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TC648 Datasheet(PDF) 7 Page - Microchip Technology |
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TC648 Datasheet(HTML) 7 Page - Microchip Technology |
7 / 28 page 2001-2012 Microchip Technology Inc. DS21448D-page 7 TC648 FIGURE 3-1: TC648 Nominal Operation. 4.0 SYSTEM BEHAVIOR The flowcharts describing the TC648’s behavioral algorithms are shown in Figure 4-1. They can be summarized as follows: 4.1 Power-Up (1) Assuming the device is not being held in shut- down or auto-shutdown mode (VIN > VAS).......... (2) Turn VOUT output on for 32 cycles of the PWM clock. This ensures that the fan will start from a dead stop. (3) Branch to Normal Operation. (4) End. 4.2 Normal Operation Normal Operation is an endless loop which may only be exited by entering shutdown or auto-shutdown mode. The loop can be thought of as executing at the frequency of the oscillator and PWM. (1) Drive VOUT to a duty cycle proportional to VIN on a cycle by cycle basis. (2) If an over-temperature fault occurs, (VIN > VOTF), activate OTF; release OTF when VIN < VOTF. (3) Is the TC648 in shutdown or auto-shutdown mode? If so..... a. VOUT duty cycle goes to zero. b. OTF is disabled. c. Exit the loop and wait for VIN > (VAS + VHAS), then execute Power-up sequence. (4) End. 2.6V VAS + VHAS VIN tRESET VREL VSHDN VAS 1.2V TC646 Status Normal Operation Auto-Shutdown Mode Normal Operation Shut- Down Normal Operation GND Time TEMP. HI LO |
Similar Part No. - TC648_13 |
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Similar Description - TC648_13 |
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