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EVBUM2356/D
NCP1034 Buck Converter
Evaluation Board User's
Manual
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EVAL BOARD USER’S MANUAL
Table 1. GENERAL PARAMETERS
Device
Input Voltage
Output Voltage
Output Current
Voltage Ripple
Topology
I/O Isolation
NCP1034
48 V ±20%
5V
5A
< 30 mV
Buck
None
Key Features
Description
This evaluation board user’s manual describes high voltage, high
power and high efficiency DC/DC buck converter featuring the
NCP1034.
The NCP1034 is voltage mode PWM controller for a high voltage
synchronous buck. The controller drives two external N-MOSFETs
with programmable frequency up to 500 kHz for wide applications
range. The IC is able to be synchronized by external signal or is able to
synchronize other ICs that simplify design of system level filter.
The output voltage can be set as low as 1.25 V. Besides system and
drivers UVLO there is an external UVLO that can be set to user value.
Over current protection uses low side MOSFET RDSON as sensing
resistor, which has no impact on efficiency. Current limit protection
uses a hiccup mode. These protections provide application additional
security level.
•
•
•
•
•
•
•
•
•
High Input Voltage
High Operation Frequency
High Efficiency
Low Output Voltage Ripple
Ceramic Capacitors Only
Over-current Protection
Under-voltage Protection
Start to Pre-biased Output
Small Size
Connection Diagram
−
+
Shut
Down
Power
Supply: 48 V
±20%
+
+
Load: 5 V
<5A
−
−
−
+
Ext.
Sync
Signal
Figure 1. Connection Diagram
© Semiconductor Components Industries, LLC, 2016
January, 2016 − Rev. 2
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Publication Order Number:
EVBUM2356/D
Figure 2. Schematic of the NCP1034 Demo Board
C3
100 nF
R12A
0W
R12B
NU
14
1
16
4
15
5
12
R13
0W
GND
R7, 10 kW
GND GND GND GND
C10
100 nF
MMSZ4699
GND GND
GND
JP1−1
2
1
GND
SS/SD
JP1−2
4
3
R5, 3.9 kW
D2
R10, 10 kW
SYNC
GND GND
R4
110 kW
R11E, 12 kW
R11D, 12 kW
GND
C5, 220 nF
COMP
FB
PGND
LDRV
OCIN
VS
HDRV
D1
1N4148
IO1
NCP1034SMD
GND
OCSET
UVLO
SS/SD
RT
SYNC
VCC
C2
100 nF
C11
NU
8
DRVVCC
R11C, 12 kW
R6, 20 kW
9
VB
3
2
6
7
13
11
10
C6
12 nF
C7
330 pF
R3
4.7 kW
R8
10 kW
C12
NU
C4
100 nF
R14A
NU
R14B
0W
Q3
NTD24N06
L1
13 mH
Q2
NTD3055
2.2 mF 2.2 mF NU
C1C
C9B, 4.7 mF
GND
C9D, NU
R15
0W
NU
C1D
+
C1B
C9C, 4.7 mF
C1A
NU
C1E
+
R11B, 12 kW
NU
C1F
GND
C9E, NU
Q1
NU
C9A, 4.7 mF
GND
48 V ±20%
R9
1.2 kW
R11A, 12 kW
R1, 16.9 kW
R2
5.6 kW
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C8
1.8 nF
2
X2−2
X1−2
X1−1
X2−1
5 V @ 5 A,
200 kHz
GND
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Schematic
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surface mounted types and almost all of them are on the top
layer. On the bottom side there are power MOSFETs
because it can be easy put on cooler (if demo board is used
on prescribed operations conditions and at room
temperature it is not needed).
Some components must be placed very carefully.
Blocking capacitors C2, C3 and bootstrap capacitor C4 have
to be placed close to the IC. Low side MOSFET’s source
have to be connected to the IC’s power ground with
minimum resistance and inductance of connection so two
layers connection between them is needed. Feedback and
compensation network should be near the IC to minimize
noise on them. Using signal and power ground connected in
one point near the output connector improves load
regulation. Inductor and output capacitors are placed close
to the MOSFETs and output connector.
The demo board was designed as board with many
options. There is linear regulator for powering the IC only
with Zener diode or with high voltage transistor (R12A and
R12B selected one of these regulators), compensation
circuit of second or third type (R14A and R14B), ceramic or
electrolytic output capacitors (C9A–C9E) and various input
capacity (C1A–C1F). For additional filtering there are R13
and C11 which is not currently used. There are two headers
pins for easy connection to external synchronization pulse
source or to direct connection to the other NCP1034 demo
board and the SS/SD pin that can be used to shut down the
controller by connecting it to the ground.
Circuit Layout
Circuit is designed on two layer FR4 board with 72 mm
copper cladding. Except connectors all components are
Figure 3. Top Layer
Figure 4. Bottom Layer
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Figure 5. Top Side Components
70 mm
Figure 6. Bottom Side Components
44 mm
Figure 7. Demo Board Photos
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Measurement
Table 2. OUTPUT PARAMETERS
Characteristic
Output Voltage
Maximum Output Current
Oscillator Frequency
Typ
Unit
5.02
V
5
A
200
Output Voltage Ripple
IOUT = 0.1 A
IOUT = 5 A
16.5
20.5
Load Regulation
IOUT = 0−5 A, VIN = 48 A
−0.34
kHz
mVpk−pk
mV/A
Line Regulation
VIN = 38−58 A
IOUT = 0.1 A
IOUT = 5 A
%
0.004
0.011
Start Up Sequence
Output Voltage
SS Voltage
Figure 8. Start to Nominal Load
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Output Current
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Output Voltage
SS Voltage
Output Current
Figure 9. Start to Light Load
Output Voltage
SS Voltage
Bridge Voltage
Figure 10. Start to Pre-Biased Output
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Output Current
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Over-Current Protection
Output Voltage
SS Voltage
Bridge Voltage
Inductor Current
Figure 11. Shorted Output and Release
Output Voltage
SS Voltage
Bridge Voltage
Figure 12. Overload from Nominal Load and Released
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Inductor Current
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Output Voltage
SS Voltage
Bridge Voltage
Inductor Current
Figure 13. Hicup Pulse Detail
Shutdown
Output Voltage
SS Voltage
Input Voltage
Figure 14. Switch Off Input Voltage to Light Load
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Output Current
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Output Voltage
SS Voltage
Input Voltage
Output Current
Figure 15. Switch Off Input Voltage to Nominal Load
Output Voltage
SS Voltage
Input Voltage
Figure 16. Shut Down through SS/SD Pin
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Output Current
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Step Response and Output Voltage Ripple
Output Voltage
Bridge Voltage
Output Current
Figure 17. Load Step Response
Output Voltage
Bridge Voltage
Inductor Current
Figure 18. Output Voltage Ripple IOUT = 5 A
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Output Voltage
Bridge Voltage
Inductor Current
Figure 19. Output Voltage Ripple IOUT = 0.1 A
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Synchronization
Two independent boards connected (or not) via Sync pin
and ground.
First Demoboard Sync Pin Voltage
First Demoboard Bridge Voltage
Second Demoboard Sync Pin Voltage
Second Demoboard Bridge Voltage
Figure 20. No Synchronization
First Demoboard Sync Pin Voltage
First Demoboard Bridge Voltage
Second Demoboard Sync Pin Voltage
Second Demoboard Bridge Voltage
Figure 21. Synchronized − Sync Pins Connected
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Line and Load Regulation
5.035
IOUT = 5 A
IOUT = 0.1 A
5.030
VOUT (V)
5.025
5.020
5.015
5.010
38
40
42
44
46
48
50
52
54
56
58
3.5
4.0
4.5
5.0
VIN (V)
Figure 22. Line Regulation
5.035
5.030
VOUT (V)
5.025
5.020
5.015
5.010
0.0
0.5
1.0
1.5
2.0
2.5
3.0
IOUT (A)
Figure 23. Load Regulation VIN = 48 V
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Efficiency
90
85
Efficiency (%)
80
75
70
65
VIN = 38 V
60
VIN = 48 V
55
VIN = 58 A
50
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
IOUT (A)
Figure 24. Efficiency
Unit
Pind, winding
Pcore
Pstatic, IC
Phigh_gate
Plow_gate
Pdynam, IC
Phigh_switch, cond
Plow_switch, cond
Phigh_switch, sw
Plow_switch, sw
Plow_switch, body
Plow_dead_time
P_switch_capacit
Ppreregulator
Ploss, total
Pout
Pin
Effectivity
0.32
1.20
0.03
0.02
0.06
0.07
0.32
0.72
0.21
0.00
0.92
0.11
0.07
0.31
4.37
25.00
29.37
85
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
%
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
Inductor Winding Loss
Core Loss in Inductor. Available in Inductor Data Sheet
Static Power Loss of the IC
Power Loss of High Power Switch Gate Charge
Power Loss of Low Power Switch Gate Charge
Dynamic Power Loss of the IC
Conduction Loss of High Power Switcher
Conduction Loss of Low Power Switcher
Switching Loss of High Power Switcher
Switching Loss of Low Power Switcher
Body Diode Recovery Charge Loss
Body Diode Conduction Loss
Switchers Capacitance Loss
Power Loss of Linear Preregulator VIN → VCC
Total Loss
Output Power
Input Power = Output Power + Total Loss
Efficiency of Converter (Est: ±5%)
Figure 25. Power Loss Review from Spreadsheet
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Bode Plot
60
200
Phase
40
150
Gain
100
20
0
0
−50
−20
−100
−40
−150
−200
−60
0.01
0.1
1
10
f (MHz)
Figure 26. Bode Plot VIN = 48 V, IOUT = 5 A
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100
1000
Phase (5)
Gain (dB)
50
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Table 3. BILL OF MATERIALS FOR THE NCP1034 DEMOBOARD (Note 1)
Parts
Qty
Description
Value
Tolerance
Footprint
Manufacturer
Manufacturer
Part Number
Substitution
Allowed
R9
1
Resistor SMD
1.2 kW
1%
1206
Vishay
CRCW12061K20FKEA
Yes
R5
1
Resistor SMD
3.9 kW
1%
1206
Vishay
CRCW12063K90FKEA
Yes
R3
1
Resistor SMD
4.7 kW
1%
1206
Vishay
CRCW12064K70FKEA
Yes
R2
1
Resistor SMD
5.6 kW
1%
1206
Vishay
CRCW12065K60FKEA
Yes
R1
1
Resistor SMD
16.9 kW
1%
1206
Vishay
CRCW120616K9FKEA
Yes
R6
1
Resistor SMD
20 kW
1%
1206
Vishay
CRCW120620K0FKEA
Yes
R11A, R11B,
R11C, R11D,
R11E
5
Resistor SMD
12 kW
1%
1206
Vishay
CRCW120612K0FKEA
Yes
R4
1
Resistor SMD
110 kW
1%
1206
Vishay
CRCW1206110KFKEA
Yes
R7, R8, R10
3
Resistor SMD
10 kW
1%
1206
Vishay
CRCW120610K0FKEA
Yes
R12A, R13,
R14B, R15
4
Resistor SMD
0W
1%
1206
Vishay
CRCW120600R0FKEA
Yes
R12B, R14A
2
Resistor SMD
NU
−
1206
−
−
−
C8
1
Ceramic Capacitor SMD
1.8 nF
10%
1206
Kemet
C1206C182K5RAC-TU
Yes
C6
1
Ceramic Capacitor SMD
12 nF
10%
1206
Kemet
C1206C123K5RACTU
Yes
C5
1
Ceramic Capacitor SMD
220 nF
10%
1206
Kemet
C1206C224K5RACTU
Yes
C7
1
Ceramic Capacitor SMD
330 pF
10%
1206
Yageo
CC1206KRX7R9BB331
Yes
C11, C12
2
Ceramic Capacitor SMD
NU
−
1206
−
−
Yes
C2, C3, C4,
C10
4
Ceramic Capacitor SMD
100 nF
10%
1206
Kemet
C1206F104K1RACTU
Yes
C9A, C9B,
C9C
3
Ceramic Capacitor SMD
47 mF/6.3 V
20%
1206
Kemet
C1210C476M9PAC7800
Yes
C1A, C1B
2
Ceramic Capacitor SMD
2.2 mF/100 V
10%
1206
Murata
GRM32ER72A225KA35L
Yes
C1C, C1D,
C1E, C1F
4
Ceramic Capacitor SMD
NU
−
1206
−
−
Yes
C9D, C9E
2
Electrolytic Capacitor
NU
−
8x15
−
−
Yes
L1
1
Inductor SMD
13 mH
20%
13.2x12.8
Wurth
7443551131
Yes
D1
1
Switching Diode
MMSD4148
−
SOD−123
ON Semiconductor
MMSD4148T1G
Yes
D2
1
Zener Diode 500 mW
12 V
MMSZ4699
−
SOD1−23
ON Semiconductor
MMSZ4699T1G
Yes
Q1
1
NPN Transistor
NU
−
DPAK
−
−
Yes
Q2
1
Power N-MOSFET
NTD3055
−
DPAK
ON Semiconductor
NTD3055-150G
Yes
Q3
1
Power N-MOSFET
NTD24N06
−
DPAK
ON Semiconductor
NTD24N06T4G
Yes
IO1
1
High Voltage
Synchronous PWM Buck
Controller
NCP1034
−
SOIC−16
ON Semiconductor
NCP1034DR2G
No
X1
1
Inlet Terminal Block
PCB 2 WAY
−
Pitch: 5 mm
Lumberg
KRM 02
Yes
X2
1
Outlet Terminal Block
PCB 2 WAY
−
Pitch: 5 mm
Lumberg
KRM 02
Yes
1. All parts are Pb-Free
ON Semiconductor and the
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC) or its subsidiaries in the United States and/or other countries.
SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed
at www.onsemi.com/site/pdf/Patent−Marking.pdf. SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation
or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets
and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each
customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended,
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