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Rohm TO-247N, User Manual

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14/27

 

TO-247N(-4L) Half-Bridge Evaluation Board 

User’s Guide 

© 2022 ROHM Co., Ltd.

 

No. 63UG0

60E

 Rev.001

 

2022.2

 

Figure 14 Measurement view of heat sink installation

 

Figure 15 Efficiency 

(SCT4036KR, BUCK, Rg=3.3Ω)

 

DUT 

(Mounted  on  the 

solder side) 

Inductor 

Heat Sink 

Input Bulk 
Capacitor

 

Output Bulk 
Capacitor

 

Summary of Contents for TO-247N

Page 1: ...4th Generation SiC MOSFET Half Bridge Evaluation Board User s Manual...

Page 2: ...in serious or life threatening injury Never touch the board with bare hands or bring it too close to your hand Also be careful when working with conductive instruments such as tweezers or screwdriver...

Page 3: ...kage and TO 247 4L For detailed information on product specifications please refer to 4th generation SiC MOSFET Evaluation Board Product Specifications 1 Introduction Since this board has multiple vol...

Page 4: ...SCT4018KR as a default setting surely other devices in TO 247N or TO 247 4L packages can also be mounted and evaluated In this case change the gate drive circuit constants according to the characteris...

Page 5: ...equipped with a number of LEDs to make it easy to monitor the board s operating status The approximate locations of the LEDs are shown in Figure 2 and their details are shown in Table 2 a PCB004P for...

Page 6: ...ng connector Figure 3 Connector pin assignment Top view Silkscreen notation LED LED lighting Details HV alive Red Lit The LED lights up when there is a voltage of 20 V or more in the high voltage powe...

Page 7: ...at H level When open it is pulled down with a 2 2 k resistor 02 SGND Input signal side GND Completely separated from the DUT side GND CN101 01 IN_L_CLK I Signal to turn on off the L side MOSFET Turns...

Page 8: ...e adjusted by the variable resistors RV51 and RV151 Rotating the variable resistors clockwise increases the output voltage 4 2 How to adjust the negative bias VEE2 The negative bias VEE2 which is the...

Page 9: ...8 27 TO 247N 4L Half Bridge Evaluation Board User s Guide 2022 ROHM Co Ltd No 63UG060E Rev 001 2022 2 Figure 5 Gate drive power supply circuit HS side VCC2 SOURCE VEE GND2...

Page 10: ...he output signal of the ROHM MOSFET driver IC BM61M41RFV C directly drives the MOSFET via the gate resistor Since the pattern inductance of the driver circuit affects the surge voltage characteristics...

Page 11: ...mounted in reverse If the anode is connected to the OUT pin of the driver IC U2 the turn on speed can be increased so it can be used in different ways depending on the characteristics of the device us...

Page 12: ...easure the current at the drain pin and the L side can measure the current at the power source side Figure 9 shows the appearance of the probe related connections during measurement and the enlarged p...

Page 13: ...6 shows a comparison of the characteristics of a general Rogowski type current probe and a coaxial type shunt resistor While the Rogowski type has a measurement bandwidth of several tens of MHz the co...

Page 14: ...consumption of the device itself reaches several tens of Watts To install a heat sink the device must be mounted on the solder side The DUT is laid out on the same side so that the commutation device...

Page 15: ...User s Guide 2022 ROHM Co Ltd No 63UG060E Rev 001 2022 2 Figure 14 Measurement view of heat sink installation Figure 15 Efficiency SCT4036KR BUCK Rg 3 3 DUT Mounted on the solder side Inductor Heat Si...

Page 16: ...lied voltage V L Inductor value H TDP_TTL Total time of double pulse signal s Normally the double pulse signal is a single shot but when it is applied periodically it is necessary to ensure sufficient...

Page 17: ...r and connecting the external CLK signal to the IN_L_CLK pin CN101 pin 1 the procedure is the same as for the H side Pulse Generator 5V output PGND HVdc DUT_HS DUT_LS HS GADJ LS GADJ IN_H_CLK IN_L_CLK...

Page 18: ...the CLK signal Turn on the HVdc power supply Adjust the output current with an electronic load device In CCM mode where the inductor current is continuous the output voltage will be approximately as f...

Page 19: ...high voltage HVdc power supply When the AC output is on the side the H side switches and when it is on the side the L side switches and by controlling the duty cycle of the CLK signal a sinusoidal vo...

Page 20: ...e pulse generator and input the CLK signal Turn on the HVdc power supply Adjust the output current with an electronic load device In CCM mode where the inductor current is continuous the output voltag...

Page 21: ...circuit diagram and an example of its mounting a Circuit diagram b Mounting example PCB005P H side Figure 21 RCD non discharge snubber circuit Q51 Q151 PGND SCT4090KRKR 1200V 90m SCT4090KR 1200V 90m 3...

Page 22: ...SFET On the other hand the capacitance CSNB of the snubber capacitor is calculated from the energy stored in the inductance by the following equation Where VHVdc is the high voltage power supply and V...

Page 23: ...Negative surge suppression D54 C64 D154 C164 During turn off operation of the MOSFET in bridge configuration a negative surge occurs in VGS of the non switching side MOSFET which may exceed the maxim...

Page 24: ...g the pattern line length between the MC pin and the MOSFET II Negative surge clamp circuit I Positive surge clamp circuit IV Additional capacitance between GS CGS Figure 24 shows an example of a prot...

Page 25: ...s VGS on the L side the third is VDS on the H side and the bottom waveform is ID on the H side The gate source pin surge is positive on the H side during turn on and negative on the HS and L sides dur...

Page 26: ...up When voltage is applied to the HVdc PGND pins check that LED301 red is lit If the LED does not light up check the applied voltage source and wiring The LED lights up when the input output voltage...

Page 27: ...cuit Design Methods Application Note No 62AN0036JRev 001 ROHM Co Ltd June 2019 https fscdn rohm com en products databook applinote discrete sic mosfet sic mos_snubber_circuit_design_an e pdf 4 Improve...

Page 28: ...ch technical information The Products specified in this document are not designed to be radiation tolerant For use of our Products in applications requiring a high degree of reliability as exemplified...

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