NCV5171
ELECTRICAL CHARACTERISTICS (2.7 V< V < 30 V; −40°C < T < 125°C unless otherwise stated.)
CC
J
Characteristic
Test Conditions
Min
Typ
Max
Unit
Positive and Negative Error Amplifiers
FB Reference Voltage
V
tied to FB; measure at FB
1.246
−1.0
−
1.276
0.1
1.300
1.0
V
C
FB Input Current
FB = V
mA
REF
FB Reference Voltage Line Regulation
V
= FB
0.01
0.03
%/V
C
Positive Error Amp Transconductance
Positive Error Amp Gain
I
=
25 mA
300
200
25
550
500
50
800
−
mMho
V/V
mA
mA
V
VC
(Note 2)
FB = 1.0 V, V = 1.25 V
V
V
V
V
V
Source Current
Sink Current
90
C
C
C
C
C
C
FB = 1.5 V, V = 1.25 V
200
1.5
625
1.7
1500
1.9
C
High Clamp Voltage
Low Clamp Voltage
Threshold
FB = 1.0 V; V sources 25 mA
C
FB = 1.5 V; V sinks 25 mA
0.25
0.6
0.50
1.05
0.65
1.30
V
C
Reduce V from 1.5 V until switching stops
V
C
Oscillator
Base Operating Frequency
FB = 1 V
FB = 0 V
230
30
280
52
310
120
−
kHz
kHz
%
Reduced Operating Frequency
Maximum Duty Cycle
90
94
Base Operating Frequency
Reduced Operating Frequency
FB Frequency Shift Threshold
FB = 1 V
460
60
560
104
0.40
620
160
0.44
kHz
kHz
V
FB = 0 V
Frequency drops to reduced operating frequency
0.36
Sync/ Shutdown
Sync Range
320
2.5
−
−
500
−
kHz
V
Sync Pulse Transition Threshold
SS Bias Current
Rise time = 20 ns
SS = 0 V
SS = 3.0 V
−15
−
−3.0
3.0
−
mA
mA
8.0
Shutdown Threshold
Shutdown Delay
−
0.40
0.85
1.20
V
2.7 V ≤ V ≤ 12 V
12
12
80
36
350
200
ms
ms
CC
12 V < V ≤ 30 V
CC
2. Guaranteed by design, not 100% tested in production.
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