STK6103 datasheet(9/11 Pages) SANYO

9 / 11 page

STK6103

No. 4290- 9/11

Fig.6 Starting Current

Fig.7 Conversion Circuit for Hall IC and Hall Device Signal

Fig.8

Thermal Radiation Design

(1)

Internal average power dissipation Pd

The driver transistors represent the majority of the power dissipation in operation. Other losses are V

CC2 and

the charge pump circuit. In PWM drive in particular, the diode in the V

CC1 transistor is being used as a

flywheel diode, increasing V

CC1 transistor loss. When these are included, internal mean power dissipation is:

Pd = Io (Vst

1 + VFd2 + Vst2d1) + PdA + PdB + PdC ·······················

: Motor current

Vst

1 : VCC1 transistor saturation voltage

Vst

2 : GND transistor saturation voltage

: GND transistor PWM operation on duty

: GND transistor PWM operation off duty

: V

CC2 loss

: Charge pump circuit loss

: GND transistor switching loss

: V

CC1 transistor internal diode normal direction voltage

Because the driver transistor is a MOSFET, Vst

1 and Vst2 will increase with an increase in IO or substrate

temperature Tc.

A and PdB are generally given as:

A ≈ VCC2 x ICCO1 ········································································

B ≈ VCC1 x (0.49VCC1 – 4.2) x 0.001········································

where, V

CC1 = 16 to 42V

Refer to Figs. 11 to 14 for data on Vst

1, Vst2, d1 and VF.

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