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NCP373MU04TXG Datasheet(PDF) 6 Page - ON Semiconductor |
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NCP373MU04TXG Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 10 page NCP373 http://onsemi.com 6 ELECTRICAL CHARACTERISTICS Min / Max limits values (−40°C < TA < +85°C) and IN = +5 V (Unless otherwise noted). Typical values are TA = +25°C Characteristics Unit Max Typ Min Conditions Symbols TIMINGS Vbus MODE Vbus Disable time TVbusDIS From EN = 0.4 V to 1.2 V, to Vbus < 0.3 V. IN = 5 V 2.5 ms Turn off delay toff From IN > OVLO to Vbus ≤ 0.3 V Vin increasing from 5 V to 8 V at 3 V/ms 1.5 5 ms CHARGING MODE Start Up Delay ton From Vbus > UVLO to IN = 0.3 V , charging mode 15 30 45 ms FLAG going up Delay tstart From IN>0.3V to FLAG = 1.2 V 15 30 45 ms Turn off delay toff From Vbus > OVLO to IN ≤ 0.3 V Vin increasing from 5 V to 8V at 3V/ms 1.5 5 ms Alert delay tstop From Vbus > OVLO to FLAG ≤ 0.4 V See Figures 3and 9 Vin increasing from 5 V to 8 V at 3 V/ms 1.5 ms Disable time tdis EN = 1.2 V, From DIR = 0.4 to 1.2 V to IN ≤ 0.3 V 2.5 ms NOTE: Electrical parameters are guaranteed by correlation across the full range of temperature. TYPICAL OPERATING CHARACTERISTICS Operation The NCP373acts as an over−voltage in charge mode, when wall adapter or Vbus cable is connected to Vbus pin of the device. The downstream system (transceiver, CCCV charger..) are protected up to +30 V if charging voltage exceeds OVLO threshold (5.77 V). Thanks to a back to back architecture, the Vbus pin is also protected against reverse polarity connection, coming from wrong USB cables. This negative protection acts down to −30 V. In disable mode ( EN = 1, DIR = 1), there is no current consumption on IN pin and MSOFETs are turned off (Vbus cable disconnected) The NCP373 provides over−current from IN to Vbus by selecting Vbus mode. To active Vbus mode (USB port on), the EN pin must be tied low. In this case, MOSFET are turned on and current is measure in the branch. If the sinking current on the Vbus pin is above the programmed current on Ilim pin (can be programmed up to 400 mA), the Vbus current is regulated around Iocp during treg time. If the overload is present at the end of this timer, the MOSFET are turned off and automatic rearming cycle is activated. With Treg/Trrd cycle until overload is present. Over−voltage Lockout (OVLO) To protect the connected system on IN pins, from external over−voltage coming from USB connector or Wall Adapter, through Vbus pin , the device has a built−in over−voltage lock out (OVLO) circuit. During over−voltage condition, the output remains disabled until the input voltage exceeds OVLO (Vbus pin). The OVLO comparator is available in all modes. Additional OVLO thresholds ranging from OVLO can be manufactured. Please contact your ON Semiconductor representative for further information. FLAG output is tied to low until Vin is higher than OVLO. This circuit has a built−in hysteresis to provide noise immunity to transient conditions. Over−Current protection (OCP) This device integrates over current protection function, from IN to Vbus port (400 mA version and 1300 mA version). That means the current across the internal NMOS is regulated when the value, set by external Rlim resistor, exceeds Ilimit during an internal timer. An internal resistor is placed in series with the pin allowing to have a maximum OCP value when I lim pin is directly connected to GND. By adding external resistors in series with I lim and GND, the OCP value is decreased. The Rlim tolerance is important to keep a good accuracy. So a value between 0.1% and 1% won’t have an impact on the OCP accuracy. Nevertheless, the higher Rlim value, the lower Over current protection accuracy. Indeed, the current is measured by a voltage comparator on a serial resistance. If this voltage drop comes very small, the offset of the internal comparator will have an impact on |
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