Order Part Number
-40 to +85°C
Tape & Reel, 3000
Figure 2 Pin Assignment (Top View)
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 )
Also this pin used to detect transformer and secondary is short or not.
Loop compensation pin. Connect a RC network across this pin and ground to stabilize the control
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.
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DIO8850• Rev. 1.5