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STBB1XX bảng dữ liệu(PDF) 10 Page - STMicroelectronics |
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10 / 20 page Detailed description STBB1xx 10/20 6.3 External synchronization The STBB1 implements external synchronization pin. If and external clock signal is applied to the MODE (SYN) pin with a frequency between 1.35 MHz and 2.0 MHz and with proper low/high levels, the device automatically goes in PWM mode and the external clock is used as switching oscillator. 6.4 Enable pin The device operates when EN pin is set high. If EN pin is set low the device stops switching, all the internal blocks are turned off. In this condition the current drawn from VIN/VINA is below 1 µA in the whole temperature range. In addition the internal switches are in off state so the load is electrically disconnected from the input, this avoids unwanted current leakage from the input to the load. 6.5 Protections The STBB1 implements different type of protections. 6.5.1 Soft start and short circuit After the EN pin is pulled high, or after a suitable voltage is applied to VIN, VINA and EN the device initiates the start-up phase. The average current limit is set to 400 mA at the beginning and it is gradually increased tracking the output voltage increase. As soon the output voltage reaches 1.0 V the average current limit is set to its nominal value. This method allows having a current limit proportional to the output voltage, if there is a short in the VOUT pin, the output current will not exceed 400 mA. This process is not handled by any timer so the device is also able to start-up in case of large capacitive loads. 6.5.2 Under voltage lockout The under voltage lockout function avoids improper operation of STBB1 when the input voltage is not high enough. When the input voltage is below the VUVLO threshold the device is in shutdown mode. The hysteresis of 100 mV avoids unstable operation when the input voltage is close to the UVLO threshold. 6.5.3 Over-temperature protection An internal temperature sensor continuously monitors the IC junction temperature. If the IC temperature exceeds 140 °C typically the device stops operating. As soon the temperature falls below 120 °C typically normal operation is restored. |
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