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NCP1235 Datasheet(PDF) 6 Page - ON Semiconductor

Part # NCP1235
Description  Fixed Frequency Current Mode Controller
Download  34 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1235 Datasheet(HTML) 6 Page - ON Semiconductor

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NCP1235
www.onsemi.com
6
ELECTRICAL CHARACTERISTICS (continued)
(For typical values TJ = 25°C, for min/max values TJ = −40°C to +125°C, VHV = 125 V, VCC = 11 V unless otherwise noted)
Characteristics
Unit
Max
Typ
Min
Symbol
Test Condition
CURRENT SENSE
Input Bias Current
VCS = 0.7 V
Ibias
0.02
mA
Maximum internal current
setpoint
VFB > 3.5 V
VILIM
0.66
0.7
0.74
V
Propagation delay from VIlimit
detection to DRV off
VCS = VILIM
tdelay
80
110
ns
Leading Edge Blanking Duration
for VILIM
tLEB
190
250
310
ns
Threshold for immediate fault
protection activation
VCS(stop)
0.95
1.05
1.15
V
Leading Edge Blanking Duration
for VCS(stop)
tBCS
90
120
150
ns
Slope of the compensation ramp
Scomp(65kHz)
−26
−32.5
−39
mV /
ms
Soft−start duration
From 1st pulse to VCS = VILIM
tSSTART
12
16
22
ms
OVERPOWER COMPENSATION
VHV to IOPC conversion ratio
KOPC
0.54
mA / V
Current flowing out of CS pin
VHV = 125 V
VHV = 162 V
VHV = 325 V
VHV = 365 V
IOPC(125)
IOPC(162)
IOPC(325)
IOPC(365)
105
0
20
110
130
150
mA
FB voltage above which IOPC is
applied
VHV = 365 V
VFB(OPCF)
2.12
2.35
2.58
V
FB voltage below which is no
IOPC applied
VHV = 365 V
VFB(OPCE)
2.15
V
Watchdog timer for dc operation
tWD(OPC)
32
ms
FEEDBACK
Internal pull−up resistor
TJ = 25°C
RFB(up)
15
20
25
k
W
VFB to internal current setpoint
division ratio
KFB
4.7
5
5.3
Internal pull−up voltage on the
FB pin
VFB(ref)
4.3
5
5.7
V
OVERCURRENT PROTECTION
Fault timer duration
From CS reaching VILIMIT to DRV stop
tfault
98
128
168
ms
Fault timer duration (for the C
version only)
From CS reaching VILIMIT to DRV stop
tfault
16
32
48
ms
Autorecovery mode latch−off
time duration
tautorec
0.85
1.00
1.35
s
Autorecovery mode latch−off
time duration (for the C version
only)
tautorec
1.0
1.5
2.0
s
FREQUENCY FOLDBACK
Feedback voltage threshold
below which frequency foldback
starts
VFB(foldS)
1.8
2.0
2.2
V
6. Internal supply current only, current in FB pin not included (current flowing in GND pin only).
7. Guaranteed by design.


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