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| 型号： | TPS61097-18DBVT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.475 A BATTERY CHARGE CONTROLLER, PDSO5 |
| 封装： | 2.80 X 2.90 MM, PLASTIC, SOT-23, 5 PIN |
| 文件页数： | 8/26页 |
| 文件大小： | 0K |
| 代理商： | TPS61097-18DBVT |
I
L
t
200mA
(typ.)
ContinuousCurrentOperation
DiscontinuousCurrentOperation
200mA
(typ.)
TPS61097
SLVS872B – JUNE 2009 – REVISED DECEMBER 2009
www.ti.com
DETAILED DESCRIPTION
Operation
The TPS61097 is a high performance, high efficient family of switching boost converters. To achieve high
efficiency the power stage is realized as a synchronous boost topology. For the power switching two actively
controlled low RDSon power MOSFETs are implemented.
Controller Circuit
The device is controlled by a hysteretic current mode controller. This controller regulates the output voltage by
keeping the inductor ripple current constant in the range of 200 mA and adjusting the offset of this inductor
current depending on the output load. If the required average input current is lower than the average inductor
current defined by this constant ripple the inductor current goes discontinuous to keep the efficiency high at low
load conditions.
Figure 17. Hysteretic Current Operation
The output voltage VOUT is monitored via the feedback network which is connected to the voltage error amplifier.
To regulate the output voltage, the voltage error amplifier compares this feedback voltage to the internal voltage
reference and adjusts the required offset of the inductor current accordingly. For fixed output voltage versions,
the feedback function is connected internally. A resistive divider network is required to set the output voltage with
the adjustable option.
The self oscillating hysteretic current mode architecture is inherently stable and allows fast response to load
variations. It also allows using inductors and capacitors over a wide value range.
Device Enable and Shutdown Mode
The device is enabled when EN is set high and shut down when EN is low. During shutdown, the converter stops
switching and all internal control circuitry is turned off.
Bypass Switch
The TPS61097 contains a P-channel MOSFET (Bypass Switch) in parallel with the synchronous rectifying
MOSFET. When the IC is enabled (EN = VIH), the Bypass Switch is turned off to allow the IC to work as a
standard boost converter. When the IC is disabled (EN = VIL) the Bypass Switch is turned on to provide a direct,
low impedance connection from the input voltage (at the L pin) to the load (VOUT). The Bypass Switch is not
impacted by Undervoltage lockout, Overvoltage or Thermal shutdown.
Startup
After the EN pin is tied high, the device starts to operate. If the input voltage is not high enough to supply the
control circuit properly a startup oscillator starts to operate the switches. During this phase the switching
frequency is controlled by the oscillator and the maximum switch current is limited. As soon as the device has
built up the output voltage to about 1.8 V, high enough for supplying the control circuit, the device switches to its
normal hysteretic current mode operation. The startup time depends on input voltage and load current.
Operation at Output Overload
If in normal boost operation the inductor current reaches the internal switch current limit threshold the main
switch is turned off to stop further increase of the input current.
In this case the output voltage will decrease since the device can not provide sufficient power to maintain the set
output voltage.
16
Copyright 2009, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS61097-18DRSR | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW INPUT VOLTAGE SYNCHRONOUS BOOST CONVERTER WITH LOW QUIESCENT CURRENT |
| TPS61097-27DBVR | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW INPUT VOLTAGE SYNCHRONOUS BOOST CONVERTER WITH LOW QUIESCENT CURRENT |
| TPS61097-27DBVT | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW INPUT VOLTAGE SYNCHRONOUS BOOST CONVERTER WITH LOW QUIESCENT CURRENT |
| TPS61097-27DRSR | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW INPUT VOLTAGE SYNCHRONOUS BOOST CONVERTER WITH LOW QUIESCENT CURRENT |
| TPS61097-30DBVR | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW INPUT VOLTAGE SYNCHRONOUS BOOST CONVERTER WITH LOW QUIESCENT CURRENT |
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