NCP1236
ELECTRICAL CHARACTERISTICS (continued)
(For typical values T = 25C, for min/max values T = −40C to +125C, V = 125 V, V = 11 V unless otherwise noted)
J
J
HV
CC
Characteristics
Test Condition
Symbol
Min
Typ
Max
Unit
FREQUENCY FOLDBACK
Feedback voltage threshold
below which frequency foldback
starts
V
1.8
2.0
2.2
V
FB(foldS)
FB(foldE)
OSC(min)
Feedback voltage threshold
below which frequency foldback
is complete
V
1.22
22
1.35
27
1.48
32
V
Minimum switching frequency
V
= V
+ 0.2
f
kHz
V
FB
skip(in)
SKIP−CYCLE MODE
Feedback voltage thresholds for
skip mode
V
FB
V
FB
going down
going up
V
V
0.63
0.72
0.7
0.80
0.77
0.88
skip(in)
skip(out)
LATCH−OFF INPUT
High threshold
V
Latch
V
Latch
V
Latch
going up
going down
= 0 V
V
V
2.35
0.76
2.5
0.8
2.65
0.84
V
V
OVP
Low threshold
OTP
Current source for direct NTC
connection
mA
During normal operation
During soft−start
I
65
130
95
190
105
210
NTC
I
NTC(SSTART)
Blanking duration on high latch
detection
65 kHz version
100 kHz version
t
35
25
50
35
70
45
ms
ms
V
Latch(OVP)
Blanking duration on low latch
detection
t
−
350
−
Latch(OTP)
Clamping voltage
I
I
= 0 mA
= 1 mA
V
V
1.0
2.0
1.2
2.4
1.4
3.0
Latch
Latch
clamp0(Latch)
clamp1(Latch)
TEMPERATURE SHUTDOWN
Temperature shutdown (Note 7)
T going up
T
135
20
150
30
165
40
C
C
J
TSD
T
TSD(HYS)
Temperature shutdown
hysteresis (Note 7)
T going down
J
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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7
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