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NCP1205 Datasheet(PDF) 13 Page - ON Semiconductor

Part # NCP1205
Description  Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1205 Datasheet(HTML) 13 Page - ON Semiconductor

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NCP1205
http://onsemi.com
13
Figure 15. This Typical Arrangement Allows for an Easy Fault Detection Management
+
V(–)
Ri
50 k
+
+
+
+
2R
R
OCP
Circuitry
Current
Setpoint
Vfb
Vlow
1.5 V
Vfb
V1
2.5 V
VHIGH = 3 V
VLOW = 5 mV
1
2
3
5
6
7
Rf
150 k
Monitor
To illustrate how the system reacts to a variable FB level,
we have entered the above circuit into a SPICE simulator
and observed the output waveforms. When FB is within
regulation, the error flag is low. However, as soon as FB
leaves its normal operating area, the OPAMP can no longer
keep the V(–) point and either goes to the positive top or
down to zero: the error flag goes high.
Because of the large amount of delay necessary for this
128 ms operation, the capacitor used for the timing is Ct,
connected from ground to pin 5. In normal VFM operation,
this timing capacitor serves as the VCO capacitor and the
error management circuit is transparent. As soon as an error
is detected (error flag goes high), an internal switch routes
Ct to the 128 ms generator. As a first effect, the switching
frequency is no longer controlled by the VCO (if the error
appears during VFM) and the system is relaxed to natural
BCM. The capacitor now ramps up and down to be further
divided and finally create the 128 ms delay.
Figure 16. By Monitoring the Internal Virtual Ground, the System can Detect the Presence of a Fault
Regulation Area
OCP Condition
Error Flag
Virtual Point
FB
1.5 V
1.000 M
3.000 M
5.000 M
7.000 M
9.000 M
6.500
4.500
2.500
500.0 M


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