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參數(shù)資料
| 型號： | 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）） |
| 文件頁數(shù)： | 9/20頁 |
| 文件大?。?/td> | 187K |
| 代理商： | SP6120 |
9
P
Rev. 2/15/01
SP6120 Low Voltage, AnyFET
TM
, Synchronous, Buck Controller Copyright 2001 Sipex Corporation
Hiccup Mode (continued)
However, if a fault occurs during the soft start
charge cycle, the FAULT latch is immediately
set, turning off the high side and low side
MOSFETs. The MOSFETs remain off during
the remainder of the charge cycle and subse-
quent discharge cycle of the SS capacitor. Again,
provided there are no external fault conditions,
the FAULT latch will be reset when the SS
voltage reaches 250 mV.
Over Current Protection
The SP6120 over current protection scheme is
designed to take advantage of three popular
detection schemes: Sense Resistor, Trace Resis-
tor or Inductor Sense. Because the detection
threshold is only 40mV, both trace resistor and
inductor sense become attractive protection
schemes. The inductor sense scheme adds no
additional dc loss to the converter and is an
excellent alternative to Rdson based schemes;
providing continuous current sensing and flex-
ible MOSFET selection. An internal, 10
μ
s filter
conditions the over current signal from tran-
sients generated during load steps. In addition,
because the over current inputs, ISP and ISN, are
capable of rail to rail operation, the SP6120
provides excellent over current protection dur-
ing conditions where V
IN
approaches V
OUT
.
Zero Crossing Detection
In some applications, it may be undesirable to
have negative conduction current in the induc-
tor. This situation happens when the ripple cur-
rent in the inductor is higher than the load cur-
rent. Therefore, the SP6120 provides an option
for “discontinuous” operation. If the Program
Logic (see next section) is set for discontinuous
mode, then the Driver Logic looks at the Zero
Crossing Comparator and the state of the lower
gate driver. If the low side MOSFET was “on”
and V(ISP)-V(ISN) < 0 then the low side
MOSFET is immediately turned off and held off
until the high side MOSFET is turned “on”.
When the high side MOSFET turns “on” , the
Driver Logic is reset. The following figures
show continuous and discontinuous operation
for a converter with an NFET high
side MOSFET.
Program Logic
The Program pin (PROG) of the SP6120 adds a
new level of flexibility to the design of DC/DC
converters. A 10
μ
A current flows either into or
out of the Program pin depending on the initial
potential presented to the pin. If no resistor is
present, the Program Logic simply looks at the
potential on the pin, sets the mode to “continu-
ous” and programs NFET or PFET high side
drive accordingly. If the 68 k
resistor is present,
the voltage drop across the resistor signals the
SP6120 to put the Driver Logic in “discontinu-
ous” mode. With one pin and a 68k
resistor, the
SP6120 can be configured for a variety of oper-
ating modes:
0V
0V
0A
0V
0V
0A
Continuous
GH, GL
Discontinuous
GH, GL
TIME
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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