ON Semiconductor NCV8871BSTGEVB User manual

©Semiconductor Components Industries, LLC, 2012
February, 2012 −Rev. 0
1Publication Order Number:
EVBUM2066/D
NCV8871BSTGEVB
NCV8871 Automotive Grade
Boost Controller Audio
Amplifier Evaluation Board
User's Manual
Description
The NCV8871BST evaluation board provides an
opportunity to evaluate the NCV887100 in an audio
amplifier power supply type application. The board supplies
an 18 V output with 9 A of output current from as low as a
6 V input. The enable pin can also be used to synchronize the
supply to an external clock.
Key Features
•18 V Output Voltage
•9 A Output Current
•Fixed Frequency Operation at 170 kHz
•Regulates Fully Loaded From as Low as 6 V Input
•Survives 40 V Load Dump
•External Clock Synchronization up to 340 kHz
•Automotive Grade
Figure 1. NCV8871BSTGEVB Evaluation Board
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EVAL BOARD USER’S MANUAL
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Table 1. EVALUATION BOARD TERMINAL DESCRIPTIONS
Terminal Function
VIN Positive dc input voltage.
GND Common dc return.
VOUT Dc output voltage.
EN/SYNC Dc enable voltage and external clock synchronization. A dc logic low disables the device.
Table 2. ABSOLUTE MAXIMUM RATINGS (Voltages are with respect to GND)
Rating Value Unit
Dc Supply Voltage (VIN) -0.3 to 40 V
Dc Supply Voltage (EN/SYNC) -0.3 to 6 V
Ambient Temperature -40 to 85 °C
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, 4.5 ≤VIN ≤18 V, IOUT ≤2 A, unless otherwise specified)
Characteristic Conditions Typical Value Unit
OUTPUT VOLTAGE
Output Voltage 18.00 V
Voltage Accuracy −40 ≤TA ≤85 4 %
Soft-start Time 7.4 ms
SWITCHING REGULATOR
Switching Frequency 170 kHz
SYNC Frequency 170 to 340 kHz
Duty Cycle Range 2 to 88 %
Current Limit
Cycle-by-cycle current limit 50 A
General
Input Undervoltage Lockout (UVLO) VIN increasing 3.8 V
Efficiency VIN = 13.2 V, IOUT = 5 A 5 %
Thermal Shutdown 170 °C
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TYPICAL WAVEFORMS
Figure 2. Normal Operation Figure 3. Gate Drive Falling Edge
Figure 4. Gate Drive Rising Edge Figure 5. Synchronization
Figure 6. Soft Start with Load
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SCHEMATIC
Figure 7. NCV8871BSTGEVB Evaluation Board Schematic
R10 0
U1
8871
VDRV
5
VIN
6
VC
7
VFB
8EN/SYNC 1
ISNS 2
GND 3
GDRV 4
C1
1uF
+C2
680uF
VIN
L1 6.8uH
SER2915H-682KL
R1
8 mohm
R2
10K
C4
10000pF
VC
R11 0
R3
14K
R4
1K
VFB
ISNS
D2
MBR140SFT1G
D3
MBR140SFT1G
GDRV
Q2
NTD5802NGDRV
VIN_IC
Q1
NTD5802N
VOUT
VIN
VIN_IC
GND
C16
100nF
VIN VIN_IC
+C7
680uF
+C8
680uF
+C9
680uF
+C10
680uF
C12
1uF
VOUT
GND VOUT
C13
1uF
MNT2
CON1
1
C11 1uF
+C5
680uF
+C6
680uF
MNT3
CON1
1
C14
330pF
VDRV
MNT4
CON1
1
VIN
Place cap close
to VIN pin
EN/SYNC
EN/SYNC
VDRV
VC
VFB
GND
ISNS
GND GND
VSW
VOUT
GND
MNT1
CON1
1
C15
100nF
+C3
680uF
D1
MBRB2545CTT4G
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PCB Layout
Figure 8. Top Layout
Figure 9. Bottom Layout
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Table 4. BILL OF MATERIALS
QTY Description Value Toler-
ance
Footprint Manufacturer Manufacturer’s Part
Number
Substi-
tution
Allowed
RoHS
Com-
pliant
1CAP CER 1UF 16V
X7R 0603
1 uF 10% 603 Murata Electronics
North America
GRM188R71C105KA12D Yes Yes
2CAP ELECT 1000UF
50V FK SMD
1000
uF
20% FKV_CAP Panasonic  ECG EEEFK1H102AM No Yes
1CAP CER 33000PF
50V X7R 0603
33000
pF
10% 603 Murata Electronics
North America
GRM188R71H333KA61D No Yes
9CAP 180UF 50V
ELECT FM RADIAL
180 uF 20% CAP_8P0 Murata Electronics
North America
EEUFM1H181L No Yes
3CAP CER 1UF 50V
X7R 1206
1 uF 10% 1206 Murata Electronics
North America
GCM31MR71H105KA55L Yes Yes
1CAP CER 2700PF
100V 10% X7R 0603
2700
pF
10% 603 Murata Electronics
North America
GRM188R72A272KA01D No Yes
2CAP CER .1UF 50V
10% X7R 0805
100 nF 10% 805 Murata Electronics
North America
GRM21BR71H104KA01L Yes Yes
1Do Not Populate 603 Yes Yes
145V, 30A D2PAK
Schottky Rectifier
45 V /
30 A
N/A D2PAK_3 ON Semiconductor MBRB2545CTT4G No Yes
2DIODE SCHOTTKY
40V 1A SOD123FL
40 V /
1A
N/A SOD_123 ON Semiconductor MBR140SFT1G No Yes
1CONN HEADER
4POS R/A 1.5MM TIN
N/A N/A 4PINCONN Coilcraft Inc 2922064 No Yes
1High Temp SMT
Power Inductor 6.8uH
6.8 uH 30A SER2900 Coilcraft Inc SER2915H682KL No Yes
2MOSFET NCH 40V
101A DPAK
40 V /
101 A
N/A DPAK3_DMD ON Semiconductor NTD5802NT4G No Yes
1RES 0.008 OHM 3W
1% 3015 SMD
0.008 1% 3015 Susumu KRL7638CR008FT1 No Yes
1RES 6.34K OHM
1/10W 1% 0603 SMD
6.34 K 1% 603 Vishay/Dale CRCW06036K34FKEA Yes Yes
1RES 14.0K OHM
1/10W 1% 0603 SMD
14.0 K 1% 603 Vishay/Dale CRCW060314K0FKEA Yes Yes
1RES 1.00K OHM
1/10W 1% 0603 SMD
1.00 K 1% 603 Vishay/Dale CRCW06031K00FKEA Yes Yes
2RES 0.0 OHM 1/8W
0805 SMD
0 5% 805 Vishay/Dale CRCW08050000Z0EA Yes Yes
13 PIN INBOARD .042"
HOLE 1000/PKG
N/A N/A TP Vector Electronics K24C/M Yes Yes
4CONN JACK BANANA
UNINS PANEL MOU
N/A N/A BANANA Emerson Network
Power Conn Solu
tions
1080740001 No Yes
1Automotive NonSync
Boost Controller
N/A N/A SO
IC8_N_ADJ
ON Semiconductor NCV8871_00 No Yes
1Automotive NonSync
Boost Controller
N/A N/A 10PINDFNP5 ON Semiconductor NCV8872_00 No Yes
4Hex Spacer 440 1/2"
Zinc Plated Steel
N/A N/A MOUN
THOLE125
McMasterCarr 93620A432 Yes Yes
4Hex Nut 440 1/4" Zinc
Plated Steel
N/A N/A MOUN
THOLE125
McMasterCarr 90480A005 Yes Yes
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ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
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