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NCP1252ADR2G

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
NCP1252
www.onsemi.com
4
Table 3. ELECTRICAL CHARATERISTICS
(V
CC
= 15 V, R
T
= 43 kW, C
DRV
= 1 nF. For typical values T
J
= 25°C, for min/max values T
J
= –25°C to +125°C, unless otherwise noted)
Characteristics
Test Condition Symbol Min Typ Max Unit
SUPPLY SECTION AND V
CC
MANAGEMENT
Startup threshold at which driving pulses
are authorized
V
CC
increasing
A, B, C versions
D & E versions
V
CC(on)
9.4
13.1
10
14
10.6
14.9
V
Minimum Operating voltage at which driving pulses
are stopped
V
CC
decreasing V
CC(off)
8.4 9 9.6 V
Hysteresis between V
CC(on)
and V
CC(min)
A, B and C versions
D & E versions
V
CC(HYS)
0.9
4.5
1.0
5.0
−
−
V
Start−up current, controller disabled V
CC
< V
CC(on)
& V
CC
increasing
from zero
I
CC1
− − 100
mA
Internal IC consumption, controller switching F
sw
=100 kHz, DRV = open I
CC2
0.5 1.4 2.2 mA
Internal IC consumption, controller switching F
sw
=100 kHz, C
DRV
= 1 nF I
CC3
2.0 2.7 3.5 mA
CURRENT COMPARATOR
Current Sense Voltage Threshold
V
ILIM
0.92 1 1.08 V
Leading Edge Blanking Duration t
LEB
− 160 − ns
Input Bias Current (Note 3) I
bias
− 0.02 −
mA
Propagation delay From CS detected to gate
turned off
t
ILIM
− 70 150 ns
Internal Ramp Compensation Voltage level @ 25°C (Note 4) V
ramp
3.15 3.5 3.85 V
Internal Ramp Compensation resistance to CS pin @ 25°C (Note 4) R
ramp
− 26.5 −
kW
INTERNAL OSCILLATOR
Oscillator Frequency
R
T
= 43 kW & DRV pin = 47 kW
f
OSC
92 100 108 kHz
Oscillator Frequency
R
T
= 8.5 kW & DRV pin = 47 kW
f
OSC
425 500 550 kHz
Frequency Modulation in percentage of f
OSC
(Note 3) f
jitter
− ±5 − %
Frequency modulation Period (Note 3) T
swing
− 3.33 − ms
Maximum operating frequency (Note 3) f
MAX
500 − − kHz
Maximum duty−cycle – A version DC
maxA
45.6 48 49.6 %
Maximum duty−cycle – B version DC
maxB
76 80 84 %
Maximum duty−cycle – C version DC
maxC
61 65 69 %
Maximum duty−cycle – D & E versions DC
maxD
44.2 45.6 47.2 %
FEEDBACK SECTION
Internal voltage division from FB to CS setpoint
FB
div
− 3 − −
Internal pull−up resistor R
pull−up
− 3.5 −
kW
FB pin maximum current FB pin = GND I
FB
1.5 − − mA
Internal feedback impedance from FB to GND Z
FB
− 40 −
kW
Open loop feedback voltage FB pin = open V
FBOL
− 6.0 − V
Internal Diode forward voltage (Note 3) V
f
− 0.75 − V
DRIVE OUTPUT
DRV Source resistance
R
SRC
− 10 30
W
DRV Sink resistance R
SINK
− 6 19
W
Output voltage rise−time V
CC
= 15 V, C
DRV
= 1 nF,
10 to 90%
t
r
− 26 − ns
3. Guaranteed by design
4. V
ramp
, R
ramp
Guaranteed by design
NCP1252
www.onsemi.com
5
Table 3. ELECTRICAL CHARATERISTICS
(V
CC
= 15 V, R
T
= 43 kW, C
DRV
= 1 nF. For typical values T
J
= 25°C, for min/max values T
J
= –25°C to +125°C, unless otherwise noted)
Characteristics UnitMaxTypMinSymbolTest Condition
DRIVE OUTPUT
Output voltage fall−time
V
CC
= 15 V, C
DRV
= 1 nF,
90 to 10%
t
f
− 22 − ns
Clamping voltage (maximum gate voltage) V
CC
= 25 V
R
DRV
= 47 kW, C
DRV
= 1 nF
V
CL
− 15 18 V
High−state voltage drop V
CC
= V
CC(min)
+ 100 mV, R
DRV
= 47 kW, C
DRV
= 1 nF
V
DRV(clamp)
− 50 500 mV
CYCLE SKIP
Skip cycle level
V
skip
0.2 0.3 0.4 V
Skip threshold Reset V
skip(reset)
− V
skip
+
V
skip(HY
S)
− V
Skip threshold Hysteresis V
skip(HYS)
− 25 − mV
SOFT START
Soft−start charge current
SS pin = GND I
SS
8.8 10 11
mA
Soft start completion voltage threshold V
SS
3.5 4.0 4.5 V
Internal delay before starting the Soft start when
V
CC(on)
is reached
For A, B and C versions only
− No delay for D & E versions
SS
delay
100 120 155 ms
PROTECTION
Current sense fault voltage level triggering the
timer
F
CS
0.9 1 1.1 V
Timer delay before latching a fault (overload or
short circuit) − A/B/C/D versions
When CS pin > F
CS
T
fault
10 15 20 ms
Timer delay before latching a fault (overload or
short circuit) − E version
When CS pin > F
CS
T
fault
120 155 200 ms
Brown−out voltage V
BO
0.974 1 1.026 V
Internal current source generating the Brown−out
hysteresis
−5°C ≤ T
J
≤ +125°C
−25°C ≤ T
J
≤ +125°C
I
BO
8.8
8.6
10
10
11.2
11.2
mA
3. Guaranteed by design
4. V
ramp
, R
ramp
Guaranteed by design
Table 4. SELECTION TABLE
NCP1252 Start−up Delay Duty Ratio Max VCC Start (Typ.) Fault Timer (Typ.) Fault
A Yes 50% 10 V 15 ms Latched
B Yes 80% 10 V 15 ms Latched
C Yes 65% 10 V 15 ms Latched
D No 47.5% 14 V 15 ms Latched
E No 47.5% 14 V 150 ms Latched
NCP1252
www.onsemi.com
6
TYPICAL CHARACTERISTICS
Figure 3. Supply Voltage Threshold vs.
Junction Temperature (A, B and C Versions)
Figure 4. Supply Voltage Hysteresis vs.
Junction Temperature (A, B and C Versions)
TEMPERATURE (°C) TEMPERATURE (°C)
100806040200−20−40
8.8
9.0
9.2
9.4
9.6
9.8
10.0
10.2
100806040200−20−40
0.90
0.95
1.00
1.05
1.10
1.15
1.20
UNDER VOLTAGE LOCK OUT LEVEL (V)
SUPPLY VOLTAGE HYSTERESIS LEVEL (V)
120
VCC(on)
VCC(off)
120
Figure 5. Supply Voltage V
CC(ON)
Threshold vs.
Junction Temperature (D Version)
Figure 6. Supply Voltage Hysteresis vs.
Junction Temperature (D Version)
TEMPERATURE (°C) TEMPERATURE (°C)
100806040200−20−40
13.0
13.5
14.0
14.5
15.0
100806040200−20−40
4.0
4.5
5.0
5.5
6.0
UNDER VOLTAGE LOCK OUT LEVEL (V)
SUPPLY VOLTAGE HYSTERESIS LEVEL (V)
120 120
Figure 7. Start−up Current (I
CC1
) vs. Junction
Temperature
Figure 8. Supply Current (I
CC3
) vs. Junction
Temperature
TEMPERATURE (°C) TEMPERATURE (°C)
100806040200−20−40
0
10
20
30
40
50
100806040200−20−40
0
1
2
3
4
5
STARTUP CURRENT ICC1 (mA)
SUPPLY CURRENT ICC3 (mA)
120 120
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

NCP1252ADR2G

Mfr. #:
Buy NCP1252ADR2G
Manufacturer:
ON Semiconductor
Description:
Switching Controllers CURR MDE PWM CNTRLR FWD FLYBCK APPS
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New from this manufacturer.
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