參數資料
型號： NCP1927DR2G
廠商： ON Semiconductor
文件頁數： 7/24頁
文件大?。?/td> 531K
描述： IC CTLR PFC/FLYBACK 16-SOIC
標準包裝： 2,500
系列： *
NCP1927
http://onsemi.com
7
ELECTRICAL CHARACTERISTICS (V
CC
 = 12 V, V
PFB
 = 2.4 V, V
POVUV
 = 2.3 V, V
PControl
 = 4 V, V
PZCD
 = 0 V, V
PCS
 = 0 V, V
GTS
 =
1 V, V
PSKIP
 = 0 V, V
FFB
 = 2.4 V, V
FCS
 = 0 V, V
Shutdown
 = 0 V, V
IENABLE
 = open, C
PCT
 = 1 nF, C
PDRV
 = 1 nF, C
FDRV
 = 1 nF, for typical
values T
J
 = 25癈, for min/max values, T
J
 is  25癈 to 125癈, unless otherwise noted)
Characteristics
Unit
Max
Typ
Min
Symbol
Test Condition
FLYBACK GATE DRIVE
FDRV Impedance
Sink
Source
V
FDRV
 = 10 V
V
FDRV
 = 2 V
R
FDRV(SNK)
R
FDRV(SRC)


12.5
14


W
W
FDRV Rise Time (10% to 90%)
t
FDRV(r)
15
30
80
ns
FDRV Fall Time (90% to 10%)
t
FDRV(f)
12
25
70
ns
FDRV Low Voltage
I
FDRV
 = 0 mA
V
FDRV(low)

0.06
0.5
V
FDRV Voltage Drop
V
CC
 = V
CC(off)
 + 0.2 V,
R
FDRV
 = 33 kW
V
FDRV(drop)


1
V
FDRV Clamp Voltage
V
CC
 = 30 V, I
FDRV
 = 0 mA
V
FDRV(clamp)
11
13.5
16
V
FLYBACK SKIP MODE/FREQ FOLDBACK
Skip Threshold
V
FFB
 Decreasing
V
FSKIP
630
700
770
mV
Skip Comparator Hysteresis
V
FSKIP(HYS)
65
100
135
mV
SoftSkip Duration
1
st
 Pulse to V
FCS
 = V
fold
/K
FFB
t
SSKIP
50
100
140
ms
Frequency Foldback Threshold
V
FFB
 Decreasing, dV/dt = 500 mV/ms
V
fold
1.26
1.40
1.54
V
Minimum Switching Frequency
V
FFB
 = V
FSKIP
 + 150 mV
f
OSC(MIN)
21
26
31
kHz
Maximum On Time
Frequency Foldback or Skip Mode
t
on(MAX)
10.0
13.0
16.0
ms
PFC CURRENT SENSE
PCS Pin Voltage
R
PCS
 = 2.5 kW, I
PCS
 = 265 mA
V
PCS
20
0
20
mV
Overcurrent Protection Threshold
R
PCS
 = 2.5 kW
I
OCP
230
250
265
mA
Propagation Delay
step I
PCS
 0 mA to 400 mA
I
OCP
 to PDRV falling edge
R
PCS
 = 1 kW
t
OCP

100
210
ns
PFC RAMP CONTROL
PCT Charge Current
V
PCT
 = 1.5 V
I
PCT(charge)
189
210
231
mA
C
PCT
 Discharge Time
V
PControl
 = open, C
PControl
 = 10 nF
V
PCT
 = V
PCT(MAX)
 100 mV to
600 mV
t
CPCT(discharge)


500
ns
Maximum PCT Level Before PDRV
Switches Off
V
PControl
 = open, C
PControl
 = 10 nF
V
PCT(MAX)
4.7
5.0
5.3
V
Propagation Delay of the PWM
Comparator
step V
PCT
 from 3.5 V to 5.0 V
t
PWM

150
200
ns
PFC Frequency Clamp
f
clamp
330
385
440
kHz
PFC GATE DRIVE
PDRV Impedance
Sink
Source
V
PDRV
 = 10 V
V
PDRV
 = 2 V
R
PDRV(SNK)
R
PDRV(SRC)


12.5
14


W
W
PDRV Rise Time (10 % to 90 %)
t
PDRV(r)
15
30
80
ns
PDRV Fall Time (90 % to 10 %)
t
PDRV(f)
12
25
70
ns
PDRV Low Voltage
I
PDRV
 = 0 mA
V
PDRV(low)

0.06
0.5
V
PDRV Voltage Drop
V
CC
 = V
CC(off)
 + 0.2 V,
R
PDRV
 = 33 kW
V
PDRV(drop)


1
V
PDRV Clamp Voltage
V
CC
 = 30 V, I
PDRV
 = 0 mA
V
PDRV(clamp)
11
13.5
16
V
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