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參數(shù)資料
| 型號： | SP6128ACY |
| 英文描述： | Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| 中文描述： | 低電壓，為第2A同步降壓PWM控制器的理想下至10A，占地面積小，DC - DC電源轉換器 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大小： | 135K |
| 代理商： | SP6128ACY |
7
Rev. 08/19/05
SP6128A Low Voltage, Synchronous Step Down PWM Controller Copyright 2005 Sipex Corporation
SP6128A OVER CURRENT (HICCUP MODE)
Test Conditions
V
FB
= 0.7V
V
CC
= PV
CC
= 5.0V
A more detailed description of the waveform is shown below.
Over Current Protection
Over current protection on the SP6128A is imple-
mented through detection of an excess voltage
condition across the high side NMOS switch
during conduction. This is typically referred to
as high side R
DS(ON)
detection and eliminates the
need of an external sense resistor. The over
current comparator charges an internal sam-
pling capacitor each time V
SWN
is lower than
(V
ISET
- 140mV) and the GH voltage is high. The
discharge/charge current ratio on the sampling
capacitor is about 2%. Therefore, provided that
the over current condition persists, the capacitor
voltage will be pumped up during each time GH
switches high. This voltage will trigger an over
current condition upon reaching a CMOS in-
verter threshold. There are many advantages to
this approach. First, the filtering action of the
gated scheme protects against false and undesir-
able triggering that could occur during a minor
transient overload condition or supply line noise.
Furthermore, the total amount of time to trigger
the fault depends on the on-time of the high side
NMOS switch. Fifteen, 1
μ
s pulses are equiva-
lent to thirty, 500ns pulses or one, 15
μ
s pulse,
however, depending on the period, each sce-
nario takes a different amount of total time to
trigger a fault. Therefore, the fault becomes an
indicator of average power in the high side
BST = 5.0V
SWN - tied to GND through 1k Resistor
COMP – released from GND
Internal SSTART
passes V(V
FB
), COMP
pops to ~ internal
SSTART voltage +0.7V
Internal SSTART rises until
~ V
CC
-1V, then gives command
to attempt RESTART
COMP Clamps
~ 3V
After pop, COMP
retains internal
SSTART slope
ENABLE
Part
Attempt
RESTART
5
μ
A PULLUP slope to 0.3V;
35
μ
A PULLUP to 0.7V
Overcurrent Detected
G
H
Turns Off
Fault Mode Enabled
G
H
COMP
OPERATION: continued
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SP6128ACY/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| SP6128ACY-L | 功能描述:開關變換器、穩(wěn)壓器與控制器 Low Voltage Synchronous Step Dwn RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SP6128ACY-L/TR | 功能描述:開關變換器、穩(wěn)壓器與控制器 Low Voltage Synchronous Step Dwn RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SP6128AEY | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| SP6128AEY/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
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