UG-710
ADP1055-EVALZ User Guide
Rev. B | Page 16 of 43
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47
Figure 47. Voltage Line Feedforward;
Red Trace: Input Voltage 10 V/Div;
Green Trace: AC-Coupled Output Voltage;
Blue and Yellow Traces: OUTB and OUTC PWMs
IIN WINDOW
The
IIN
window sets up thresholds for the input current
thresholds, namely the IIN_FAST_OC_FAULT_LIMIT and the
IN_OC_FAULT_LIMIT. The corresponding faults can be set up
in the
Fault Response
window.
There are two ranges for the fast limit (1.2 V or 250 mV). Using
the board settings, in particular the current transformer (CT)
turns ratio, and termination resistor, the GUI calculates the
peak current at which the IIN_FAST_OC_FAULT_LIMIT
is triggered. This fault terminates the PWM pulse for the
remainder of the switching period depending upon the timeout
value (this is set in the
Additional Settings
bar).
For example, a timeout of four switching cycles causes the
IN_FAST_OC_FAULT flag to set when the
IIN_FAST_OC_FAULT_LIMIT threshold is crossed 4 times
consecutively.
This function can be bypassed using GPIO1 as shown in
Figure 48.
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9
Figure 48. Additional Settings of the IIN Window
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048
Figure 49. IIN Window
The IN_OC_FAULT is an accurate fault whose threshold can be
set simply by dragging and dropping the threshold bar or by
entering a value using the keyboard icon on the top right hand
corner of the screen. Changes take place immediately and are
stored in the RAM of the IC, but need to be saved to EEPROM
for permanent storage.
VOUT WINDOW
The VOUT window programs thresholds for the output voltage
set point, over voltage protection (OVP) and warning, and
under voltage protection (UVP) and warning.
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049
Figure 50. VOUT Window
