- 您现在的位置：买卖IC网 > PDF目录220086 > TPS61107RGE (TEXAS INSTRUMENTS INC) 1.8 A SWITCHING REGULATOR, 800 kHz SWITCHING FREQ-MAX, PQCC24 PDF资料下载
参数资料
| 型号： | TPS61107RGE |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.8 A SWITCHING REGULATOR, 800 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封装： | PLASTIC, QFN-24 |
| 文件页数： | 30/34页 |
| 文件大小： | 798K |
| 代理商： | TPS61107RGE |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页当前第30页第31页第32页第33页第34页
www.ti.com
DETAILED DESCRIPTION
SYNCHRONOUS RECTIFIER
CONTROLLER CIRCUIT
DEVICE ENABLE
LDO ENABLE
POWER GOOD
TPS61100, TPS61103
TPS61106, TPS61107
SLVS411B – JUNE 2002 – REVISED APRIL 2004
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 95%. 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).
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 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.
The peak current of the NMOS switch is also sensed to limit the maximum current flowing through the switch and
the inductor. The nominal peak current limit is set to 1500 mA.
An internal temperature sensor prevents the device from getting overheated in case of excessive power
dissipation.
The device is put into operation when EN is set high. It is put into a shutdown mode when EN is set to GND. It
also can be enabled with a low signal on ENPB. This forces the converter to start up as long as the low signal is
applied. During this time EN must be set high to prevent the converter from going down into shutdown mode
again. If EN is high, a negative signal on ENPB is ignored.
In shutdown mode, the regulator stops switching, all internal control circuitry including the low-battery comparator
is switched off, and the load is isolated from the input (as described in the synchronous rectifier section). This
also means that the output voltage can drop below the input voltage during shutdown. During start-up of the
converter, the duty cycle and the peak current are limited in order to avoid high peak currents drawn from the
battery.
An undervoltage lockout function prevents device start-up if the supply voltage on VBAT is lower than
approximately 0.7 V. When in operation and the battery is being discharged, the device automatically enters the
shutdown mode if the voltage on VBAT drops below approximately 0.7 V. This undervoltage lockout function is
implemented in order to prevent the malfunctioning of the converter.
When the voltage is applied at VBAT, the LDO can be separately enabled and disabled by using the LDOEN pin
in the same way as the EN pin at the dc/dc converter stage described above.
The PGOOD pin stays high impedance when the dc/dc converter delivers an output voltage within a defined
voltage window. So it can be used to enable the converter after pushbutton start-up, or to enable any connected
circuitry such as cascaded converters (LDO) or processor circuits.
5
相关PDF资料 |
PDF描述 |
|---|---|
| TC647BEPA | BRUSHLESS DC MOTOR CONTROLLER, PDIP8 |
| TC54VC1601EZB | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBCY3 |
| TLVH431AQDBZR | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 1.24 V, PDSO3 |
| TPS62050DGSG4 | 1.4 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| TLVH431QDBZRG4 | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 1.24 V, PDSO3 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS61107RGER | 功能描述:直流/直流开关调节器 3.3V Boost Cnvrtr w/1.8V 120mA LDO RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS61107RGERG4 | 功能描述:直流/直流开关调节器 3.3V Boost Cnvrtr w/1.8V 120mA LDO RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS61120 | 制造商:TI 制造商全称:Texas Instruments 功能描述:SYNCHRONOUS BOOST CONVERTER WITH 1.1A SWITCH AND INTEGRATED LDO |
| TPS61120EVM-205 | 功能描述:电源管理IC开发工具 TPS61120-205 Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS61120PW | 功能描述:直流/直流开关调节器 Adj Hi-Eff Boost Cnvrtr w/200mA LDO RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
发布紧急采购，3分钟左右您将得到回复。