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NCP3163BMNR2G

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
NCP3163, NCV3163
http://onsemi.com
10
When configured for step−down or voltage−inverting
applications (see application notes at the end of this
document) the inductor will forward bias the output rectifier
when the switch turns off. Rectifiers with a high forward
voltage drop or long turn−on delay time should not be used.
If the emitter is allowed to go sufficiently negative, collector
current will flow, causing additional device heating and
reduced conversion efficiency.
Figure 12 shows that by clamping the emitter to 0.5 V, the
collector current will be in the range 10 mA over
temperature. A 1N5822 or equivalent Schottky barrier
rectifier is recommended to fulfill these requirements.
A bootstrap input is provided to reduce the output switch
saturation voltage in step−down and voltage−inverting
converter applications. This input is connected through a
series resistor and capacitor to the switch emitter and is used
to raise the internal 2.0 mA bias current source above V
CC
.
An internal zener limits the bootstrap input voltage to V
CC
+7.0 V. The capacitor’s equivalent series resistance must
limit the zener current to less than 100 mA. An additional
series resistor may be required when using tantalum or other
low ESR capacitors. The equation below is used to calculate
a minimum value bootstrap capacitor based on a minimum
zener voltage and an upper limit current source.
C
B(min)
+ I
Dt
DV
+ 4.0 mA
t
on
4.0 V
+ 0.001 t
on
Parametric operation of the NCP3163 is guaranteed over
a supply voltage range of 2.5 V to 40 V. When operating
below 3.0 V, the Bootstrap Input should be connected to
V
CC
. Figure 18 shows that functional operation down to
1.7 V at room temperature is possible.
Package
The NCP3163 is contained in a heatsinkable 16−lead
plastic package in which the die is mounted on a special heat
tab copper alloy pad. This pad is designed to be soldered
directly to a GND connection on the printed circuit board to
improve thermal conduction. Since this pad directly
contacts the substrate of the die, it is important that this pad
be always soldered to GND, even if surface mount heat
sinking is not being used. Figure 21 shows recommended
layout techniques for this package.
Figure 21. Layout Guidelines to Obtain Maximum
Package Power Dissipation
Flare Metal for Maximum Heat Sinking
0.145
0.175
Exposed Pad
0.188
Vias to 2nd Layer Metal
for Maximum Heat Sinking
Minimum
Recommended
Exposed Copper
APPLICATIONS
Figures 23 through 30 show the simplicity and flexibility
of the NCP3163. Three main converter topologies are
demonstrated with actual test data shown below each of the
circuit diagrams. Figure 22 gives the relevant design
equations for the key parameters. Additionally, a complete
application design aid for the NCP3163 can be found at
www.onsemi.com.
NCP3163, NCV3163
http://onsemi.com
11
Calculation
Step−Down Step−Up Voltage−Inverting
t
on
t
off
(See Notes 1,2,3)
V
out
) V
F
V
in
* V
sat
* V
out
V
out
) V
F
V
in
V
in
V
sat
|V
out
| ) V
F
V
in
* V
sat
t
on
ƒ
t
on
t
off
ǒ
t
on
t
off
) 1
Ǔ
ƒ
t
on
t
off
ǒ
t
on
t
off
) 1
Ǔ
ƒ
t
on
t
off
ǒ
t
on
t
off
) 1
Ǔ
C
T
32.143 · 10
*6
f
* 20 @ 10
*12
32.143 · 10
*6
f
* 20 @ 10
*12
32.143 · 10
*6
f
* 20 @ 10
*12
I
L(avg)
I
out
I
out
ǒ
t
on
t
off
) 1
Ǔ
I
out
ǒ
t
on
t
off
) 1
Ǔ
I
pk (Switch)
I
L(avg)
)
DI
L
2
I
L(avg)
)
DI
L
2
I
L(avg)
)
DI
L
2
R
SC
0.25
I
pk (Switch)
0.25
I
pk (Switch)
0.25
I
pk (Switch)
L
ǒ
V
in
* V
sat
* V
out
DI
L
Ǔt
on
ǒ
V
in
* V
sat
DI
L
Ǔt
on
ǒ
V
in
* V
sat
DI
L
Ǔt
on
V
ripple(pp)
ƒ
DI
L
ǒ
1
8C
O
Ǔ
2
) (ESR)
2
[
t
on
I
out
C
O
[
t
on
I
out
C
O
V
out
V
ref
ǒ
R
2
R
1
) 1
Ǔ
V
ref
ǒ
R
2
R
1
) 1
Ǔ
V
ref
ǒ
R
2
R
1
) 1
Ǔ
V
in
−
V
out
−
I
out
−
DI
L
−
p −
V
ripple(pp)
−
Nominal operating input voltage.
Desired output voltage.
Desired output current.
Desired peak−to−peak inductor ripple current. For maximum output current it is suggested that
DI
L
be chosen to be less
than 10% of the average inductor current I
L(avg)
. This will help prevent I
pk
(Switch)
from reaching the current limit
threshold set by R
SC
. If the design goal is to use a minimum inductance value, let DI
L
= 2(I
L(avg)
). This will
proportionally reduce converter output current capability.
Maximum output switch frequency.
Desired peak−to−peak output ripple voltage. For best performance the ripple voltage should be kept to a low value
since it will directly affect line and load regulation. Capacitor C
O
should be a low equivalent series resistance (ESR)
electrolytic designed for switching regulator applications.
The following Converter Characteristics must be chosen:
NOTES: 1. V
sat
− Saturation voltage of the output switch, refer to Figures 10 and 11.
NOTES: 2. V
F
− Output rectifier forward voltage drop. Typical value for 1N5822 Schottky barrier rectifier is 0.5 V.
NOTES: 3. The calculated t
on
/t
off
must not exceed the minimum guaranteed oscillator charge to discharge ratio of 8, at the minimum
NOTES: 3. operating input voltage.
Figure 22. Design Equations
NCP3163, NCV3163
http://onsemi.com
12
R
B
L
D
LVI
1
+
+
-
Current
Limit
8
7
6
5
4
3
2
(Bottom View)
+
+
-
16
9
10
11
12
13
14
15
0.25 V
R
SC
V
in
C
T
1.125 V
15 k1.25 V
45 k
Feedback
Comparator
Q
1
Q
2
60
C
in
C
O
C
B
V
out
-
+
Thermal
Oscillator
R
S
Q
Latch
2.0 mA
7.0 V
Figure 23. Typical Buck Application Schematic
V
CC
V
CC
V
CC
R
1
R
2
R
T
Value of Components
Name Value
L
47 mH
D 2 A, 40 V Schottky Rectifier
C
in
47 mF, 35 V
C
out
100 mF, 10 V
C
t
270 pF ±10%
R
t
15 kW
Name Value
R
1
15 kW
R
2
24.9 kW
R
sc
80 mW, 1 W
C
b
4.7 nF
R
b
200 W
Test Results for V
out
= 3.3 V
Test Condition Results
Line Regulation V
in
= 8.0 V to 24 V, I
out
= 2.5 A 13 mV
Load Regulation V
in
= 12 V, I
out
= 0 to 2.5 A 25 mV
Output Ripple V
in
= 12 V, I
out
= 0 to 2.5 A 100 mVpp
Efficiency V
in
= 12 V, I
out
= 2.5 A 70.3%
Short Circuit Current
V
in
= 12 V, R
L
= 0.1 W
3.1 A
Test Results for V
out
= 5.05 V
Test Condition Results
Line Regulation V
in
= 10.2 V to 24 V, I
out
= 2.5 A 54 mV
Load Regulation V
in
= 12 V, I
out
= 0 to 2.5 A 28 mV
Output Ripple V
in
= 12 V, I
out
= 0 to 2.5 A 150 mVpp
Efficiency V
in
= 12 V, I
out
= 2.5 A 75.5%
Short Circuit Current
V
in
= 12 V, R
L
= 0.1 W
3.1 A
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

NCP3163BMNR2G

Mfr. #:
Buy NCP3163BMNR2G
Manufacturer:
ON Semiconductor
Description:
Switching Voltage Regulators DFN 18EG 5X6X.9MM
Lifecycle:
New from this manufacturer.
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