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NCP1650
ELECTRICAL CHARACTERISTICS (continued) (Unless otherwise noted: V CC = 14 volts, C T = 470 pF, C 2 = 0.1 m F, T J = 25 ? C for
typical values. For min/max values T J is the applicable junction temperature.)
Characteristic
Symbol
Min
Typ
Max
Unit
POWER ERROR AMPLIFIER (V comp = 2.0 V, V ref = 2.5 V)
Input Offset Voltage (Note 3)
Transconductance
Output Source (V ref + 0.2 V)
Output Sink (V ref -- 0.2 V)
V IO
g m
I Osource
I Osink
--
60
10
--10
20
100
20
--20
--
150
--
--
mV
umho
m A
m A
Boost Current (V ref = 2.5 V nominal)
Source Boost Current Threshold
Sink Boost Current Threshold
Source Boost Current (1.3 X V ref )
Sink Boost Current
V fb(boost+)
V fb(boost--)
I (boost+)
I (boost--)
--
--
150
--150
1.175
0.825
250
--285
--
--
--
--
V/V
V/V
m A
m A
AC ERROR AMPLIFIER
Input Offset Voltage (Note 3)
Transconductance
Output Source (Pin 4 = 4 V, Pin 5 = 0 V)
Output Sink (Pin 4 = 0 V, Pin 5 = 4 V)
AC Inverting Input Clamp Voltage (250 m A) (T J = 25 ? C)
AC Inverting Input Clamp Voltage (250 m A) (T J = --40 ? C to +125 ? C)
Gain from AC comp to PWM+ (Av = V PWM+ / (V ACcomp – V offset )) (Note 3)
V IO
g m
I Osource
I Osink
V clamp
V clamp
A V
--
60
25
--25
4.30
3.70
--
20
100
70
--70
4.45
--
2.0
--
150
--
--
4.60
4.60
--
mV
umho
m A
m A
V
V
V/V
CURRENT SENSE AMPLIFIER
Input Bias Current (Pin 11)
Differential Input Voltage Range (Note 3)
Input Offset Voltage
Output Gain (150 m A/0.150 V) (Voltage Loop Outputs) (Note 3)
Output Gain (150 m A/0.150 V) (Max Pwr Output) (R 10 = 15 k Ω ) (Note 3)
Bandwidth (Note 3)
PWM Output Voltage Gain (k = V PWM + / V sense-- ) (Pin 13 = Open)
(T J = --40 ? C to + 125 ? C)
Current Limit Voltage Gain (k = Vac e/a / V sense-- ) (V pin5 = 0, R 10 = 15 k)
Power Output Voltage Gain (k = V pin10 / V sense-- ) (T J = --40 ? C to + 125 ? C)
Current Limit Threshold (V pin5 = 0, Pin 13 = Open)
Current Limit Delay (0 to –450 mV Step) (Note 3)
I bias
V Idiff
V IO
Av
Av
f unity
Av
Av
k
I LIMthr
I LIMdelay
--40
--
0
--
--
--
12.9
13
13.4
225
--
--50
--0.20
2.5
1000
1000
1.5
15
15
15
270
300
--80
--
5.0
--
--
--
17
17
17
315
--
m A
V
mV
umho
umho
MHz
V/V
V/V
V/V
mV
nS
REFERENCE MULTIPLIER
Dynamic Input Voltage Range
Ac Input (p--input) (Note 3)
Compensation Input (a--input) (Note 3)
Offset Voltage (a--input)
V max
--
--
--
3.75
--
1.0
--
--
--
V
Multiplier Gain
(Note 3)
k =
Vmult out
(VAC ∕ Vramp pk) × (VLOOPcomp ? Voffset)
k
--
8.0
--
1.0/V
3. Verified by design.
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