5

Test circuits and typical application diagrams

Figure 3. Test circuit 1

Low current dead time = MAX (DTr, DTf)

OUTxY

Vcc

(3/4)Vcc

(1/2)Vcc

(1/4)Vcc

t

DTf

DTr

Duty cycle = 50%

INxY

OUTxY

gnd

+Vcc

M58

M57

R 8Ω

+

-

V67 =

vdc = Vcc/2

Figure 4. Test circuit 2

INxA

INxB

+VCC

Q1

Q3

Q2

Q4

OUTxA

GND

OUTxB

Figure 5. Test circuit 3

High Current Dead time for Bridge application = ABS [DTout(A) - DTin(A)] + ABS [DTOUT(B) - DTin(B)]

+VCC

Rload = 8 Ω

Q2

OUTB

)

B

(

n

i

T

D

)

B

(

t

u

o

T

D

DTout(A)

C71 470 nF

C70

470 nF

C69

470 nF

Iout = 4 A

Iout = 4 A

Q4

Q1

Q3

M64

INB

M63

M58

INA

M57

DTin(A)

Duty cycle = A

Duty cycle = B

Duty cycle A and B: Fixed to have DC output current of 4 A in the direction shown in figure

L68 22 µ

L67 22 µ

OUTA

STA508

Test circuits and typical application diagrams

DS3503 - Rev 6

page 8/19