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Operation With External Bootstrap Diode

7

SLUUC42 – January 2020

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Using the LM5108EVM

6

Operation With External Bootstrap Diode

The LM5108EVM has an internal bootstrap diode included, the series resistor (R10) is not populated. This
allows the user to evaluate pin compatible drivers that do not have the internal bootstrap diode which is
included with the LM5108 High-Side and Low-Side Driver.

As a general guideline, when using the external bootstrap diode a resistance value of 2.2

Ω

to 10

Ω

is

recommended. Install R10 1206 size resistor for evaluation of pin compatible drivers without the internal
bootstrap diode.

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Содержание LM5108EVM

Страница 1: ...With External Bootstrap Diode 7 7 Typical Performance Waveforms CL 1000 pF 8 7 1 Propagation Delays 8 8 Schematic 9 9 Layout Diagrams 10 10 List of Materials 14 List of Figures 1 Bench Setup Diagram and Configuration 5 2 Example Input and Output Waveforms Green and Magenta are PWM Inputs Yellow and Blue are Driver Outputs 6 3 HI and HO Propagation Delay Waveforms Green and Magenta are PWM Inputs Y...

Страница 2: ... prevents turning on the high side and low side MOSFETs at the same time enhancing robustness of the power train design 2 Description The EVM is developed in such a way that the LM5108 driver performance can be evaluated and compared to data sheet parameters or externally connected to power devices with provisions for source and sink gate resistance flexibility The LM5108EVM evaluation board uses ...

Страница 3: ...IN Low side input to EVM LI Low side input pin LI ENA_IN Enable input to EVM Connect to GND to disable driver VHB HB pin voltage HO LD High side output at capacitive load HO High side output pin HS High side driver return pin Usually connected to high side MOSFET source LO LD Low side output at capacitive load LO Low side output pin 3 Electrical Specifications Refer to the LM5108 Datasheet for the...

Страница 4: ...Hz for example Tektronics AFG3252 4 2 3 DMM DMM with voltage and current above 25 V and 1 A for example Fluke 187 4 2 4 Oscilloscope Four channel oscilloscope with 500MHz or greater bandwidth for example DPO 7054 4 3 Equipment Setup 4 3 1 DC Power Supply Settings DC power supply 1 Voltage setting 12 V Current limit 0 05 A 4 3 2 Digital Multi Meter Settings DMM 1 DC current measurement auto range E...

Страница 5: ...ction generator and oscilloscope connections Use the following connection procedure refer to Figure 1 First make sure the output of the function generator and power supplies are disabled before connection Apply function generator channel A on HI_IN GND Apply function generator channel B on LI_IN GND Power supply 1 apply positive lead to current input of DMM 1 and current output of DMM 1 to test po...

Страница 6: ... on channel 1 and channel 2 in the oscilloscope refer to Figure 2 2 Frequency measurement should be 100 kHz 5 kHz or equal to the programmed function generator frequency 3 DMM 1 should display around 4 6 mA 2 mA with the default load capacitance of 1 0nF For more information about operating current refer to UCC2728x Datasheet 5 Connect ENA_IN test point to GND test point with a Jumper The pulse ou...

Страница 7: ...strap diode included the series resistor R10 is not populated This allows the user to evaluate pin compatible drivers that do not have the internal bootstrap diode which is included with the LM5108 High Side and Low Side Driver As a general guideline when using the external bootstrap diode a resistance value of 2 2Ω to 10Ω is recommended Install R10 1206 size resistor for evaluation of pin compati...

Страница 8: ...below illustrate the HI input and HO output on the top traces and the LI input and LO output on the bottom traces in each plot To evaluate propagation delays and rising and falling details it is recommended to have scope probe connections with short ground leads see Figure 3 and Figure 4 Figure 3 HI and HO Propagation Delay Waveforms Green and Magenta are PWM Inputs Yellow and Blue are Driver Outp...

Страница 9: ...n Feedback Copyright 2020 Texas Instruments Incorporated Using the LM5108EVM 8 Schematic Figure 5 shows the LM5108EVM schematic diagram Figure 5 LM5108EVM Schematic U2 is not installed since it is an alternate driver IC used on a different board assembly variation ...

Страница 10: ...UUC42 January 2020 Submit Documentation Feedback Copyright 2020 Texas Instruments Incorporated Using the LM5108EVM 9 Layout Diagrams The PCB layout information for LM5108EVM is shown in Figure 6 through Figure 11 Figure 6 Top Overlay ...

Страница 11: ...www ti com Layout Diagrams 11 SLUUC42 January 2020 Submit Documentation Feedback Copyright 2020 Texas Instruments Incorporated Using the LM5108EVM Figure 7 Top Layer ...

Страница 12: ...5 U2 R10 C11 Layout Diagrams www ti com 12 SLUUC42 January 2020 Submit Documentation Feedback Copyright 2020 Texas Instruments Incorporated Using the LM5108EVM Figure 8 Bottom Layer Figure 9 Bottom Overlay ...

Страница 13: ...www ti com Layout Diagrams 13 SLUUC42 January 2020 Submit Documentation Feedback Copyright 2020 Texas Instruments Incorporated Using the LM5108EVM Figure 10 Top Image Figure 11 Bottom Image ...

Страница 14: ...P0 0603 C0603C100J5GACTU Kemet D1 D2 2 Diode Schottky 30 V 1 A AEC Q101 MicroSMP MSS1P3L M3 89A Vishay Semiconductor D3 1 Diode Ultrafast 200 V 1 A SMA ES1D 13 F Diodes Inc H1 H2 H3 H4 4 Bumpon Hemisphere 0 44 X 0 20 Clear SJ 5303 CLEAR 3M LBL1 1 Thermal Transfer Printable Labels 0 650 W x 0 200 H 10 000 per roll THT 14 423 10 Brady R1 R2 2 RES 2 2 5 0 125 W 0805 CRCW08052R20JNEA Vishay Dale R3 R5...

Страница 15: ...other than TI b the nonconformity resulted from User s design specifications or instructions for such EVMs or improper system design or c User has not paid on time Testing and other quality control techniques are used to the extent TI deems necessary TI does not test all parameters of each EVM User s claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects...

Страница 16: ... These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation...

Страница 17: ...y for convenience and should be verified by User 1 Use EVMs in a shielded room or any other test facility as defined in the notification 173 issued by Ministry of Internal Affairs and Communications on March 28 2006 based on Sub section 1 1 of Article 6 of the Ministry s Rule for Enforcement of Radio Law of Japan 2 Use EVMs only after User obtains the license of Test Radio Station as provided in R...

Страница 18: ... any interfaces electronic and or mechanical between the EVM and any human body are designed with suitable isolation and means to safely limit accessible leakage currents to minimize the risk of electrical shock hazard User assumes all responsibility and liability for any improper or unsafe handling or use of the EVM by User or its employees affiliates contractors or designees 4 4 User assumes all...

Страница 19: ...OR DAMAGES ARE CLAIMED THE EXISTENCE OF MORE THAN ONE CLAIM SHALL NOT ENLARGE OR EXTEND THIS LIMIT 9 Return Policy Except as otherwise provided TI does not offer any refunds returns or exchanges Furthermore no return of EVM s will be accepted if the package has been opened and no return of the EVM s will be accepted if they are damaged or otherwise not in a resalable condition If User feels it has...

Страница 20: ...se resources are subject to change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reproduction and display of these resources is prohibited No license is granted to any other TI intellectual property right or to any third party intellectual property right TI disclaims responsibility for...

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