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ACT510X 데이터시트(PDF) 17 Page - Active-Semi, Inc |
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ACT510X 데이터시트(HTML) 17 Page - Active-Semi, Inc |
17 / 37 page ACT510x Rev 1.0, 04-Apr-2018 17 7. Protections 7.1. Thermal Shutdown The device has thermal shutdown to disable the converter when IC junction temperature exceeds TSHUT (160°C). The fault register TSD is set and latched when TSD fault is detected. The converter will restart automatically once the temperature of the DIE falls below the TSHUT_HYST value. During this time, however, the TSD indicator register may still be latched until it is read. 7.2. FET Over Current Protection The ACT510x closely monitors the HSFETs and LSFETs current for safe operation. If any FET exceeds the FET_ILIMIT value (8.5A or 10A), the FET will immediately be turned off for that cycle. If a FET detects the current limit for 8 continuous cycles, then the converter is latched off. This latch can be disabled by setting the DIS_OCP_SHUTDOWN Register. Once FET Overcurrent protection is latched, device must go back to the HIZ state to clear the Fault or set DIS_OCP_SHUTDOWN bit to 1. For example, EN pin must be toggled. 7.3. Watchdog Timer To ensure there is not system failure, a watchdog timer is included. The timeout is controlled by WATCHDOG[1:0] Register 0x01 [1:0[. The settings from 40sec to 160sec allow a wide range of timeout. It can also be disabled, such as for stand- alone operation with the WATCHDOG[1:0]=00. If the watchdog timer is enabled, the WATCHDOG_RESET needs to be written to a 1 before the timer times out. Note the WATCHDOG_RESET is an auto-clearing register. If it is written to 1, it will automatically reset back to 0. WATCHDOG is always disabled in HIZ Mode and cannot be enabled in HIZ. In addition, the reset counter is reset to 0 when entering HIZ mode and automatically restarted when exiting HIZ mode into regulation mode. 8. System ADC Monitor The ACT510x includes an A2D Converter to provide various system parameters during the modes of operation. The A2D Inputs are the following: Channel Channel Description ADC_CH_CONV[2:0] ADC_CH_READ[2:0] Value CH0 Output Current (OLIM) 000 000 IIN = (DOUT-2048)/(65000*RCS_IN) CH1 Output Voltage (VOUT) 001 001 VIN = 0.02035*(DOUT-2048) CH2 Input Current (ILIM) 010 010 IOUT = (DOUT-2048)/(65000*RCS_OUT) CH3 Input Voltage (VIN) 011 011 VOUT = 0.02035*(DOUT-2048) CH4 TH 100 100 VTH = 0.003053*(DOUT-2048) CH5 Die Temperature 101 101 TJ = 0.2707*DOUT - 809.49 CH6 ADC Input 110 110 VADC = 0.001527*(DOUT-2048) 9. PFM/PWM Operation At light load, ACT510x operates in the PFM (pulse skipping) mode to save the switching power loss. The PFM can be disabled by the register bit. |
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