NCP1288
ELECTRICAL CHARACTERISTICS (For typical values TJ = 25°C, for min/max values TJ = −40°C to +125°C, VHV = 120 V,
VCC = 11 V unless otherwise noted)
Characteristics
Test Condition
Symbol Min Typ Max
FREQUENCY FOLDBACK
Feedback Voltage Threshold below which frequency
foldback starts
VFB(fold)
1.3 1.4 1.5
Minimum Switching Frequency
Threshold below which the frequency foldback is
finished and the controller switches at fOSC(min)
SKIP CYCLE MODE
VFB = Vskip(in) + 0.2 V
fOSC(min)
21
27
31
VFB(endfold)
−
1.0
−
Feedback Voltage Thresholds for Skip Mode
Soft−Skip Duration
LATCH−OFF INPUT
VFB going down
VFB going up
From 1st pulse to VCS =
VFB(fold) / KFB
Vskip(in)
Vskip(out)
tSSKIP
0.63 0.7 0.77
0.72 0.80 0.88
−
100
−
High Threshold
Low Threshold
Current Source for Direct NTC Connection
During normal operation
During soft−start
Blanking Duration on High Latch Detection
Blanking Duration on Low Latch Detection
Clamping Voltage
TEMPERATURE SHUTDOWN
VLatch going up
VLatch going down
VLatch = 0 V
ILatch = 0 mA
ILatch = 1 mA
VOVP
VOTP
2.37 2.5 2.63
0.76 0.8 0.84
INTC
78
91 104
INTC(SSTART) 156 182 208
tLatch(OVP)
40
55
70
tLatch(OTP)
−
400
−
Vclamp0(Latch) 1.0
1.2
1.4
Vclamp1(Latch) 1.8
2.3
2.8
Temperature Shutdown
TJ going up
TTSD
135 150 165
Temperature Shutdown Hysteresis
TJ going down
TTSD(HYS)
20
30
40
6. Internal supply current only, current in FB pin not included (current flowing through GND pin only).
Unit
V
kHz
V
V
ms
V
V
mA
ms
ms
V
°C
°C
http://onsemi.com
7