FSB50825AS datasheet(7/11 Pages) ONSEMI

7 / 11 page

www.fairchildsemi.com

FSB50825AS Rev. 1.6

Figure 3. Recommended MCU Interface and Bootstrap Circuit with Parameters

3rd Notes:

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

2. RC-coupling (R5 and C5) and C4 at each input of Motion SPM 5 product and MCU (Indicated as Dotted Lines) may be used to prevent improper signal due to surge-noise.

3. Bold lines should be short and thick in PCB pattern to have small stray inductance of circuit, which results in the reduction of surge-voltage. Bypass capacitors such as C1, C2

and C3 should have good high-frequency characteristics to absorb high-frequency ripple-current.

Figure 4. Case Temperature Measurement

3rd Notes:

4. Attach the thermocouple on top of the heat-sink of SPM 5 package (between SPM 5 package and heatsink if applied) to get the correct temperature measurement.

Figure 5. Temperature Profile of VTS (Typical)

HIN

LIN

Output

Note

Both FRFET Off

Low side FRFET On

VDC

High side FRFET On

Forbidden

Shoot through

Open

Same as (0,0)

COM

VCC

LIN

HIN

Inverter

Output

+15 V

F

These values depend on PWM control algorithm

* Example of Bootstrap Paramters

1= C2 = 1 F Ceramic Capacitor

VTS

* Example Circuit : V phase

One Leg Diagram of Motion SPM

® 5 Product

100

120

140

160

0.5

1.0

1.5

2.0

2.5

3.0

3.5

THVIC [

oC]

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