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NCP1215A
Low Cost Variable OFF Time Switched Mode Power Supply Controller
NCP1215A
Low Cost Variable OFF
Time Switched Mode Power
Supply Controller
The NCP1215Aisa controller for low power off- -line flyback
Switched Mode Power Supplies (SMPS) featuring low size, weight
and cost constraints together witha good low standby power
performance. The operating principle uses switching frequency
reductionat light loadby increasing the OFF Time. Also, when OFF
Time expands, the peak currentis gradually reduced downto
approximately 1/4of the maximum peak currentto prevent from
exciting the transformer mechanical resonances. The riskof acoustic
noiseis thus greatly diminished while keeping good standby power
performance. low power internal supply block also ensures very low current
consumptionat startup without hampering the standby power
performance. special primary current sensing technique minimizes the impact SMPS switching on controlIC operation. The choiceof peak
voltage across the current sense resistor allows dissipationtobe
further reduced. The negative current sensing technique offers
advantages overa traditional approachby avoiding the voltage drop
incurredby traditional MOSFET source sensing. Thus, theIC drive
capabilityis greatly improved.
Finally, the bulk input ripple ensuresa natural frequency dithering
which smooths the EMI signature.
Features Variable OFF Time Control Method Very Low Current Consumptionat Startup Natural Frequency Dithering for Improved EMI Signature Current Mode Control Operation Peak Current Compression Reduces Transformer Noise Programmable Current Sense Resistor Peak Voltage Undervoltage Lockout These are Pb- -Free Devices
Typical Applications Auxiliary Power Supply Standby Power Supply AC- -DC Adapter Off- -line Battery Charger
MARKING
DIAGRAM
FAC = Specific Device Code = Assembly Location = WaferLot = Year = Work Week = Pb- -Free Package
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SOIC--8 SUFFIX
CASE 751
1215A
ALYW
TSOP--6
(SOT23--6, SC59--6) SUFFIX
CASE 318G 1 8
(Top View)
PIN CONNECTIONS NCCT
GND Gate
VCC
SOIC--8 FBGND 4
Gate6
(Top View) VCC
TSOP--6
FACAYWG
ORDERING INFORMATION
(Note: Microdot maybein either location)
