DescriptionThe FSD146MRBN is an integrated Pulse Width Modulation (PWM) controller and SenseFET designed for offline Switch-Mode Power Supplies (SMPS) with minimal external components. The PWM controller includes an integrated fixed-frequency oscillator, Under Voltage Lockout (UVLO), Leading-Edge Blanking (LEB), optimized gate driver, internal soft-start, temperature compensated precise current sources for loop compensation, and self-protection circuitry. Compared with a discrete MOSFET and PWM controller solution, the FSD146MRBN can reduce total cost, component count, size, and weight; while simultaneously increasing efficiency, productivity, and system reliability. This device provides a basic platform that is well suited for cost-effective design of a flyback converter.

Features■ Advanced Soft Burst-Mode Operation for
Low Standby Power and Low Audible Noise
■ Random Frequency Fluctuation for Low EMI
■ Pulse-by-Pulse Current Limit
■ Various Protection Functions: Overload Protection
(OLP), Over-Voltage Protection (OVP), Abnormal
Over-Current Protection (AOCP), Internal Thermal
Shutdown (TSD) with Hysteresis, Output-Short
Protection (OSP), and Under-Voltage Lockout
(UVLO) with Hysteresis
■ Low Operating Current (0.4mA) in Burst Mode
■ Internal Startup Circuit
■ Internal High-Voltage SenseFET: 650V
■ Built-in Soft-Start: 15ms
■ Auto-Restart Mode

Applications■ Power Supply for LCD Monitor, STB, and DVD Combination

Manufacturer	onsemi
Product Category	AC DC Converters, Offline Switchers
Series	FPS™
Type	PWM Controller
Packaging	Tube
Unit-Weight	0.028769 oz
Mounting-Style	Through Hole
Operating-Temperature-Range	- 40 C to + 125 C
Package-Case	8-DIP (0.300", 7.62mm)
Operating-Temperature	-40°C ~ 125°C (TJ)
Mounting-Type	Through Hole
Supplier-Device-Package	8-PDIP
Watt	40W
Output-Isolation	Isolated
Internal-Switch-s	Yes
Voltage-Breakdown	650V
Topology	Flyback
Voltage-Start-Up	12V
Voltage-Supply-Vcc-Vdd	7.5 V ~ 23 V
Duty-Cycle	67%
Frequency-Switching	67kHz
Fault-Protection	Current Limiting, Over Load, Over Temperature, Over Voltage, Short Circuit
Control-Features	-
Maximum Operating Temperature	+ 125 C
Operating-Supply-Current	500 uA
Switching-Frequency	73 kHz
Package-Case	DIP-8