FSQ311

Switching Frequency :
Duty Cycle (Max) :
Number of Outputs : 1
Mounting Style : Through Hole
Operating Supply Current : 3 mA
Maximum Operating Temperature : + 85 C
Fall Time : 42 ns
Package / Case : PDIP-8
Rise Time : 19 ns
Operating Supply Voltage : 20 V


Features:

·Optimized for Valley Switching (VSC)
·Low EMI through Variable Frequency Control and
Inherent Frequency Modulation
·High-Efficiency through Minimum Voltage Switching
·Narrow Frequency Variation Range over Wide Load
and Input Voltage Variation
·Advanced Burst-Mode Operation for Low Standby
Power Consumption
·Pulse-by-Pulse Current Limit
·Various Protection Functions: Overload Protection
(OLP), Over-Voltage Protection (OVP), Abnormal
Over-Current Protection (AOCP), Internal Thermal
Shutdown (TSD)
·Under-Voltage Lockout (UVLO) with Hysteresis
·Internal Start-up Circuit
·Internal High-Voltage SenseFET (650V)
·Built-in Soft-Start (15ms)




Application

·Power Supply for DVP Player and DVD Recorder, Set-Top Box
·Adapter
·Auxiliary Power Supply for PC, LCD TV, and PDP TV




Pinout






Specifications

Product	Product status	Eco Status	Pricing*	Package type	Leads	Packing method	Package Drawing	Package Marking Convention**
FSQ311	Full Production	RoHS Compliant	$0.67	DIP	8	RAIL		Line 1: Q311 Line 2: &E&E&Z&3
FSQ311L	Full Production	RoHS Compliant	$0.67	SOP	8	RAIL	TBD	Line 1: Q311 Line 2: &E&E&Z&3

* Fairchild 1,000 piece Budgetary Pricing

** A sample button will appear if the part is available through Fairchild's on-line samples program. If there is no sample button, please contact a Fairchild distributor to obtain samples

Package marking information for product FSQ311 is available. Click here for more information .

Symbol	Characteristic		Min	Max.	Unit
VSTR	Vstr Pin Voltage		500		V
VDS	Drain Pin Voltage		650		V
VCC	Supply Voltage			20	V
VFB	Feedback Voltage Range		-0.3	9.0	V
Vsync	Sync Pin Voltage Range		-0.3	9.0	V
IDM	Drain Current Pulsed(6)	FSQ0365		12	A
		FSQ0265		8	A
		FSQ0165		4	A
		FSQ321/311		1.5	A
EAS	Single Pulsed Avalanche Energy(7)	FSQ0365		230	mJ
		FSQ0265		140	mJ
		FSQ0165		50	mJ
		FSQ321/311		10	mJ
PD	Total Power Dissipation			1.5	W
TJ	Recommended Operating Junction Temperature		-40	Internally limited	°C
TA	Operating Ambient Temperature		-40	85	°C
TSTG	Storage Temperature		-55	150	°C
ESD	Human Body Model(8)		CLASS1 C
	Machine Model(8)		CLASS B

Notes:
6. Repetitive rating: Pulse width limited by maximum junction temperature.
7. L=51mH, starting T_J=25°C.
8. Meets JEDEC standards JESD22-A114 and JESD22-A115.




Description

A Valley Switching Converter FSQ-series generally shows lower EMIand higher power conversion efficiency than aconventional hard-switched converter with a fixedswitching frequency. The FSQ-series is an integratedPulse-Width Modulation (PWM) controller andSenseFET specifically designed for valley switchingoperation with minimal external components. The PWMcontroller of FSQ-series includes an integrated fixed-frequencyoscillator, Under-Voltage Lockout, Leading EdgeBlanking (LEB), optimized gate driver, internal soft-start,temperature-compensated precise current sources forloop compensation, and self-protection circuitry.

Compared with discrete MOSFET and PWM controllersolutions, the FSQ-series reduces total cost, componentcount, size and weight; while simultaneously increasingefficiency, productivity, and system reliability. This deviceprovides a basic platform that is well suited for cost-effectivedesigns of valley switching fly-back converters.

Parameters:

Technical/Catalog Information	FSQ311
Vendor	Fairchild Semiconductor
Category	Integrated Circuits (ICs)
PWM Type	Current Mode
Number of Outputs	1
Package / Case	8-DIP
Packaging	Tube
Duty Cycle	-
Voltage - Supply	20V
Frequency-Max	95.2kHz
Buck	No
Boost	No
Flyback	Yes
Inverting	No
Doubler	No
Divider	No
Cuk	No
Isolated	Yes
Drawing Number	*
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	FSQ311 FSQ311