Datasheet AP22652, AP22653, AP22652A, AP22653A (Diodes) - 9
| Manufacturer | Diodes |
| Description | Precision Adjustable Current-Limited Power Switches |
| Pages / Page | 17 / 9 — AP22652/AP22653/AP22652A/AP22653A. Application Information. Protection … |
| File Format / Size | PDF / 1.1 Mb |
| Document Language | English |
AP22652/AP22653/AP22652A/AP22653A. Application Information. Protection Features Under-Voltage Lockout (UVLO)
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AP22652/AP22653/AP22652A/AP22653A Application Information
The AP22652/52A and AP22653/53A are integrated high-side power switches optimized for Universal Serial Bus (USB) that require protection functions. The power switches are equipped with a driver that controls the gate voltage and incorporates slew-rate limitation. This, along with the various protection features and special functions, makes these power switches ideal for hot-swap or hot-plug applications.
Protection Features Under-Voltage Lockout (UVLO)
Whenever the input voltage falls below UVLO threshold (~2.5V), the power switch is turned off. This facilitates the design of hot-insertion systems where it is not possible to turn off the power switch before input power is removed.
Over-Current and Short-Circuit Protection
An internal sensing FET is employed to check for over-current conditions. Unlike current-sense resistors, sense FETs do not increase the series resistance of the current path. When an overcurrent condition is detected, AP22652 and AP22653 maintain a constant output current and reduce the output voltage accordingly. Complete shutdown occurs only if the fault stays long enough to activate thermal limiting. For AP22652A/53A, when an overcurrent condition is detected, the devices will limit the current until the overload condition is removed or the internal deglitch time (6ms typical) is reached, and AP22652A/53A will be turned off. AP22652A/53A will remain latched off until power is cycled or the device enable is toggled. The different overload conditions and the corresponding response of the AP22652/52A and AP22653/53A are outlined below:
NO. Conditions Explanation Behavior of the AP22652 and AP22653
Output is shorted before input Short-circuit condition at The IC senses the short circuit and immediately clamps output 1 voltage is applied or before the start-up current to a certain safe level namely ISHORT. part is enabled. At the instance the overload occurs, higher current may flow for a very short period of time before the current limit function Short-Circuit or Overload Short-circuit or overcurrent can react. 2 condition that occurs when the condition After the current limit function has tripped (reached the over- part is enabled. current trip threshold), the device switches into current limiting mode and the current is clamped at ISHORT/ILIMIT. Gradual increase from The current rises until ILIMIT or thermal limit. Once the threshold Load increases gradually until the 3 nominal operating current has been reached, the device switches into its current limiting current-limit threshold. (ITRIG) to ILIMIT mode and is set at ILIMIT.
NO. Conditions Explanation Behavior of the AP22652A/53A
The IC senses the short circuit and immediately clamps output Output is shorted before input Short-circuit condition at current to a certain safe level namely ISHORT. When the internal 1 voltage is applied or before the start-up deglitch time (6ms typical) is reached and the devices will be part is enabled turned off. At the instance the overload occurs, higher current may flow for a very short period of time before the current limit function can react. Short-Circuit or Overload Short-circuit or overcurrent After the current limit function has tripped (reached the over- 2 condition that occurs when the condition current trip threshold), the device switches into current limiting part is enabled. mode and the current is clamped at ISHORT/ILIMIT. When the internal deglitch time (6ms typical) is reached and the devices will be turned off. The current rises until ILIMIT or thermal limit. Once the threshold Gradual increase from Load increases gradually until has been reached, the device switches into its current limiting 3 nominal operating current to the current-limit threshold.(ITRIG) mode and is set at ILIMIT. When the internal deglitch time (6ms ILIMIT typical) is reached and the devices will be turned off. AP22652/AP22653/AP22652A/AP22653A 9 of 17 July 2020 Document number: DS41186 Rev. 2 - 2
www.diodes.com
© Diodes Incorporated
The AP22652/52A and AP22653/53A are integrated high-side power switches optimized for Universal Serial Bus (USB) that require protection functions. The power switches are equipped with a driver that controls the gate voltage and incorporates slew-rate limitation. This, along with the various protection features and special functions, makes these power switches ideal for hot-swap or hot-plug applications.
Protection Features Under-Voltage Lockout (UVLO)
Whenever the input voltage falls below UVLO threshold (~2.5V), the power switch is turned off. This facilitates the design of hot-insertion systems where it is not possible to turn off the power switch before input power is removed.
Over-Current and Short-Circuit Protection
An internal sensing FET is employed to check for over-current conditions. Unlike current-sense resistors, sense FETs do not increase the series resistance of the current path. When an overcurrent condition is detected, AP22652 and AP22653 maintain a constant output current and reduce the output voltage accordingly. Complete shutdown occurs only if the fault stays long enough to activate thermal limiting. For AP22652A/53A, when an overcurrent condition is detected, the devices will limit the current until the overload condition is removed or the internal deglitch time (6ms typical) is reached, and AP22652A/53A will be turned off. AP22652A/53A will remain latched off until power is cycled or the device enable is toggled. The different overload conditions and the corresponding response of the AP22652/52A and AP22653/53A are outlined below:
NO. Conditions Explanation Behavior of the AP22652 and AP22653
Output is shorted before input Short-circuit condition at The IC senses the short circuit and immediately clamps output 1 voltage is applied or before the start-up current to a certain safe level namely ISHORT. part is enabled. At the instance the overload occurs, higher current may flow for a very short period of time before the current limit function Short-Circuit or Overload Short-circuit or overcurrent can react. 2 condition that occurs when the condition After the current limit function has tripped (reached the over- part is enabled. current trip threshold), the device switches into current limiting mode and the current is clamped at ISHORT/ILIMIT. Gradual increase from The current rises until ILIMIT or thermal limit. Once the threshold Load increases gradually until the 3 nominal operating current has been reached, the device switches into its current limiting current-limit threshold. (ITRIG) to ILIMIT mode and is set at ILIMIT.
NO. Conditions Explanation Behavior of the AP22652A/53A
The IC senses the short circuit and immediately clamps output Output is shorted before input Short-circuit condition at current to a certain safe level namely ISHORT. When the internal 1 voltage is applied or before the start-up deglitch time (6ms typical) is reached and the devices will be part is enabled turned off. At the instance the overload occurs, higher current may flow for a very short period of time before the current limit function can react. Short-Circuit or Overload Short-circuit or overcurrent After the current limit function has tripped (reached the over- 2 condition that occurs when the condition current trip threshold), the device switches into current limiting part is enabled. mode and the current is clamped at ISHORT/ILIMIT. When the internal deglitch time (6ms typical) is reached and the devices will be turned off. The current rises until ILIMIT or thermal limit. Once the threshold Gradual increase from Load increases gradually until has been reached, the device switches into its current limiting 3 nominal operating current to the current-limit threshold.(ITRIG) mode and is set at ILIMIT. When the internal deglitch time (6ms ILIMIT typical) is reached and the devices will be turned off. AP22652/AP22653/AP22652A/AP22653A 9 of 17 July 2020 Document number: DS41186 Rev. 2 - 2
www.diodes.com
© Diodes Incorporated
