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參數(shù)資料
| 型號(hào)： | TPS61091RSA |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | SYNCHRONOUS BOOST CONVERTER WITH 2A SWITCH |
| 中文描述： | 同步升壓轉(zhuǎn)換器具有2A開關(guān) |
| 文件頁數(shù)： | 15/19頁 |
| 文件大小： | 457K |
| 代理商： | TPS61091RSA |
www.ti.com
SW
C1
10
μ
F
L1
6.8
μ
H
R1
R2
VBAT
VOUT
R5
C2
2.2
μ
F
C3
100
μ
F
LBO
PGND
LBI
SYNC
EN
GND
TPS61092
List of Components:
U1 = TPS6109xRSA
L1 = Sumida CDRH103R-6R8
C1, C2, C5, C6 = X7R,X5R Ceramic
C3 = Low ESR Tantalum
DS1 = BAT54S
LBO
C5
0.1
μ
F
DS1
C6
1
μ
F
V
CC2
-5 V
Unregulated
Auxiliary Output
Battery
Input
FB
V
CC1
5 V
Boost Main Output
DETAILED DESCRIPTION
Synchronous Rectifier
The device integrates an N-channel and a P-channel MOSFET transistor to realize a synchronous rectifier.
Because the commonly used discrete Schottky rectifier is replaced with a low RDS(ON) PMOS switch, the power
conversion efficiency reaches 96%. To avoid ground shift due to the high currents in the NMOS switch, two
separate ground pins are used. The reference for all control functions is the GND pin. The source of the NMOS
switch is connected to PGND. Both grounds must be connected on the PCB at only one point close to the GND
pin. A special circuit is applied to disconnect the load from the input during shutdown of the converter. In
conventional synchronous rectifier circuits, the backgate diode of the high-side PMOS is forward biased in
shutdown and allows current flowing from the battery to the output. This device however uses a special circuit
which takes the cathode of the backgate diode of the high-side PMOS and disconnects it from the source when
the regulator is not enabled (EN = low).
Controller Circuit
The controller circuit of the device is based on a fixed frequency multiple feedforward controller topology. Input
voltage, output voltage, and voltage drop on the NMOS switch are monitored and forwarded to the regulator. So
changes in the operating conditions of the converter directly affect the duty cycle and must not take the indirect
and slow way through the control loop and the error amplifier. The control loop, determined by the error amplifier,
only has to handle small signal errors. The input for it is the feedback voltage on the FB pin or, at fixed output
voltage versions, the voltage on the internal resistor divider. It is compared with the internal reference voltage to
generate an accurate and stable output voltage.
TPS61090
TPS61091, TPS61092
SLVS484A–JUNE 2003–REVISED APRIL 2004
Application Information (continued)
Figure 21. Power Supply Solution With Auxiliary Negative Output Voltage
The benefit of this feature for the system design engineer is that the battery is not depleted during shutdown of
the converter. No additional components have to be added to the design to make sure that the battery is
disconnected from the output of the converter.
The peak current of the NMOS switch is also sensed to limit the maximum current flowing through the switch and
the inductor. The typical peak current limit is set to 2200 mA.
An internal temperature sensor prevents the device from getting overheated in case of excessive power
dissipation.
15
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS61091RSAR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3.3-V Output 500-mA Boost Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS61091RSARG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3.3-V Output 500-mA Boost Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS61092 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SYNCHRONOUS BOOST CONVERTER WITH 2A SWITCH |
| TPS61092RSA | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SYNCHRONOUS BOOST CONVERTER WITH 2A SWITCH |
| TPS61092RSAR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5-V Output 96% Eff Boost Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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