L8150 datasheet(23/37 Pages) STMICROELECTRONICS

부품명	L8150

상세설명	Brushless motor predriver

PDF	37 Pages

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제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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L8150

Operating description

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5.3

Speed Control Circuitry

The rotation speed control signal (VSP) is an external signal, whose range is 2.1V

÷5.4V.

This signal is amplified by an inverting amplifier which takes as reference a voltage derived

from VREG through a voltage divider.

The amplifier output is the input signal of an 8-bit ADC which generates the digital word

KVAL, used to determine the duty cycle value according to the following Figure 13:

Speed control:

Intout 0-0.7V: duty =100% for smooth drive

(max duty is limited at about 95% for rectangular as shown in the following figure)

Intout 0.7-3.7V: duty control 100-0%

Intout 3.7-4.5: duty = 0 %

Intout 4.5V - 5V (VREG): all power off (all 6 output = GND)

(Each Vth depends linearly on VREG, being obtained by means of voltage dividers).

Figure 13.

Duty cycle

L8150 데이터시트(PDF) 23 Page - STMicroelectronics