www.basicsemi.com

16/19

Rev.0.0

Dual-ChannelIsolatedGateDriver

BTD21520x

10.Applications

The following sections introduce the basic typical application of BASiC driver ICs, which is for reference only. In practi-

cal application, users need to verify and test its applicability according to their own design requirements to confirm the

system function.

10.1TypicalApplications

BASiC recommends that customers add a RC filter with a small time constant at the input port to filter out high-frequen-

cy interference without adding a large delay. It is recommended that the resistance value should be between 0 and 100Ω

and the capacitance should be less than 1000pF. When setting this parameter, the influence between high frequency

interference and delay needs to be taken into account.

To ensure the supply stability, BASiC recommends adding an appropriate capacitor between the power supply and

ground. It is recommended that the primary side supply VCC-GND be connected in parallel with 1uF+ 0.1uF capacitor

CVCC, and the secondary side supply VDD-VEE be connected with 10uF+ 0.22uF capacitors CVDD1 and CVDD2.

The bootstrap capacitor is charged by VDD through an external bootstrap diode every cycle when the low side transistor

turns on. Charging the capacitor involves high-peak currents, and therefore transient power dissipation in the bootstrap

diode may be significant. Conduction loss also depends on the diode’s forward voltage drop. Both the diode conduc-

tion losses and reverse recovery losses contribute to the total losses in the gate driver circuit.

The recommended value for RBOOT is between 1 Ω and 20 Ω depending on the diode used.

Figure13-1.BTD21520MApplicationDiagram

Figure13-2.BTD21520EApplicationDiagram

RBOOT

RGS

RON

ROFF DGATE

CVDD1

SW

VDD

VDD1

OUT1

VEE1

HV DC-Link

CIN

Functional

Isolation

RGS

RON

ROFF DGATE

CVDD2

VDD

VDD2

OUT2

VEE2

PWM

VCC

RIN

VCC

VCC

PWM

GND

DIS

DT

VCC

Analog or

Digital

Disable

RDIS

CDIS

RT

CDT

2.2nF

CIN

CVCC

3

1

4

5

8

6

16

15

14

11

10

9

RGS

RON

ROFF

DGATE

CVDD1

SW

VDD

VDD1

OUT1

VEE1

HV DC-Link

CIN

Functional

Isolation

RGS

RON

ROFF

DGATE

CVDD2

VDD

VDD2

OUT2

VEE2

VEE

IN1

VCC

RIN

VCC

GND

DIS

DT

VCC

Disable

RDIS

CDIS

RT

CDT

2.2nF

CIN

CVCC

3

1

4

5

8

6

16

15

14

11

10

9

IN2

2

VCC

PWM1

PWM2

Analog or

Digital

RBOOT

VEE

VEE

VEE

RBOOT

RGS

RON

ROFF DGATE

CVDD1

SW

VDD

VDD1

OUT1

VEE1

HV DC-Link

CIN

Functional

Isolation

RGS

RON

ROFF DGATE

CVDD2

VDD

VDD2

OUT2

VEE2

PWM

VCC

RIN

VCC

VCC

PWM

GND

DIS

DT

VCC

Analog or

Digital

Disable

RDIS

CDIS

RT

CDT

2.2nF

CIN

CVCC

3

1

4

5

8

6

16

15

14

11

10

9

RGS

RON

ROFF

DGATE

CVDD1

SW

VDD

VDD1

OUT1

VEE1

HV DC-Link

CIN

Functional

Isolation

RGS

RON

ROFF

DGATE

CVDD2

VDD

VDD2

OUT2

VEE2

VEE

IN1

VCC

RIN

VCC

GND

DIS

DT

VCC

Disable

RDIS

CDIS

RT

CDT

2.2nF

CIN

CVCC

3

1

4

5

8

6

16

15

14

11

10

9

IN2

2

VCC

PWM1

PWM2

Analog or

Digital

RBOOT

VEE

VEE

VEE