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NCP3063DFBSTGEVB

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
NCP3063, NCP3063B, NCV3063
http://onsemi.com
13
Figure 25. Typical Boost Application Schematic with External NMOS Transistor
IC1 NCP3063
5
36
4
8
7
1
2
R4
V
IN
= 8 − 18 V/0.6 A
V
OUT
= 31 V/0.35 A
+
COMP
TC
GND
N.C. SWC
SWE
V
CC
I
PK
1k
1N5819
D1
R3
M18
C2
100n
C1
0V GND
C6
100n
C7
R8
1k
C4
1n2
C5 6n8
R7
470
R5 24k
C3 10n
R2 1k
R1 82m
10m
L1
6
2
5
1
4
3
G
D
S
Q1
NTD18N06
IC2 BC846BPD
330m 330m
Figure 26. Typical Efficiency for Application
Shown in Figure 25.
70
72
74
76
78
80
82
84
86
6 8 10 12 14 16 18 20
70
72
74
76
78
80
82
84
86
6 8 10 12 14 16 18 20
EFFICIENCY (%)
INPUT VOLTAGE (V)
I
LOAD
= 350 mA
External transistor is recommended in applications where
wide input voltage ranges and higher power is required. The
suitable schematic with an additional NMOS transistor and
its driving circuit is shown in the Figure 25. The driving
circuit is controlled from SWE Pin of the NCP3063 through
frequency compensated resistor divider R7/R8. The driver
IC2 is ON Semiconductor low cost dual NPN/PNP
transistor BC846BPD. Its NPN transistor is connected as a
super diode for charging the gate capacitance. The PNP
transistor works as an emitter follower for discharging the
gate capacitor. This configuration assures sharp driving
edge between 50 − 100 ns as well as it limits power
consumption of R7/R8 divider down to 50 mW. The output
current limit is balanced by resistor R3. The fast switching
with low R
DS(on)
NMOS transistor will achieve efficiencies
up to 85% in automotive applications.
NCP3063, NCP3063B, NCV3063
http://onsemi.com
14
Figure 27. Typical Buck Application Schematic with External PMOS Transistor
IC1 NCP3063
5
36
4
8
7
1
2
R3
V
IN
= 8 − 19 V
V
OUT
= 3V3/3 A
+
COMP
TC
GND
N.C. SWC
SWE
V
CC
I
PK
1k
C2
100n
C1
0V GND
C6
100n
C7
R8
470
C5
2n2
R6
22k
R2 1k7
R1 50m
10m
L1
6
1
Q2
NTGS4111P
C4
6n8
R5
1k
D1
1N5822
+
4
3
2
5
T1
BC848CPD
330m 330m
60
65
70
75
80
85
90
95
100
0 0.5 1 1.5 2 2.5
3
Figure 28. NCP3063 Efficiency vs. Output Current for
Buck External PMOS at V
out
= 3.3 V, f = 220 kHz,
T
A
= 255C
EFFICIENCY (%)
OUTPUT LOAD (Adc)
V
IN
= 8 V
V
IN
= 18 V
Figure 27 shows typical buck configuration with external
PMOS transistor. The principle of driving the Q2 gate is the
same as shown in Figure 27.
Resistor R6 connected between TC and SWE pin provides
a pulsed feedback voltage. It is recommended to use this
pulsed feedback approach on applications with a wide input
voltage range, applications with the input voltage over
+12 V or applications with tighter specifications on output
ripple. The suitable value of resistor R6 is between
10k − 68k. The pulse feedback approach increases the
operating frequency by about 20%. It also creates more
regular switching waveforms with constant operating
frequency which results in lower output ripple voltage and
improved efficiency.
The pulse feedback resistor value has to be selected so that
the capacitor charge and discharge currents as listed in the
electrical characteristic table, are not exceeded. Improper
selection will lead to errors in the oscillator operation. The
maximum voltage at the TC Pin cannot exceed 1.4 V when
implementing pulse feedback.
NCP3063, NCP3063B, NCV3063
http://onsemi.com
15
Figure 29. Typical Buck Application Schematic with External Low V
CE
(sat) PNP Transistor
IC1 NCP3063
5
36
4
8
7
1
2
R2
V
IN
= 8 − 19 V
V
OUT
= 3V3/1 A
+
COMP
TC
GND
N.C. SWC
SWE
V
CC
I
PK
1k
C2
100n
C1
0V GND
C5
100n
C6
C3
2n2
R5
33
R3 1k7
R1
150m
33m
L1
Q1 NSS35200
D2
NSR0130
+
R4
33
D1
1N5819
100m100m
50
55
60
65
70
75
80
85
90
95
100
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Figure 30. NCP3063 Efficiency vs. Output Current for
External Low V
CE(sat)
at V
in
= +5 V, f = 160 kHz,
T
A
= 255C
EFFICIENCY (%)
OUTPUT LOAD (Adc)
Typical application of the buck converter with external
bipolar transistor is shown in the Figure 29. It is an ideal
solution for configurations where the input and output
voltage difference is small and high efficiency is required.
NSS35200, the low V
CE
(
sat)
transistor from
ON Semiconductor will be ideal for applications with 1 A
output current, the input voltages up to 15 V and operating
frequency 100 − 150 kHz. The switching speed could be
improved by using desaturation diode D2.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

NCP3063DFBSTGEVB

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Manufacturer:
ON Semiconductor
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