NCP1252 ON Semiconductor, NCP1252 Datasheet - Page 5

• Manufacturer Part Number: NCP1252
• Description: Flyback Applications
• Manufacturer: ON Semiconductor

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Table 4. ELECTRICAL CHARATERISTICS
(V
DRIVE OUTPUT
Output voltage fall−time
Clamping voltage (maximum gate voltage)
High−state voltage drop
CYCLE SKIP
Skip cycle level
Skip threshold Reset
Skip threshold Hysteresis
SOFT START
Soft−start charge current
Soft start completion voltage threshold
Internal delay before starting the Soft start
when V
PROTECTION
Current sense fault voltage level triggering
the timer
Timer delay before latching a fault (overload
or short circuit)
Brown−out voltage
Internal current source generating the
Brown−out hysteresis
3. Guaranteed by design
4. V
CC
10.2
10.0
9.8
9.6
9.4
9.2
9.0
8.8
ramp
= 15 V, R
−40
CC(on)
, R
−20
ramp
Figure 2. Supply Voltage Threshold vs.
Characteristics
is reached
T
= 43 kW, C
Guaranteed by design
0
Junction Temperature
TEMPERATURE (°C)
DRV
20
VCC(on)
VCC(off)
= 1 nF. For typical values T
40
60
R
R
V
80
V
DRV
DRV
TYPICAL CHARACTERISTICS
CC
CC
−25°C ≤ T
−5°C ≤ T
When CS pin > F
= V
Test Condition
= 47 kW, C
= 47 kW, C
= 15 V, C
SS pin = GND
100
V
90 to 10%
CC(min)
CC
http://onsemi.com
J
J
= 25 V
= 25°C, for min/max values T
J
≤ +125°C
≤ +125°C
120
DRV
DRV
+ 100 mV,
DRV
= 1nF,
5
CS
= 1 nF
= 1 nF
1.20
1.15
1.10
1.05
1.00
0.95
0.90
−40
V
V
V
DRV(clamp)
Symbol
SS
skip(reset)
skip(HYS)
T
V
V
V
V
F
I
I
SS
fault
BO
skip
delay
CS
BO
t
CL
SS
−20
f
Figure 3. Supply Voltage Hysteresis vs.
J
= –25°C to +125°C, unless otherwise noted)
0
0.974
Junction Temperature
Min
100
0.2
8.8
3.5
0.9
8.8
8.6
10
−
−
−
−
−
TEMPERATURE (°C)
20
40
V
skip(HYS)
V
Typ
120
0.3
skip
4.0
22
15
50
25
10
15
10
10
1
1
+
60
80
1.026
Max
11.2
11.2
500
155
0.4
4.5
1.1
18
11
20
−
−
−
100
Unit
mV
mV
ms
ms
mA
mA
ns
V
V
V
V
V
V
120