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NCP1237 bảng dữ liệu(PDF) 29 Page - ON Semiconductor

tên linh kiện NCP1237
Giải thích chi tiết về linh kiện  Fixed Frequency Current Mode Controller for Flyback Converters
PDF  34 Pages
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NCP1237 bảng dữ liệu(HTML) 29 Page - ON Semiconductor

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Figure 27. Latch−off Function Timing Diagram
time
Internal Latch Signal
time
VCC
time
DRV
VCC(on)
VCC(min)
Latch signal
high during
pre-start phase
Noise spike
ignored
(tLatch blanking)
Start-up
initiated by
VCC(on)
Switching
allowed (no
latch event)
Latch-off
Temperature shutdown
The die includes a temperature shutdown protection with
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
instantaneously, the HV current source is turned off, and the
internal logic state is reset.
When the temperature falls below the low threshold, the
HV startup current source is enabled, and a regular startup
sequence takes place.



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