OUTB rising edge with a dead time. SR2 rising edge: This is set to align with OUTD falling edge with a dead time. SR2 falling edge: This is set to align with OUTA rising edge with a dead time. Figure 9. Recommended setup for synchronous rectifiers. SR1 rising edge is close to OUTC falling edge. SR2 rising edge is close to OUTD falling edge. This FAQ was generated from the following discussion: The specified item was not found.

Can the voltage VS- pin (VS3- for ADP1046A) of ADP1050/51/55 operate at a voltage higher than 0.3V?

In the data sheet of ADP1046A and ADP1050/51/55, the VS- pin (VS3- pin for ADP1046A) voltage should be within -0.3V ~ +0.3V referred to AGND pin. However, since the VS- is the negative remote voltage sense input, the load voltage sense point (remote voltage) might be far away from the local ground AGND. Therefore the VS- voltage may be higher than +0.3V. Can it work? According to the diagram shown in the attachment, the VS+ and VS- pins are differential inputs of a differential amplifier. The voltage of both input pins can operate at a voltage higer than 0.3V. So it is safe that the VS- operates at a voltage higher than 0.3V. However, the user need to consider twol points: 1. All the digital power products are charactered at a VS- voltage of +-200mV. The specifications in the datasheet are not graranteed if the VS- voltage higher than 0.3V. 2. The long copper and high voltage drop between the PSU output and load might introduce common mode noise. A filter circuitry is recommended (See the layout guidelines setion in the data sheet) Attachments:

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+MAX20090BATP/V+: FAQ
+MAX20092ATJ/VY+: FAQ
+MAX20098ATE/V+: FAQ
+MAX20098ATEA/V+: FAQ
+MAX20098ATEA/VY+: FAQ
+MAX20098ATED/VY+: FAQ
+MAX20098ATEF/VY+: FAQ
+MAX20323AENC+: FAQ
+MAX20323AENC+: FAQ
+MAX20323CENC+T: FAQ
+MAX20323DENC+T: FAQ
MAX20323DENC+T: FAQ
+MAX20328AEWA+: FAQ
MAX20330AEVKIT#: FAQ
+MAX20330AEWA+: FAQ
+MAX20331AEWL+: FAQ
+MAX20331AEWL+: FAQ
+MAX20343BEWE+: FAQ
MAX20361AEWC+: FAQ
+MAX20361AEWC+_B1: FAQ
+MAX20410AFOA/VY+: FAQ
+MAX20419ATGA/V+: FAQ
+MAX20480ATEA/VY+: FAQ
+MAX20710EPL+T: FAQ
+MAX20730EPL+: FAQ
+MAX20733: FAQ
+MAX20734EPL+: FAQ
+MAX20735: FAQ
+MAX20743EPL+: FAQ
MAX20751: FAQ
MAX20751EKX+: FAQ
+MAX20751EKX+T: FAQ
+MAX20754ETMA1+: FAQ
+MAX20801AEVKIT#: FAQ
+MAX20801TPBA+: FAQ
+MAX20801TPBD+: FAQ
+MAX20812: FAQ
+MAX22201: FAQ
+MAX22256: FAQ
+MAX25203: FAQ
+MAX25206ATPA/VY+: FAQ
+MAX25210ASA8/V+: FAQ
+MAX25221BATJ/V+: FAQ
+MAX25240: FAQ
+MAX25254: FAQ
+MAX25262: FAQ
MAX253ESA+: FAQ
+MAX253ESA+: FAQ
+MAX25601AATJ/VY+: FAQ
+MAX25610AATE/VY+T: FAQ
+MAX25611AATC/VY+: FAQ
+MAX25611DATC/VY+: FAQ
MAX256ASA+: FAQ
+MAX31740ATA+: FAQ
+MAX31760AEE+: FAQ
+MAX31760AEE+T: FAQ
MAX31785: FAQ
+MAX31785: FAQ
+MAX31785AETL+T: FAQ
+MAX31785AETL+T: FAQ
+MAX31790ATI+: FAQ
+MAX31790ATI+T: FAQ
MAX31790ATI+T: FAQ
+MAX34440ETLA1+: FAQ
+MAX34446ETL+T: FAQ
+MAX34451ETNA1+: FAQ
+MAX34451ETNA2+: FAQ
+MAX34451ETNA3+: FAQ
+MAX38640AELT+: FAQ
MAX38643AELT+: FAQ
+MAX38643AELT+T: FAQ
+MAX38643AENT+T: FAQ
+MAX38886ATD+: FAQ
MAX38888ATD+: FAQ
+MAX38888ATD+T: FAQ
+MAX38889AATE+: FAQ
+MAX38902AATA+: FAQ
+MAX38902EVKIT#: FAQ
+MAX38903AANL+: FAQ
+MAX38908ANL+: FAQ
+MAX40200: FAQ
+MAX40200ANS+: FAQ
+MAX40200AUK+: FAQ
+MAX40200AUK+T: FAQ
+MAX40203ANS+: FAQ
+MAX40203ANS+T: FAQ
+MAX4370: FAQ
+MAX4427MJA/883B: FAQ
+MAX4428ESA+: FAQ
+MAX44299: FAQ
+MAX4820ETP+: FAQ
+MAX4821: FAQ
+MAX4821: FAQ
+MAX4896ATP+: FAQ
+MAX4896ATP+: FAQ
+MAX4915AELT+: FAQ
+MAX5033: FAQ
MAX5035: FAQ
+MAX5035AASA+: FAQ
+MAX5035EASA/V+T: FAQ
+MAX5048: FAQ
+MAX5048CAUT+: FAQ
+MAX5082: FAQ
+MAX5084ATT+T: FAQ
+MAX5085ATT+: FAQ
+MAX5902AAEUT+: FAQ
+MAX5903AAETT+: FAQ
+MAX5903AAETT+: FAQ
+MAX5921FESA+: FAQ
+MAX5943AEEE+: FAQ
+MAX5947BESA: FAQ
+MAX5954AETX+: FAQ
MAX5954AETX+: FAQ
+MAX5954LETX+: FAQ
+MAX5965A: FAQ
+MAX5969AETB+: FAQ
MAX5969AETB+: FAQ
+MAX5969BETB+: FAQ
+MAX5969BEVKIT+: FAQ
+MAX5971AETI+: FAQ
+MAX5971BETI+: FAQ
+MAX5974AATE+T: FAQ
+MAX5974CETE+: FAQ
MAX5974CETE+: FAQ
+MAX5974D: FAQ
MAX5974DATE+: FAQ
+MAX5974DATE+: FAQ
+MAX5974EETE+: FAQ
+MAX5977AETP+: FAQ
+MAX5980AGTJ+: FAQ
+MAX5991AETP+: FAQ
+MAX5995AATE+: FAQ
+MAX5995AETE+T: FAQ
MAX5995B: FAQ
MAX5995BATE+: FAQ
+MAX5995CETE+: FAQ
+MAX618EEE+: FAQ
+MAX6301: FAQ
+MAX6335: FAQ
+MAX6340_UK16+_A1: FAQ
+MAX634MJA/883B: FAQ
MAX6369: FAQ
+MAX6369KA+T: FAQ
+MAX6381XR26D3/V+T: FAQ
+MAX6389_XS16D3_A1: FAQ
MAX6412: FAQ
+MAX6412_UK16+_A1: FAQ
+MAX6420UK29+T: FAQ
+MAX6425: FAQ
+MAX6443: FAQ
+MAX6461: FAQ
MAX6495: FAQ
+MAX6495: FAQ
+MAX6496ATA/V+: FAQ
+MAX651MSA/PR+_T1: FAQ
+MAX6615AEE+: FAQ
+MAX6615AEE+: FAQ
+MAX6615AEE: FAQ
+MAX6639: FAQ
MAX6639: FAQ
+MAX6639FAEE: FAQ
+MAX6641: FAQ
+MAX6641: FAQ
+MAX6643LBBAEE+: FAQ
+MAX6650EUB+: FAQ
MAX6650EUB+: FAQ
+MAX6653AEE+: FAQ
MAX6684ESA+: FAQ
+MAX6684ESA+: FAQ
+MAX668EUB+: FAQ
+MAX668EUB_T1: FAQ
+MAX668EVKIT+: FAQ
+MAX6710KUT+: FAQ
+MAX6719AUTSVD3+T: FAQ
+MAX6722UTSDD3+: FAQ
+MAX6735A: FAQ
+MAX6735_KASYD3+_A1: FAQ
+MAX6747: FAQ
+MAX6753: FAQ
+MAX6759: FAQ
+MAX6764UT+: FAQ
MAX680CSA+: FAQ
+MAX6816: FAQ
+MAX6842DUKD0+T: FAQ
+MAX6867: FAQ
+MAX6895AALT+: FAQ
+MAX6895AAZT/V+T: FAQ
+MAX6975ATL+: FAQ
+MAX700CPA+: FAQ
+MAX705ESA+: FAQ
MAX706: FAQ
+MAX706SESA: FAQ
+MAX77324EWT00+: FAQ
+MAX77324EWTAD+: FAQ
+MAX774ESA+: FAQ
MAX77501EWV+: FAQ
+MAX77501EWV+T: FAQ
+MAX77503AEWC+T: FAQ
+MAX77503BEWC18+: FAQ
+MAX77504AAFC+T: FAQ
+MAX77542: FAQ
+MAX77597EVKIT#: FAQ
MAX775: FAQ
+MAX77643AANA+: FAQ
+MAX77655EWE+T: FAQ
+MAX77686: FAQ
+MAX77714EWC+: FAQ
+MAX77752AETL+: FAQ
+MAX77756: FAQ
+MAX77801ETP+: FAQ
+MAX77801_TP+_A1: FAQ
+MAX77812 EVALUATION KIT SOFTWARE: FAQ
+MAX77812AEWB+: FAQ
+MAX77812BEWB+: FAQ
+MAX77812CEWB+T: FAQ
MAX77812EWB+: FAQ
+MAX77812EWB+T: FAQ
+MAX77813EWP+: FAQ
+MAX77816AEWP+: FAQ
+MAX77816CEWP+T: FAQ
+MAX77827AEFD+_T1: FAQ
+MAX77827AEWC+: FAQ
+MAX77837: FAQ
+MAX77839: FAQ
+MAX77863AEWJ+: FAQ
+MAX77874: FAQ
+MAX786: FAQ
+MAX797MJE: FAQ
+MAX813LCPA: FAQ
+MAX8212CPA+: FAQ
+MAX821LUS+T: FAQ
+MAX823L: FAQ
+MAX823TEUK+: FAQ
+MAX824: FAQ
+MAX834EUK+: FAQ
+MAX8535: FAQ
+MAX8556ETE+: FAQ
+MAX8559ETAAJ+: FAQ
+MAX8569AETT+: FAQ
+MAX8570ELT+: FAQ
+MAX8570EUT+: FAQ
+MAX8597ETP+: FAQ
+MAX8607ETD+: FAQ
+MAX860MSA/PR2+_T1: FAQ
+MAX8625AETD+: FAQ
+MAX8647ETE+: FAQ
+MAX8664: FAQ
+MAX8668: FAQ
+MAX8686ETL+: FAQ
+MAX8794ETB+: FAQ
+MAX8815AETB+T: FAQ
+MAX8840ELT18+: FAQ
+MAX8858ETJ+: FAQ
+MAX8869EUE18+: FAQ
+MAX8881: FAQ
+MAX8887EZK18+T: FAQ
+MAX8892: FAQ
+MAX889RESA+: FAQ
+MAX8902AATA+: FAQ
+MAX8902AATA/V+: FAQ
+MAX8902B: FAQ
MAX8969AEWL53+: FAQ
+MAX8969AEWL53+T: FAQ
+MAXM15064AMB+T: FAQ
+MAXM15462AMB+: FAQ
+MAXM17502EVKIT#: FAQ
+MAXM17503ALJ+: FAQ
+MAXM17504EVKITAE#: FAQ
+MAXM17505: FAQ
+MAXM17515: FAQ
MAXM17532: FAQ
+MAXM17532AMB+T: FAQ
MAXM17537ALY#: FAQ
+MAXM17537ALY#T: FAQ
+MAXM17544ALJ+: FAQ
+MAXM17544EVKIT#: FAQ
MAXM17545: FAQ
+MAXM17545ALJ+T: FAQ
+MAXM17552: FAQ
+MAXM17575ALI#T: FAQ
+MAXM17575EVKIT#: FAQ
+MAXM17623AMB+T: FAQ
+MAXM17624AMB+: FAQ
+MAXM17635AMG+: FAQ
+MAXM17761ALI+: FAQ
+Measuring Signals: FAQ
+Package Information: FAQ
+Photosensitive: FAQ
+Power Management Support Intro: FAQ
+Switching Power: FAQ
+Temperature Grade: FAQ
+uPMU: FAQ
+VT1697SBFQX: FAQ
What is the maximum current the flag pin on the MAX17613A can sink?
When using two LTC4359 controllers with different input voltages, why does the high-side MOSFET turn off during source transition?
Where can I get the LTC9101-3 software interface datasheet?
Where can I get the LTM2987BY datasheet from?
Why does the MAX5995B on the MAXREFDES1266 consume 13mA even at light loads?