NCP1254 View Datasheet(PDF) - ON Semiconductor
Part Name
Description
Manufacturer
NCP1254
ON Semiconductor
NCP1254 Datasheet PDF : 25 Pages
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NCP1254
Table 4. ELECTRICAL CHARACTERISTICS
(For typical values TJ = 25°C, for min/max values TJ = −40°C to +125°C, Max TJ = 150°C, Vcc = 12 V unless otherwise noted)
Symbol
Rating
Pin
Min
Typ
Max
Unit
INTERNAL SLOPE COMPENSATION
Vramp
Rramp
PROTECTIONS
Internal ramp level @ 25°C (Note 4)
Internal ramp resistance to CS pin
4
2.5
V
4
20
kW
Vlatch
Tlatch−blank
Tlatch−count
Tlatch−del
Timer1
Timer2
VSC
VOVL
Latching level input
Blanking time after drive turn off
Number of clock cycles before latch confirmation
OVP detection time constant
Default − Overload Fault timer duration
Default − Fault timer duration when VFB > 4.1 V is Timer1/4
Feedback voltage beyond which a short−circuit is considered
Feedback voltage beyond which an over load is considered –
OPP pin is grounded
3
2.7
3
3.3
V
3
1
ms
−
4
3
600
ns
−
160
208
270
ms
−
40
52
68
ms
2
3.9
4.1
4.3
V
2
3.2
V
VOVP(regular)
Latched Over voltage protection on the Vcc rail
5
30.7
32.3
34
V
VOVP(copack)
Latched Over voltage protection on the Vcc rail
5
26
27.5
29
V
TOVP−del
Delay before OVP on Vcc confirmation
5
20
ms
2. Guaranteed by design
3. See characterization table for linearity over negative bias voltage – we recommend keeping the level on pin 3 below −300 mV.
4. A 1−MW resistor is connected from pin 4 to the ground for the measurement.
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