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TD310N 数据表(PDF) 4 Page - STMicroelectronics |
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TD310N 数据表(HTML) 4 Page - STMicroelectronics |
4 / 9 page UVLO/stbdy pin functionning modes Due to the wide supply voltage range of the TD310, the UVLO function (Under Voltage Lock Out) is externally adjustable by a resistor bridge. The bridge rate can be calculated in relation with the expected UVLO protection level as follows : VUVLO x R1 R1 +R2 = 1.2V (where R1 is the lower resistor of the bridge) The internal resistor sets the default UVLO value to 12V (*) and might influence the external bridge rate if the values of the external resistors are too high. The standby threshold value depends of the UVLO value as follows : Vstdby = 0.7⁄1.2 VUVLO Both UVLO and stdby functions can be inhibited by connecting the UVLO/stdby pin to VCC + via a pull up resistor (ex 150k Ω). The following table summarizes the functions of the TD310 : Pin 16 9/11 5 2/3/4 15/14 /13 6 7/8/10 Configuration UVLO/stdby Sense+/Sense- Enabl e In A/B/C Out A/B/C Alarm Op. Amp. Consumption Normal 1 H + > - XXL L OK H (1.5mA) +< - HIN IN H LX L Stdby 2 L +> - XXL L HZ L (30 µA) +< - H UVLO 3 M X X X L L OK H Configuration 1 : UVLO/stdby = H The TD310 is in a normal consumption state (1.5mA), the operational amplifier is normally functionning and the buffer outputs are determined by the sense comparator inputs, the enable inputs and the buffer inputs. Configuration 2 : UVLO/stdby = L The TD310 is in a low consumption state (standby mode 30 µA), the buffer outputs are set to low state and the operational amplifier is in high impedance state. Configuration 3 : UVLO/stdby = M The VCC supply voltage is between VUVLO and Vstdby (**). The TD310 remains in a normal consumption state and the operational amplifier is normally functionning but the buffer outputs and the alarm pin are set to low state. (*) If the UVLO level remains unadjusted, it is recommended to bypass the UVLO/stdby pin with a 1nF capacitor. (**) If the supply voltage falls below Vstdby, the TD310 is set in standby mode (configuration 2). TD310 4/9 |
类似零件编号 - TD310N |
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类似说明 - TD310N |
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