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參數(shù)資料
| 型號： | APE8901GN2 |
| 廠商： | ADVANCED POWER ELECTRONICS CORP |
| 元件分類： | 可調(diào)正電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | ADJUSTABLE POSITIVE LDO REGULATOR, PDSO8 |
| 封裝： | 2 X 2 MM, LEAD FREE, DFN-8 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 551K |
| 代理商： | APE8901GN2 |
Advanced Power
Electronics Corp.
APE8901
PIN DESCRIPTION
VOUT
FUNCTION DESCRIPTION
Power-On-Reset
Internal Soft-Start
Output Voltage Regulation
Current-Limit
Under-Voltage Protection (UVP)
Thermal Shutdown
5
Output of the regulator. Please connect Pin 6 using wide tracks. It is necessary to connect
an output capacitor with this pin for closed-loop compensation and improving transient responses.
A Power-On-Reset (POR) circuit monitors both input voltages at VCNTL and VIN pins to
prevent wrong logic controls. The POR function initiates a soft-start process after the two supply
voltages exceed their rising POR threshold voltages during powering on. The POR function also
pulls low the POK pin regardless the output voltage when the VCNTL voltage falls below its falling
POR threshold.
An internal soft-start function controls rise rate of the output voltage to limit the current
surge at start-up. The typical soft-start interval is about 2mS.
An error amplifier working with a temperature compensated 0.8V reference and an output
NMOS regulates output to the preset voltage. The error amplifier designed with high bandwidth
and DC gain provides very fast transient response and less load regulation. It compares the
reference with the feedback voltage and amplifies the difference to drive the output NMOS which
provides load current from VIN to VOUT.
The APE8901 monitors the current via the output NMOS and limits the maximum current to
prevent load and APE8901 from damages during overload or short circuit conditions.
The APE8901 monitors the voltage on FB pin after soft-start process is finished. Therefore
the UVP is disabling during soft-start. When the voltage on FB pin falls below the under-voltage
threshold, the UVP circuit shuts off the output immediately. After a while, the APE8901 starts a
new soft-start to regulate output.
A thermal shutdown circuit limits the junction temperature of APE8901. When the junction
temperature exceeds +150°C, a thermal sensor turns off the output NMOS, allowing the device to
cool down. The regulator regulates the output again through initiation of a new soft-start cycle after
the junction temperature cools by 40°C, resulting in a pulsed output during continuous thermal
overload conditions. The thermal shutdown designed
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