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參數(shù)資料
| 型號： | NCP1521BMUTBG |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 MHz, 600 mA Step−Down DC−DC Converter |
| 中文描述： | 1.2 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 2 X 2 MM, 0.65 MM PITCH, LEAD FREE, UDFN-6 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大?。?/td> | 226K |
| 代理商： | NCP1521BMUTBG |
NCP1521B
http://onsemi.com
10
Cycle
by
Cycle Current Limitation
From the block diagram (Figure 4), an I
LIM
comparator
is used to realize cycle
by
cycle current limit protection.
The comparator compares the LX pin voltage with the
reference voltage, which is biased by a constant current. If
the inductor current reaches the limit, the I
LIM
comparator
detects the LX voltage falling below the reference voltage
and releases the signal to turn off the switch Q1. The
cycle
by
cycle current limit is set at 1200 mA (nom).
Short Circuit Protection
When the output is shorted to ground, the device limits
the inductor current. The duty
cycle is minimum and the
consumption on the input line is 300 mA (Typ). When the
short circuit condition is removed, the device returns to the
normal mode of operation.
Soft
Start
The NCP1521B uses soft
start (300 s Typ) to limit the
inrush current when the device is initially enabled.
Soft
start is implemented by gradually increasing the
reference voltage until it reaches the full reference voltage.
During startup, a pulsed current source charges the internal
soft
start capacitor to provide gradually increasing
reference voltage. When the voltage across the capacitor
ramps up to the nominal reference voltage, the pulsed
current source will be switched off and the reference
voltage will switch to the regular reference voltage.
Shutdown Mode
Forcing this pin to a voltage below 0.4 V will shut down
the IC. In shutdown mode, the internal reference, oscillator
and most of the control circuitries are turned off. Therefore,
the typical current consumption will be 0.3 A (typical
value). Applying a voltage above 1.2 V to EN pin will
enable the device for normal operation. The typical
threshold is around 0.7 V. The device will go through
soft
start to normal operation.
Thermal Shutdown
Internal Thermal Shutdown circuitry is provided to
protect the integrated circuit in the event that the maximum
junction temperature is exceeded. If the junction
temperature exceeds 160
°
C, the device shuts down. In this
mode switch Q1 and Q2 and the control circuits are all
turned off. The device restarts in soft
start after the
temperature drops below 135
°
C. This feature is provided
to prevent catastrophic failures from accidental device
overheating, and it is not intended as a substitute for proper
heatsinking.
Low Dropout Operation
The NCP1521B offers a low input to output voltage
difference. The NCP1521B can operate at 100% duty
cycle. In this mode the PMOS (Q1) remains completely on.
The minimum input voltage to maintain regulation can
be calculated as:
VIN(min)
VOUT(max)
(IOUT
(RDS(on)
(eq. 1)
RINDUCTOR))
V
OUT
: Output Voltage (Volts)
I
OUT
: Max Output Current
R
DS(on)
: P
Channel Switch R
DS(on)
R
INDUCTOR
: Inductor Resistance (DCR)
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| NCP1521BSNT1G | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 STEP DWN DCDC CNVRTR 1.5MHz 600mA RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| NCP1521UEVB | 功能描述:電源管理IC開發(fā)工具 ANA EVAL BRD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| NCP1522AEVB | 功能描述:電源管理IC開發(fā)工具 ANA EVAL BRD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| NCP1522ASNT1G | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 ANA LED DRIVER RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| NCP1522BMUTBG | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 STEP DWN DCDC CNVRTR 3.0MHz 600mA RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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