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NCP1236AD65R2G Datasheet, PDF (6/34 Pages) ON Semiconductor – Fixed Frequency Current Mode Controller for Flyback Converters
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NCP1236
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
Test Condition
Symbol
Min
Typ
Max
OUTPUT DRIVER
High−state voltage drop
VCC = VCC(min) + 0.2 V, RDRV = 33 kW,
VDRV(drop)
−
−
1
DRV high
CURRENT SENSE
Input Bias Current
Maximum internal current
setpoint
VCS = 0.7 V
VFB > 3.5 V
Ibias
VILIM
−
0.02
−
0.66
0.7
0.74
Propagation delay from VIlimit
detection to DRV off
VCS = VILIM
tdelay
−
80
110
Leading Edge Blanking Duration
for VILIM
Threshold for immediate fault
protection activation
tLEB
VCS(stop)
190
250
310
0.95 1.05 1.15
Leading Edge Blanking Duration
for VCS(stop)
Slope of the compensation ramp
Soft−start duration
OVERPOWER COMPENSATION
From 1st pulse to VCS = VILIM
tBCS
90
120
150
Scomp(65kHz)
−
−32.5
−
Scomp(100kHz)
−
−50
−
tSSTART
2.8
4.0
5.2
VHV to IOPC conversion ratio
Current flowing out of CS pin
FB voltage above which IOPC is
applied
VHV = 125 V
VHV = 162 V
VHV = 325 V
VHV = 365 V
VHV = 365 V
KOPC
IOPC(125)
IOPC(162)
IOPC(325)
IOPC(365)
VFB(OPCF)
−
0.54
−
−
0
−
−
20
−
−
110
−
105
130
150
2.12 2.35 2.58
FB voltage below which is no
IOPC applied
Watchdog timer for dc operation
FEEDBACK
Internal pull−up resistor
VFB to internal current setpoint
division ratio
VHV = 365 V
TJ = 25C
VFB(OPCE)
tWD(OPC)
RFB(up)
KFB
−
2.15
−
−
32
−
15
20
25
4.7
5
5.3
Internal pull−up voltage on the
FB pin
VFB(ref)
4.3
5
5.7
Unit
V
mA
V
ns
ns
V
ns
mV /
ms
ms
mA / V
mA
V
V
ms
kW
−
V
OVERCURRENT PROTECTION
Fault timer duration
From CS reaching VILIMIT to DRV stop
tfault
98
128
168
ms
Fault timer duration (for the C
From CS reaching VILIMIT to DRV stop
tfault
16
32
48
ms
version only)
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
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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