Electronic Components Datasheet Search |
|
NIS5132 Datasheet(PDF) 9 Page - ON Semiconductor |
|
NIS5132 Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 11 page NIS5132 Series http://onsemi.com 9 Undervoltage Lockout The undervoltage lockout circuit uses a comparator with hysteresis to monitor the input voltage. If the input voltage drops below the specified level, the output switch will be switched to a high impedance state. dv/dt Circuit The dv/dt circuit brings the output voltage up under a linear, controlled rate regardless of the load impedance characteristics. An internal ramp generator creates a linear ramp, and a control circuit forces the output voltage to follow that ramp, scaled by a factor. The default ramp time is approximately 2 ms. This can be modified by adding an external capacitor at the dv/dt pin. This pin includes an internal current source of approximately 85 nA. Since the current level is very low, it is important to use a ceramic cap or other low leakage capacitor. Aluminum electrolytic capacitors are not recommended for this circuit. The ramp time from 0 to the nominal output voltage can be determined by the following equation, where t is in seconds: t0*12 + 24e6 @ 50 pF ) Cext Cext + t0−12 24e6 * 50 pF Where: C is in Farads t is in seconds Any time that the unit shuts down due to a fault, enable shut−down, or recycling of input power, the timing capacitor will be discharged and the output voltage will ramp from 0 at turn on. Enable/Fault The Enable/Fault pin is a multi−function, bidirectional pin that can control the output of the chip as well as send information to other devices regarding the state of the chip. When this pin is low, the output of the fuse will be turned off. When this pin is high the output of the fuse will be turned−on. If a thermal fault occurs, this pin will be pulled low to an intermediate level by an internal circuit. To use as a simple enable pin, an open drain or open collector device should be connected to this pin. Due to its tri−state operation, it should not be connected to any type of logic with an internal pullup device. If the chip shuts down due to the die temperature reaching its thermal limit, this pin will be pulled down to an intermediate level. This signal can be monitored by an external circuit to communicate that a thermal shutdown has occurred. If this pin is tied to another device in this family (NIS5132 or NIS5135), a thermal shutdown of one device will cause both devices to disable their outputs. Both devices will turn on once the fault is removed for the auto−retry devices. For the latching thermal device, the outputs will be enabled after the enable pin has been pulled to ground with an external switch and then allowed to go high or after the input power has been recycled. For the auto retry devices, both devices will restart as soon as the die temperature of the device in shutdown has been reduced to the lower thermal limit. The thermal options are listed in the ordering table. Thermal Protection The NIS5132 includes an internal temperature sensing circuit that senses the temperature on the die of the power FET. If the temperature reaches 175 °C, the device will shut down, and remove power from the load. Output power can be restored by either recycling the input power or toggling the enable pin. Power will automatically be reapplied to the load for auto−retry devices once the die temperature has been reduced by 45 °C. The thermal limit has been set high intentionally, to increase the trip time during high power transient events. It is not recommended to operate this device above 150 °C for extended periods of time. Figure 19. Fault/Enable Signal Levels |
Similar Part No. - NIS5132_14 |
|
Similar Description - NIS5132_14 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |