NCP3063: Cigarette Lighter Adapter (CLA)

DN06042/D
Design Note – DN06042/D
Self Protecting
Cigarette Lighter Adapter (CLA)
Device
Application
Input Voltage
Output Power
Topology
I/O Isolation
NCP3063
Consumer/Industrial
8-24 V
4W
Buck
None
Characteristic
Output Voltage
Output Current
Oscillator Frequency
Output Voltage Ripple
Calculated Inductor peak Current (390 uH)
Calculated Duty Cycle
Load Regulation
Iout = 0.04-1A)
Line regulation to 5V
Iout = 1A)
Iout = 0.25A)
CLA Converter Dimensions in inches (mm)
Min
4.98
0
Max
5.03
1
12
.83
24
Typ
5.01
0.8
53
32
.86
50
80
.89
78
Unit
V
A
kHz
mVpk-pk
A
%
2
13
27
mV/A
-1.5
.2
1.4
%
0.7
1.8 2.66
.686(17.4) x 2.754 (70)
Circuit Description
The NCP3063 is a hysteretic regulator with pulse by pulse current limiting and frequency adjustment.
The NCP3063 CLA (Cigarette Lighter Adapter) design is configured in a buck topology and the
frequency has been set to 53 kHz to reduce switching losses. The DFN package was selected as the
exposed pad on the bottom spreads heat to the ground plane and grounding clip. The CLA has several
built in safety features the first of which is a fuse F1 shown in layout in Figure 1 and schematically in
Figure 3. The fuse serves as a second layer of short circuit protection incase the main switch is shorted.
The fuse also serves as reverse polarity protection in the event that positive and negative voltages are
reversed on the input. If the opposite polarity is applied at the input the diode D2 starts to conduct and
the fuse F1 is blown protecting the end users device and the rest of the CLA. The designer can choose
to implement a user replaceable fuse or a one time protection device depending on the user case. The
first layer of short circuit protection is the pulse by pulse current limiting provided by the NCP3063 which
can be set by the sense resistor R5. The user interface indicator R9 and D3 give real time visual
feedback to the customer as to the functionality of the adapter. If a short circuit was to occur at the
output or the fuse was to blown the LED D3 will cease to illuminate.
Existing Product
MC34063 SOIC-8
FET
DPAK
New Product
NCP3063
DFN (4x4mm)
New Thermally Enhanced Package Eliminates Need for External FET
Rev 0 - April, 2008
DN06042/D
Board Details
Figure 1 – NCP3063 CLA Top Layout and Silkscreen
Figure 2 – NCP3063 Bottom Layout and Silkscreen
Rev 0 - April, 2008
DN06042/D
Schematic
Figure 3 – NCP3063 Schematic
Rev 0 - April, 2008
DN06042/D
Table 1 – NCP3063 CLA Bill of Materials
Designator
Quantity
Description
Value
Tolerance
Footprint
Manufacturer
Part Number
Manufacturer
D1-2
C2
CT
CR1-2
C3
CO2
CIN1
D3
U1
R4 R7-8
R5
R9
R2
F1
R1
R3 R10
L1
2
1
1
2
1
1
1
1
1
3
1
1
1
1
1
2
1
40 V Schottky
Ceramic Capacitor 6.3V
Ceramic Capacitor 6.3V
Ceramic Capacitor 35V
Ceramic Capacitor 35V
AE Capacitors 16V
AE Capacitors 10V
Green LED
1.5 A Switching Regulator
Jumper
TH Resistor
SMT Resistor
SMT Resistor
Fast Acting Fuse
SMT Resistor
SMT Resistor
Inductor 0.4 Ohm
0.60 Vf
1μF
6.8n
NI
1 μF
1000 μF
330 μF
2mA 1.9V
40 V 1.5A
Jumper
0.1
1.62k
2.55k
2A
7.68k
NI
430 μH
59-10
603
603
603
1206
Through Hole
Through Hole
Through Hole
SOIC-8
.4in th
Through Hole
0603
0603
0603
0603
0603
Through Hole
1N5819RLG
06036D106MAT2A
VJ0603Y682KXACW1BC
NI
1206DD105KAT2A
ESMG100ELL102ME11D
ESMG350ELL331MJC5S
LG 3369-EJ-1-0-2-BULK
NCP3063BDR2G
923345-04-C
13FR100E
CRCW06031K62JNEA
CRCW06032K55FKEA
0467002.NR
CRCW06037K68FKEA
NA
IN08014
ON Semiconductor
AVX Corporation
Vishay
NI
AVX Corporation
United Chemi-Con
United Chemi-Con
Osram
ON Semiconductor
3M
Ohmite
Vishay / Dale
Vishay / Dale
Littelfuse Inc
Vishay / Dale
NA
ICE
L1
1
Inductor 0.62 Ohm
NA
20%
10%
NI
10%
20%
20%
NA
NA
NA
1%
±5.0%
±1.0%
a^2s – 0.1105
±1.0%
NA
10%
10
%
Through Hole
RFB1010-391L
Coilcraft
390 μH
Rev 0 - April, 2008
DN06042/D
Block Diagram – NCP3063
Figure 4 – NCP3063 Block Diagram
Table 2 – NCP3063 Pin Description
Rev 0 - April, 2008
DN06042/D
Performance Information
The following Figures show typical performance of the NCP3063 CLA evaluation board.
85%
Efficiency (%)
80%
8V
75%
70%
65%
12V
60%
55%
50%
24 V
45%
40%
0.04
0.24
0.44
0.64
0.84
Iout (A)
Figure 5– NCP3063 Efficiency 8V-24V with at 5V output Voltage.
5.03
5.025
8
5.02
Vout (v)
5.015
12
5.01
5.005
16
5
4.995
20
4.99
4.985
24
4.98
0.25
0.35
0.45
0.55
0.65
0.75
0.85
Iout (A)
Figure 6 – NCP3063 Load Regulation
Rev 0 - April, 2008
0.95
DN06042/D
3.0%
8
2.5%
2.0%
12
Error (%)
1.5%
1.0%
16
0.5%
0.0%
0.25
-0.5%
0.35
0.45
0.55
0.65
0.75
0.85
0.95
20
-1.0%
24
-1.5%
-2.0%
Iout (A)
Figure 7 - NCP3063 Load Regulation Error
5.03
Output Voltage (V)
5.025
0.25
5.02
5.015
0.5
5.01
5.005
5
0.75
4.995
4.99
1
4.985
4.98
8
10
12
14
16
18
20
VIN (V)
Figure 8 - NCP3063 Line Regulation
Rev 0 - April, 2008
22
24
DN06042/D
3.0%
2.5%
0.25
2.0%
Error (%)
1.5%
0.5
1.0%
0.5%
0.0%
-0.5%
8
10
12
14
16
18
20
22
24
0.75
-1.0%
1
-1.5%
-2.0%
VIN (V)
Figure 9 - NCP3063 Line Regulation Error
Rev 0 - April, 2008
DN06042/D
Figure 10- NCP3063 Output Ripple at 24 V to 5 V at a 1 A Load
Figure 11- NCP3063 Output Ripple at 24 V to 5 V at a no load
Rev 0 - April, 2008
DN06042/D
Figure 12- NCP3063 Output Ripple at 8 V to 5 V at a 1 A Load
Figure 13- NCP3063 Output Ripple at 8 V to 5 V at a no load
Rev 0 - April, 2008
DN06042/D
© 2008 ON Semiconductor.
Disclaimer: ON Semiconductor is providing this design note “AS IS” and does not assume any liability arising from its use; nor
does ON Semiconductor convey any license to its or any third party’s intellectual property rights. This document is provided only to
assist customers in evaluation of the referenced circuit implementation and the recipient assumes all liability and risk associated
with its use, including, but not limited to, compliance with all regulatory standards. ON Semiconductor may change any of its
products at any time, without notice.
Design note created by Bryan McCoy and Tim Kaske, e-mail: [email protected]; [email protected]
Rev 0 - April, 2008