NCP1236
www.onsemi.com
7
ELECTRICAL CHARACTERISTICS (continued)
(For typical values T
J
= 25°C, for min/max values T
J
= −40°C to +125°C, V
HV
= 125 V, V
CC
= 11 V unless otherwise noted)
Characteristics UnitMaxTypMinSymbolTest Condition
FREQUENCY FOLDBACK
Feedback voltage threshold
below which frequency foldback
starts
V
FB(foldS)
1.8 2.0 2.2 V
Feedback voltage threshold
below which frequency foldback
is complete
V
FB(foldE)
1.22 1.35 1.48 V
Minimum switching frequency V
FB
= V
skip(in)
+ 0.2 f
OSC(min)
22 27 32 kHz
SKIP−CYCLE MODE
Feedback voltage thresholds for
skip mode
V
FB
going down
V
FB
going up
V
skip(in)
V
skip(out)
0.63
0.72
0.7
0.80
0.77
0.88
V
LATCH−OFF INPUT
High threshold
V
Latch
going up V
OVP
2.35 2.5 2.65 V
Low threshold V
Latch
going down V
OTP
0.76 0.8 0.84 V
Current source for direct NTC
connection
During normal operation
During soft−start
V
Latch
= 0 V
I
NTC
I
NTC(SSTART)
65
130
95
190
105
210
mA
Blanking duration on high latch
detection
65 kHz version
100 kHz version
t
Latch(OVP)
35
25
50
35
70
45
ms
Blanking duration on low latch
detection
t
Latch(OTP)
− 350 −
ms
Clamping voltage I
Latch
= 0 mA
I
Latch
= 1 mA
V
clamp0(Latch)
V
clamp1(Latch)
1.0
2.0
1.2
2.4
1.4
3.0
V
TEMPERATURE SHUTDOWN
Temperature shutdown (Note 7)
T
J
going up T
TSD
135 150 165 °C
Temperature shutdown
hysteresis (Note 7)
T
J
going down T
TSD(HYS)
20 30 40 °C
6. Internal supply current only, current in FB pin not included (current flowing in GND pin only).
7. Guaranteed by design.
