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參數資料
| 型號： | SP6128AHY |
| 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： | 6/10頁 |
| 文件大小： | 135K |
| 代理商： | SP6128AHY |
6
Rev. 08/19/05
SP6128A Low Voltage, Synchronous Step Down PWM Controller Copyright 2005 Sipex Corporation
As the figure shows, the SS voltage controls a
variety of signals. First, provided all the exter-
nal fault conditions are removed, an internal
5
μ
A pull-up at the COMP pin brings the
SP6128A out of shutdown mode. The internal
timing circuit is then activated and controls the
ramp-up of the error amp reference voltage. The
COMP pin is pulled to 0.7V by the internal
clamp and then gradually charges preventing
the error amplifier from forcing the loop to
maximum duty cycle. As the COMP voltage
crosses about 1V (valley voltage of the PWM
ramp), the driver begins to switch the high side
MOSFET with narrow pulses in an effort to
keep the converter output regulated . The
SP6128A operates at low duty cycle as the
COMP voltage increases above 1V. As the error
amp reference ramps upward, the driver pulses
widen until a steady state value is reached and
the output voltage is regulated to the final value
ending the soft start charge cycle.
Hiccup Mode
When the converter enters a fault mode, the
SP6128A holds the high side and low side
MOSFETs off for a finite period of time. Provided
that the SP6128A is enabled, this time is set by the
internal charge of the soft-start capacitor. In the
event of an overcurrent condition, the current
sense comparator sets the fault latch, which in turn
discharge the internal SS capacitor, the COMP pin
and holds the output drivers off. During this con-
dition, the SP6128A stays off for the time it takes
to discharge the COMP pin down to the 0.29V
shutdown threshold. At this point, the fault latch
is reset, but before the SP6128A is allowed to
attempt restart, the COMP pin has to charge back
to 1V before any output switching can be initiated.
Then, the regulator attempts to restart normally by
delivering short gate pulses and if the overcurrent
condition is still present, the cycle will repeat itself.
However, if upon restart, the overcurrent condi-
tion is still present, the SP6128A will detect the
fault and remain in a fault state until the internal
soft start voltage reaches about V
CC
-1V thereby
increasing the MOSFET off-time. This protection
scheme minimizes thermal stress to the regulator
components as the overcurrent condition persists.
OPERATION: continued
0.8 V
I(L)
TIME
0.3 V
0 V
0.7 V
1 V
COMP
Internal SS
Voltage
0 V
SWN
Voltage
FAULT
Current
Inductor
0 A
Voltage
Reference
Error Amp
0 V
V(V
CC
)
0 V
V(V
CC
)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| SP6128AHY/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 |
| SP6128AHY-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 |
| SP6128AHY-L/TR | 功能描述:電壓模式 PWM 控制器 Low Voltage Synchronous Step Dwn RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| SP6128ASEY-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 |
| SP6128ASEY-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 |
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