ncp1927 ON Semiconductor, ncp1927 Datasheet - Page 7

• 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
FLYBACK GATE DRIVE
FLYBACK SKIP MODE/FREQ FOLDBACK
PFC CURRENT SENSE
PFC RAMP CONTROL
PFC GATE DRIVE
PFC ZERO CURRENT DETECTION
3. Guaranteed by design
FDRV Voltage Drop
FDRV Clamp Voltage
Skip Threshold
Skip Comparator Hysteresis
Soft−Skip Duration
Frequency Foldback Threshold
Minimum Switching Frequency
Maximum On Time
PCS Pin Voltage
Overcurrent Protection Threshold
Propagation Delay
PCT Charge Current
C
Maximum PCT Level Before PDRV
Switches Off
Propagation Delay of the PWM
Comparator
PFC Frequency Clamp
PDRV Impedance
PDRV Rise Time (10 % to 90 %)
PDRV Fall Time (90 % to 10 %)
PDRV Low Voltage
PDRV Voltage Drop
PDRV Clamp Voltage
Zero Current Detection Threshold
Hysteresis on Voltage Threshold
Propagation Delay
PCT
Sink
Source
Rising
Falling
PSKIP
Discharge Time
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
Frequency Foldback or Skip Mode
FFB
Shutdown
PControl
PControl
V
1
R
= 12 V, V
step V
st
Step V
PCT
PCS
I
V
V
Decreasing, dV/dt = 500 mV/ms
V
step I
OCP
V
Pulse to V
V
V
CC
CC
FFB
ZCD(rising)
CC
CC
= V
= 2.5 kW, I
V
PCT
= 30 V, I
= 30 V, I
= open, C
= open, C
Test Condition
to PDRV falling edge
R
R
= 0 V, V
R
FFB
PCS
V
PZCD
= V
= V
I
= V
V
R
V
PDRV
FDRV
PDRV
PCT(MAX)
PFB
PCS
PDRV
http://onsemi.com
PCT
PCS
PDRV
from 3.5 V to 5.0 V
600 mV
FSKIP
CC(off)
CC(off)
Decreasing
0 mA to 400 mA
= 2.4 V, V
FCS
= 2.5 kW
from 2 V to 0 V
− V
= 1.5 V
= 0 mA
= 33 kW
= 1 kW
= 33 kW
PDRV
FDRV
IENABLE
= 10 V
= 2 V
PCS
PControl
PControl
ZCD(falling)
+ 150 mV
= V
+ 0.2 V,
+ 0.2 V,
−100 mV to
7
= 0 mA
= 0 mA
= 265 mA
fold
POVUV
= open, C
/K
= 10 nF
= 10 nF
FFB
= 2.3 V, V
PCT
t
= 1 nF, C
CPCT(discharge)
V
V
V
R
R
V
V
V
I
V
V
V
V
PCT(charge)
PDRV(clamp)
FDRV(clamp)
PControl
f
FSKIP(HYS)
FDRV(drop)
PDRV(SNK)
PDRV(SRC)
PDRV(drop)
ZCD(falling)
Symbol
OSC(MIN)
t
ZCD(rising)
PCT(MAX)
t
t
PDRV(low)
ZCD(HYS)
V
on(MAX)
t
PDRV(r)
PDRV(f)
f
V
t
SSKIP
V
I
t
t
clamp
FSKIP
PWM
OCP
OCP
ZCD
PCS
fold
PDRV
= 4 V, V
= 1 nF, C
PZCD
1.26
10.0
1.12
0.56
Min
630
−20
230
189
330
560
4.7
11
65
50
21
15
12
11
−
−
−
−
−
−
−
−
−
= 0 V, V
FDRV
13.5
1.40
13.0
12.5
0.06
13.5
1.40
0.70
Typ
700
100
100
250
100
210
150
385
700
100
5.0
26
14
30
25
= 1 nF, for typical
−
0
−
−
PCS
= 0 V, V
Max
1.54
16.0
1.68
0.84
770
135
140
265
210
231
500
200
440
840
170
5.3
0.5
16
31
20
80
70
16
1
−
−
1
GTS
Unit
kHz
kHz
mV
mV
mV
mV
mA
mA
ms
ms
ns
ns
ns
ns
ns
ns
W
W
V
V
V
V
V
V
V
V
=