Datasheet InnoSwitch3-CE (Power Integrations) - 7

InnoSwitch3-CE Cable Drop Compensation (CDC)
The amount of cable drop compensation is a function of the load with X × VFB respect to the constant current regulation threshold as il ustrated in Figure 8. Cable Drop
Auto-Restart Thresholds
Compensation The FEEDBACK pin includes a comparator to detect when the output
Voltage
voltage fal s below V of V , for a duration exceeding t . The FB(AR) FB FB(AR) VFB secondary control er will relinquish control when this fault condition is
FEEDBACK Pin
sensed. This threshold is meant to limit the range of constant current (CC) operation.
SECONDARY BYPASS Pin Overvoltage Protection
No-Load Onset of CC
Load Current
Regulation The InnoSwitch3-CE secondary control er features a SECONDARY BYPASS pin OV feature similar to the PRIMARY BYPASS pin OV PI-8035-072516 feature. When the secondary is in control: in the event the SECONDARY BYPASS pin current exceeds I (~7 mA) the Figure 8. Cable Drop Compensation Characteristics. BPS(SD) secondary will send a command to the primary to initiate an auto-restart off-time (t ) or latch-off event (see Secondary Fault AR(OFF) During normal operation, the secondary will stop requesting pulses Response in Feature Code Addendum). from the primary to initiate an auto-restart cycle when the FEEDBACK
Output Constant Current
pin voltage fal s below the V threshold. The deglitch filter on the FB(OFF) The InnoSwitch3-CE regulates the output current through an external protection mode is on for less than ~10 ms. By this mechanism, the current sense resistor between the ISENSE and SECONDARY secondary will relinquish control after detecting that the FEEDBACK GROUND pins where the voltage generated across the resistor is pin is shorted to ground. compared to an internal reference of I (~35 mV). If constant SV(TH) current regulation is not required, the ISENSE pin must be tied to SECONDARY GROUND pin. -8147-102816 Request Window PI Output Voltage
FORWARD Pin Voltage Time Primary VDS Time
Figure 9. Intelligent Quasi-Resonant Mode Switching.
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Rev. D 08/18 www.power.com Document Outline Product Highlights Description Output Power Table Pin Functional Description InnoSwitch3-CE Functional Description Primary Controller Secondary Controller Applications Example Key Application Considerations Selection of Components Recommendations for Circuit Board Layout Layout Example Quick Design Checklist Absolute Maximum Ratings Thermal Resistance Key Electrical Characteristics Typical Performance Curves InSOP-24D Package Drawing InSOP-24D Package Marking Part Ordering Table MSL Table ESD and Latch-Up Table Part Ordering Information