Toshiba TCK401G User Manual Download

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RD002-RGUIDE-01

2018-03-07

Rev. 1

1

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15

© 2018

Toshiba Electronic Devices & Storage Corporation

MOSFET Driver IC

Application and Circuit of the TCK401G

Reference Guide

RD002-RGUIDE-01

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Summary of Contents for TCK401G

Page 1: ...RD002 RGUIDE 01 2018 03 07 Rev 1 1 15 2018 Toshiba Electronic Devices Storage Corporation MOSFET Driver IC Application and Circuit of the TCK401G Reference Guide RD002 RGUIDE 01 ...

Page 2: ...on circuit example 4 2 2 Bill of materials 4 3 MAJOR FEATURES 5 3 1 SLEW RATE CONTROL 5 3 2 AUTO OUTPUT DISCHARGE FUNCTION 8 4 DESIGN CONSIDERATIONS 10 5 PRODUCT OVERVIEW 12 5 1 TCK401G 12 5 1 1 Overview 12 5 1 2 External view and pin assignment 13 5 1 3 Internal block diagram 13 5 1 4 Pin description 14 5 2 SSM6K513NU 14 5 2 1 Overview 14 5 2 2 External view and pin assignment 14 5 2 3 Internal b...

Page 3: ...ate control driver contributes avoiding unexpected inrush current during switching transitions in order to protect next stage electronic circuits In addition the auto output discharge function at switch off feature can be used for applications requiring stringent power management without any concern about time lag between a switch off signal and the output voltage reaching to zero This reference g...

Page 4: ...the TCK401G MOSFET driver IC Figure 2 1 1 Application circuit example for the TCK401G MOSFET driver IC 2 2 Bill of materials Table 2 2 1 Bill of materials No Ref Qty Value Part Number Manufacturer Description Packaging Typical Dimensions mm inches 1 C1 C2 2 1μF Ceramic 50 V 10 1005 1 0 x 0 5 0402 2 Q1 Q2 2 SSM6K513NU TOSHIBA N channel MOSFET UDFN6B 2 0 x 2 0 ３ U1 1 TCK401G TOSHIBA MOSFET driver IC...

Page 5: ...rrent might generate electromagnetic interference EMI that affects bad impact to electronic circuits So it is necessary to suppress inrush current during switch on transitions Figure 3 1 2 shows an enlarged view of the ringing waveforms Figure 3 1 1 Example of waveforms of a load switch with discrete solution Figure 3 1 2 Example of waveforms of a load switch with discrete solution enlarged view T...

Page 6: ...f the MOSFETs depends on their gate capacitance and threshold voltage Vth The TCK401G specifies VGATE ON time tON at a gate capacitance of 2000pF The assumption comes from the TCK401G being used to drive two back to back MOSFETs and each gate capacitance has roughly 1000pF When the TCK401G drives MOSFETs with lower gate capacitance VGATE ON time is less than the number in the datasheet This means ...

Page 7: ...TCK401G 40 C Figure 3 1 5 Example of switching waveforms of back to back MOSFETs driven by the TCK401G 85 Test conditions VIN 5V VCT 0 5V Output current 5A COUT 4 7μF Ta 40 C Test conditions VIN 5V VCT 0 5V Output current 5A COUT 4 7μF Ta 85 C VCT 5V div Output current 5A div Output voltage 5V div VCT 5V div Output current 5A div Output voltage 5V div 200μs div 200μs div ...

Page 8: ...reasing When a system needs to shut down a power supply for a SoC the amount of charge remaining in a large value capacitor could be uncontrollable and cause system malfunction To avoid this problem the TCK401G has the auto output discharge function which is designed to discharge the remaining amount of charge from the output capacitors for external MOSFETs at switch off in order to pull down quic...

Page 9: ...mperature Figure 3 2 3 and Figure 3 2 4 show examples of MOSFET switching waveforms at 40 C and 85 C Figure 3 2 3 Output waveforms with the auto output discharge function 40 C The output drops to zero quickly Test conditions VIN 5V VCT 0 5V IOUT 5A COUT 4 7μF Ta 25 C VCT 5V div Output current 5A div Output voltage 5V div VCT 5 V div Output current 5 A div Output voltage 5 V div Test conditions VIN...

Page 10: ...ufficiently higher than their operating voltage VCT pin The VCT pin of the TCK401G is a Schmitt trigger input The VCT pin is tolerant of a voltage higher than the specified control voltage VGATE pin The VGATE output drives the gate inputs of external MOSFETs When the VCT input goes High VGATE output goes High with the TCK401G boosting up the voltage from VIN input The following shows the slew rate...

Page 11: ...ircuit which the TCK401G drives two MOSFETs the VSRC pin has internal MOSFET and make short circuits to the VGATE output through the source of the MOSFETs when the TCK401G turns off The VSRC pin may be left open if the MOSFET gate source voltage VGS has enough margin In cases of the TCK401G driving only one MOSFET the VSRC pin may also be left open if the MOSFET gate source voltage VGS has enough ...

Page 12: ... 5 1 TCK401G 5 1 1 Overview The TCK401G MOSFET driver IC operates over a wide input voltage range of up to 28V MOSFET driver IC in a small package High maximum input voltage VIN max 40V Wide input voltage range VIN 2 7 to 28V Auto output discharge function Charge pump for VGATE Inrush current suppression circuit Overvoltage lockout 28V Undervoltage lockout 2 7V Protection against reverse current f...

Page 13: ... Corporation 5 1 2 External view and pin assignment Figure 5 1 1 External view marking and pin assignment of the TCK401G 5 1 3 Internal block diagram Figure 5 1 2 Internal block diagram of the TCK401G Bottom view Marking top view External view and marking Pin assignment Top view ...

Page 14: ...ment Figure 5 2 1 External view marking and pin assignment of the SSM6K513NU 5 2 3 Internal block diagram Figure 5 2 2 Internal block diagram of the SSM6K513NU End of Document Pin Name Description A1 VGATE Gate driver output A2 VIN Supply voltage B1 VSRC It is recommended to connect the VSRC output to the common source of external MOSFETs B2 GND Ground C1 DIS Output discharge pin C2 VCT Mode Contr...

Page 15: ...s which minimize risk and avoid situations in which a malfunction or failure of semiconductor devices could cause loss of human life bodily injury or damage to property including data loss or corruption Customers must also refer to and comply with the latest versions of all relevant our information including without limitation specifications data sheets and application notes for semiconductor devi...

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