ncp1397a ON Semiconductor, ncp1397a Datasheet - Page 21

• Manufacturer Part Number: ncp1397a
• Description: High Performance Resonant Mode Controller With Integrated High-voltage Drivers
• Manufacturer: ON Semiconductor

UVLO
Reset
+
Reset
VtimerOFF
VtimerON
Itimer1
DRIVING
LOGIC
+ -
VDD
1 = ok
0 = fault
Itimer2
SS
Vref(skip)
Figure 43. Fault Input Logic for NCP1397A
VDD
-
+
+
1 = ok
0 = fault
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discharge at VCC(on)/
restart if VFB < 0.3 V
21
Vref(fault)
+
-
Vref(OCP)
+
FB
-
+
Skip/Disable
+
SS(dis)
Ctimer
A
B
Fault
FB
A
B
Ctimer
Rtimer
Css
VCC
Skip
Average
Current
To Primary
Current Sensing
Circuitry
Input