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参数资料
| 型号： | TPS51513RHB |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC32 |
| 封装： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 5/38页 |
| 文件大小： | 1159K |
| 代理商： | TPS51513RHB |
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(
)
CS
CSINT
OUT
DROOP
M droop
R
A
I
V
R
G
=
DROOP
L L
OUT
V
R
I
-
= -
UDG-09079
+
11 V
–
12 V
L
–
1 V
+
1 V
C
Q1 on
Q2 on
Q1
Q2
L
V
I
t
L
D
=
D
www.ti.com
SLUS956A – JUNE 2009 – REVISED FEBRUARY 2010
Droop or No-Droop Compensation
The TPS51513 can be designed to either provide a linear load line (also known as droop) or operate with a flat
load-line (no-droop). This is achieved by the component topology at the DROOP pin.
Droop is obtained by putting a resistor from DROOP to VREF (RDROOP) to limit the gain of the error amplifier. The
equation for droop is shown in Equation 2.
where
RCS is the effective current sense resistance, whether a sense resistor or inductor DCR is used
ACSINT is the gain of the current sense amplifier
IOUT is the output current,
GMDROOP is the GM of the droop amplifier.
(2)
The load-line is defined by the change in output voltage vs. the change in current.
(3)
The TPS51513 also has the ability to provide an output without a load line. In this case, referring to Figure 2, R2
is left open, and R1 and C2 are populated to break the DC path between DROOP and REF and providing very
high DC loop gain. Means to select R1 and C2 are given in the Design Procedure section.
Overshoot Reduction (OSR) Feature
The problem of overshoot in low duty-cycle synchronous buck converters is well known, and results from the
output inductor having a small voltage (VCORE) with which to respond to a transient load release.
In Figure 5, with ideal components and the common values of 12-V input and 1-V output, the inductor voltage
(VL) with the upper FET on is 11 V (12V – 1V). With the lower FET on, the inductor voltage is only 1 V.
Figure 5. Representative Schematic of a Synchronous Converter
Because
, the converter can respond much more quickly to a load step than it can to a load release.
The idea of OSR is to turn off the lower FET during a transient load release to force the inductor current through
the body diode of the lower FET, thus increasing the voltage across the inductor to VCORE + VDIODE. This
discharges the inductor more quickly and reduces the peak voltage of the transient overshoot. As a result, less
output capacitance is required to achieve a given output tolerance specification.
Copyright 2009–2010, Texas Instruments Incorporated
13
Product Folder Link(s) :TPS51513
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS51513RHBR | 功能描述:DC/DC 开关控制器 3-28V Input Sync. Step Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS51513RHBT | 功能描述:DC/DC 开关控制器 3-28V Input Sync. Step Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS51513RHBT | 制造商:Texas Instruments 功能描述:Controller IC |
| TPS51518RUKR | 功能描述:DC/DC 开关控制器 Sgl Phase DCAP & D-CAP2 Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS51518RUKT | 功能描述:DC/DC 开关控制器 Sgl Phase DCAP & D-CAP2 Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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