BUK208-50Y,127 [NXP]
IC 3.6 A BUF OR INV BASED PRPHL DRVR, PZFM5, PLASTIC, TO-220, SOT-263B-01, SEP-5, Peripheral Driver;
| 型号： | BUK208-50Y,127 |
| 厂家： | 
NXP |
| 描述： | IC 3.6 A BUF OR INV BASED PRPHL DRVR, PZFM5, PLASTIC, TO-220, SOT-263B-01, SEP-5, Peripheral Driver 局域网 驱动 接口集成电路 驱动器 |
| 文件： | 总2页 (文件大小：77K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Automotive Power
Short-circuit protection
TOPFET applications of high-side switches
Designed to meet the demands of the harsh automotive
environment, Philips’ TOPFETs integrate a wide array of
sophisticated control and protection measures into highly
robust devices.They offer a uniquely simple design-in process
for protected PowerMOS applications.
S e m i c o n d u c t o r s
Philips’ BUK2xx-50Y single-channel TOPFET family of 50V high-side switches
offers an extensive range of safety features including protection against short
circuits. Depending on the severity of the short circuit, the devices respond
in one of two ways: a very rapid latched short-circuit trip or a slower
thermal over-temperature protection.
Latched short-circuit protection
A latched short-circuit trip will occur when both the following conditions
are met:
1. The time elapsed since switch-on is greater than the parameter tdsc
Typically tdsc = 180 µs.
.
2. The battery-load voltage,VBL, is greater than the trip threshold voltage,
VBL(to), which is approximately two-thirds of the battery-ground voltage,
VBG. In this case, the device is actively limiting the load current to some
value IL(lim)
.
Under the above circumstances, the device latches OFF and stays latched
OFF until the input is toggled low and then high again, or the battery supply
is removed and replaced. As an example we use the following typical values:
VBG = 16V, VBL(to) = 10V and IL(lim) = 18 A.Then the maximum load
resistance that will trip the short-circuit detector is
Key features
• No external components required as protection is fully integrated
within the TOPFET
• Integrated RG for reverse battery and supply transients protection
• Very low power dissipation due to low on-state resistance
• Very low quiescent current
RL = (VBG –VBL(to)) / IL = (16 – 10) / 18 = 0.333 Ω
• Diagnostic status indicator
• Virtually undetectable charge pump noise
A load resistance lower than RL will be viewed as a short circuit and cause
the device to switch off. If this short circuit occurs at a time greater than
tdsc after switch-on (short circuit while already ON) the device will be
tripped within a few microseconds. However, if the short circuit is already
present at switch-on (turn-on into short circuit) the device will only trip
after a delay equal to tdsc.This delay ensures there is no unwanted tripping
during device turn on.
Key benefits
• Input and status circuits see past the internal RG and refer their levels
to true ground
• Low EMC emissions
Key applications
• 12 and 24V grounded loads
• High in-rush current loads
• Inductive loads
Thermal protection
In a ‘soft’ short circuit there is a gentler overload in which one of the
above conditions is not met and hence the latched short-circuit detector
• Replacements for relays and fuses
Automotive Power TOPFET applications
Short-circuit protection of high-side switches
w w w. s e m i c o n d u c t o r s . p h i l i p s . c o m
is not tripped. Instead the device uses thermal shutdown to protect itself.
For example, with the typical values quoted above and a load resistance
RLG = 0.5 Ω,
VBL =VBG – IL(lim) * RLG = 16 – 18 * 0.5 = 7V
Obviously, this is lower than the trip threshold of 10V and so the latched
short-circuit protection will not shut the device off. However, the power
being dissipated (P = IL(lim) * VBL = 126 W) will quickly cause the device to
overheat, triggering the over-temperature protection feature which turns
the device off.The exact time taken until the over-temperature protection
switches off the device depends strongly on the application environment
and ambient conditions.
Status
The status indicator is an open drain with active pull down. It indicates active
bra012
LOW when any of the following conditions are met.
Product listing
Low load current during ON state
Max. RDS(on)
Package
This can only be indicated once the device has had time to properly turn
on, as it requires the detection of a very small voltage drop across the
power device. Once the device is fully turned-on, status can indicate LOW
within a few microseconds of this condition occurring. It will stop indicating
LOW within a few microseconds of the load current returning to normal.
(mΩ)
14
SOT236B
BUK212-50Y
BUK211-50Y
BUK223-50Y
BUK210-50Y
SOT426
BUK217-50Y
BUK216-50Y
BUK224-50Y
BUK215-50Y
20
30
38
Device latched off due to short circuit detection
BUK2138-50SYAA
BUK214-50Y
This can only occur once the time elapsed since switch-on is greater than
tdsc. If a short circuit occurs after this time, the device will latch off and
status will indicate LOW. Status will continue to indicate low until the input
is low or the battery-ground supply voltage is removed.
60
BUK209-50Y
BUK208-50Y
BUK219-50Y
100
180
BUK213-50Y
BUK220-50Y
Device shut down due to over-temperature
Philips Semiconductors
Behaviour depends on the nature of the over-temperature protection for
that product. For devices with latched over-temperature protection, status
will indicate LOW until the fault latch is cleared by taking the input low.
If the product auto-resets, status will indicate LOW until the device cools
to below the reset temperature. It will continue to remain LOW as long as
the device is above the reset temperature, even if the input becomes low.
Philips Semiconductors is a worldwide company with over 100 sales offices in more
than 50 countries. For a complete up-to-date list of our sales offices please e-mail
sales.addresses@www.semiconductors.philips.com. A complete list will be sent to you
automatically.You can also visit our website http://www.semiconductors.philips.com/sales.
© Koninklijke Philips Electronics N.V. 2004
All rights reserved. Reproduction in whole or in part is prohibited without the prior
written consent of the copyright owner.The information presented in this document
does not form part of any quotation or contract, is believed to be accurate and reliable
and may be changed without notice. No liability will be accepted by the publisher for
any consequence of its use. Publication thereof does not convey nor imply any license
under patent- or other industrial or intellectual property rights.
Date of release: February 2004
Document order number: 9397 750 11979
Published inThe Netherlands
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