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參數(shù)資料
| 型號(hào)： | SP6120 |
| 英文描述： | Fixed Frequency, Voltage Mode, Synchronous PWM Controller(固定頻率，電壓模式同步PWM（脈寬調(diào)制控制器）) |
| 中文描述： | 固定頻率，電壓模式，同步PWM控制器（固定頻率，電壓模式同步的PWM（脈寬調(diào)制控制器）） |
| 文件頁(yè)數(shù)： | 8/20頁(yè) |
| 文件大?。?/td> | 187K |
| 代理商： | SP6120 |
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8
Rev. 2/15/01
SP6120 Low Voltage, AnyFET
TM
, Synchronous, Buck Controller Copyright 2001 Sipex Corporation
P
Soft Start: (continued)
The presence of the output capacitor creates
extra current draw during startup. Simply stated,
dV
OUT
/dt requires an average sustained current
in the output capacitor and this current must be
considered while calculating peak inrush current
and over current thresholds. Since the SP6120
ramps up the error amp reference voltage, an
expression for the output capacitor current can
be written as:
As the figure shows, the SS voltage controls a
variety of signals. First, provided all the external
fault conditions are removed, the fault latch is
reset and the SS cap begins to charge. When the
SS voltage reaches around 0.3V, the error amp
reference begins to track the SS voltage while
maintaining the 0.3V differential. As the SS
voltage reaches 0.7V, the driver begins to switch
the high side and low side MOSFETs with nar-
row pulses in an effort to keep the converter
output regulated. As the error amp reference
ramps upward, the driver pulses widen until a
steady state value is reached. The “bump” in the
inductor current transfer curve is indicative of
excess charge current incurred due to the finite
propagation delay of the controller. When the
SS voltage reaches 2.0V, the secondary loop
including the 3% window comparator is en-
abled. Lastly, the SS voltage is clamped at 2.2V,
ending the soft start charge cycle.
Hiccup Mode
When the converter enters a fault mode, the
driver holds the high side and low side MOSFETs
off for a finite period of time. Provided the part
is enabled, this time is set by the discharge of the
SS capacitor. The discharge time is roughly 10
times the charge interval thereby giving the
power supply plenty of time to cool during an
over current fault. The driver off-time is pre-
dominantly determined by the discharge time.
Restart will occur just like a normal soft start
cycle.
TIME
3% Low
V(V
CC
)
0V
SWN
V(V
CC
)
0V
FAULT
V(V
CC
)
0V
Inductor Current
I
LOAD
0V
Error Amplifier
0V
1.25V
V
OUT
= V(Eamp REF)* (1+RF/RI)
SS Voltage
0V
0.25V
0.7V
2.0V
2.2V
dV
SS
/dt = 40
μ
A/C
SS
IC
OUT
= (C
OUT
/C
SS
) * (V
OUT
/1.25) * 40
μ
A
V(ISP) - V(ISN)
0V
250mV
V(V
CC
)
0V
0V
2.0V
SS Voltage
FAULT Voltage
2.2V
40mV
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP6122ACU-15 | Low Voltage, Micro 8, PFET, Buck Controller Ideal for 1A to 5A, Small Footprint, DC-DC Power Converters |
| SP6122CU | Evaluation Board Manual |
| SP6122EB | Evaluation Board Manual |
| SP6122UEB | Evaluation Board Manual |
| SP6122ACU-1.5 | Low Voltage, Micro 8, PFET, Buck Controller Ideal for 1A to 5A, Small Footprint, DC-DC Power Converters |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP6120_05 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage, AnyFETTM, Synchronous,Buck Controller Ideal for 2A to 10A, High Performance, DC-DC Power Converters |
| SP612-05 | 制造商:Delphi Corporation 功能描述:WIRE STOP |
| SP612-07 | 制造商:Delphi Corporation 功能描述:LOCATOR |
| SP612-08 | 制造商:Delphi Corporation 功能描述:PIVOT PIN |
| SP6120B | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage, AnyFETTM, Synchronous ,Buck Controller Ideal for 2A to 10A, High Performance, DC-DC Power Converters |
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