InnoSwitch3-CP
Cable Drop Compensation (CDC)
The amount of cable drop compensation is a function of the load with
respect to the constant current regulation threshold as illustrated in
Figure 9.
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Auto-Restart Thresholds
The OUTPUT VOLTAGE pin includes a comparator to detect when the
output voltage falls below VFB(AR) or VVOUT(AR), for a duration exceeding
tFB(AR) or tVOUT(AR)respectively. The secondary controller will relinquish
control when this fault condition is detected. This threshold is meant
to limit the range of constant current (CC) operation and is included
to support high power charger applications.
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SECONDARY BYPASS Pin Overvoltage Protection
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The InnoSwitch3-CP secondary controller features a SECONDARY
BYPASS pin OV feature similar to the PRIMARY BYPASS pin OV feature.
When the secondary is in control, in the event that the SECONDARY
BYPASS pin current exceeds IBPS(SD) (~7 mA) the secondary will send a
command to the primary to initiate an auto-restart off-time (tAR(OFF)) or
latch-off (see Secondary Fault Response in Feature Code Addendum).
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Figure 9. Cable Drop Compensation Characteristics.
During normal operation, the secondary will stop requesting pulses
from the primary to initiate an auto-restart cycle when the FEEDBACK
pin voltage falls below the VFB(OFF) threshold. The deglitch filter on the
protection mode is on for less than ~10 ms. By this mechanism, the
secondary will relinquish control after detecting that the FEEDBACK
pin is shorted to ground.
Output Constant Current and Constant Power Regulation
The InnoSwitch3-CP regulates the output current through an external
current sense resistor between the ISENSE and SECONDARY
GROUND pins and also controls output power in conjunction with the
output voltage sensed on the OUTPUT VOLTAGE pin. If constant
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Figure 10. Intelligent Quasi-Resonant Mode Switching.
7
Rev. D 08/18
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