NCP1234 查看數據表（PDF） - ON Semiconductor
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NCP1234 Datasheet PDF : 33 Pages
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NCP1234
ELECTRICAL CHARACTERISTICS (For typical values TJ = 25C, for min/max values TJ = −40C to +125C, VHV = 125 V,
VCC = 11 V unless otherwise noted)
Characteristics
Test Condition
Symbol
Min
Typ
Max Unit
FEEDBACK
Internal pull−up resistor
VFB to internal current setpoint
division ratio
TJ = 25C
RFB(up)
KFB
15
20
25
kW
4.7
5
5.3
−
Internal pull−up voltage on the
FB pin
VFB(ref)
4.3
5
5.7
V
CURRENT SENSE
Input Bias Current
Maximum internal current
setpoint
Propagation delay from VIlimit
detection to DRV off
Leading Edge Blanking Duration
for VILIM
Threshold for immediate fault
protection activation
Leading Edge Blanking Duration
for VCS(stop)
Slope of the compensation ramp
VCS = 0.7 V
VFB > 3.5 V
VCS = VILIM
Soft−start duration
OVERPOWER COMPENSATION
VHV to IOPC conversion ratio
Current flowing out of CS pin
FB voltage above which IOPC is
applied
FB voltage below which is no
IOPC applied
Watchdog timer for dc operation
HV sampling level
OVERCURRENT PROTECTION
Fault timer duration
Autorecovery mode latch−off
time duration
FREQUENCY FOLDBACK
Feedback voltage threshold
below which frequency foldback
starts
Feedback voltage threshold
below which frequency foldback
is complete
Minimum switching frequency
SKIP−CYCLE MODE
Feedback voltage thresholds for
skip mode
From 1st pulse to VCS = VILIM
VHV = 125 V
VHV = 162 V
VHV = 325 V
VHV = 365 V
VHV = 365 V
VHV = 365 V
From CS reaching VILIMIT to DRV stop
VFB = Vskip(in) + 0.2
VFB going down
VFB going up
Ibias
VILIM
−
0.66
tdelay
−
tLEB
190
VCS(stop)
0.95
tBCS
90
Scomp(65kHz)
−
Scomp(100kHz)
−
tSSTART
2.8
KOPC
IOPC(125)
IOPC(162)
IOPC(325)
IOPC(365)
VFB(OPCF)
VFB(OPCE)
tWD(OPC)
VHVsample
−
−
−
−
105
2.12
−
−
−
tfault
tautorec
98
0.85
VFB(foldS)
1.8
VFB(foldE)
1.22
fOSC(min)
Vskip(in)
Vskip(out)
22
0.63
0.72
0.02
0.7
80
250
1.05
120
−32.5
−50
4.0
0.54
0
20
110
130
2.35
2.15
32
92
128
1.00
2.0
1.35
27
0.7
0.80
−
mA
0.74
V
110
ns
310
ns
1.15
V
150
ns
−
mV /
−
ms
5.2
ms
−
mA / V
−
mA
−
−
150
2.58
V
−
V
−
ms
−
V
168
ms
1.35
s
2.2
V
1.48
V
32
kHz
0.77
V
0.88
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