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ST1115C Fiches technique(PDF) 9 Page - Silicon Touch Technology Inc. |
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ST1115C Fiches technique(HTML) 9 Page - Silicon Touch Technology Inc. |
9 / 13 page 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. ST1115C/ST1115D SP-ST1115CD-A.005 Version :A.005 Page :8 3. Fan speed control by the PWM command ―Refer to Figure 5. VSS VSS VSS VSS VSS VSS VSS Q1 R4 R3 R1 PWM R2 10K 75 1u 1u IC Hall ST1115C C1 RD Digital Power GND Hin VT CF C2 O2 O1 Analog Power Z2 Z1 D1 RD VDD Figure 5. Fan speed control via the PWM command. (1) Figure 5 shows the application circuit, where the fan speed is directly controlled by the PWM command. The BJT Q1 together with resistors R1 and R2 constitutes an inverting level shifter, which is responsible for translating the voltage level of the PWM command to the VDD voltage level of the drive IC. In this way, the voltage level of the PWM command can be very low, say, 2 Volt, for example. (2) For this circuit, the PWM command is active high and its frequency range is 200 Hz ~ 40 KHz. If low acoustic noise is desired, the 20 KHz~40 KHz of the PWM frequency range is recommended. |
Numéro de pièce similaire - ST1115C |
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Description similaire - ST1115C |
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