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Overview
| Topology | Flyback Converter |
| Input voltage | 90-265 V |
| Output 1 | 5 V / 2 A |
| IC revision | P0 |
Description
NCP4371 is a USB secondary side fast-charging controller, supporting Qualcomm Quick Charge™ 3.0 (QC 3.0) High Voltage Dedicated Charging Port (HVDCP) Class A and Class B specification. NCP4371 allows for selection of the output voltage of an AC-DC USB adapter based on commands from the Portable Device (PD) being powered. Selecting a higher charging voltage will reduce the charging current for a given power level resulting in reduced IR drops and increased system efficiency. Another advantage of QC3.0 is a decreased battery charging time and a reduced PD system cost thanks to the ability to select an optimum charging voltage. This eliminates the need for costly DC-DC converters within the PD. The USB-bus voltage can be controlled in discreet steps from 3.6V up to 20V. The output current is limited not to exceed maximum allowable power level. The NCP4371 resides at the secondary (isolated) side of the adapter. It includes voltage and current feedback regulation eliminating the need for a shunt regulator such as TL431. The NCP4371 provides charging current limits down to VBUS=2.2V protecting the portable device from excessive currents in case of a soft short-circuit condition. The NCP4371 integrates a safe-discharge circuitry to quickly and reliably discharge output capacitors in case the USB cable is unplugged or connected to a 5V only USB port.
Features
- Supports Qualcomm Quick Charge 3.0 HVDCP Class A/B
- Output Voltage Can be Configured in Discreet Steps from
- Class A: 3.6 V up to 12 V
- Class B: 3.6 V up to 20 V
- Compatible with USB Battery Charging Specification Revision 1.2(USB BC1.2)
- Constant Voltage and Constant Current Regulation
- Soft Short−Circuit Current Limitation Down to VBUS = 2.2 V
- Removes a Need for the Secondary Side Shunt Regulator such asTL431
- Output Capacitor Safe−Discharge Circuitry at Cable Unplug
- Fast Dynamic Response
- Built−in Power Limiting Function
- Low Supply Current
- Wide Operating Input Voltage Range: 2.2 V to 28 V
- This is Pb−free Device
Typical applications
- Tablets and Other Portable Devices
- Fast Charging AC/DC Adapters for Smart Phones
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IR(A) | ISAT,10%(A) | RDC max.(Ω) | fres(MHz) | Version | C | VR(V (DC)) | Endurance(h) | IRIPPLE(mA) | ILeak(µA) | DF(%) | Pitch(mm) | Ø D(mm) | L(mm) | Packaging | Interface Type | Type | Variant | Gender | Pins | Mount | Working Voltage(V (AC)) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-TI Radial Leaded Wire Wound Inductor, 1 µH, 8.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TI Radial Leaded Wire Wound Inductor | Inductance1 µH | Rated Current8.5 A | Saturation Current @ 10%8.5 A | DC Resistance0.015 Ω | Self Resonant Frequency140 MHz | VersionHeat Shrinking Tube | – | – | – | – | – | – | – | – | Length6 mm | – | – | – | – | – | – | MountTHT | – | ||||
| WE-TI Radial Leaded Wire Wound Inductor, 220 µH, 0.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TI Radial Leaded Wire Wound Inductor | Inductance220 µH | Rated Current0.5 A | Saturation Current @ 10%0.57 A | DC Resistance1.2 Ω | Self Resonant Frequency4.8 MHz | VersionHeat Shrinking Tube | – | – | – | – | – | – | – | – | Length6 mm | – | – | – | – | – | – | MountTHT | – | ||||
 | WCAP-PTG5 Aluminum Polymer Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-PTG5 Aluminum Polymer Capacitors | – | – | – | – | – | – | Capacitance330 µF | Rated Voltage16 V (DC) | Endurance 2000 | Ripple Current4500 mA | Leakage Current528 µA | Dissipation Factor8 % | Pitch3.5 mm | Diameter8 mm | Length8 mm | PackagingAmmopack | – | – | – | – | – | MountRadial THT | – | ||||
 | WR-USB Standard Connectors, –, 1.5 A | Simulation– | Downloads6 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-USB Standard Connectors | – | Rated Current1.5 A | – | – | – | – | – | – | – | – | – | – | – | – | – | PackagingTape and Reel & Mylar | Interface TypeType A | TypeHorizontal - Short Type | Variantwith Clips | GenderReceptacle | Pins4 | MountTHT | Working Voltage30 V (AC) | ||
750315544 | Offline Transformer, –, – | Simulation– | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Offline Transformer | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – |