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參數(shù)資料
| 型號： | sp6650 |
| 英文描述： | High Efficiency 600mA Synchronous Buck Regulator(高效率,600mA同步補(bǔ)償穩(wěn)壓器) |
| 中文描述： | 600mA的高效率同步降壓穩(wěn)壓器（高效率，600mA的同步補(bǔ)償穩(wěn)壓器） |
| 文件頁數(shù)： | 14/17頁 |
| 文件大?。?/td> | 170K |
| 代理商： | SP6650 |
14
Rev. 2/4/02
SP6650 High Efficiency 600mA Synchronous Buck Regulator
Copyright 2002 Sipex Corporation
Figure 19. Additional Application Circuit: V
IN
= 5.0V, V
OUT
= 12V, and Max I
LOAD
= 150mA.
1RB
SP6650
U1
10
9
8
7
6
1
2
3
4
5
L3
47
μ
H
C
OUT1
100
F/16V
R2
R3
PV
IN
V
IN
BLON
I
LIM
SHDN
LX
PGND
GND
V
OUT
FB
12V/150mA
V
IN
4.5-6.5 VDC
RV
IN
5.0
R2
4.02k
C
IN
47
μ
F
D1
MBR0530TI
Q1
FDS637AN
R1
11.3k
CV
IN
1.0
μ
F
Figure 20. Additional Application Circuit: V
IN
= 5.0V, V
OUT
= 5.0V, I
LOAD
= 250mA.
RB
100k
SP6650
U1
10
9
8
7
6
1
2
3
4
5
L1
47
μ
H
C
OUT1
47
R2
R3
PV
IN
V
IN
BLON
I
LIM
SHDN
LX
PGND
GND
V
OUT
FB
5V/250mA
V
IN
4.5-6.5 VDC
RV
IN
10.0
R2
4.02k
C
IN
47
μ
F
D1
MBR0530T1
Q1
FDS637AN
Cf2
R1
11.3k
CV
IN
4.7
μ
F
C
OUT2
47
SP6650 can also be configured with few external
components to achieve buck-boost voltage con-
version. Efficiency of 75% to 87% can often be
obtained depending on the load current and output
voltage. Figure 19 and Figure 20 demonstrate two
typical applications in which the USB input is
converted to a 12V and a well regulated 5V.
The operation of the circuit is as follows. When
the internal high side PMOS turns on, the LX pin
swings to the input voltage which turns on the
external NMOS Q1. A voltage equal to Vin is
then applied to the inductor to cause the inductor
current rise linearly. Since there’s no current
delivered to the output, the output capacitor is
discharged by the load current. Therefore, the
internal PMOS can be only turned off by the
over-current comparator since the loop com-
parator would never toggle during this state.
When the internal PMOS is open, the internal
low side NMOS is turned on. This pulls the LX
pin to the ground and turns off the Q1. As a
ADDITIONAL APPLICATION CIRCUITS: continued
result, the Schottky D2 is forward biased and
conducts the inductor current to the output. Now
the inductor experiences a reversed voltage equal
to Vout and its current ramps down linearly. As
expressed in the
Operation
section under
In-
ductor Over-Current Protection
, a minimum
T
OFF
timer is activated after the over-current
comparator is triggered in the previous state.
Before Toff expires, the internal PMOS will not
turn on, and the inductor will not be recharged
even when the output voltage drops below the
regulation voltage. This reduces the maximum
load current that can be delivered by this circuit.
Since T
OFF
is reverse proportional to the V
OUT
pin voltage, the V
OUT
pin is pulled up using a
voltage divider tying to the input voltage. As a
result, a 5V to 12V conversion can provide
maximum 120mA load. This buck-boost circuit
can regulate an output voltage higher, lower or
equal to the input voltage.
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|---|---|
| SP6650EB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP6650EU | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP6650EU/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Efficiency 600mA Synchronous Buck Regulator Ideal for portable designs powered with Li Ion battery |
| SP6650EU-L | 功能描述:DC/DC 開關(guān)控制器 High Eff 600mA Synchronous RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| SP6650EU-L/TR | 功能描述:DC/DC 開關(guān)控制器 High Eff 600mA Synchronous RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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