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參數(shù)資料
| 型號： | SP6120HVEY |
| 英文描述： | High Voltage, Synchronous ,Buck Controller Ideal for 2A to 20A, High Performance, DC-DC Power Converters |
| 中文描述： | 高電壓，同步，降壓控制器適合2A至20A條，高性能，DC - DC電源轉(zhuǎn)換器 |
| 文件頁數(shù)： | 19/22頁 |
| 文件大小： | 308K |
| 代理商： | SP6120HVEY |
19
Date: 5/25/04
SP6120 Low Voltage, AnyFET
TM
, Synchronous, Buck Controller Copyright 2004 Sipex Corporation
In some applications, it may be desirable to
extend the current sense capability of a given
R
SEN
element (usually the inductor ESR) be-
yond the limit set by the 43mV threshold.
A straight forward way to do this would be to
add a resistor R
S2
in parallel with C
S
, creating a
voltage divider with R
S
. This changes the rela-
tionship with R
S
and C
S
to be
L
ESR R
S
//R
S2
C
S
= 2
1
Using a voltage divider across the inductor, the
new relationship becomes:
I
LIM
=43mV R
S
+ R
S2
ESR
R
S2
To calculate R
S2
, the formula becomes
R
S2
= R
I
ESR – 1
)
43mV
R
S
C
S
L
V
OUT
SWN
R
S2
ESR
ISP
ISN
Figure 20: Current Sensing
Figures 21(A), a voltage divider connected to the V
pin programs the output voltageand 21(B), a simple circuit using
one external voltage reference programs the output voltages to less than 1.25V.
R1
R2
R2
R1
R3
A
B
V
REF
V
FB
V
FB
V
OUT
< 1.25V
V
OUT
> 1.25V
SP6120
SP6120
Output Voltage Programming
As shown in Figure 21(A), the voltage divider
connecting to the V
FB
pin programs the output
voltage according to
V
OUT
= 1.25( 1 + R
1
)
R
2
where 1.25V is the internal reference voltage.
Select R2 in the range of 10k to 100k, and R1 can
be calculated using
R
1
= R
2
(V
OUT
– 1.25)
1.25
For output voltage less than 1.25V, a simple
circuit shown in Figure 21(B) can be used in
which V
REF
is an external voltage reference
greater than 1.25V. For simplicity, use the same
resistor value for R1 and R2, then R3 is deter-
mined as follows,
R
3
= (V
REF
– 1.25)R
1
2.5 – V
OUT
APPLICATIONS INFORMATION: Continued
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP6120HVCY | CAPACITOR, F/TERM 6800PF 50V X8R 0805CAPACITOR, F/TERM 6800PF 50V X8R 0805; CAPACITANCE:6.8NF; VOLTAGE RATING, DC:50V; CAPACITOR DIELECTRIC TYPE:CERAMIC MULTI-LAYER; SERIES:08055F; TOLERANCE, :10%; TOLERANCE, -:10%; TEMP, OP. RoHS Compliant: Yes |
| SP6120EY | Low Voltage, AnyFETTM, Synchronous,Buck Controller Ideal for 2A to 10A, High Performance, DC-DC Power Converters |
| SP6120HV | High Voltage, Synchronous ,Buck Controller Ideal for 2A to 20A, High Performance, DC-DC Power Converters |
| SP6121 | Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| SP6121CN | Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP6120HVEY/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Voltage, Synchronous ,Buck Controller Ideal for 2A to 20A, High Performance, DC-DC Power Converters |
| SP6121 | 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 |
| SP612-10 | 制造商:Delphi Corporation 功能描述:TORSION SPRING |
| SP6121CN | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Low Voltage, 8 Pin Synchronous, Cntrllr 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(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SP6121CN/TR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Low Voltage, 8 Pin Synchronous, Cntrllr 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(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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