ncp3155a ON Semiconductor, ncp3155a Datasheet - Page 4

• Manufacturer Part Number: ncp3155a
• Description: Ncp3155a, Ncp3155b 3 A Synchronous Buck Regulator
• Manufacturer: ON Semiconductor

ELECTRICAL CHARACTERISTICS (
SUPPLY CURRENT
UNDER VOLTAGE LOCKOUT
OSCILLATOR
PWM
ERROR AMPLIFIER (GM)
OUTPUT VOLTAGE FAULTS
PWM OUTPUT STAGE
OVERCURRENT
THERMAL SHUTDOWN
4. Guaranteed by design.
5. The voltage sensed across the high side MOSFET during conduction.
6. This assumes 100 pF capacitance to ground on the COMP Pin and a typical internal R
7. This is not a protection feature.
Input Voltage Range
V
V
UVLO Rising Threshold
UVLO Falling Threshold
Oscillator Frequency
Oscillator Frequency
Ramp−Amplitude Voltage
Ramp Valley Voltage
Minimum Duty Cycle
Maximum Duty Cycle
Soft Start Ramp Time
Transconductance
Open Loop dc Gain
Output Source Current
Output Sink Current
FB Input Bias Current
Feedback Voltage
COMP High Voltage
COMP Low Voltage
Feedback OOV Threshold
Feedback OUV Threshold
High−Side Switch On Resistance
Low−Side Switch On Resistance
ISET Source Current
Current Limit Set Voltage (Note 5)
Thermal Shutdown
Hysteresis
CC
CC
Supply Current
Supply Current
Characteristic
NCP3155A
NCP3155B
NCP3155A
NCP3155B
NCP3155A
NCP3155B
T
T
−40°C < T
J
J
4.7 V < V
= −40°C to +125°C, 4.7 V v V
= −40°C to +125°C, 4.7 V v V
V
V
V
V
T
T
FB
FB
FB
FB
J
J
= +25°C, 4.7 V v V
= +25°C, 4.7 V v V
= 0.8 V, Switching, V
= 0.8 V, Switching, V
= 0.8 V, Switching, V
= 0.8 V, Switching, V
IN
J
< +125°C, V
V
< 28 V, −40°C < T
V
R
(Notes 4 and 6)
(Notes 4 and 7)
(Notes 4 and 7)
CC
V
V
V
V
CC
V
V
SET
http://onsemi.com
Conditions
FB
FB
FB
FB
V
V
FB
V
V
peak
TJ = 25 C
(Note 4)
IN
IN
Falling Edge
Rising Edge
IN
IN
= 750 mV
= 850 mV
= 750 mV
= 850 mV
= V
= 22.1 kW
= 4.7 V
= 4.7 V
= 12 V
= 12 V
−
− V
COMP
CC
alley
4
CC
CC
= 12 V, for min/max values unless otherwise noted)
CC
CC
CC
CC
v 28 V
v 28 V
J
= 4.7 V
= 4.7 V
= 24 V
< +125°C
= 24 V
CC
CC
v 28 V
v 28 V
o
of > 10 MW.
0.792
0.784
0.46
0.91
0.56
Min
415
400
830
820
4.7
4.0
3.5
0.9
4.0
80
45
45
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
7
−
−
−
1000
1000
31.5
16.5
54.7
0.71
1.00
0.60
13.5
11.1
Typ
500
500
298
175
4.3
3.9
1.5
7.0
2.4
1.2
1.3
0.5
0.8
0.8
4.4
84
70
70
70
72
48
65
18
21
20
0.808
0.816
1170
1180
Max
0.85
1.09
0.64
585
600
100
100
500
250
4.7
4.3
1.9
5.0
24
63
85
35
50
18
−
−
−
−
−
−
−
−
−
−
−
−
−
Unit
kHz
kHz
kHz
kHz
mW
mW
mA
mA
mA
mA
mS
mV
mV
ms
dB
mA
mA
nA
mA
°C
°C
%
%
V
V
V
V
V
V
V
V
V
V