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| 型号： | TPS40021PWPG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.01 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 35/36页 |
| 文件大小： | 724K |
| 代理商： | TPS40021PWPG4 |
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TPS40020
TPS40021
SLUS535D MARCH 2003 REVISED JULY 2007
www.ti.com
8
APPLICATION INFORMATION
Bootstrap/Charge Pump
The TPS4002X series includes a charge pump to boost the drive voltage to the power MOSFET’s to higher
levels when the input supply is low. A capacitor connected from PVDD to PGND is the storage cap for the pump.
A capacitor connected from SW to BOOT2 gets charged every switching cycle while LDRV is high and its charge
is dumped on the PVDD capacitor when HDRV goes high. An internal switch disables the charge pump when
the voltage on PVDD reaches approximately 4.8 V and enables pumping when PVDD falls to approximately
4.6 V. The high-side driver uses the capacitor from SW to BOOT1 as its power supply. When SW is low, this
capacitor charges from the PVDD capacitor. When the SW pin goes high, this capacitor provides above-rail
drive for the high-side N-channel FET.
PVDD, BOOT1 and BOOT2 are pre-charged to the VDD voltage during a shutdown condition. For low-input
voltage converters, utilizing higher gate threshold voltage MOSFETs, it may be necessary to add an Schottky
diode from VDD (anode) to BOOT1 to guarantee sufficient voltage for initial start up. Once switching starts the
charge pump reverses bias on the Schottky diode.
When operating the TPS40020 under no load or extremely light-load conditions the controller will be operating
in discontinuous Mode (DCM); reverse current is prevented from flowing in the synchronous rectifier. In DCM
the on times for both the HDRV and LDRV pulses can become too narrow to provide adequate charging of
PVDD and BOOT1 outputs, causing their voltages to collapse. Insufficient PVDD and BOOT1 voltages prevent
the external MOSFETS from becomming fully enhanced, causing loss of converter output regulation. Schottky
diodes from VIN (anode) to PVDD, and VIN (anode) to BOOT1, as well as a pre-load can be added to maintain
PVDD and BOOT1 at voltage levels sufficient enough to fully enhance the external MOSFETs. The amount of
pre-load typically ranges from 50 mA to 100 mA depending on operating conditions and external MOSFET
selection.
Drivers
The HDRV and LDRV MOSFET drivers are capable of driving gate-to-source voltages up to 5.0 V. Using
appropriate MOSFETs, a 25-A converter can be achieved. The LDRV driver switches between VDD and
ground, while the HDRV driver is referenced to SW and switches between BOOT1 and SW. The maximum
voltage between BOOT1 and SW is 5.0 V when PVDD is in regulation.
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相关代理商/技术参数 |
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| TPS40021PWPR | 功能描述:DC/DC 开关控制器 Low Input Sync Buck Cntrlr source/sink 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 |
| TPS40021PWPRG4 | 功能描述:DC/DC 开关控制器 Low Input Sync Buck Cntrlr source/sink 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 |
| TPS40022PWP | 制造商:Texas Instruments 功能描述: |
| TPS40040 | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW PIN COUNT, LOW VIN (2.5 V TO 5.5 V) SYNCHRONOUS BUCK DC-TO-DC CONTROLLER WITH ENABLE |
| TPS40040DRBR | 功能描述:DC/DC 开关控制器 Lo Vin Synch Buck DC/DC 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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