Download EVBUM2129 - NCV885300 Evaluation Board User`s Manual

NCV885300EVB
NCV885300 Evaluation
Board User's Manual
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EVAL BOARD USER’S MANUAL
Description
Key Features
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The NCV885300 evaluation board provides a convenient
way to evaluate and integrate a complete high-efficiency
non-synchronous buck converter design. No additional
components are required, other than dc supplies for the input
voltage and enable pin. The board can also be connected to
an external clock source to synchronize the switching
frequency. The power good signal can be pulled up
externally with the PG+ pin. The board is configured for a
5.0 V output with a 340 kHz switching frequency and a 3 A
current limit, intended for applications requiring 2 A of
current.
Modifying the NCV885300 evaluation board for different
output voltage, switching frequency, or current limit is
straightforward, requiring minimal component changes.
5.0 V Output Voltage
340 kHz Switching Frequency
2.0 A Current Limit
Power Good Signal
Wide Input Voltage of 6.0 V to 36 V
Regulated through Load Dump Conditions
External Clock Synchronization up to 500 kHz
Automotive Grade
Figure 1. NCV885300EVB Board Picture
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© Semiconductor Components Industries, LLC, 2012
July, 2012 − Rev. 0
1
Publication Order Number
EVBUM2129/D
NCV885300EVB
Table 1. EVALUATION BOARD TERMINALS
Pin Name
VIN
Function
Positive dc input voltage
VOUT
Regulated dc output voltage
GND
Common dc return
EN/SYNC
Enable input and external clock synchronization input
PG
Digital power good output
PG+
Power good pull-up. Use this pin only when pulling-up PG to an external voltage
source.
Table 2. ABSOLUTE MAXIMUM RATINGS
(Voltages are with respect to GND)
Value
Units
Dc supply voltage (VIN)
-0.3 to 36
V
Dc supply voltage (EN/SYNC, PG, PG+)
-0.3 to 6.0
V
Rating
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 3. ELECTRICAL CHARACTERISTICS
(TA = 25°C, 6.0 V ≤ VIN ≤ 36 V, VEN/SYNC = 5.0 V, 0 ≤ IOUT ≤ 2.0 A, unless otherwise specified)
Characteristics
Conditions
Typical Value
Units
5.0
V
2
%
Regulation
Output Voltage
Voltage Accuracy
Line Regulation
IOUT = 1.0 A
0.04
%
Load Regulation
VIN = 13.2 V
0.12
%
Switching Frequency
340
kHz
Soft-start Time
2.0
ms
270 to 500
kHz
Cycle-by-Cycle Current Limit
3.33
A
Over Current Protection Threshold
5.0
A
VIN decreasing
3.1
V
TJ rising
170
°C
Switching
SYNC Frequency Range
Current Limit
Protections
Input Undervoltage Lockout (UVLO)
Thermal Shutdown
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NCV885300EVB
PG
PG_POS
R6
VOUT
R1
GND
EN/SYNC
C5
6800p
EN/SYNC
VIN
OPEN
U1
1
PG
10k
2
COMP
C6
470p
R3
3
4
FB
PG
EN/SYNC ISNS
COMP
R5
8.06k
GDRV
GND
FB
885300
8.06k
VIN
C3225X7S1H106K
C3
C2
10uF
10uF
C4
10uF
VIN
ISNS
7
6
5
C1
0.1uF
R2
30m
8
GND
NTTFS5116PL
Q1
L1
GDRV
VSW
VOUT
15 uH
XAL5050-153MEB
GND
C8 VOUT
C7
100 uF 0.1uF
B45197A2107K409
D1
MBRA340T3
R4
GND
42.2k
Figure 2. NCV885300EVB Board Schematic
Operational Guidelines
4. Optionally, for external clock synchronization,
connect a pulse source between EN/SYNC and
GND. The high state level should be within the
2.0 V to 5.5 V range, and the low state level within
the 0.0 V to 0.8 V range, with a frequency within
the 270 kHz to 500 kHz range.
1. Connect a dc input voltage, within the 6.0 V to
36 V range, between VIN and GND
2. Connect a load between VOUT and GND
3. Connect a dc enable voltage, within the 2.0 V to
5.5 V range, between EN/SYNC and GND
VIN
IOUT
ZOUT
VEN
VSYNC
Figure 3. NCV885300EVB Board Connections
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NCV885300EVB
Power Good Operation
• The Power Good pin (PG) allows you to digitally
•
1. Remove R1 from the board.
2. Populate R6 with a 10 kW resistor.
3. Connect the a voltage source between PG+ and
GND (please see the Absolute Maximum Ratings
table for more information).
4. PG is now ready to digitally monitor VOUT using
an external pull-up.
monitor the output voltage. When VOUT is above 90%
of the expected value, the PG signal is in a high state.
By default, PG is pulled high to VOUT through a
10 kW resistor.
Optional: To pull the PG pin high using a signal other
than VOUT, please make the following board
modifications:
TYPICAL PERFORMANCE
Regulation
0.2000%
0.1500%
Line Regulation (%)
0.1000%
0.0500%
Iout = 100 mA
Iout = 500 mA
0.0000%
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
-0.0500%
Iout = 1.0 A
Iout = 2.0 A
-0.1000%
-0.1500%
-0.2000%
Input Voltage (V)
Figure 4. Line Regulation for 340 kHz and a 5.0 V Output
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NCV885300EVB
0.2000%
0.1500%
Load Regulation (%)
0.1000%
0.0500%
0.0000%
0.001
VIN = 6.0 V
0.01
0.1
1
10
-0.0500%
-0.1000%
-0.1500%
-0.2000%
Output Current (A)
Figure 5. Load Regulation for 340 kHz and a 5.0 V Output
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5
VIN = 13.2 V
VIN = 36.0 V
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VIN
GND
10uF
C4
10uF
C3
VOUT
B45197A2107K409
0.1uF 100 uF
C7
C8
VOU
T
GND
10uF
C2
VIN
30m
R2
ISNS
Q1
NTTFS5116PL
0.1uF
C1
C3225X7S1H106K
L1
VSW
MBRA340T3
D1
XAL5050-153MEB
15 uH
8
7
GDRV 6
GND 5
R4
VIN
ISNS
GDRV
GND
42.2k
U1
PG
1
EN/SYNC
2
COMP
3
4
885300
FB
PG
FB
8.06k
R5
PG
R6
OPEN
R1
10k
COMP
470p
C6
VOUT
6800p
C5
EN/S
PG_P
EN/SYNC
GND
R3
8.06k
NCV885300EVB
SCHEMATIC
Figure 6. Evaluation Board Schematic
NCV885300EVB
PCB LAYOUT
Figure 7. Top View
Figure 8. Bottom View
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NCV885300EVB
Table 4. BILL OF MATERIALS
Reference
Part #
Manufacturer
Description
Package
U1
Value
NCV885300
ON Semiconductor
Integrated circuit
SOIC-8
Q1
NTTFS5116PL
ON Semiconductor
Power MOSFET,
P-Channel
WDFN8
D1
MBRA340T3G
ON Semiconductor
Diode, Schottky, 40 V,
3A
SMA
L1
15 mH
XAL5050-153MEB
Coilcraft
Shielded Power
Inductor
5 mm x 5 mm
R1
10.0 kW
CRCW060310K0FKEA
Vishay/Dale
Resistor, 1%
0603
R2
0.03 W
WSL0805R0300FEA18
Vishay/Dale
Resistor, 1%
0805
R3, R5
8.06 kW
CRCW06038K06FKEA
Vishay/Dale
Resistor, 1%
0603
R4
42.2 kW
CRCW060342K2FKEA
Vishay/Dale
Resistor, 1%
0603
C1
0.1 mF
GCM188R71H104KA57D
Murata
Capacitor, 50 V, X7R
0603
C2, C3, C4
10 mF
GRM32DF51H106ZA01L
Murata
Capacitor, 50 V, Y5V
1210
C5
6800 pF
EMK107SD682JA-T
Taiyo Yuden
Capacitor, 16 V
0603
C6
470 pF
06033A471JAT2A
AVX
Capacitor, 25 V, NP0
0603
C7
100 mF
B45197A2107K409
Kemet
Capacitor, 10 V
2917
C8
0.1
C0603C104K8RACTU
Kemet
Capacitor, 10 V, X7R
0603
ON Semiconductor and
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EVBUM2129/D