onsemi NCV887720 Automotive Grade High Frequency User Manual

onsemi NCV887720 Automotive Grade High Frequency

FAQ

• Q: What is the minimum input voltage required for the evaluation board to operate under full load?
  • A: The evaluation board can operate under full load with an input voltage as low as 3.75 V at the input terminal.
• Q: How should I set the DISB TTL control signal for the first-time power-up?
  • A: The initial DISB state should be set to logic ‘0’ when connecting the DISB TTL control signal for the first-time power-up.

Description

This NCV887720 evaluation board provides a convenient way to evaluate a high frequency boost controller designed to supply a minimum output voltage during Start-Stop vehicle battery voltage sags. The unit is in low Iq sleep-mode under normal battery operating condition and wakes-up when the monitored voltage drops below 10.65 V and begin regulating once 10.0 V is reached. Switching frequency is set to 440 kHz with a user selectable ROSC resistor. The evaluation board is rated 10.0 V / 2.5 A at a 3.75 V input voltage. Operation below 3.75 V is possible if output current is reduced.

NCV887720 Start−Stop Evaluation Board

Key Features

• Automatic Enable below 10.65 V
• Disable Override Function
• Boost Operation at 10.0 V
• 440 kHz Switching Frequency
• Input Undervoltage Lockout
• Wide Input Voltage of 3.75 V to 45 V
• Low Quiescent Current in Sleep Mode (< 12 A Typical)
• Cycle-by-Cycle Current Limit Protection
• Automotive Grade

Specifications

Table 1. EVALUATION BOARD TERMINALS

Table 2. ABSOLUTE MAXIMUM RATINGS (Voltages are with respect to GND)

Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected.

Table 3. ELECTRICAL CHARACTERISTICS

(TA = 25°C, 3.75 V ≤ VIN ≤ Vout_LED, VDISB = 5 V, unless otherwise specified)

Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be indicated by the Electrical Characteristics if operated under different conditions.

Operational Guidelines

The evaluation board is rated to operate under full load for input voltage as low as 3.75 V at the input terminal under full power (less if output current is reduced). Start-Stop applications use reverse battery protection diodes in front of the boost converter (Figure 2), so the input source can operate down to 3.75 V plus a diode drop (i.e ∼4.25 V).

Notes:

1. The IC UVLO (undervoltage lockout) is 4.25 V for VOUT rising, 3.8 V for VOUT falling (0.45 V hysteresis).
2. Limit time spent with the power supply operating at minimum input voltage (equivalent to VIN = 3.75 V) to avoid overheating the power semiconductors.

First Time Power-Up:

1. Connect a DC source voltage (15 A capable) set to a voltage of 13 − 14 V as shown in Figure 1.
2. Connect the DISB TTL control signal as shown in Figure 1. The initial DISB state should be set to logic −‘0’.
3. Connect a 2.5 A constant current load on the output.
4. Decrease the DC input voltage until the PCB VIN voltage is 5.5 V ±0.5 V.
5. Set the DISB control signal to a TTL high state (i.e. 5 V).
6. Verify that the unit is regulating at VOUT = 10.0 V.
7. Reduce the DC input voltage until the PCB VIN = 3.75 V. Verify that the unit is regulating at VOUT = 10.0 V.

Start-Stop Voltage Transient Test:

1. Connect both DC1 and DC2 input power supplies as illustrated in Figure 2. Adjust DC2 so that PCB VIN = 3.75 V for a 2.5 A load.
2. Connect a 2.5 A load on the output. If a load resistor is used, it is recommended to start from a DC1 input voltage of 13 − 14 V to avoid overstressing the PCB boost diode (D1, rated 4 A).
3. Monitor VOUT. Disconnect supply DC1. VOUT should have a response similar to that of Figure 3.

Typical Performance

DC1 is disabled, then re-enabled

• DC2 at VIN adjusted to 3.75 V (after reverse polarity protection diode)
• VOUT = 10.0 V, IOUT = 2.5 A

SCHEMATIC

BILL OF MATERIALS

Table 4. BILL OF MATERIALS*

Reference Designator(s )

| ****

QTY

| ****

Description

| ****

Value

| ****

Toler- ance

| ****

Manufacturer

| ****

Manufacturer’s Part Number

| Substi- tution Allowed
---|---|---|---|---|---|---|---
C1| 1| CAP CER 330PF 50V 5% NP0 0603| 330 pF| 5%| Murata Electronics North America| GCM1885C1H331JA16D| Yes
C2| 1| CAP CER 0.012UF 50V 10% X7R 0603| 0.012 µF| 10%| Murata Electronics North America| GRM188R71H123KA01D| Yes
C3| 1| CAP CER 1UF 16V 10% X7R 0603| 1 µF| 10%| Murata Electronics North America| GCM188R71C105KA64D| Yes
C4, CO1| 2| CAP CER 1UF 50V 10% X7R 0805| 1.0 µF| 10%| TDK Corporation| CGA4J3X7R1H105K125AB| Yes
C5| 1| CAP CER 150PF 50V 5% NP0 0603| 150 pF| 5%| Murata Electronics North America| GCM1885C1H151JA16D| Yes
CI1, CO6| 2| CAP CER 0.1UF 50V 10% X7R 0805| 100 nF| 10%| Murata Electronics North America| GCM21BR71H104KA37L| Yes
CI2| 1| CAP ALUM 220UF 50V 20% SMD| 220 µF| 20%| Chemi−Con| EMZA500ADA221MJA0G| Yes
CI3| 1| CAP ALUM 470UF 50V 20% RADIAL| 470 µF| 20%| Panasonic Electronic Components| EEU-FC1H471| Yes
CO2, CO4| 2| CAP ALUM 100UF 35V 20% SMD| 100 µF| 20%| Nichicon| RHS1V101MCN1GS| No
CO3| DNP| | | | | |
CO5| 1| CAP CER 4.7UF 50V 10% X7R 1210| 4.7 µF| 10%| Murata Electronics North America| GCM32ER71H475KA55L| Yes
CSNB| 1| CAP CER 3300PF 50V 5% NP0 0603| 3300 pF| 5%| TDK Corporation| CGA3E2C0G1H332J080AA| Yes
D1| 1| 40 V, 4.0 A Schottky Rectifier SO8-FL| 40 V /

4A

| N/A| ON Semiconductor| NRVB440MFST1G| No
L1| 1| INDUCTOR POWER 2.7UH 12.8A SMD| 2.7 µH| 20%| Coilcraft, Inc| XAL7030-272ME| No
Q1| 1| N-Channel Power MOSFET 60V 61A SO-8FL| 60 V /

61 A

| N/A| ON Semiconductor| NVMFS5844NL| No
R1| 1| RES 5.62K OHM 1/10W 1% 0603 SMD| 5.62 K| 1%| Vishay Dale| CRCW06035K62FKEA| Yes
R2| 1| RES 10.7K OHM 1/10W 1% 0603 SMD| 10.7 K| 1%| Vishay Dale| CRCW060310K7FKEA| Yes
R3| 1| RES 0.0 OHM 1/10W JUMP 0603 SMD| 0| Jumper| Vishay Dale| CRCW06030000Z0EA| Yes
R4| 1| RES 249 OHM 1/10W 1% 0603 SMD| 249 | 1%| Vishay Dale| CRCW0603249RFKEA| Yes
R6| DNP| | | | | |
R7, R8| 2| RES 0.036 OHM 1W 5%

1206 SMD

| 0.036| 5%| Panasonic Electronic Components| ERJ-8BWJR036V| No
RDAMP| 1| RES 0.68 OHM 1/10W 1% 0603 SMD| 0.68| 1%| Panasonic Electronic Components| ERJ-3RQFR68V| Yes
RSNB| 1| RES 6.80 OHM 1/10W 1% 0603 SMD| 6.8 | 1%| Vishay Dale| CRCW06036R80FKEA| Yes
U1| 1| Automotive Non-Sync Boost Controller| N/A| N/A| ON Semiconductor| NCV887720| No

*All Materials are RoHS Compliant

PCB LAYOUT

NCV887720BSTGEVB

onsemi, , and other names, marks, and brands are registered and/or common law trademarks of Semiconductor Components Industries, LLC dba “onsemi” or its affiliates and/or subsidiaries in the United States and/or other countries. onsemi owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of onsemi’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. onsemi is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.

The evaluation board/kit (research and development board/kit) (hereinafter the “board”) is not a finished product and is not available for sale to consumers. The board is only intended for research, development, demonstration and evaluation purposes and will only be used in laboratory/development areas by persons with engineering/technical training and familiar with the risks associated with handling electrical/mechanical components, systems and subsystems. This person assumes full responsibility/liability for proper and safe handling. Any other use, resale or redistribution for any other purpose is strictly prohibited.

THE BOARD IS PROVIDED BY ONSEMI TO YOU “AS IS” AND WITHOUT ANY REPRESENTATIONS OR WARRANTIES WHATSOEVER. WITHOUT LIMITING THE FOREGOING, ONSEMI (AND ITS LICENSORS/SUPPLIERS) HEREBY DISCLAIMS ANY AND ALL REPRESENTATIONS AND WARRANTIES IN RELATION TO THE BOARD, ANY MODIFICATIONS, OR THIS AGREEMENT, WHETHER EXPRESS, IMPLIED, STATUTORY OR OTHERWISE, INCLUDING WITHOUT LIMITATION ANY AND ALL REPRESENTATIONS AND WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, NON−INFRINGEMENT, AND THOSE ARISING FROM A COURSE OF DEALING, TRADE USAGE, TRADE CUSTOM OR TRADE PRACTICE. onsemi reserves the right to make changes without further notice to any board.

You are responsible for determining whether the board will be suitable for your intended use or application or will achieve your intended results. Prior to using or distributing any systems that have been evaluated, designed or tested using the board, you agree to test and validate your design to confirm the functionality for your application. Any technical, applications or design information or advice, quality characterization, reliability data or other services provided by onsemi shall not constitute any representation or warranty by onsemi, and no additional obligations or liabilities shall arise from onsemi having provided such information or services.

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This evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and may not meet the technical requirements of these or other related directives.

FCC WARNING

This evaluation board/kit is intended for use for engineering development, demonstration, or evaluation purposes only and is not considered by onsemi to be a finished end product fit for general consumer use. It may generate, use, or radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this equipment may cause interference with radio communications, in which case the user shall be responsible, at its expense, to take whatever measures may be required to correct this interference. onsemi does not convey any license under its patent rights nor the rights of others.

LIMITATIONS OF LIABILITY: onsemi shall not be liable for any special, consequential, incidental, indirect or punitive damages, including, but not limited to the costs of prequalification, delay, loss of profits or goodwill, arising out of or in connection with the board, even if onsemi is advised of the possibility of such damages. In no event shall onsemi’s aggregate liability from any obligation arising out of or in connection with the board, under any theory of liability, exceed the purchase price paid for the board, if any.

The board is provided to you subject to the license and other terms per onsemi’s standard terms and conditions of sale. For more information and documentation, please visit www.onsemi.com.

ADDITIONAL INFORMATION

TECHNICAL PUBLICATIONS:

• Technical Library: www.onsemi.com/design/resources/technical−documentation
• onsemi Website: www.onsemi.com
• ONLINE SUPPORT: www.onsemi.com/support
• For additional information, please contact your local Sales Representative at: www.onsemi.com/support/sales

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