NCP1252 Ver la hoja de datos (PDF) - Unspecified
Número de pieza
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NCP1252 Datasheet PDF : 18 Pages
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NCP1252
Table 3. ELECTRICAL CHARATERISTICS
(VCC = 15 V, RT = 43 kW, CDRV = 1 nF. For typical values TJ = 25°C, for min/max values TJ = –25°C to +125°C, unless otherwise noted)
Characteristics
Test Condition
Symbol
Min
Typ
Max Unit
SUPPLY SECTION AND VCC MANAGEMENT
Startup threshold at which driving pulses are au-
thorized
VCC increasing
VCC(on)
9.4
10
10.6
V
Minimum Operating voltage at which driving pulses
are stopped
VCC decreasing
VCC(off)
8.4
9
9.6
V
Hysteresis between VCC(on) and VCC(min)
Start−up current, controller disabled
VCC(HYS)
0.9
1.0
−
V
VCC < VCC(on) & VCC increasing
from zero
ICC1
−
−
100 mA
Internal IC consumption, controller switching
Internal IC consumption, controller switching
CURRENT COMPARATOR
Fsw =100 kHz, DRV = open
Fsw =100 kHz, CDRV = 1 nF
ICC2
ICC3
0.5
1.4
2.2 mA
2.0
2.7
3.5 mA
Current Sense Voltage Threshold
Leading Edge Blanking Duration
Input Bias Current
Propagation delay
(Note 3)
From CS detected to gate
turned off
VILIM
tLEB
Ibias
tILIM
0.92
1
1.08
V
−
160
−
ns
−
0.02
−
mA
−
70
150
ns
Internal Ramp Compensation Voltage level
Internal Ramp Compensation resistance to CS pin
INTERNAL OSCILLATOR
@ 25°C (Note 4)
@ 25°C (Note 4)
Vramp
Rramp
3.15
3.5
3.85
V
−
26.5
−
kW
Oscillator Frequency
Oscillator Frequency
Frequency Modulation in percentage of fOSC
Frequency modulation Period
Maximum operating frequency
Maximum duty−cycle – A version
Maximum duty−cycle – B version
Maximum duty−cycle – C version
FEEDBACK SECTION
RT = 43 kW & DRV pin = 47 kW
RT = 8.5 kW & DRV pin = 47 kW
(Note 3)
(Note 3)
(Note 3)
fOSC
fOSC
fjitter
Tswing
fMAX
DCmaxA
DCmaxB
DCmaxC
92
425
−
−
500
45.6
76
61
100
500
±5
3.33
−
48
80
65
108 kHz
550 kHz
−
%
−
ms
−
kHz
49.6 %
84
%
69
%
Internal voltage division from FB to CS setpoint
Internal pull−up resistor
FB pin maximum current
Internal feedback impedance from FB to GND
Open loop feedback voltage
Internal Diode forward voltage
DRIVE OUTPUT
FB pin = GND
FB pin = open
(Note 3)
FBdiv
−
3
Rpull−up
−
3.5
IFB
1.5
−
ZFB
−
40
VFBOL
−
6.0
Vf
−
0.75
−
−
−
kW
−
mA
−
kW
−
V
−
V
DRV Source resistance
DRV Sink resistance
Output voltage rise−time
VCC = 15 V, CDRV = 1nF,
10 to 90%
RSRC
RSINK
tr
−
10
30
W
−
6
19
W
−
26
−
ns
Output voltage fall−time
VCC = 15 V, CDRV = 1nF,
tf
−
22
−
ns
90 to 10%
3. Guaranteed by design
4. Vramp, Rramp Guaranteed by design
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