DescriptionThe advanced PWM controller, FAN501, simplifies isolated power supply design that requires CC regulation of the output. The output current is precisely estimated with only the information in the primary side of the transformer and controlled with an internal compensation circuit, removing the output current-sensing loss and eliminating external CC control circuitry. With an extremely low operating current (250 µA), Burst Mode maximizes light-load efficiency, allowing conformance to worldwide Standby Mode efficiency guidelines.

Features■ WSaver® Technology Provides Ultra-Low Standby Power Consumption for Energy Star’s 5-Star Level (<30 mW)
■ Constant-Current (CC) Control without Secondary-Side Feedback Circuitry for Discontinuous Conduction Mode (DCM) and Continuous Conduction Mode (CCM)
■ Dual-Frequency Function Changes Switching Frequency (140 kHz / 85 kHz) According to Input Voltage to Maximize Transformer Utilization and Improve Efficiency
■ High Power Density and High Conversion Efficiency with CCM Operation in Typical 10 W to15 W Compact Charger Applications
■ Frequency Hopping to Reduce EMI Noise
■ High-Voltage Startup
■ Precise Maximum Output Power Limit by CC Regulation through External Resistor Adjustment
■ Peak-Current-Mode Control with Slope Compensation to Avoid Sub-Harmonic Oscillation
■ Programmable Over-Temperature Protection with Latch Mode through External NTC Resistor
■ VS Over-Voltage Protection with Latch Mode
■ VS Under-Voltage Protection with Auto-Restart
■ VDD Over-Voltage-Protection with Auto-Restart
■ Available in MLP 4 X 3 Package

Applications■ Battery Chargers for Smart Phones, Feature Phones, and Tablet PCs
■ AC-DC Adapters for Portable Devices or Battery Chargers that Require CV / CC Control

Manufacturer	onsemi
Product Category	AC DC Converters, Offline Switchers
Series	WSaverR
Product	Flyback Controllers
Packaging	Alternate Packaging
Unit-Weight	0.000717 oz
Mounting-Style	SMD/SMT
Package-Case	10-WQFN Exposed Pad
Operating-Temperature	-40°C ~ 125°C (TA)
Mounting-Type	Surface Mount
Supplier-Device-Package	10-MLP (4x3)
Watt	-
Number-of-Outputs	1 Output
Output-Isolation	Isolated
Internal-Switch-s	No
Voltage-Breakdown	-
Topology	Flyback
Voltage-Start-Up	17.5V
Voltage-Supply-Vcc-Vdd	5.8 V ~ 30 V
Duty-Cycle	68.50%
Frequency-Switching	85kHz ~ 140kHz
Fault-Protection	Current Limiting, Over Temperature, Over Voltage
Control-Features	-
Shutdown	Yes
Isolation	Non-Isolated
Maximum Operating Temperature	+ 125 C
Operating temperature range	- 40 C
Operating-Supply-Voltage	15 V
Output-Voltage	1.5 V
Operating-Supply-Current	3.5 mA
Input-Voltage	6 V
Switching-Frequency	140 kHz
Package-Case	MLP-10
Duty-Cycle-Max	77 %