6

www.fairchildsemi.com

FSB50250AB Rev. A

Note:

1. Parameters for bootsrap circuit elements are dependent on PWM algorithm. For 15 kHz of switching frequency, typical example of parameters is shown above.

is compatible with standard CMOS or LSTTL outputs.

Figure 3. Recommended CPU Interface and Bootstrap Circuit with Parameters

Note:

Figure 4. Case Temperature Measurement

HIN

LIN

Output

Note

0

0

Z

Both FRFET Off

0

1

0

Low side FRFET On

1

0

High side FRFET On

1

1

Forbidden

Shoot through

Open

Open

Z

Same as (0,0)

COM

VCC

LIN

HIN

VB

HO

VS

LO

P

N

R

3

Inverter

Output

C

3

C

1

15 V

Line

10mF

One Leg Diagram of SPM

These values depend on PWM

control algorithm

* Example of bootstrap paramters

:

C

R

5

C

5

V

DC

C

2

Vts

* Example circuit : W phase

C

4

V

20

40

60

80

100

120

140

160

0.5

1.0

1.5

2.0

2.5

3.0

3.5