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| 型号： | STK730C |
| 厂商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | 5 V Single Output MOS Chopper Regulator |
| 中文描述： | 5 V单输出MOS斩波调压 |
| 文件页数： | 6/6页 |
| 文件大小： | 118K |
| 代理商： | STK730C |
STK730C
Overvoltage Protection Circuit Recommendations
When constant voltage power supply circuits fail, or a problem such as poor soldering on the PC board appears, the
failure mode can involve an overvoltage state in which the output voltage becomes higher than the specified voltage.
When an overvoltage failure occurs, the load driven by the power supply is often damaged, and severe damage can
occur. Also, if the overvoltage exceeds the output capacitor’s voltage limitation, the capacitor’s internal electrolytic fluid
can be vaporized and released by the operation of the capacitor’s explosion prevention valve. This gas can appear to be
white smoke.
When designing a power supply circuit, the need for an overvoltage protection circuit is the same regardless of whether
discreet components or integrated circuits are used. We strongly recommend the use of an overvoltage protection circuit
to hold to a minimum any damage that may result from an overvoltage state.
Overvoltage Protection Circuit Example
The crowbar circuit is a well known overvoltage protection circuit.
A Zener diode with a voltage 1 V to 2 V higher than the output voltage of the power supply is used as the diode ZD.
When the output voltage exceeds this value due to a malfunction or other cause, the Zener diode operates and the SCR
goes to the turn on short state since the SCR gate potential is pulled up. At this point the fuse at the input to the constant
voltage blows, completing the operation of the overvoltage protection circuit.
If the ambient temperature varies widely the crowbar circuit operating point can change due to the temperature
characteristics of both the Zener diode and the SCR’s cathode/gate voltage. As a result, the protection function may
operate even when the output voltage is normal. This circuit may also operate due to external noise.
Since, in general, the output voltage will be highest for the largest input and the smallest load, the operation and
effectiveness of the protection circuit must be confirmed in the actual mounted configuration of the end product.
Note: Step down chopper power supplies can generate an overvoltage on the output side equivalent to the input voltage
if there is an assembly error on the PC board or if the IC fails. Therefore we strongly recommend the use of a
crowbar or other overvoltage protection circuit in power supply designs.
No. 4472-6/6
This catalog provides information as of July, 1996. Specifications and information herein are subject to change
without notice.
s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace
equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of
which may directly or indirectly cause injury, death or property loss.
s Anyone purchasing any products described or contained herein for an above-mentioned use shall:
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and
distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all
damages, cost and expenses associated with such use:
Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on
SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.
s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for
volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied
regarding its use or any infringements of intellectual property rights or other rights of third parties.
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相关代理商/技术参数 |
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| STK730F | 制造商:AUK 制造商全称:AUK corp 功能描述:Advanced Power MOSFET |
| STK730FC | 制造商:AUK 制造商全称:AUK corp 功能描述:Advanced Power MOSFET |
| STK730P | 制造商:AUK 制造商全称:AUK corp 功能描述:Power MOSFET |
| STK731 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:12V Single Output MOS Chopper Regulator |
| STK7310 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:OFFLINE SWITCHING REGULATOR FOR COLOR TV USE |
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