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And8350.rev0
Prepared by: Alan Ball ON Semiconductor http://onsemi.com APPLICATION NOTE Introduction
the high side or an n-channel FET can be added in the low
Semiconductor’s eFuses offer low cost, low
impedance solutions for bus protection and offer much
N-channel FETs are more cost effective and are normally
faster protection than many fuse solutions. They are an
preferred if it is acceptable to break the ground line. If the
effective replacement for a polyfuse and TVS clamping
load has other connections to circuits that may be energized
under a reverse polarity input condition, the ground should
One area in which they differ in performance is reverse
polarity protection. While a TVS device and polyfuse will
If it is required to break the high side, a p-channel FET
protect against reverse voltages, the nature of an integrated
should be used. The two circuit configurations are shown in
semiconductor device does not inherently allow for this type
The reverse protection circuit includes a zener protection
This simple circuit allows the device to protect against
diode to protect against excessive gate to source voltage that
reverse voltage situations by simply blocking the reverse
could damage the FET. For FETs with 12 V or lower gates,
voltage. This is equivalent of the action of a poly fuse only
this is recommended. For FETs with 20 V gates, the zener
with less leakage. In comparison to a mechanical fuse, this
and resistor can be eliminated and the gate tied directly to the
is a far superior solution since the mechanical fuse will not
other rail as long as the maximum system transient spec is
reset and this circuit will automatically reset when the
A table of suggested FETs is included. The voltage and
Circuit Description
DS(on) are only suggestions. The system voltage
specifications should be taken into account to determine the
In order to protect against reverse voltages an external
maximum FET voltage and the losses due to the R
switch is required. There are two basic topologies that can
the FET. Please see the ON Semiconductor website
accomplish this function. A p-channel FET can be added in
(www.onsemi.com) for more options for FET choices. Figure 1. High-side Protection Circuit.
Semiconductor Components Industries, LLC, 2008
November, 2008 − Rev. 0 AND8350/D Figure 2. Low-side Protection Circuit. Table 1. SUGGESTED FETS FOR REVERSE PROTECTION CIRCUITS Recommended N-Channel FETs Recommended P-Channel FETs 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
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: N. American Technical Support: 800−282−9855 Toll Free ON Semiconductor Website: www.onsemi.com
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Email: [email protected] http://onsemi.com AND8350/D
TABELA DE PREÇOS DO CADASTRO DE PRODUTOS _____________________________________________________________________________________________Referencia DESCRICAO DO PRODUTO UNI MARCA GRUPO _____________________________________________________________________________________________S190 _____________________________________________________________________________________________ TABELA DE PREÇOS
PROCESSO SELETIVO SIMPLIFICADO PARA CONTRATAÇÃO DE PESSOAL PARA Observação: A bibliografia sugerida tem apenas o propósito de orientar o estudo dos candidatos, não excluindo, em hipótese alguma, outros livros que abranjam a matéria indicada para cada cargo. Motorista – Condutor de Veículos Leves PROVAS: Língua Portuguesa e Matemática LÍNGUA PORTUGUESA Habilidades exigidas: Com