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參數(shù)資料
| 型號： | MC33998 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Switching Power Supply with Linear Regulators(帶線性穩(wěn)壓器的開關(guān)電源) |
| 中文描述： | 開關(guān)電源與線性穩(wěn)壓器（帶線性穩(wěn)壓器的開關(guān)電源） |
| 文件頁數(shù)： | 14/20頁 |
| 文件大小： | 437K |
| 代理商： | MC33998 |
33998
14
Go to: www.freescale.com
Power-On Reset Timer
This timer starts to time out at the end of the soft-start period
if the V
DDH
and V
DDL
outputs are in the valid regulation range.
If the timer “times out”, then the open-drain PWROK signal is
released, indicating that “power is ON”.
Supervisory Circuits PWROK and VKAMOK
The 33998 has two voltage monitoring open-drain outputs,
the PWROK and the VKAMOK pins. PWROK is "active high".
This output is pulled low when either of the regulator outputs
(V
DDH
or V
DDL
) are below their regulation windows. If both
regulator outputs are above their respective lower thresholds,
and the Power-On Reset Timer has expired, the output driver is
turned off and this pin is at high-impedance state (see
Figure 6
).
The VKAMOK signal indicates a severe fault condition on
the keep-alive regulator output V
KAM
. The V
KAM
output voltage
is compared to the internal bandgap reference voltage. When
the V
KAM
falls below the bandgap reference voltage level, the
VKAMOK signal is pulled low.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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