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APX9270NI-TRG Datasheet(PDF) 10 Page - Anpec Electronics Coropration |
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APX9270NI-TRG Datasheet(HTML) 10 Page - Anpec Electronics Coropration |
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10 / 17 page  Copyright © ANPEC Electronics Corp. Rev. A.3 - Jun., 2008 APX9270 www.anpec.com.tw 10 Function Description Lockup Protection and Automatic Restart Figure 1: Rotation Control Curve The APX9270 is designed with a variable speed control- ler which has two external input signals, a temperature signal sensed by a thermistor and an external PW M signal. Variable Speed Control Temperature Speed Control Using thermistor get temperature to make SET pin voltage. The fan’s speed is decided by comparing OSC and SET pin voltage. In addition, the lowest drive duty is set by comparing the OSC oscillating voltage and MIN pin voltage (only for temperature speed control side). Temperature control system works by comparing the voltage of SET and OSC. When SET voltage is lower than OSC voltage, one OUT pulled high and another OUT pulled low. On the contrary, when SET voltage is higher than OSC voltage, upper side transistors are OFF; meanwhile, the coil current re-circulates lower side transistor. Therefore, with decreasing SET voltage, the output ON-Duty will be increasing, which results in the increasing of the coil current and motor rotation speed. External PWM Speed Control This is a pin for the direct PWM speed control. PWM pin input is pulled down to GND when it is not used. The minimum duty is performed by R6 and R7 resistances (see Typical Application Circuit). R7 is left open if you want to stop rotation when PWM duty is 0%. (see Figure 1: Rotation Control Curve) T A Duty100% Duty 50% Duty 0% External PWM-Duty ) C ( o OUT-DUTY(%) the fan is locked. Connecting the capacitor from CT pin to GND determines the shutdown time and restart time. As the fan is locked, the charge/discharge circuit will charge the CT capacitor to 3.6V by a 2.2 µA source current for a locked detection time, and then the circuit will switch the capacitor to discharge. During the discharging interval, the output drivers are switched off until the CT voltage is discharged to 1.6V by a 0.22 µA sink current, and the circuit will switch the capacitor to charge. In the charging interval, the IC enters the restart time; one output is high and another is low, which makes a torque for fan rotation until the CT voltage is charged to 3.6V by a 2.2 µA source current. If the locked condition still remains, the charge/ discharge process will be recurred until the locked condition is released (see Figure 2: Lock/Auto Restart Waveform). Figure 2: Lock/Auto Restart Waveform Current Limit The APX9270 includes both internal and external current limiters. External current limiter value is programmed by R L which is located between VCC pin and VM pin. The external current limiter works when the voltage difference between both sides of R L raises to be 0.48V or higher. For example, the R L=0.5Ω, the external current limiter value is fixed and internally set at 960mA. The internal current limiter value is different in rotation mode and lock mode. It is 1.2A in rotation mode, but it decreases to 0.6A in lock mode. This feature can reduce power consump- tion while the fan is locked. In general application, it is The APX9270 provides the lockup protection and auto- matic restart functions to prevent the coil burnout while V IN+ V IN- Lock Lock Detection Release V OUT2 V OUT1 V CT V FG TOFF TOFF TON |
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