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ST1115C 데이터시트(PDF) 10 Page - Silicon Touch Technology Inc. |
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ST1115C 데이터시트(HTML) 10 Page - Silicon Touch Technology Inc. |
10 / 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 :9 4.Operating as a pre-driver ―Refer to Figure 6. (1) When a large fan is used, the driving current may be too large for ST1115 directly driving the fan. In this case, ST1115 may operate as a pre-driver, as illustrated in Fig. 6. Q1 and Q2 are PNP BJT, working as driving switches. The fan speed is controlled via the VT terminal, which can be connected to a thermistor-resistor divider or a PWM generator. VSS VSS VSS VSS VSS R4 R3 Q2 Q1 R2 R1 O2 O1 VT IC Hall ST1115C C1 RD Digital Power GND Hin VT CF C2 Analog Power D1 RD VDD Figure 6. ST1115 operates as a pre-driver. |
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