ncp1927 ON Semiconductor, ncp1927 Datasheet - Page 6

• Manufacturer Part Number: ncp1927
• Description: Combination Power Factor Correction Controller And Flyback Controller For Flat Panel Tvs
• Manufacturer: ON Semiconductor

ELECTRICAL CHARACTERISTICS
1 V, V
values T
SUPPLY CIRCUIT
FLYBACK FEEDBACK
FLYBACK CURRENT SENSE
FLYBACK SOFT−START
OSCILLATOR
FLYBACK GATE DRIVE
3. Guaranteed by design
Supply Voltage
Supply Current
Equivalent Internal Pull−Up Resistor
V
Division Ratio
Overload Detection Filter
Flyback Fault Timer
FFB Pin Voltage
Current Sense Voltage Threshold
Leading Edge Blanking Duration
Propagation Delay
Immediate Fault Protection Threshold
Leading Edge Blanking Duration for
I
Input Bias Current
Current Sourced by the FCS Pin
Soft−Start Period
Base Oscillator Frequency
Maximum Duty Ratio
Frequency Modulation in Percentage of
f
Frequency Modulation Frequency
Oscillator Frequency Voltage Stability
FDRV Impedance
FDRV Rise Time (10% to 90%)
FDRV Fall Time (90% to 10%)
FDRV Low Voltage
CS(stop)
OSC
FFB
Startup Threshold
Minimum Operating Voltage
Internal latch reset level
PFC is switching at 70kHz
PFC is switching at 70kHz
Flyback Switching, PFC is in GTS
During Faults
Startup
Current Sense Voltage Threshold
Immediate Fault Protection
Sink
Source
PSKIP
to Internal Current Setpoint
J
= 25°C, for min/max values, T
Characteristics
= 0 V, V
FFB
= 2.4 V, V
FCS
= 0 V, V
J
is − 25°C to 125°C, unless otherwise noted)
(V
CC
V
V
V
V
FFB
Shutdown
CC
FFB
CC
1
Step V
V
C
= 12 V, V
st
V
V
FFB
FDRV
increasing, dV/dt = 1.25 mV/ms
decreasing, dV/dt = 125 mV/ms
= V
FCS
FDRV pulse to V
= 3 V, V
CC(MIN)
V
= 4.5 V to FDRV turn−off
CC
fold
FCS
= 0 V, 80% Duty Ratio
Test Condition
V
= open, C
= 0 V, V
V
I
V
CC
V
V
= V
V
V
FDRV
PFB
falling edge
− 0.2 V, C
FDRV
http://onsemi.com
FCS
FFB
FCS
FFB
FDRV
FCS
< V
0 V to 2 V, to FDRV
decreasing
CC(on)
= 2.4 V, V
= 4.5 V
CC
= 0.8 V
= open
= V
= 0 mA
dV/dt = 500 mV/ms
IENABLE
= 10 V
= 2 V
PDRV
< V
ILIM
− 0.2 V
FDRV
FCS
6
CC(MAX)
= open
POVUV
= V
= open, C
= open,
ILIM
= 2.3 V, V
PCT
= 1 nF, C
t
f
R
R
delay(FOVLD)
OSC(VSTAB)
V
V
I
t
V
PControl
V
t
I
ramp(MAX)
delay(ILIM)
FDRV(SNK)
FDRV(SRC)
Symbol
t
FCS(bias)
t
V
V
LEB(stop)
t
t
FDRV(low)
FFB(open)
t
CC(reset)
CS(stop)
SSTART
FDRV(r)
FDRV(f)
CS(stop)
FOVLD
D
R
V
K
f
CC(on)
CC(off)
f
I
I
I
I
I
t
f
MOD
OSC
CC1
CC2
CC3
CC4
CC5
LEB
jitter
MAX
FFB
ILIM
FFB
PDRV
= 4 V, V
= 1 nF, C
PZCD
0.655
0.95
Min
190
100
5.0
2.4
3.8
1.0
1.0
4.8
4.5
2.8
16
14
60
90
−1
60
76
−1
15
12
8
−
−
−
−
−
−
−
−
−
= 0 V, V
FDRV
0.700
1.05
12.5
0.06
Typ
250
120
150
125
$6
6.5
3.3
5.1
1.5
1.5
5.0
5.0
4.0
17
20
10
80
80
80
65
80
14
30
25
= 1 nF, for typical
9
−
−
−
PCS
= 0 V, V
0.725
Max
1.15
100
310
110
110
150
200
8.0
4.2
6.4
2.0
2.5
5.2
5.5
5.2
0.5
18
10
20
31
+1
70
84
+1
80
70
−
−
−
−
−
GTS
Unit
kHz
mA
mA
mA
mA
kW
ms
ms
mA
mA
mA
Hz
ms
ns
ns
ns
ns
ns
ns
%
%
%
W
W
V
V
V
V
V
=