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NCP1651
http://onsemi.com
4
ELECTRICAL CHARACTERISTICS (Unless otherwise noted: V
CC
= 14 volts, C
T
= 470 pF, C
12
= 0.1 mF, T
j
= 25癈 for typical
values. For min/max values T
j
is the applicable junction temperature.)
Characteristic
Symbol
Min
Typ
Max
Unit
OSCILLATOR
Frequency
T
j
= - -40癈 to +125癈
F
osc
90
100
110
kHz
Frequency Range (Note 1)
- -
25
- -
250
kHz
Max Duty Cycle
dmax
0.95
- -
- -
- -
Ramp Peak (Note 1)
V
Rpeak
- -
4.0
- -
V
Ramp Valley (Note 1)
V
Rvalley
- -
0.100
- -
V
Ramp Compensation Peak Voltage (Pin 4) (Note 1)
- -
- -
4.0
- -
V
Ramp Compensation Current (Pin 4) (Note 1)
- -
- -
150
- -
mA
AC ERROR AMPLIFIER (V
comp
= 2.0 V)
Input Offset Voltage
V
IO
- -
20
- -
mV
Transconductance
g
m
75
100
150
umho
Output Source
I
Osource
25
70
- -
mA
Output Sink
I
Osink
- -25
- -70
- -
mA
CURRENT AMPLIFIER
Input Bias Current (Pin 5)
I
bias
40
60
80
mA
Input Offset Voltage (V
comp
= 2.0) T
j
= - -40癈 to +85癈
T
j
= - -40癈 to +125癈
VIO
0
0
3.0
3.0
10
20
mV
Current Limit Threshold
I
LIMthr
0.715
- -
0.79
V
Output Gain (150 mA/0.150 V) (Voltage Loop Outputs)
- -
- -
1000
- -
umho
Output Gain (150 mA/0.150 V) (AC E/A Output) (R
10
= 15 k?
- -
- -
1000
- -
umho
Leading Edge Blanking Pulse (Note 1)
t
LEB
- -
200
- -
ns
Bandwidth (Note 1)
- -
- -
1.5
- -
MHz
PWM Output Voltage Gain (k = V
PWM
+ / (V
sense+
- - V
sense- -
))
(V
pin 3
= V
pin 13
= 0)
Av
4.0
5.0
6.0
V/V
Current Limit Voltage Gain
(k = Vac
e/a
- - / (V
sense+
- - V
sense- -
)) (V
pin5
9 = 0) (R7 = 15 k)
Av
8.0
10
12
V/V
AVERAGE CURRENT COMPENSATION AMPLIFIER
Voltage Gain
Av
- -
0.75
- -
V/V
REFERENCE MULTIPLIER
Dynamic Input Voltage Range
Ac Input (p- -input) (Note 1)
Offset Voltage (a- -input)
V
max
- -
- -
3.50
1.0
- -
- -
V
Multiplier Gain
(Note 1)
k =
V
mult out
(V
AC
V
ramp pk
) ?(V
LOOPcomp
 V
offset
)
k
- -
7.5
- -
- -
AC INPUT (Pin 5)
Input Bias Current (Total bias current for reference multiplier and current
compensation amplifier) (Note 1)
I
INbias
- -
0.01
- -
mA
1.  Verified by design.
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