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FAN5645MPX Datenblatt(PDF) 6 Page - Fairchild Semiconductor |
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FAN5645MPX Datenblatt(HTML) 6 Page - Fairchild Semiconductor |
6 / 10 page © 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5645 • Rev. 1.0.0 6 RESET and FOLLOW Modes Reset mode consists of two control pulses, then CTRL goes LOW for longer than TTIMEOUT. The IC clears all training registers to zero, then enters STOP (SLEEP) mode. TCPHIGH TCPLOW TTIMEOUT CTRL Figure 7. RESET Mode After the IC goes through RESET mode; if CTRL goes HIGH again for longer than TDLY, the IC begins Follow mode, which causes the LED to be turned ON when CTRL is HIGH. The IC delays turning on the LED after the rising edge of CTRL by TDLY to determine whether the CTRL rising edge is to be interpreted as a command to turn the LED ON or the beginning of a new set of control pulses. When the CTRL signal goes LOW, LED current is turned off and the IC enters STOP (SLEEP) mode. A TCMD2 waiting period, after the last trailing edge of the CTRL input, is necessary before a new command can be received and processed. Note that FOLLOW mode can be entered upon power up as well, because all registers are cleared on power up and the device acts as if in RESET mode. TDLY CTRL LED Figure 8. FOLLOW Mode Timing Symbol Description Min. Typ. Max. Units TCMD1 Maximum time window in which starting control pulses must be finished 0.8 ms TFTPR Time window from first control pulse rising edge to first rising edge of training pulse 1.5 1.7 ms TCMD2 Maximum time window in which ending control pulses must be finished 0.85 ms TTIMEOUT Minimum time window CTRL line has to stay LOW after control pulses to enter and finish RESET mode (starting from the first rising edge of the control pulse) 4.0 ms TDLY Time delay in playback or follow mode b/t rising edge of CTRL line to when LED turns ON for the first time 0.95 1.10 1.45 ms TCPHIGH Control pulse HIGH width 2 55 μs TCPLOW Control pulse LOW width 2 μs TON1 LED ON time in Run modes 1.0 255.0 ms TOFF1 LED OFF time in Run modes 10 2550 ms TRESTART Over-temperature or over-current fault time in Follow mode 10 ms Over-Current, Over-Temperature, and Under-Voltage Faults An over-current fault occurs if the ISET pin is shorted to GND or the RSET resistor value is too low. If the resulting LED current is greater than three times the maximum programmed output current (60mA), the IC shuts down its output current and disables the reference voltage developed on the ISET pin. An over-temperature fault occurs when the IC exceeds 150°C, which also causes the IC to shut down its output current and disable the reference voltage developed on the ISET pin until the IC cools by about 20°C. If either fault occurs, the IC turns off the output LED current and disables the reference voltage developed on the ISET pin. If a short-circuit or over-temperature fault occurs during playback modes, playback is retried when the next playback pulse (TON) comes. If a short- circuit or over-temperature fault occurs during Follow mode, the LED turns off for TRESTART, then Follow mode tries to resume the LED current according to the current state of the CTRL line. If an under-voltage fault occurs, the IC turns off the LED and enters SLEEP mode until the next control pulse comes, at which point the IC tries to wake up. |
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