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DIOO MICROCIRCUITS

DIO8850 Datasheet Preview

DIO8850 Datasheet

Single Stage Buck PFC Controller

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DIO8850
Single Stage Buck PFC Controller for LED Lighting
Rev 1.5
Features
Valley turn-on of the MOSFET to achieve low
switching losses
0.3V current sense reference voltage leads to
a lower sense resistance thus a lower
conduction loss
Low start up current: 15µA typical
Reliable short LED and Open LED protection
Power factor >0.9
Compact package: SOT23-6
Descriptions
The DIO8850 is a single stage Buck PFC controller
targeting at LED lighting applications. It drives the
Buck converter in the quasi-resonant mode to
achieve higher efficiency.
It keeps the Buck converter inconstant on time
operation to achieve high power factor.
Applications
LED Lighting
Down light
Tube lamp & PAR lamp &Bulb lamp
Block Diagram
www.dioo.com
© 2016 DIOO MICROCIRCUITS CO., LTD
DIO8850• Rev. 1.5




DIOO MICROCIRCUITS

DIO8850 Datasheet Preview

DIO8850 Datasheet

Single Stage Buck PFC Controller

No Preview Available !

DIO8850
Ordering Information
Order Part Number
DIO8850CST6
Top Marking
YW8A
Green
TA
-40 to +85°C
Package
SOT23-6
Tape & Reel, 3000
Pin Assignments
SOT23-6
Figure 2 Pin Assignment (Top View)
Pin Definitions
Pin Name
CS
GND
COMP
ZCS
VIN
DRV
NC
Description
Current sense pin. Connect this pin to the source of the primary switch. Connect the sense resistor
across the source of the primary switch and the GND pin.
(current sense resister Resistor: RS = 1 × Vref )
2 Iout
Also this pin used to detect transformer and secondary is short or not.
Ground pin
Loop compensation pin. Connect a RC network across this pin and ground to stabilize the control
loop.
Inductor current zero-crossing detection pin. This pin receives the auxiliary winding voltage by a
resister divider and detects the inductor current zero crossing point. This pin also provides over
voltage protection and line regulation modification function simultaneously. If the voltage on this pin
is above VZCS,OVP, the IC would enter overvoltage protection mode. Good line regulation can be
achieved by adjusting the upper resistor of the divider.
Power supply pin. This pin also provides output over voltage protection along with ZCS pin.
Gate driver pin. Connect this pin to the gate of primary MOSFET.
Not Connect.
www.dioo.com
© 2016 DIOO MICROCIRCUITS CO., LTD
DIO8850• Rev. 1.5


Part Number DIO8850
Description Single Stage Buck PFC Controller
Maker DIOO MICROCIRCUITS
Total Page 9 Pages
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