参数资料
| 型号： | NCP374MU075TXG |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | IC CTLR OVP POS/NEG 30V 12TLLGA |
| 标准包装： | 3,000 |
| 技术： | 混合技术 |
| 电路数： | 1 |
| 应用： | 通用 |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
NCP374
TYPICAL OPERATING CHARACTERISTICS
Operation
The NCP374 acts 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). Due to a back to back
architecture, the Vbus pin is also protected against reverse
polarity connection, coming from wrong USB cables. This
negative protection a cts 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 NCP374 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 TBD), 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
Over ? Current Protection (OCP)
This device integrates over current protection function,
from IN to Vbus port.
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
the accuracy. So a division by more than three times with
Rlim will degrade drastically the overcurrent accuracy.
The current limit calculation formula for the
NCP374MU075TXG is:
Rlim( W ) + 22150 Iocp * 29035
During over current event, NMOSes are opened and
FLAG output is tied to low, allowing the m Controller to take
into account the fault event and then disable reverse charge
path.
VBus Mode
To access to the Vbus mode, DIR pin must be tied to high
(>1.2) and EN must be tied from high to low (< 0.4 V).
In that case, the core of the NCP374 will be supplied by
the IN, with a 2.5 V minimum voltage and 5.5V maximum
voltage.
In this state, OCP, OVLO and thermal modes are
available.
immunity to transient conditions .
http://onsemi.com
7
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