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GENERAL DESCRIPTION
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controller MOSFET.
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Current mode PWM controller with integrated high voltage power MOSFET
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design wit h LY952 3/ LY952 5/LY 952 6/LY95 27/ LY95 28 . the IC operates in Extend ed
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‘burst mod e’ to minimize switching loss. Low
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Soft Start with 4mS,LY9523/LY 9 525/LY9 52 6/LY952 7/ LY952 8 offers complete
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Excellent EMI perfor
mance is achieve d wi th prop riet ary fre qu e ncy hufflin g echniqu e.
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frequ ency is
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LY952 3/L Y 952 5/LY95 26/LY95 27 /LY9528 o perat es in the fixed P WM freque ncy ,the
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FEATURES
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Integrate d high volta ge po wer MOSFET Low Vcc Startup Cu r rent( 5 μ A)
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Frequ ency shuffling for EMI
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UVLO an d Auto Self- Recover y Soft Start with 4mS Burst Mode
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Cycle- by- Cycle Ove r-curr ent limiting
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Ove r curre nt Protection(O CP),o ver voltag e Protection(OVP)
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“No Y-CAP ”system design in sub 20 W ra nge
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protection (OCP).L
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Y9 523/L Y9 52 5/L Y952 6/ LY952 7/L Y 952 8 is offered i
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clamp and unde r volt age lockou t (UVLO), ove r volta ge pr otection(O LP),o ver cur ren t
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protection cover age with autom atic self-reco ver y fea ture includ ing Vcc over volta ge
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current co ntribute to a reliable pow er on startup
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Vcc low startup cur r ent and lo w ope ratin g
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APPLICATIONS
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BLOCK DIAGRAM
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5V
Internal Bias
UVLO
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Drain
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LEB Soft Start
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Burst Mode
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Vth Slope Compensation PWM Compensation OCP
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PIN CONNECTION
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Delay 68mS
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GND Vcc FB
Grou nd
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Vcc-G
Power Su p ply special ly for Internal Gate Driver
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Pin Name
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PIN DESCRIPTIONS
Descriptions
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power supply pin
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6, 7, 8
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Name
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Adapting 6W 10W 20W 22W 24W
Openi ng 8W
Adapting 5W 8W 15W 20W
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14W 24W 28W 30W
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Unit V V
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7W 12W 20W 24W 28W
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190V ~ 2 60V
85V ~ 26 5V
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OUTPUT POWER TABLE
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ABSOLUTE MAXI
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MUM RATINGS (T a=25 ℃ )
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24W
Vcc-G Voltage
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LY952 3 LY952 5 LY952 6 LY952 7 LY952 8
ID ID ID ID ID
0.80 1.0 2.0 3.0 4.0 25
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A A A V V
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Power Supply V
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V VCC
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V F B Maximum Input Voltage
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-0.3 ~ 7.0
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Vcc zener clamp continuous current
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Drain In pu t Voltage
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Characteristics
Symbol V Drain
Value 650
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Current s ense input pin The Drain pin is designed to connect directly to the primary lead of the transformer and is capable of switching a ma ximu m of 650V
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Feedback input pin
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