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NCP1652, NCP1652A
ELECTRICAL CHARACTERISTICS (V CC = 15 V, V AC IN = 3.8 V, V FB = 2.0 V, V FF = 2.4 V, V Latch = open, V ISPOS = ? 100 mV,
C OUTA = 1 nF, C T = 470 pF, C IAVG = 0.27 nF, C Latch = 0.1 nF, C M = 10 nF, R IAVG = 76.8 k W , R delay = 49.9 k W ,
C OUTB = 330 pF, R RC = 43 k W , For typical Value T J = 25 ° C, for min/max values T J = ? 40 ° C to 125 ° C, unless otherwise noted)
Parameter
Test Condition
Symbol
Min
Typ
Max
Unit
OSCILLATOR
Frequency
Frequency Modulation in Percentage
of f OSC
Frequency Modulation Period
Ramp Peak Voltage
Ramp Valley Voltage
f osc
V CT(peak)
V CT(valley)
90
–
–
–
–
100
6.8
6.8
4.0
0.10
110
–
–
–
–
kHz
%
ms
V
V
Maximum Duty Ratio
Ramp Compensation Peak Voltage
R delay = open
D
V RCOMP(peak)
94
–
?
4
–
–
%
V
AC ERROR AMPLIFIER
Input Offset Voltage (Note 3)
Ramp I AVG , V FB = 0 V
ACV IO
40
–
mV
Error Amplifier Transconductance
g m
–
100
–
m S
Source Current
Sink Current
V AC COMP = 2.0 V, V AC IN = 2.0 V,
V FF = 1.0 V
V AC COMP = 2.0 V, V A C_IN = 2.0 V,
V FF = 5.0 V
I EA(source)
I EA(sink)
25
? 25
70
? 70
–
–
m A
m A
CURRENT AMPLIFIER
Input Bias Current
Input Offset Voltage
Current Limit Threshold
Leading Edge Blanking Duration
Bandwidth
V ISPOS = 0 V
V AC COMP = 5.0 V, V ISpos = 0 V
force OUTA high, V AC COMP = 3.0 V,
ramp V ISPOS , V Ramp_Comp = open
CAI bias
CAV IO
V ILIM
t LEB
40
? 20
0.695
–
–
53
0
0.74
200
1.5
80
20
0.77
–
–
m A
mV
V
ns
MHz
PWM Output Voltage Gain
PWMk +
4
(V ILIM * C AVIO )
PWMk
4.0
5.3
6.0
V/V
Current Limit Voltage Gain (See
Current Sense Section)
ISVK +
V (AVG)
VI SPOS
ISVk
15.4
18.5
23
V/V
REFERENCE GENERATOR
Reference Generator Gain
k +
V AC_REF @ V FF 2
V FB @ V AC_IN
k
–
0.55
–
V
Reference Generator output voltage
(low input ac line and full load)
Reference Generator output voltage
(high input ac line and full load)
Reference Generator output Voltage
(low input as line and minimum load)
Reference Generator output voltage
(high input ac line and minimum load)
Reference Generator output offset
voltage
V AC IN = 1.2 V, V FF = 0.765 V,
V FB = 4 V
V AC IN = 3.75 V, V FF = 2.39 V,
V FB = 4.0 V
V AC IN = 1.2 V, V FF = 0.765 V,
V FB = 2.0 V
V AC IN = 3.75 V, V FF = 2.39 V,
V FB = 2.0 V
RG out1
RG out2
RG out3
RG out4
RG offset
3.61
1.16
1.85
0.55
? 100
4.36
1.35
2.18
0.65
–
4.94
1.61
2.58
0.78
100
Vpk
Vpk
Vpk
Vpk
mV
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