NCP1546
ELECTRICAL CHARACTERISTICS
(0°C < T
J
< 70°C, 4.5 V< V
IN
< 40 V; unless otherwise specified.)
Characteristic
Oscillator
Operating Frequency
Frequency Line Regulation
Maximum Duty Cycle
V
FB
Frequency Foldback Threshold
PWM Comparator
Slope Compensation Voltage
Minimum Output Pulse Width
Power Switch
Current Limit
Foldback Current
Saturation Voltage
Current Limit Delay
Error Amplifier
Internal Reference Voltage
Reference PSRR
FB Input Bias Current
Output Source Current
Output Sink Current
Output High Voltage
Output Low Voltage
Unity Gain Bandwidth
Open Loop Amplifier Gain
Amplifier Transconductance
Sync
Sync Frequency Range
Sync Pin Bias Current
Sync Threshold Voltage
Shutdown
Shutdown Threshold Voltage
Shutdown Pin Bias Current
Thermal Shutdown
Overtemperature Trip Point
Thermal Shutdown Hysteresis
Note 3
Note 3
175
−
185
42
195
−
°C
°C
V
SHDNB
= 0 V
−
1.0
0.14
1.3
5.00
1.6
35
V
mA
V
SYNC
= 5.0 V
−
−
190
−
0.9
−
360
1.5
355
485
1.9
kHz
mA
V
Note 3
−
V
C
= 1.270 V, V
FB
= 1.0 V
V
C
= 1.270 V, V
FB
= 2.0 V
V
FB
= 1.0 V
V
FB
= 2.0 V
Note 3
Note 3
Note 3
−
1.244
−
−
15
15
1.39
5.0
−
−
−
1.270
40
0.02
25
25
1.46
20
500
70
6.4
1.296
−
0.1
35
35
1.53
60
−
−
−
V
dB
mA
mA
mA
V
mV
kHz
dB
mA/V
V
FB
> 0.36 V
V
FB
< 0.29 V
I
OUT
= 1.5 A, V
BOOST
= V
IN
+ 2.5 V
Note 3
1.6
0.9
0.4
−
2.3
1.5
0.7
120
3.0
2.1
1.0
160
A
A
V
ns
Fix V
FB,
DV
C
/DT
ON
V
FB
to V
SW
5.0
−
9.0
100
17
200
mV/ms
ns
−
−
−
−
153
−
85
0.29
170
0.05
90
0.32
187
0.15
95
0.36
kHz
%/V
%
V
Test Conditions
Min
Typ
Max
Unit
3. Guaranteed by design, not 100% tested in production.
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