NCP1237 ONSEMI [ON Semiconductor], NCP1237 Datasheet - Page 29

• Manufacturer Part Number: NCP1237
• Description: Fixed Frequency Current Mode Controller for Flyback Converters
• Manufacturer: ONSEMI [ON Semiconductor]

Temperature shutdown
a turn−off threshold guaranteed between 140°C and 160°C,
and a typical hysteresis of 30°C. When the temperature rises
above the high threshold, the controller stops switching
Internal Latch Signal
The die includes a temperature shutdown protection with
V
V
CC(min)
CC(on)
V
DRV
CC
allowed (no
latch event)
Switching
pre-start phase
Latch signal
Figure 27. Latch−off Function Timing Diagram
high during
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29
instantaneously, the HV current source is turned off, and the
internal logic state is reset.
HV startup current source is enabled, and a regular startup
sequence takes place.
When the temperature falls below the low threshold, the
initiated by
Start-up
V
CC(on)
(t
Latch
Noise spike
ignored
blanking)
Latch-off
time
time
time