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NCP1271 Datasheet(PDF) 5 Page - ON Semiconductor

Part No. NCP1271
Description  Soft−Skip Mode Standby PWM Controller with Adjustable Skip Level and External Latch
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1271 Datasheet(HTML) 5 Page - ON Semiconductor

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NCP1271
http://onsemi.com
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ELECTRICAL CHARACTERISTICS (For typical values TJ = 25°C, for min/max values, TJ = −40°C to +125°C, VCC = 14 V,
HV = open, skip = open, FB = 2 V, CS = Ground, DRV = 1 nF, unless otherwise noted.)
Characteristic
Pin
Symbol
Min
Typ
Max
Unit
OSCILLATOR
Oscillation Frequency (65 kHz Version, TJ = 25_C)
Oscillation Frequency (65 kHz Version, TJ = −40 to + 85_C)
Oscillation Frequency (65 kHz Version, TJ = −40 to + 125_C)
Oscillation Frequency (100 kHz Version, TJ = 25_C)
Oscillation Frequency (100 kHz Version, TJ = −40 to +85_C)
Oscillation Frequency (100 kHz Version, TJ = −40 to +125_C)
5
fosc
61.75
58
55
95
89
85
65
65
65
100
100
100
68.25
69
69
105
107
107
kHz
Oscillator Modulation Swing, in Percentage of fosc
5
"7.5
%
Oscillator Modulation Swing Period
5
6.0
ms
Maximum Duty Cycle (VCS = 0 V, VFB = 2.0 V)
5
Dmax
75
80
85
%
GATE DRIVE
Gate Drive Resistance
Output High (VCC = 14 V, Drv = 300 W to Gnd)
Output Low (VCC = 14 V, Drv = 1.0 V)
5
ROH
ROL
6.0
2.0
11
6.0
20
12
W
Rise Time from 10% to 90% (Drv = 1.0 nF to Gnd)
5
tr
30
ns
Fall Time from 90% to 10% (Drv = 1.0 nF to Gnd)
5
tf
20
ns
CURRENT SENSE
Maximum Current Threshold
3
ILimit
0.95
1.0
1.05
V
Soft−Start Duration
tSS
4.0
ms
Soft−Skip Duration
tSK
300
ms
Leading Edge Blanking Duration
3
tLEB
100
180
330
ns
Propagation Delay (Drv =1.0 nF to Gnd)
50
150
ns
Ramp Current Source Peak
3
Iramp(H)
100
mA
Ramp Current Source Valley
3
Iramp(L)
0
mA
SKIP
Default Standby Skip Threshold (Pin 1 = Open)
2
Vskip
1.2
V
Skip Current (Pin 1 = 0 V, TJ = 25_C)
1
Iskip
26
43
56
mA
Skip Level Reset (Note 5)
1
Vskip−reset
5.0
5.7
6.5
V
Transient Load Detection Level to Disable Soft−Skip Mode
2
VTLD
2.6
2.85
3.15
V
EXTERNAL LATCH
Latch Protection Threshold
1
Vlatch
7.1
8.0
8.7
V
Latch Threshold Margin (Vlatch−m = VCC(off) − Vlatch)
1
Vlatch−m
0.6
1.2
V
Noise Filtering Duration
1
13
ms
Propagation Delay (Drv = 1.0 nF to Gnd)
1
Tlatch
100
ns
SHORT−CIRCUIT FAULT PROTECTION
Time for Validating Short−Circuit Fault Condition
2
tprotect
130
ms
5. Please refer to Figure 39 for detailed description.
6. Guaranteed by design.


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