NCP1650
ELECTRICAL CHARACTERISTICS (continued) (Unless otherwise noted: VCC = 14 volts, CT = 470 pF, C2 = 0.1 mF, TJ = 25°C for
typical values. For min/max values TJ is the applicable junction temperature.)
Characteristic
Symbol
Min
Typ
Max
Unit
POWER ERROR AMPLIFIER (Vcomp = 2.0 V, Vref = 2.5 V)
Input Offset Voltage (Note 3)
Transconductance
Output Source (Vref + 0.2 V)
Output Sink (Vref − 0.2 V)
Boost Current (Vref = 2.5 V nominal)
Source Boost Current Threshold
Sink Boost Current Threshold
Source Boost Current (1.3 X Vref)
Sink Boost Current
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 mA) (TJ = 25°C)
AC Inverting Input Clamp Voltage (250 mA) (TJ = −40°C to +125°C)
Gain from ACcomp to PWM+ (Av = VPWM+ / (VACcomp – Voffset)) (Note 3)
CURRENT SENSE AMPLIFIER
Input Bias Current (Pin 11)
Differential Input Voltage Range (Note 3)
Input Offset Voltage
Output Gain (150 mA/0.150 V) (Voltage Loop Outputs) (Note 3)
VIO
gm
IOsource
IOsink
−
20
−
mV
60
100
150
umho
10
20
−
mA
−10
−20
−
mA
Vfb(boost+)
−
1.175
−
V/V
Vfb(boost−)
−
0.825
−
V/V
I(boost+)
150
250
−
mA
I(boost−)
−150 −285
−
mA
VIO
gm
IOsource
IOsink
Vclamp
Vclamp
AV
−
20
−
mV
60
100
150
umho
25
70
−
mA
−25
−70
−
mA
4.30 4.45 4.60
V
3.70
−
4.60
V
−
2.0
−
V/V
Ibias
VIdiff
VIO
Av
−40
−50
−80
−
−0.20
−
0
2.5
5.0
−
1000
−
mA
V
mV
umho
Output Gain (150 mA/0.150 V) (Max Pwr Output) (R10 = 15 kW) (Note 3)
Bandwidth (Note 3)
PWM Output Voltage Gain (k = VPWM+ / Vsense−) (Pin 13 = Open)
(TJ = −40°C to + 125°C)
Current Limit Voltage Gain (k = Vace/a / Vsense−) (Vpin5 = 0, R10 = 15 k)
Power Output Voltage Gain (k = Vpin10 / Vsense−) (TJ = −40°C to + 125°C)
Current Limit Threshold (Vpin5 = 0, Pin 13 = Open)
Current Limit Delay (0 to –450 mV Step) (Note 3)
REFERENCE MULTIPLIER
Dynamic Input Voltage Range
Ac Input (p−input) (Note 3)
Compensation Input (a−input) (Note 3)
Offset Voltage (a−input)
Av
funity
Av
Av
k
ILIMthr
ILIMdelay
Vmax
−
1000
−
−
1.5
−
12.9
15
17
13
15
17
13.4
15
17
225
270
315
−
300
−
umho
MHz
V/V
V/V
V/V
mV
nS
V
−
3.75
−
−
−
−
−
1.0
−
Multiplier Gain
(Note 3)
k
+
(VACńVramp
pk)
Vmult out
(VLOOPcomp
* Voffset)
3. Verified by design.
k
−
8.0
−
1.0/V
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