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Updated at 17/06/2025 10:30:15(UTC+8)

Certifications

ManyChip is committed to product quality and safety with ISO 9001, ISO 13485, ISO 45001, UL, RoHS, CQC and REACH certifications.

Description

DESCRIPTION
The UCC28740 isolated-flyback power-supply controller provides Constant-Voltage (CV) using an optical coupler to improve transient response to large load steps. Constant-Current (CC) regulation is accomplished through Primary-side Regulation (PSR) techniques. This device processes information from opto-coupled feedback and an auxiliary flyback winding for precise high-performance control of
output voltage and current.
FEATURES
• Less than 10-mW No-Load Power Capability
• Opto-Coupled Feedback for CV, and Primary-Side Regulation (PSR) for CC
• Enables ±1% Voltage Regulation and ±5% Current Regulation Across Line and Load
• 700-V Startup Switch
• 100-kHz Maximum Switching Frequency Enables High-Power-Density Charger Designs
• Resonant-Ring Valley-Switching Operation for Highest Overall Efficiency
• Frequency Dithering to Ease EMI Compliance
• Clamped Gate-Drive Output for MOSFET
• Overvoltage, Low-Line, and Overcurrent Protection Functions
• SOIC-7 Package
APPLICATIONS
• USB-Compliant Adapters and Chargers for Consumer Electronics
– Smart Phones
– Tablet Computers
– Cameras
• Standby Supply for TV and Desktop
• White Goods

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UCC28740D Specifications

Attribute	Attribute Value

Datasheet	Datasheet
3D Model	3D Model
Mounting Style	Surface Mount
Number of Pins	7 Pin
Case/Package	SOIC-7
Frequency	100 kHz
Supply Voltage (DC)	9.00V (min)
Output Current	0.025 A
Supply Current	2.65 mA
Number of Positions	7 Position
Switching Frequency	170Hz ~ 100kHz
Topology	Flyback
Duty Cycle	99 %
Maximum Duty Cycle	99 %
Operating Temperature (Max)	125 ℃
Operating Temperature (Min)	-40 ℃
Supply Voltage (Max)	35 V
Supply Voltage (Min)	9 V
	Show
Size-Height	1.5 mm
Operating Temperature	-40℃ ~ 125℃ (TJ)
Product Lifecycle Status	Active
Packaging	Each
RoHS	RoHS Compliant
Lead-Free Status	Lead Free
REACH SVHC Compliance	No SVHC
REACH SVHC Compliance Edition	2015/06/15
ECCN Code	EAR99

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- Please confirm with the logistics company in advance for remote areas.
(Additional charges ($35-$50) may apply for delivery in these areas)
- Delivery date: usually 2 to 7 working days.
- A tracking number will be sent after your order ships.
- Carefully inspected and packed by ManyChip warehouse
- Vacuum packaging
- Anti-static packaging
- Shockproof foam
The terms here are for reference only, the actual terms are subject to the sales quotation.
- Please confirm product specifications when ordering.
- MOQ refers to the minimum order quantity required to purchase each part.
- If you have special ordering instructions, please indicate them on the ordering page.
- Inspection (PSI) will be performed prior to shipment.
- Income Quality Control (IQC), 1000+ qualified dealers.
- Chips are tested by authoritative organizations to ensure the quality, authenticity and safety of your device.
- Decapsulation control
- X-ray control
- XRF inspection
- Electrical testing
- Surface testing
-Digital components warehouse, covering an area of 800 square meters, with constant temperature and humidity

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SN:H1.9726LO31608V42Q0QC0S0

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